Grease / Thermally Conductive Grease

Thermally Conductive Grease: Managing the Heat Path in Electronics Cooling

Every watt a semiconductor produces has to reach a heat sink, and the microscopic air gaps between a die and its cooler block that path. Thermally conductive grease fills those gaps, cutting thermal resistance and keeping junction temperatures inside their rated limits. What Thermally Conductive Grease Is Thermally conductive grease, also called thermal interface material or thermal paste, is a non-curing compound made from a carrier fluid such as silicone or a synthetic hydrocarbon oil loaded with conductive fillers. Common fillers include zinc oxide, aluminum oxide, boron nitride, aluminum, and, for the highest performance, silver or graphite. The filler carries heat while the fluid keeps the compound spreadable so it conforms to surface roughness and wets both mating faces. Why a Grease Instead of a Pad or Cured Adhesive Two solid surfaces machined flat still touch across only 1 to 2 percent of their apparent area. The rest is air, which conducts heat about 4,000 times worse than aluminum. Grease displaces that air with a material rated between roughly 0.5 and 5 W/mK, and premium metal-filled grades reach higher. Because grease does not cure, it allows rework, applies in a very thin bond line, and does not add mechanical stress from shrinkage. Pads are cleaner to handle but sit thicker; cured thermal adhesives bond structurally but cannot be reworked. Key Selection Parameters Thermal conductivity and thermal impedance: impedance at the real clamping pressure and bond-line thickness matters more than the headline conductivity number. Viscosity: thin enough to pump and spread into a 25 to 100 micron layer without trapping air, thick enough to resist pump-out. Electrical properties: metal-filled grease conducts electricity and can bridge nearby traces or pins, so use a non-conductive ceramic-filled grade around exposed circuitry. Operating range: confirm the compound holds its consistency across the full temperature swing, often −40°C to 150°C or higher for power electronics. Email Us with your device power, sink material, and clamping method, and our team will help match a grade. Failure Modes to Design Against Thermal grease degrades in two main ways. Pump-out occurs when repeated thermal expansion and contraction of the joint slowly squeezes grease out of the interface; a higher-viscosity grade and a controlled, even clamp load reduce it. Dry-out happens when the carrier fluid bleeds or evaporates over years at high temperature, leaving a powdery filler with poor contact. Choosing a grade with low oil bleed and a stable carrier, and keeping peak interface temperature within spec, extends service life. Differential expansion between the die, substrate, and sink also stresses the interface, which is why understanding how CTE mismatch causes bond failure is useful even for a non-bonding interface. Application Practice Clean both surfaces with isopropyl alcohol. Apply a small metered amount, either a thin center dot, a thin line, or a screen-printed pattern sized to the die. Let the clamp force spread it; do not pre-spread by hand, which introduces voids. Target the minimum bond-line thickness the flatness and pressure allow, since a thicker layer adds resistance regardless…

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May 7, 2024
Cyanoacrylate

Cyanoacrylate Adhesives: Where Instant-Bonding Chemistry Fits in Industrial Assembly

When a production line needs a bond in seconds and the parts are small, cyanoacrylate adhesives are hard to beat. These single-part instant adhesives cure on contact with trace surface moisture, making them a practical choice for high-volume assembly, rework, and fixturing. How Cyanoacrylate Cures Cyanoacrylate is an ethyl, methyl, or specialty alkyl ester that polymerizes by anionic reaction. A thin layer of adsorbed water on almost any surface neutralizes the acidic stabilizer in the resin, and the monomer chains link rapidly across the joint. Fixture strength develops in 5 to 60 seconds, and full cure follows over 24 hours as the network completes. Thin bond lines cure faster than thick ones because the reaction depends on moisture reaching the resin, which is also why very wide gaps cure slowly or not at all without an accelerator. Viscosity Grades and What They Do Water-thin (2 to 5 cP): wicks into press-fit and slip-fit joints already assembled; sets almost instantly. Medium (100 to 1,500 cP): general assembly on close-fitting parts where some working time is needed. Gel and thixotropic grades: fill gaps up to roughly 0.5 mm, stay put on vertical surfaces, and reduce blooming on porous substrates. Rubber-toughened grades: add peel and impact resistance, trading a little cure speed for durability. Strengths and Real Limits Cyanoacrylate bonds a wide range of plastics, elastomers, metals, ceramics, wood, and composites, often reaching tensile shear values of 2,000 to 3,000 psi on rigid substrates. It excels at bonding rubber and flexible plastics that resist other chemistries. The trade-offs are real: standard grades are brittle in peel and cleavage, lose strength above about 180°F, are attacked by prolonged moisture and polar solvents, and can bloom a white haze from monomer vapor. Bonds to acidic surfaces or highly plasticized vinyl may weaken over time. For sustained heat exposure, a dedicated line such as Incure Heat-Resist high-temperature cyanoacrylate (grades 311, 319, 320, 328, and 340) holds up where standard formulas soften. Email Us with your substrates and service conditions, and our team will point you to a viscosity and grade that fit. Surface Preparation and Handling Clean, dry, well-fitted surfaces give the most consistent results. Degrease with isopropyl alcohol and let it flash off. Extremely dry environments below about 30 percent relative humidity slow cure; a surface activator or accelerator restores speed and lets you bond acidic or inert surfaces such as some passivated metals and polyolefins after priming. Apply the smallest bead that covers the joint, since excess adhesive cures slower and blooms more. Store unopened bottles refrigerated and bring them to room temperature before use to avoid condensation. Accelerators, Primers, and Debonding Three companion products extend what cyanoacrylate can do. Accelerators, also called activators, are solvent-carried amines sprayed on one surface to speed cure, fixture large fillets, and cure exposed adhesive that would otherwise stay tacky; overuse can lower final strength, so apply a light coat. Primers deposit a reactive layer that lets cyanoacrylate bond polyolefins, silicone rubber, and fluoropolymers that are otherwise nearly…

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May 7, 2024
Accessories / Conformal Coatings / Eye Protection / Flood Lamps / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

Conformal Coating: Protecting Electronics for Enhanced Durability

Miniaturized electronics pack more function into less space, but tighter pitches and thinner dielectrics leave circuits more exposed to moisture, dust, and condensation. Conformal coating answers that exposure with a thin polymer film that follows every contour of the board and seals it against the operating environment. What Conformal Coating Is Conformal coating is a polymeric film, typically 25 to 250 microns thick, applied over a populated printed circuit board. Unlike a potting compound that encases the assembly in a solid block, the coating conforms closely to components, solder joints, and traces while adding almost no mass. That thin, close-fitting layer is what blocks the leakage paths that cause corrosion, dendritic growth, and current bridging between conductors. Why Manufacturers Coat Boards Moisture and humidity resistance. The film raises surface insulation resistance and slows the electrochemical migration that shorts fine-pitch parts in humid or condensing service. Contamination control. Salt, process dust, and airborne pollutants are kept off the conductors, preventing the ionic films that degrade signal integrity. Dielectric reinforcement. A coated board tolerates closer conductor spacing and higher working voltage without arc-over. Mechanical support. Coatings brace lead wires and tall components against vibration fatigue, and some grades damp resonance. Minimal size and weight penalty. Because the layer is thin, coating suits handheld and airborne hardware where a potted module would be too heavy. Coating Chemistries Acrylic: fast drying, easy to inspect, and simple to rework with solvent. Good moisture resistance; limited resistance to solvents and abrasion. Silicone: wide temperature range, excellent flexibility, and strong performance under thermal cycling and vibration. Preferred where boards run hot or see wide swings. Polyurethane: high chemical and abrasion resistance for harsh chemical and fuel-vapor environments; harder to rework. Epoxy: hard, tough, and chemically resistant, but effectively permanent once cured. UV-curable: cures in seconds under UV light, with a secondary moisture or heat mechanism to reach shadowed areas. This chemistry supports high-throughput inline coating with a small process footprint. Incure's Ultra-Illumina UV-curable conformal coatings fall into that last category. The line covers low-viscosity grades for thin, clog-free application with in-line fluorescent inspection, and higher-build grades up to roughly 500 microns that cure clear or opaque with a shadow-reaching dual-cure mechanism. Grades are selected by required film thickness, optical requirement, and whether automated fluorescence inspection is part of the line. Email Us with your board's operating environment and throughput target for a coating recommendation. Curing UV-Curable Coatings A UV coating is only as good as its cure. Under-cured film stays tacky, traps contamination, and outgasses in service. Two equipment paths are common: Flood lamps over a moving or indexed board give broad, uniform dose for batch and cell production. Our guide to matching UV LED flood lamp curing area to intensity covers sizing. Conveyor systems integrate the lamp into a line for continuous coating and cure. See matching a conveyor lamp head to line speed and part width. Shadowed regions under tall components never receive direct UV, which is why dual-cure grades exist: the secondary mechanism finishes…

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May 7, 2024
Putty

High-Temperature Putty: Repairs and Applications in Extreme Heat

When a furnace shell cracks or an exhaust joint blows out, ordinary body filler chars and falls away within minutes. High-temperature putty is built for exactly this gap: a moldable compound that cures into a rigid, heat-stable solid capable of holding a seal where organic fillers cannot survive. What Makes a Putty "High-Temperature" Standard epoxy and polyester fillers rely on organic resin backbones that soften near 120 C and decompose well below 300 C. High-temperature putties replace or heavily load that backbone with inorganic material: silicate binders, ceramic powders, metal oxides, and reinforcing fibers. The cured mass behaves more like a fired ceramic than a plastic, so it keeps compressive strength and dimensional stability through repeated heating and cooling. Practical service ratings span a wide band. General cast-iron and steel repair grades hold to roughly 1,000 C (about 1,800 F). Specialized formulations for kiln furniture, molten-metal handling, and furnace doors are rated beyond 1,200 C. Flange and joint sealants trade peak temperature for flexibility, typically topping out near 500 C but tolerating pressure and vibration better. Core Advantages Heat resistance without a flame source. The putty is applied cold and cures at room temperature or with a modest bake, then withstands service heat far above its cure temperature. Gap filling and shaping. A stiff, non-slumping paste bridges cracks, rebuilds worn edges, and fills voids on vertical and overhead surfaces. Permanent set. Once cured, the repair does not re-melt, so a single application lasts through many thermal cycles. Chemical and oxidation resistance. Inorganic binders shrug off combustion gases, mild acids, oils, and the oxidizing atmosphere inside furnaces and exhaust systems. Electrical insulation. Many ceramic-filled grades are dielectric, which lets them anchor and insulate heating elements and terminals. Where High-Temperature Putty Is Used Furnace and kiln maintenance: sealing cracked refractory, rebedding elements, patching door seals, and filling gaps around thermocouple entries. Exhaust and flue repair: closing pinholes and cracks in manifolds, downpipes, and stacks where welding access is poor or the base metal is too thin to weld. Boiler and pressure equipment: sealing minor leaks around access doors, handholes, and flanged joints on the fire side. Metal casting operations: repairing cast-iron and cast-aluminum tooling defects before machining or coating, and patching launders and ladle covers. Industrial ovens and dryers: rebuilding worn hearth sections and sealing panel joints against heat loss. Power generation: patching turbine casing insulation covers, ducting, and heat-shield hardware. For components that need a continuous protective layer rather than a localized patch, a sprayable or brushable ceramic system may fit better. Our guide to high emissive ceramic coatings by substrate and service temperature covers that alternative. Email Us with your substrate and peak operating temperature for a putty recommendation. Incure's Epo-Weld High-Temperature Putties Incure produces a range of Epo-Weld high-temperature repair putties for demanding heat environments. Grades are available for cast iron and steel repair up to roughly 1,000 C, thixotropic pastes formulated for boiler doors and molten-metal contact at still higher temperatures, water-based aluminum repair compounds for cast-aluminum parts,…

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May 6, 2024
Accessories / Eye Protection / Flood Lamps / UV Adhesives / UV Curing Equipments / UV LED Equipments / UV LED Spot Equipments

UV Adhesives: The Advantages of Fast Curing and Strong Bonds

In high-throughput assembly, the adhesive that joins parts should not slow the line. UV adhesives cure on demand in seconds under ultraviolet light, giving engineers tight process control and repeatable bond strength without long fixture times. How UV Adhesives Cure UV adhesives are single-component formulations built around light-sensitive resins, usually acrylates, urethane acrylates, or cationic epoxies. Each contains a photoinitiator that absorbs energy at a specific wavelength, typically between 365 and 405 nm, and releases free radicals or cations that start polymerization. The liquid crosslinks into a solid network within 2 to 30 seconds of exposure, depending on irradiance, film thickness, and pigment loading. Because the reaction only begins when light reaches the resin, an uncured bead can sit in a joint until the operator or robot is ready to align parts and expose the bond line. Where UV Adhesives Outperform Traditional Glues Speed and process control: cure happens in seconds, so parts move straight from dispense to handling strength. Two-part epoxies often need 30 minutes to several hours of fixturing. Consistent bond strength: lap-shear values on glass and many plastics commonly fall between 1,500 and 3,500 psi, with low part-to-part variation because there is no mixing step to introduce error. One-part simplicity: no metering, no mixing, no pot-life clock, and no mixed-material waste. Optical clarity: many grades cure water-clear with less than 2 percent shrinkage, which matters for lenses, displays, and decorative glass. Low VOC: most UV adhesives are 100 percent solids and solvent-free. Common Industrial Applications UV adhesives bond glass, many thermoplastics, coated metals, and hybrid stacks. Typical uses include electronics assembly such as wire tacking, component staking, and coil termination; optical assembly of lenses, prisms, and fiber connectors; appliance and instrument glass bonding; and general plastic assembly where a fast, clear bond is needed. For glass-to-metal joints, a dedicated line such as the Incure Uni-Weld UV Glass and Metal Bonder matches viscosity and tensile strength to the joint geometry. Email Us with your substrate pair and production volume, and our team will recommend a starting grade and cure setup. Design Considerations and Limits UV adhesives need a light path to the bond line. At least one substrate should transmit UV, or the joint must present an exposed fillet the lamp can reach. Shadowed areas under opaque parts either stay liquid or need a secondary cure mechanism such as heat or moisture. Deep sections above roughly 3 to 5 mm can under-cure at the base because upper resin absorbs the light first, so thick pots may require staged exposure. Oxygen inhibition can leave a tacky surface layer on thin films; an inert blanket or a higher dose resolves it. Substrate choice also drives grade selection. Low-surface-energy plastics such as polyethylene and polypropylene resist adhesion without surface treatment. Materials with large differences in thermal expansion can stress a rigid bond line during thermal cycling. A more flexible grade helps, and understanding how CTE mismatch causes adhesive bond failure helps prevent long-term interfacial cracking. Matching the Lamp to the Adhesive…

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May 6, 2024
Dispensing Needles

Dispensing Needles: Advantages for Precision Application

Precision fluid dispensing starts with the right needle. The gauge, length, and material of a dispensing needle determine whether a bead lands where it should or drifts across a finished assembly. This guide explains how to match a needle to the fluid and the process. What a Dispensing Needle Does A dispensing needle is a fine-bore tip that threads or slips onto a fluid reservoir, cartridge, or automated valve. It shapes the flow path for adhesives, sealants, lubricants, fluxes, and encapsulants, converting reservoir pressure into a controlled deposit. Because the internal diameter sets shear rate and back pressure, the needle is a process variable, not an accessory. Many industrial needles follow the ISO 594 taper standard for locking or slip fittings, which keeps them interchangeable across dispensing equipment from different suppliers. Advantages Over an Open Nozzle Repeatable deposit size. A fixed inner diameter produces a consistent dot or bead diameter across thousands of cycles, which matters on production lines held to a stated tolerance. Access to tight geometry. A 1.5-inch, 25-gauge tip reaches recessed connector pins or the base of a standing component that a wide nozzle cannot approach. Lower material waste. Controlled flow and clean tip cutoff reduce stringing, drips, and the rework that follows adhesive on the wrong surface. Fluid protection. Amber and opaque needle hubs shield light-sensitive UV adhesives in the flow path until the fluid is deposited and deliberately cured. Cleaner shear behavior. Tapered polymer tips lower internal shear on filled or thixotropic pastes, so the fluid recovers viscosity on the substrate instead of slumping. Matching Gauge to Viscosity Needle bore is described by gauge: a higher number is a smaller opening. As a working starting point: Thin, water-like fluids (under 100 cP) such as wicking cyanoacrylates or low-viscosity UV resins dispense well through 27 to 32 gauge. Mid-range fluids (100 to 3,000 cP) such as many one-part UV adhesives and light oils suit 20 to 25 gauge. Pastes and filled epoxies (above 10,000 cP) need 14 to 18 gauge, and often a tapered tip to keep back pressure within the dispenser's range. Dropping one gauge size to fight a slow flow rate is usually better than raising air pressure, because higher pressure increases the pressure-decay tail that causes drooling after the shot ends. Needle Materials Stainless steel tips give the tightest diameter tolerance and survive solvent purging and abrasive filled fluids. Straight and bent-tip versions place fluid at an angle without tilting the whole dispense head. Tapered polypropylene tips have no metal bore, so they generate less shear and are the common choice for thick pastes, solder mask, and silicone. They also eliminate any risk of a metal tip scratching a coated or optical surface. PTFE-lined tips resist cyanoacrylate cure-in-place blockage and make cleanup faster on fluids that grab onto bare steel. If you are choosing an adhesive and a tip together, our guide to matching a plastic bonding adhesive to the substrate and mechanical demand covers how viscosity grade and dispensing method interact. Email…

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May 6, 2024