Potting electronics for a hot environment is straightforward until you add vibration. Then the encapsulant has to protect the circuit from heat and moisture while also absorbing mechanical energy that would otherwise crack solder joints and lead wires. Incure Epo-Weld™ HTE-5355 is formulated for that combination. What HTE-5355 is Epo-Weld™ HTE-5355 is a two-component epoxy for bonding, potting, and encapsulation in applications exposed to severe shock and vibration at elevated temperature. The cured matrix has enough compliance to damp vibration and absorb impact while holding properties across roughly -65°C to 205°C (-85°F to 400°F). It resists a wide range of chemicals and is compliant with NASA low-outgassing requirements, so it can be used in vacuum and space hardware. Key properties and what they mean Vibration and shock resistance. A compliant encapsulant moves with the assembly, keeping cyclic strain out of solder joints, wire bonds, and component leads. This is the main cause of field failure in potted electronics that vibrate. Wide temperature range. Properties hold from cold-soak startup to a 205°C ceiling, matching equipment that cycles hard between extremes. Low outgassing. Qualified against total mass loss and volatile condensable material limits, so it will not contaminate optics or sensors in vacuum service. Environmental protection. As a potting compound it also seals the electronics against moisture, dust, and chemical exposure. Where HTE-5355 fits Aerospace and defense: potting avionics, power supplies, and sensor modules exposed to launch and flight vibration. Automotive and transportation: encapsulating engine-bay and drivetrain electronics subject to continuous vibration and heat. Rail and transit systems: potting traction, braking, and control electronics that see shock loading. Industrial machinery: protecting sensor and control modules mounted on vibrating equipment. Downhole and field instrumentation: encapsulating electronics that must survive impact and high ambient temperature. Potting practice Pour in thin passes. A deep single pour traps air and, in a large mass, can exotherm enough to stress the components. Build the fill up in layers, letting each release its air. Degas the mix where the application is sensitive to voids, or pour under gentle vacuum. Control the cure ramp. Step the temperature up gradually so volatiles escape before the surface skins over. Plan for expansion. The potting compound, the board, and the components all expand at different rates. A compliant compound absorbs most of that, but keep pour geometries reasonable and avoid sharp internal corners that concentrate stress. See how CTE mismatch causes adhesive bond failure for the underlying mechanism. If you are potting a module with a known vibration spectrum, Email Us with the profile and the cavity dimensions. Surface preparation, mixing, and cure Clean the board and housing to remove flux residue, oils, and dust; contamination under the potting compound becomes a delamination site. Meter the two parts at the specified ratio and mix until completely uniform. HTE-5355 reaches handling strength at room temperature and develops full properties and its low-outgassing behavior with an elevated-temperature cure; a typical schedule is a room-temperature set followed by a heat cure of a few hours…

Maintenance and repair work rarely happens in a clean lab. It happens on a warm machine, with limited fixturing, and a narrow window before the equipment has to run again. Incure Epo-Weld™ HTE-5352 is a high-temperature epoxy built for those conditions. What HTE-5352 is Epo-Weld™ HTE-5352 is a two-component epoxy formulated for maintenance, repair, and overhaul (MRO) on equipment that operates hot. It holds properties across roughly -65°C to 205°C (-85°F to 400°F), resists a wide range of solvents, fuels, and dilute acids and bases, and bonds effectively to metals, glass, and ceramics. It uses a simple mix ratio and straightforward application, which matters when the work is done by hand in the field rather than on a metered production line. Key properties and what they mean Strength retained at temperature. A repair on a hot component is only useful if the adhesive holds at the operating temperature, not just at room temperature. HTE-5352 is engineered to keep a large fraction of its strength through sustained heat. Chemical resistance. Repairs on pumps, manifolds, and process equipment are exposed to the fluids that machine handles. The cured matrix resists those chemicals over long exposure. Broad substrate coverage. One material handles cast iron housings, steel brackets, ceramic insulators, and glass sight windows. Simple mixing and application. An easy ratio and a forgiving working time reduce the chance of a field error that turns a quick repair into a failure. Where HTE-5352 fits Industrial equipment and machinery: rebuilding worn or cracked housings, bonding replacement wear parts, and sealing cracked castings on hot equipment. Automotive and transportation: repairing exhaust-adjacent brackets, manifold hardware, and sensor mounts. Marine and offshore: field repairs on hot equipment where welding is impractical or unsafe. Power generation: bonding and sealing sensor housings and support hardware on boilers, turbines, and heat exchangers. Construction and infrastructure: repairs on process piping and equipment exposed to elevated temperatures. Doing the repair properly The most common reason a field repair fails is surface preparation. Clean the area with a solvent to remove oil and process residue, then abrade aggressively to remove oxide, corrosion, and old coating and to expose fresh material. Wipe again with a clean solvent and let it dry fully. On a hot component, let the surface cool to a safe application temperature and check the datasheet for the maximum substrate temperature at application. Keep the bond line as thin as the fit allows, design the repair so the adhesive is loaded in shear or compression, and where possible add a mechanical feature such as a strap, pin, or wrap so the adhesive is not the only thing carrying the load. When bonding dissimilar materials, plan for expansion mismatch as explained in how CTE mismatch causes adhesive bond failure. If you are facing a specific repair and are not sure whether a bonded fix will hold, Email Us with photos, the load case, and the temperature. Mixing and cure Meter the two parts at the specified ratio and mix until the color is…

When a component both runs hot and needs to shed heat into a sink, the adhesive at the interface has to do two jobs: hold the joint at temperature and conduct heat across it. Incure Epo-Weld™ HTE-5350 is a high-temperature epoxy formulated for that combination. What HTE-5350 is Epo-Weld™ HTE-5350 is a two-part epoxy for bonding and potting in thermal-management applications that also see high ambient or operating temperatures. The cured matrix conducts heat better than an unfilled epoxy while holding structural properties across roughly -65°C to 205°C (-85°F to 400°F). It bonds well to metals, ceramics, and many plastics, and it resists a wide range of solvents, fuels, and dilute acids and bases. Key properties and what they mean Heat transfer across the bond line. The thermal resistance of a joint is the adhesive's conductivity divided by its thickness, times the area. A thin, void-free layer of HTE-5350 moves heat from a component into a sink far more effectively than an air gap or a plain adhesive. Structural strength at temperature. Unlike a thermal grease or gap filler, HTE-5350 mechanically fixes the component and keeps holding it at 205°C. Broad substrate coverage. Metal, ceramic, and plastic joints can use the same qualified material. Chemical resistance. The cured matrix stands up to coolants, cleaning chemistry, and process fluids. Where HTE-5350 fits Power electronics: bonding heat sinks and spreaders to devices that dissipate significant heat while running hot. LED lighting: attaching LED boards and modules in fixtures that operate near their thermal limits. Automotive and aerospace: heat-coupling control modules and sensors exposed to high under-hood or bay temperatures. Industrial power conversion: potting and bonding rectifiers and drives in warm enclosures. Furnace and oven instrumentation: bonding sensor packages that must shed self-heating inside a hot enclosure. Building the thermal joint Keep the bond line thin. Use only enough adhesive to wet both faces and fill the gap. Excess adhesive in a thick layer adds thermal resistance. Eliminate voids. An air pocket is a local hot spot and a weak point. Apply in a pattern that pushes air out as the parts close. Flatten and clean the mating faces so the whole area carries heat, not just the high spots. Plan for expansion mismatch. A rigid joint between a semiconductor or ceramic and a metal sink is stressed on every thermal cycle. Reducing bond area and controlling the gap spreads that load, a mechanism explained in how CTE mismatch causes adhesive bond failure. For help estimating the thermal resistance of a proposed joint, Email Us with the component footprint, power dissipation, and sink details. Surface preparation, mixing, and cure Degrease all substrates, abrade metals to fresh material, and wipe clean. On plastics, confirm the polymer is compatible and clean without leaving a residue. Meter the two parts at the specified ratio and mix until completely uniform, extending the mix time because filler hides streaking. HTE-5350 develops full temperature resistance through an elevated-temperature cure; follow the recommended ramp and hold, since an incomplete cure…

In vacuum systems and precision optics, a bonded joint can fail in a way that leaves the adhesive perfectly intact: volatile material bleeds off the curing epoxy and condenses on a cold mirror or sensor. Incure Epo-Weld™ HTE-5351 is a high-temperature epoxy formulated to keep that from happening. What HTE-5351 is Epo-Weld™ HTE-5351 is a two-component epoxy for structural bonding and potting in demanding environments. It holds properties across roughly -65°C to 205°C (-85°F to 400°F), resists a wide range of chemicals, and delivers strong mechanical performance. Its defining feature is compliance with NASA low-outgassing requirements, which makes it usable in vacuum chambers, space hardware, and optical assemblies where outgassed contamination would degrade performance. The formulation also wets and bonds technical substrates well, including metals and optical materials such as glass and sapphire windows, when they are properly prepared. Key properties and what they mean Low outgassing. In vacuum, a standard adhesive can release volatiles that condense on nearby cold surfaces, fogging optics and coating sensors. A low-outgassing grade is qualified against total mass loss and collected volatile condensable material limits. Wide temperature range. Properties hold from cold-soak conditions to a 205°C ceiling, covering the thermal swings seen in orbit and in vacuum process equipment. Chemical resistance. The cured matrix resists solvents, fuels, and dilute acids and bases. Strong mechanical bond. HTE-5351 provides the shear and tensile strength needed for structural mounts, not just sealing. Where HTE-5351 fits Aerospace and defense: bonding structural brackets, optical benches, and sensor mounts on spacecraft and high-altitude platforms. Vacuum process equipment: bonding and potting components inside deposition, etch, and analytical chambers. Optical instrumentation: mounting windows, prisms, and filters where alignment must hold through temperature drift and outgassing must be controlled. Semiconductor manufacturing equipment: securing components in tools that operate under vacuum. Scientific instruments: bonding elements in spectrometers and detectors sensitive to surface contamination. Bonding optical and dissimilar materials Glass and sapphire are smooth, low-porosity surfaces, so mechanical keying is minimal and surface cleanliness carries the bond. Solvent-clean thoroughly and, where the joint will see moisture or thermal cycling, use a primer. When an optic is bonded into a metal cell, the expansion mismatch loads the joint at every temperature change and can distort the optic. Keep bond areas small and symmetric, control the bond line, and load the adhesive in shear. This is the same mechanism explained in how CTE mismatch causes adhesive bond failure. If you are bonding an optic where wavefront distortion is a concern, Email Us with the mount geometry and temperature range. Surface preparation, mixing, and cure Degrease metals, abrade to fresh material, and wipe again before bonding. Clean optical surfaces with a lint-free wipe and a clean solvent. Meter the two parts at the specified ratio and mix until completely uniform, then let the mix de-air briefly before applying. HTE-5351 develops its full properties and its low-outgassing behavior through an elevated-temperature cure; follow the recommended ramp and hold, and add a vacuum bake-out afterward if the application requires it.…

A structural epoxy resin is only as good as its weakest loading mode. Many fail in peel or under impact long before they reach their rated shear strength. Incure Epo-Weld™ HTE-6491 is a toughened two-part epoxy resin formulated to hold up across all of them. What HTE-6491 is Epo-Weld™ HTE-6491 is a two-component epoxy resin system for demanding structural bonding. It provides high peel and shear strength, strong impact and abrasion resistance, and good vibration damping, so the cured joint absorbs mechanical energy instead of transferring it into brittle substrates. It holds properties across roughly -53°C to 155°C (-55°F to 311°F), offers a choice of room-temperature or accelerated heat cure, and is RoHS compliant. The flexible cure is the practical advantage: you can bond on the bench with no oven, or run a short heat cure when the line needs faster throughput or higher ultimate strength. Key properties and what they mean Balanced strength. High shear numbers alone do not predict field performance. HTE-6491 also resists peel and cleavage, which is where most real joints fail when they flex or get pried. Impact and abrasion resistance. The cured resin survives handling knocks and surface wear that chip a hard, unmodified epoxy. Vibration damping. A slightly compliant bond line reduces fatigue cracking in equipment that runs with continuous excitation. Flexible cure. Room-temperature cure for large or heat-sensitive assemblies; accelerated cure for speed and a higher glass transition temperature. Where HTE-6491 fits Aerospace and defense: bonding structural brackets, mounts, and panels exposed to vibration and thermal cycling. Automotive and transportation: attaching sensors, trim, and structural inserts that must survive road input. Electronics and semiconductor equipment: securing subassemblies against handling and shipping shock. Industrial equipment and machinery: bonding wear plates, covers, and instrument mounts on vibrating equipment. Renewable energy hardware: joining enclosure components and mounting hardware in wind and solar systems that see wind loading and daily thermal swings. Joint design and surface preparation Aim for a bond line of about 0.1 to 0.25 mm. Too thin and the joint is starved and stress-concentrated; too thick and shear strength drops. Design the joint to load the resin in shear or compression, and add a mechanical locating feature so the bond is not the only thing resisting movement. Add a smooth adhesive fillet at the joint edge to spread peel stress. On metal, degrease, abrade to fresh material, and wipe again before bonding; on aluminum, a chemical etch or conversion coating gives the most durable bond. On glass and ceramic, a light abrasion plus a solvent wipe is enough. When bonding dissimilar materials, plan for expansion mismatch, which loads the joint at every temperature change; see how CTE mismatch causes adhesive bond failure. For a joint you are unsure about, Email Us with the substrates, load case, and temperature range. Mixing and cure Meter the two parts at the specified ratio and mix until the color and streaking are fully uniform. Off-ratio or poorly mixed resin cures soft and becomes the failure point. For…

A rigid high-temperature epoxy will hold at temperature but crack under vibration. A flexible adhesive will absorb shock but soften in heat. Incure Epo-Weld™ HTE-5354 is formulated to do both: stay flexible enough to damp vibration while holding properties to 205°C. What HTE-5354 is Epo-Weld™ HTE-5354 is a two-component epoxy for bonding and potting applications that combine heat exposure with mechanical stress. The cured matrix retains a degree of flexibility, so it absorbs shock and damps vibration instead of transmitting the full load into the substrates or cracking at the bond line. It reaches an initial cure in about 40 minutes, holds performance across roughly -51°C to 205°C (-60°F to 400°F), and resists a wide range of solvents, fuels, and dilute acids and bases. Key properties and what they mean Retained flexibility at temperature. Most epoxies that survive 205°C are hard and brittle. HTE-5354 keeps enough elongation to move with the assembly, which matters for components that both run hot and vibrate. Shock and vibration absorption. A compliant bond line reduces fatigue cracking and protects brittle parts from impact damage. 40-minute initial cure. Fast enough for reasonable throughput, slow enough to position larger assemblies before the adhesive gels. Wide temperature range. The same grade covers cold-soak startup and sustained high-temperature operation. Where HTE-5354 fits Automotive and transportation: potting sensors and bonding brackets in engine-bay and exhaust-adjacent locations that vibrate continuously. Aerospace and defense: encapsulating electronics and bonding mounts exposed to both heat and launch vibration. Industrial machinery: bonding instrumentation on hot equipment that runs with mechanical excitation. Rail and transit systems: potting and bonding traction and braking electronics subject to shock loading. Power generation: securing sensor packages near turbines and heat exchangers. Managing thermal expansion When you bond or pot dissimilar materials, the difference in expansion rates loads the joint at every temperature change. HTE-5354's flexibility helps absorb that movement, but joint design still matters: keep bond areas modest, control the bond line thickness, and load the adhesive in shear rather than cleavage. The full mechanism is covered in how CTE mismatch causes adhesive bond failure. If you are potting a module that both runs hot and vibrates, Email Us with the temperature profile and the vibration spectrum. Surface preparation, mixing, and cure Degrease every substrate with a clean solvent, abrade metals to fresh material, then wipe again and let dry. On aluminum, a chemical etch or conversion coating gives a more durable bond. Meter the two parts at the specified ratio and mix until completely uniform. Fixture the assembly through the 40-minute initial cure; a moderate heat post-cure raises the final strength and temperature resistance. For potting, pour in thin passes so trapped air can escape. The flexibility trade-off A flexible high-temperature epoxy is the right choice more often than shops expect, but it is not free. The same compliance that lets HTE-5354 absorb vibration also means a bonded joint will creep slowly under a constant heavy load at the top of its temperature range, and its short-term shear…

Some assemblies need an adhesive that also hides what is underneath: a black bond line that blocks stray light, masks a repair, or gives a finished edge a uniform look. Incure Epo-Weld™ HTE-6468 is a fast-setting black epoxy that bonds, seals, and encapsulates in one step. What HTE-6468 is Epo-Weld™ HTE-6468 is a two-component epoxy pigmented to a high-gloss black. It works as an adhesive, a sealant, and an encapsulant, and it is formulated for rapid handling with a pot life of about 3 minutes and useful strength developing within roughly 15 minutes. It resists elevated temperatures and a range of chemicals and is RoHS compliant. The black pigment is not just cosmetic. An opaque bond line blocks light leakage in optical and display assemblies, protects light-sensitive encapsulated components, and gives a consistent appearance on visible edges. Key properties and what they mean Opaque black finish. Blocks stray light in optical paths, conceals internal structure, and provides a uniform visible bond line. Fast set. Short pot life and quick strength gain suit high-throughput assembly and field repairs that cannot be clamped for hours. The trade-off is a short working window, so mix small and position parts first. Multi-function. One material bonds the joint, seals it against moisture, and encapsulates nearby components, reducing the number of qualified materials on the line. Temperature and chemical resistance. The cured epoxy holds up in warm, chemically active environments. Where HTE-6468 fits Optics and displays: bonding and sealing lens assemblies, light guides, and display bezels where light leakage must be controlled. For background on light guides, see what a light guide is in a UV spot lamp system. Electronics: encapsulating small components and sealing enclosure seams where a black finish is preferred. Automotive and transportation: bonding trim and sensor housings where the bond line is visible. Lighting: sealing black-out sections of fixtures and bonding optical components. Consumer products: joining panels and covers on assembly lines where appearance matters. Surface preparation and joint design Keep the bond line thin and even, about 0.1 to 0.25 mm, and design the joint for shear loading rather than peel. Degrease the metal, abrade it to fresh material, and wipe again before bonding. On plastics, confirm compatibility and clean without leaving a residue. On glass, use a clean solvent wipe. Bond within a few hours of preparation. When bonding dissimilar materials, plan for the stress that builds when they expand at different rates; the mechanism is covered in how CTE mismatch causes adhesive bond failure. If you need to confirm that the black pigment will not interfere with a downstream inspection or curing step, Email Us with the process details. Working with a fast-set adhesive Prepare and position all parts and fixtures before dispensing. Mix only what you can apply in about two minutes. Close the joint and set the fixture immediately. Leave the assembly undisturbed until it passes handling strength; full properties develop over the following day. Failure modes and prevention Voids or a starved joint: the mix gelled…

When a glass-to-metal joint fails, the shop rarely gets a clean postmortem — just a cracked cover glass, a delaminated sensor window, or a bracket that rattled loose. Working backward from the failure signature to the root cause saves an entire redesign cycle. Read the Failure Signature Before the Data Sheet Most engineers pull a fresh copy of the epoxy's technical data sheet after a field failure, but the data sheet describes a coupon under lab conditions, not the part in front of you. The crack path, its location relative to the bond edge, and whether cured adhesive remains on one substrate or both tell you more about the root cause than any spec table. Epo-Weld™ HTE-6481, a toughened two-part epoxy built for glass-to-metal duty, tolerates a wide range of loads — which means that when a joint bonded with it does fail, the cause is almost always one of four repeatable patterns rather than a chemistry limitation. Signature One: A Crack Running From the Bond Edge Into the Glass This is the most common failure on glass-to-metal joints and it is rarely a strength problem. Glass and metal expand at very different rates — aluminum moves roughly 2.5 times faster than glass per degree of temperature change — so every thermal cycle loads the bond edge in shear and puts the adjacent glass into tension. A bond area sized only for the static mechanical load, without margin for that thermal shear, concentrates stress at one point on the perimeter until the glass gives way. The underlying mechanism is covered in more depth in how CTE mismatch causes adhesive bond failure. The fix is to resize the bond area around the full service temperature range, not just the working load, and to dress the adhesive fillet smooth rather than leaving a sharp cured edge that acts as a crack starter. Signature Two: Clean Release From the Metal, Glass Still Coated An interfacial release confined to the metal side almost always traces to surface chemistry, not the epoxy itself. A thin oxide layer, residual machining oil, or too long a delay between abrasion and bonding leaves the metal surface unable to accept a durable bond even though the glass side looks fine. Degrease, abrade to bright base material, degrease again, and bond within a few hours; on aluminum specifically, a chemical etch or conversion coating measurably outperforms a bare abraded surface in long-term humidity exposure. Signature Three: A Joint That Stays Soft or Slightly Tacky for Days If the cured bond never reaches its expected hardness, suspect metering before you suspect the formulation. A two-part epoxy that is off-ratio, even by a small margin, can cure to a rubbery, understrength solid that still looks fully set at a glance. Pre-measured cartridge kits and a fresh static-mix nozzle on every application, with the first few pump strokes discarded before dispensing onto the part, eliminate the most common source of this defect. Signature Four: A Joint That Passes Initial Testing but Fails After…