Epoxy / UV Adhesives

High Tg Epoxy Adhesive: A Practical Guide

The glass transition temperature, Tg, is where an epoxy shifts from a hard, glassy solid to a soft, rubbery one. Above it, stiffness and shear strength drop sharply. A high Tg epoxy adhesive keeps that transition well above the service temperature, which is why it holds a bond that a standard epoxy would lose. What Tg Actually Means for a Bond Below Tg, an epoxy carries load with its full room-temperature strength. As it approaches Tg, modulus falls, creep increases, and a bond under sustained load begins to move. Cross the Tg and the adhesive still holds parts together but no longer performs structurally. The practical rule: keep the maximum continuous service temperature at least 20 to 30 degrees Celsius below the cured adhesive's Tg. If a part runs at 150 degrees, target a Tg of 175 degrees or higher. Where High Tg Epoxies Are Used Aerospace: bonding structure and components near engines and in high-altitude thermal cycling. Automotive: securing parts in engine bays and near exhaust and braking heat. Electronics: attaching heat sinks, bonding substrates, and staking components that run hot. Industrial manufacturing: joining metals, ceramics, and composites in processes that involve elevated temperature. Cure Determines Tg This is the point most often missed: a high Tg epoxy only reaches its rated Tg if it is cured correctly. Most high Tg systems need an elevated-temperature cure or a post-cure ramp. Cure it at room temperature only and the actual Tg lands far below the datasheet value, and the bond fails at a temperature it should have survived. Verify cure by measuring Tg on a sample with a simple thermal method, or at minimum by holding a bonded coupon at the service temperature under load and confirming it does not move. For help building a cure schedule your process can deliver, Email Us. Tradeoffs to Plan For Cure effort. Elevated-temperature or post-cure steps add process time and equipment. Brittleness. High Tg systems are often more rigid at room temperature, so they tolerate less peel and impact. A toughened high Tg grade recovers some of that. Thermal stress. A rigid bond between materials with different expansion rates concentrates stress at the interface, the mechanism in how CTE mismatch causes adhesive bond failure. Bondline thickness and joint design have to account for it. Selecting a Grade Define these before choosing: Maximum continuous service temperature and any short excursions. Sustained load and whether creep resistance is critical. Peel and impact demands at room temperature. Substrates and their surface condition. The cure schedule the production line can support. Incure's Epo-Weld epoxy range includes high-temperature structural grades formulated for elevated Tg. When the choice is between chemistries for a demanding structural joint, the comparison in UV glue versus epoxy for heavy-duty repairs covers the strength tradeoffs. Wet Tg and Real Service Datasheets quote a dry Tg measured on a freshly cured sample. In humid service, epoxies absorb 1 to 3 percent water by weight, and that absorbed moisture plasticizes the polymer and drops the effective…

Comments Off on High Tg Epoxy Adhesive: A Practical Guide
November 27, 2024
Electronics Adhesives

The FIPG and CIPG Solution for Fast-Paced Production: Incure Uni-Seal 6322

On a high-volume line, a sealing material that needs minutes of oven time or a long moisture cure becomes the bottleneck. Incure Uni-Seal 6322 is a light-curable form-in-place and cure-in-place gasket material designed to seal electronic and automotive housings at the pace of automated production. The Case for Light-Cured Gaskets Traditional gasketing forces a choice between slow-curing liquid sealants and the inventory and fit problems of die-cut parts. A UV, visible, or LED light-curable FIPG or CIPG material removes that trade-off. The bead is dispensed exactly where it is needed, then cured on demand in seconds as the part passes a lamp, so throughput is set by line speed rather than by chemistry. What Uni-Seal 6322 Offers Acid-free formulation that will not corrode copper, solder, or fine-pitch conductors Low viscosity for precise dispensing into narrow channels and around tight corners Fast cure with low-energy LED lamps, suited to inline and conveyorized processes High resilience and memory retention, so the gasket recovers after compression cycles better than many cut elastomers Air-tight sealing against moisture, dust, and pressure differentials Moisture, temperature, and chemical resistance for under-hood and outdoor service Dual use as a temporary mask during conformal coating Building the Process Around It Bead and groove design. Give the dispensed bead a defined cross-section and a target compression of roughly 20 to 40 percent when the housing closes. Consistent geometry is what makes the seal repeatable unit to unit. Dispensing. A positive-displacement dispense head keeps bead volume constant as the material warms or the reservoir drains. Programmed paths hold the bead centered on the flange through corners and changes in direction. Curing. Size the lamp to the largest part so the entire bead reaches full cure in one pass. For long or complex flange paths, an inline conveyor curing system or a correctly matched UV LED flood lamp keeps cure time in step with takt. A cured gasket and a metal or plastic housing expand at different rates, so a seal that is fine at room temperature can loosen in the cold or over-compress when hot. Weighing how thermal expansion mismatch stresses a sealed joint guides the choice between a firmer and a more compliant grade. For help matching Uni-Seal 6322 to a dispense cell and cure station, Email Us with your cycle-time targets and housing geometry. Production Benefits Switching to a light-cured poured gasket typically shortens cycle time, cuts gasket inventory and scrap, reduces rework by forming the seal in one controlled step, and gives engineering the freedom to revise flange geometry without new tooling. The same material can seal a control-unit housing on one line and mask a board for coating on another. Resilience and Compression Set A gasket's job is to keep sealing after it has been compressed, warmed, cooled, and vibrated for years. The property that describes this is compression set: how much permanent deformation remains after the load is removed. A material with high compression set gradually loses its sealing force and the joint starts to leak,…

1 Comment
August 21, 2024
Electronics Adhesives

The FIPG and CIPG Sealing Solution for Electronics and Automotive: Incure Uni-Seal 3393

A poured-in-place gasket only works if it seals on the first try and stays sealed through vibration, temperature swings, and chemical exposure. Cut gaskets shift, compress unevenly, and leave gaps at corners. Incure Uni-Seal 3393 is a light-curable form-in-place and cure-in-place gasket material built to seal complex geometries in electronics and automotive assemblies. Form-in-Place and Cure-in-Place Basics A form-in-place gasket (FIPG) is dispensed as a bead directly onto one mating surface, then cured before assembly so it behaves like a precision-molded seal. A cure-in-place gasket (CIPG) follows the same idea but is compressed between surfaces during cure. Both approaches eliminate gasket inventory, adapt instantly to design changes, and follow irregular flange paths that a die-cut part cannot. Why Uni-Seal 3393 Uni-Seal 3393 cures under UV, visible, or LED light and is engineered around the needs of sensitive electronics: Acid-free chemistry that will not corrode copper, solder, or fine-pitch leads Low viscosity for precise dispensing and penetration into narrow channels Tack-free cure leaving a clean, handleable surface with no residue transfer Air-tight sealing against moisture, dust, and pressure differentials Ease-of-peel rework, so a module can be opened for repair and resealed Moisture, temperature, and chemical resistance for under-hood and outdoor service Dual use as a temporary mask during downstream conformal coating Designing a Reliable Poured Gasket Bead geometry drives the seal. Specify a groove or a defined land width so the dispensed bead has a consistent cross-section and a target compression, generally 20 to 40 percent, when the housing closes. Too little compression leaks; too much extrudes material and can bottom out the joint. Dispense control is the other half. A positive-displacement dispense head holds bead volume constant as the material warms or the reservoir empties, and programmed paths keep the bead centered on the flange around tight corners. After dispensing, the assembly passes under a lamp sized to the part so the entire bead reaches full cure. Because a cured gasket and a metal or plastic housing expand at different rates, a seal that is fine at room temperature can open up in the cold or over-compress when hot. Considering how thermal expansion mismatch stresses a bonded or sealed joint guides the choice between a firmer or a more compliant gasket. Matching the material to a suitable UV LED flood lamp or an inline conveyor system keeps cure time in step with line speed. For help fitting Uni-Seal 3393 to a flange design and dispense process, Email Us with your housing drawings. Poured Gaskets Versus the Alternatives Die-cut elastomer gaskets carry a hidden cost: tooling for each new shape, inventory for each part number, scrap from the cut, and assembly labor to place them without pinching or misaligning. They also seal poorly at tight radii and sharp corners, exactly where enclosures tend to leak. A poured gasket forms to the flange path automatically and needs no part-specific tooling. Room-temperature-vulcanizing (RTV) silicone beads solve the fit problem but cure slowly from the surface inward, so a thick bead can stay soft…

1 Comment
August 21, 2024
Electronics Adhesives

Potting Compounds for Extreme Environments: Incure Uni-Seal 6213HT

Electronics that run hot, sit outdoors, or live inside a machine face a punishing mix of heat, moisture, vibration, and chemicals. A potting compound that passes a bench test can still crack or absorb water after a season in the field. Incure Uni-Seal 6213HT is built for assemblies that must keep working under those conditions. What Potting Does Potting fills the cavity around a circuit or component with a solid resin, creating a continuous barrier against the environment and a mechanical anchor against shock and vibration. Unlike a thin conformal coating, a potted section is fully encased, which raises protection but also puts the resin in intimate contact with every component. That makes two properties critical: low stress on the parts and stable behavior across temperature. Where Uni-Seal 6213HT Fits Uni-Seal 6213HT is a thick-viscosity adhesive that cures under UV, visible, or LED light, with heat as a secondary path for shadowed regions. The high viscosity keeps it in place on vertical walls and around tall components during application, and the multi-mode cure lets it set fully even where light cannot reach every surface. Key characteristics for demanding service: Deep single-pass potting to roughly 5 mm, forming a hard solid pot without repeated lifts Chemical resistance to mineral oils, fuels, gases, and common industrial solvents Low water absorption and low shrinkage, which limits dimensional change and internal stress over the service life Adhesion to metals, glass, and ceramics, so the pot stays bonded to the housing and substrate Smooth cured finish suitable for inspection and downstream handling Selecting and Applying a Potting Compound Match the resin to the environment. For high-temperature or chemically aggressive service, prioritize a low coefficient of thermal expansion, a glass transition temperature above the maximum operating temperature, and demonstrated resistance to the specific fluids present. For assemblies that dissipate significant heat, a thermally conductive grade moves that heat into the housing instead of trapping it. Process control determines whether those properties actually reach the finished part: Prepare surfaces. Clean off flux residue, oils, and mold release so the resin can wet and bond the substrate. Manage the exotherm. In deep or large-volume pots, cure in controlled steps so reaction heat does not spike and generate voids or shrinkage stress. Remove entrapped air. Vacuum degassing before or during pour prevents bubbles that concentrate stress and reduce dielectric performance. Cure completely. Confirm shadowed regions receive the secondary heat cycle, and verify hardness against the datasheet before releasing parts. Because the resin and the components expand at different rates, thermal cycling is where marginal potting jobs fail. Reviewing how expansion mismatch drives cracking and delamination helps explain why a compliant, low-shrinkage resin outlasts a harder, higher-stress one in cycling service. UV and visible-light potting resins also depend on adequate cure energy, so pairing the material with the right LED flood lamp for the curing area is part of the specification. For help evaluating Uni-Seal 6213HT against your temperature, chemical, and mechanical requirements, Email Us with your operating conditions. Thermal…

1 Comment
August 21, 2024
Epoxy

Impact-Resistant Bonding for Multi-Substrate Assemblies

A bonded assembly is only as durable as its response to a shock. Many joints that pass a static pull test still split the first time the product is dropped, slammed, or run on a vibrating machine. Impact-resistant bonding is about designing the adhesive and the joint together to survive those events. Why Standard Adhesives Fail Under Impact A rigid, highly crosslinked adhesive can have excellent static strength and almost no toughness. Under a sudden load, energy has nowhere to go, so a crack starts at a stress concentration and propagates through the bond line before the material can deform to absorb it. Vibration does the same thing over time through fatigue: millions of small cycles grow a crack that a single test never revealed. Multi-material joints make this harder. Bonding metal to plastic to ceramic to glass means each substrate has a different stiffness and a different rate of thermal expansion, so the bond line is already under stress before any external load arrives. What an Impact-Resistant Epoxy Does Differently A toughened two-part epoxy carries a dispersed flexible phase within the cured matrix. That phase blunts crack tips and lets the bond line flex slightly under a shock load instead of shattering. The trade-off is a modest reduction in peak rigidity and glass transition temperature compared with an untoughened structural epoxy, which is usually a good exchange for an assembly that has to survive handling and transport. Incure Epo-Weld™ includes two-part epoxy formulations built for impact and vibration resistance across dissimilar substrates, with these typical working characteristics: Substrate range: metals, engineering plastics, ceramics, glass, and cured rubbers Gap filling: accommodates bond lines in the 0.1 to 0.2 mm range Working time: around a 4-hour pot life for unhurried application on larger assemblies Cure: full cure in roughly 24 hours at room temperature, or about 2 hours at 65°C Designing the Joint for Shock The adhesive is half the answer. The joint geometry is the other half: Maximize bonded area so an impact load is spread thin rather than concentrated. Load the joint in shear, not peel or cleavage, wherever the layout allows. Radius internal corners and avoid abrupt changes in section that concentrate stress. Keep the bond line uniform; thick and thin patches cure and flex differently. Add a mechanical backup, such as a rivet or a snap, on joints that see the highest peak loads. Because dissimilar-material joints carry constant expansion stress, review how CTE mismatch causes adhesive bond failure during design. For guidance on where epoxy is the right chemistry for a heavy or structural joint in the first place, see UV glue versus epoxy for heavy-duty repairs. Where Impact-Resistant Bonding Matters Automotive: bonding components in engines, transmissions, and chassis that see continuous vibration and road shock Rail and transit: interior and underframe assemblies subject to coupling shock and track vibration Industrial equipment: machinery housings, guarding, and brackets exposed to impact and cyclic loading Consumer electronics: enclosures and internal structure that must survive drop testing Aerospace: secondary…

1 Comment
August 20, 2024
Cyanoacrylate

Incure Cyro-Weld™ CM-4000: High-Viscosity Cyanoacrylate Adhesive

When a joint has a large or uneven gap, or when the adhesive absolutely cannot migrate into a nearby feature, even a standard high-viscosity cyanoacrylate is not thick enough. Incure Cyro-Weld™ CM-4000 is a gel-consistency, very-high-viscosity grade for the widest-gap and highest-control joints on external and disposable devices. Gel Consistency and Why It Helps A gel cyanoacrylate does not flow at all until it is worked. It can be placed as a discrete deposit, it holds a tall fillet, and it will not creep along a seam or wick into a threaded feature, a vent, or a moving mechanism next to the joint. That makes it the grade to reach for when the consequence of stray adhesive is a scrapped assembly. CM-4000 is a single-component grade in the Cyro-Weld™ CM series, formulated to meet ISO 10993-5 for cytotoxicity, and intended for external, disposable, and wearable components rather than implanted parts. Incure Cyro-Weld™ CM-4000 at a Glance Chemistry: single-component, room-temperature-cure cyanoacrylate Viscosity: very high, gel consistency, non-migrating Fixture speed: tens of seconds to minutes; the slowest-fixturing CM grade because of bond-line thickness Bond strength: high shear strength on suitable rigid plastics Gap capability: the widest of the CM series, with an activator to drive cure Biological safety: formulated to meet ISO 10993-5 for cytotoxicity Sterilization: compatible with validated ethylene oxide and gamma processes; confirm with Incure Where CM-4000 Fits Wide or uneven gaps: joints where molded-part variation leaves the bond line inconsistent and large Fillet reinforcement: building a structural fillet at the base of a bonded post or bracket Sensitive-neighbor joints: bonding next to vents, threads, membranes, or mechanisms that must stay clean Point deposits: placing a controlled dab to lock a fastener or retain a small component Process Control for Gel Cyanoacrylate A gel this thick will not fully cure on its own through a large bond line in a reasonable time. Plan on an activator applied to one face, or a two-step approach where a thin activated skin fixtures the part and full-depth cure completes over hours. Because the deposit is a significant mass, expect a measurable exotherm and keep it away from thin, heat-sensitive plastic walls. Dispense from a tapered tip with steady pressure so deposit size is repeatable. Keep humidity between 40 and 60 percent. For a wider view of picking an adhesive against gap and load, see matching adhesive grade to viscosity and tensile requirement. Where the joint spans dissimilar materials, review how CTE mismatch causes adhesive bond failure. Storage, Shelf Life, and Handling Store unopened CM-4000 refrigerated at 2–8°C and let each bottle or applicator reach room temperature before opening so condensation does not enter the container. Reseal after every use, keep the air headspace low, and use within the opened shelf life on the label. Because the gel already sits at the high end of the viscosity range, a bottle that has thickened further should be quarantined rather than forced through a dispense tip. Rotate stock first-in-first-out, record lot numbers in the device history…

1 Comment
August 15, 2024
Cyanoacrylate

Toughened Cyanoacrylate for Drop-Resistant Housings: A Testing Protocol

A standard cyanoacrylate bond is glassy and brittle, which means a portable device housing that survives a bench inspection can still crack at the seam the first time it hits a concrete floor — toughened, rubber-modified cyanoacrylate exists specifically to close that gap. Why Unmodified Cyanoacrylate Fails Under Shock An unmodified cyanoacrylate film has almost no ability to absorb energy on impact. Under a sharp shock load, a crack initiates at the nearest stress concentration — a corner, a void, a thin spot in the bondline — and propagates through the joint with very little resistance, since the polymer network has no mechanism to blunt the advancing crack tip. Rubber-modified, or toughened, cyanoacrylate disperses elastomer domains throughout the cured polymer matrix. Those domains absorb energy and arrest crack propagation, letting the joint survive drop and vibration loads that would split an unmodified bond outright. The Real Trade-off: Static Strength vs. Retained Strength Toughening isn't free — static shear strength on a toughened grade typically runs somewhat lower than an unmodified rigid grade measured immediately after cure. What toughened chemistry actually buys is retained strength after impact and after repeated vibration cycling, which is the metric that actually predicts field survival for a handheld or portable enclosure. A rigid grade's headline shear number can look better on a datasheet while performing worse in the drop tests that matter for the real application — this is why datasheet comparison alone is an unreliable way to select between the two. Building a Drop-Test Protocol That Actually Predicts Field Performance A defensible qualification protocol starts with defining the drop height and orientation from the product's actual expected use and transport environment, not a generic industry default — a handheld field-service tool dropped from waist height onto concrete needs a different test than a benchtop instrument that only faces occasional desk-edge bumps. IEC 60068-2-31 and MIL-STD-810G both provide standardized free-fall and procedural drop-test methodologies that give a repeatable baseline, though the specific height, orientation set, and pass criteria should still be tailored to the product rather than applied as generic defaults. Email Us if you're building a drop-test spec for a housing assembly and want help matching toughened cyanoacrylate performance data to your test parameters. Test on Cured, Aged, and Environmentally Stressed Units — Not Just Fresh Ones Full mechanical properties, including peak impact resistance, typically develop over roughly 24 hours after bonding, so drop-testing a freshly assembled unit understates real performance and can produce a misleadingly pessimistic result. The more important discipline is testing units that have also been through accelerated shelf aging and any environmental exposure the product will see in service — thermal cycling, humidity, UV exposure for outdoor equipment — since both aging and environmental stress can stiffen a rubber-modified polymer and measurably reduce the energy it's able to absorb on impact. A toughened grade that passes a drop test fresh out of the mold but hasn't been aged first hasn't actually been qualified for field service. Geometry Still Governs Survival…

1 Comment
August 15, 2024
Cyanoacrylate

Biocompatible Adhesive: Incure Cyro-Weld™ CM-225 for Medical Devices

External and disposable device assemblies rarely bond one material to itself. A typical handheld instrument joins rigid plastic to foam, metal to elastomer, or a molded body to a fabric strap. A biocompatible adhesive for that work has to hold dissimilar surfaces and tolerate a bond line that is not perfectly tight. Incure Cyro-Weld™ CM-225 is a medium-viscosity grade formulated for exactly that. Why Medium Viscosity for Multi-Substrate Work Ultra-low-viscosity cyanoacrylate needs a near-perfect fit. Real dissimilar-material joints have surface texture, compliance, and small gaps that a water-thin adhesive runs straight out of. A medium-viscosity grade stays where it is placed, bridges minor gaps, and builds a fillet that adds peel resistance at an edge. CM-225 is that grade in the Cyro-Weld™ CM series: single-component, room-temperature curing, and formulated to meet ISO 10993-5 for cytotoxicity. It is intended for external, disposable, and wearable components, not implanted parts. Incure Cyro-Weld™ CM-225 at a Glance Chemistry: single-component, room-temperature-cure cyanoacrylate Viscosity: medium, for controlled placement and small gap filling Fixture speed: seconds to tens of seconds depending on substrate and humidity Bond strength: up to roughly 3,400 psi on suitable substrates Substrates: rigid plastics, foam rubbers, metals, coated fabrics, and prepared composites Biological safety: formulated to meet ISO 10993-5 for cytotoxicity Sterilization: compatible with validated ethylene oxide and gamma processes; confirm with Incure Handling Dissimilar Materials When two materials expand at different rates, the bond line carries stress every time the assembly changes temperature, even sitting in a warehouse. That is the main reason multi-material joints fail, not the working load. Design a wider bond area, keep the adhesive layer thin and uniform, and let the fillet carry edge peel. Review how CTE mismatch causes adhesive bond failure before committing the geometry, and use matching adhesive grade to viscosity and tensile requirement as a selection framework. Typical Applications Strap and enclosure joints: bonding coated fabric or foam to a molded wearable body Grip overmolds: attaching elastomer grips to rigid handheld instrument shells where a mechanical lock is absent Foam gasket placement: fixing foam seals into housing channels on portable equipment Mixed plastic-metal brackets: joining a stamped bracket to a molded boss inside a device Process Control Clean each surface with the method appropriate to that material: solvent wipe for rigid plastics and metals, light abrasion for slick surfaces, and a lint-free tack for fabrics. Dispense a controlled bead on the rigid face, mate within the open time, and hold light pressure. On porous or absorbent surfaces, the adhesive can soak in and starve the bond line, so apply slightly more and confirm coverage on a cut sample during qualification. Keep humidity between 40 and 60 percent. Storage, Shelf Life, and Handling Store unopened CM-225 refrigerated at 2–8°C and let each bottle reach room temperature before opening so condensation does not enter the container. Reseal after every use, keep headspace low, and use within the opened shelf life on the label. Rotate stock first-in-first-out and log lot numbers in the device history record. Dispense…

1 Comment
August 15, 2024
Cyanoacrylate

Incure Cyro-Weld™ CM-110: Medical Grade Cyanoacrylate Adhesive

Most disposable and external device assemblies do not need an exotic adhesive. They need one reliable, single-part grade that bonds the common plastics, cures without equipment, and comes with the biological-safety documentation the device file requires. Incure Cyro-Weld™ CM-110 is built to be that default choice. The Case for a General-Purpose Grade Specialized adhesives solve specific problems, but every extra grade on the floor adds inventory, training, and validation overhead. A low-viscosity, broad-substrate cyanoacrylate covers the majority of housing seams, connector locks, and small-part attachments in one line item. CM-110 is that grade in the Cyro-Weld™ CM series: single-component, room-temperature curing, and formulated to meet ISO 10993-5 for cytotoxicity. It is intended for external, disposable, and wearable components, not implanted parts. Incure Cyro-Weld™ CM-110 at a Glance Chemistry: single-component, room-temperature-cure cyanoacrylate Viscosity: low, for easy placement and penetration into tight joints Fixture speed: seconds to tens of seconds depending on substrate and humidity Bond strength: up to roughly 3,400 psi on suitable substrates Substrates: ABS, polycarbonate, acrylic, many filled resins, cured rubbers, and prepared metals Biological safety: formulated to meet ISO 10993-5 for cytotoxicity Sterilization: compatible with validated ethylene oxide and gamma processes; confirm with Incure Where CM-110 Fits Device housings: bonding molded enclosure halves on handheld and benchtop instruments Connector retention: locking fluid and electrical connectors against back-off on disposable sets Internal structure: attaching ribs, bosses, and brackets inside a housing Accessory assembly: joining small molded parts in kits and consumables For low-surface-energy plastics such as polypropylene, prime first. For a structured approach to matching a grade to substrate and load, see matching adhesive grade to substrate and mechanical demand. Process Control Clean parts to remove mold release and handling oils; this is the highest-leverage step for consistent bonds. Dispense a metered drop on one face, mate within the open time, and hold light even pressure until handling strength develops. Full strength builds over 24 hours. Keep shop humidity between 40 and 60 percent. Use an activator on primed polyolefins or where a small gap needs quick fill, understanding that activator slightly lowers ultimate strength. Where a housing bonds two different materials, expansion mismatch loads the joint across temperature and shipping conditions; review how CTE mismatch causes adhesive bond failure before finalizing the geometry. Keep the bond line thin and uniform, design the joint to work in shear rather than peel, and add a mechanical feature such as a snap or a boss to carry peak load so the adhesive is resisting back-off and vibration rather than the full working stress. Storage, Shelf Life, and Handling Store unopened CM-110 refrigerated at 2–8°C and warm each bottle to room temperature before opening so condensation does not enter and shorten its working life. Reseal tightly after every use, keep the air headspace low, and use within the opened shelf window on the label. Rotate stock first-in-first-out and record lot numbers in the device history record. Dispense in a ventilated station with nitrile gloves and eye protection, and keep water and activator…

1 Comment
August 15, 2024
Cyanoacrylate

Incure Cyro-Weld CM-55: Non-Blooming Medical-Grade Cyanoacrylate

Blooming, the white frosted haze that forms around a curing cyanoacrylate, is a cosmetic and functional defect that disqualifies many instant adhesives from disposable device assembly. Incure Cyro-Weld CM-55 is an ultra-low-viscosity, non-blooming grade formulated to meet ISO 10993-5, developed for bonding external device components cleanly and precisely. The Blooming Problem Standard cyanoacrylate releases a small amount of monomer vapor during cure. That vapor settles on nearby surfaces and reacts with ambient moisture to leave a fine white deposit, most visible on dark or clear parts. On a device housing, a lens window, or a printed label area, blooming looks like contamination and can interfere with optical clarity or subsequent bonding. Cyro-Weld CM-55 uses a low-volatility formulation that suppresses the monomer vapor responsible for the effect. Bonds cure clean, with no frosting on the surrounding component, which is why it suits assemblies where appearance and surface cleanliness are inspected. Key Properties Formulated to meet ISO 10993-5 for cytotoxicity, supporting use in external and disposable device-component bonding during manufacturing. Ultra-low viscosity, roughly in the wicking range, so the adhesive is drawn into pre-assembled tight-fitting joints by capillary action. Parts can be positioned first and bonded after. Bond strength up to 3,000 psi on metals and 1,300 psi on plastics with clean, dry, properly prepared surfaces. Non-blooming cure, leaving no white haze on adjacent surfaces. Chemical resistance to alcohols, petrol, aromatic hydrocarbons, and dilute acids and bases after full cure. Compatible with validated EtO and Gamma sterilization processes at the assembly level; confirm against your own process qualification. Where CM-55 Is Used CM-55 is intended for the assembly of external, non-implanted, disposable and reusable device components: Fluid-path connectors and hub fittings, where low viscosity wicks into the annular gap of a press fit Housings and enclosures for handheld and benchtop instruments, where a clean, haze-free bond line matters cosmetically Optical and sensor windows bonded into external housings, where blooming would obscure the aperture Wearable and external monitoring device components, where small parts are bonded in tight tolerances Diagnostic cartridge and consumable housings assembled at high volume CM-55 is not for implanted components or for any application involving direct long-term patient tissue contact. It is a manufacturing adhesive for device sub-assemblies. Achieving a Clean, Strong Bond Prepare surfaces. Wipe with isopropyl alcohol and allow it to flash off. Plastics with low surface energy, such as polyolefins, need a primer or surface treatment for a durable bond. Assemble, then bond. Because CM-55 wicks, position the parts in their final relationship first, then touch the adhesive to the joint edge and let capillary action carry it into the interface. This gives precise placement with no squeeze-out. Keep the gap tight. Ultra-low-viscosity cyanoacrylate performs best in gaps below about 0.1 millimeter. Wider gaps cure slowly and weakly; an accelerator helps but a tighter fit is better. Control humidity. Cyanoacrylate cures through surface moisture. Very dry rooms slow the cure; very humid rooms can skin the surface before wicking completes. A conditioned assembly area of 40 to…

1 Comment
August 15, 2024