Epoxy / Putty

Can 2-Part Epoxy Withstand Heat?

A two-part epoxy bond that holds fine at room temperature can soften, creep, or let go entirely once it gets hot. Whether it survives depends on the formulation, the cure, and how hot the part actually gets. Some can; most cannot. How Epoxy Responds to Heat Every cured epoxy has a glass transition temperature, Tg, where it changes from a hard, glassy solid to a soft, rubbery one. Below Tg the bond carries load at full strength. As it nears Tg, stiffness falls and the bond begins to creep under sustained load. Above Tg, the epoxy still holds parts loosely together but is no longer structural. Heat resistance is really a question of where that Tg sits relative to the service temperature. What Different Epoxies Tolerate General-purpose two-part epoxies, the kind sold for household repair, typically have a Tg between 45 and 65 degrees Celsius. They handle brief warmth but lose strength above about 65 degrees and degrade with prolonged heat. Mid-range structural epoxies hold properties to roughly 120 to 150 degrees Celsius continuous. High-temperature epoxies are formulated for 175 degrees Celsius and up, with ceramic-filled compounds surviving far higher for short excursions. Incure's Epo-Weld epoxy line includes high-temperature grades built for continuous elevated-temperature service and ceramic-based products for extreme heat. What Affects Heat Tolerance Formulation. The base resin and hardener chemistry set the ceiling. Anhydride and novolac systems generally run hotter than standard amine-cured ones. Cure. This is the most common mistake. Many high-temperature epoxies only reach their rated Tg after an elevated-temperature cure or a post-cure ramp. Cured at room temperature alone, the actual Tg lands well below the datasheet number and the bond fails hot. Bondline and geometry. A rigid hot bond between materials that expand at different rates builds stress at the interface, the mechanism described in how CTE mismatch causes adhesive bond failure. Exposure type. Continuous heat is harder on an epoxy than brief spikes. Separate the two when specifying. For help matching an epoxy to a thermal profile, Email Us. Getting the Most Heat Resistance Choose the right grade. Match the epoxy's continuous rating to the real service temperature with a 20 to 30 degree margin below its Tg. Follow the full cure schedule. Include any post-cure. This step is what makes the rated temperature real. Keep the bondline thin and uniform to limit thermal stress. Avoid overheating during service. Sustained exposure above the rating degrades the polymer permanently. Signs an Epoxy Is Failing from Heat Heat damage to an epoxy bond shows up in a recognizable sequence. First the bond softens and any load on it begins to creep, so a bonded bracket sags or a fastener backs off. Next the epoxy discolors, going amber then brown as the polymer oxidizes. Then it becomes brittle and chalky, crumbling at the edges. Finally it loses adhesion and releases. Catching it at the softening stage means the grade is simply under-rated for the temperature. Discoloration and embrittlement mean the polymer has already degraded and the…

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December 4, 2024
Epoxy / Putty

High-Temperature Epoxy: A Solution for Extreme Environments

Standard epoxy is prized for strength and adhesion, but most grades start to soften somewhere between 60 and 90°C. High-temperature epoxy is engineered to hold its mechanical properties well above that, making it the material of choice where heat would defeat an ordinary bond. What Sets High-Temperature Epoxy Apart The key metric is glass transition temperature (Tg), the point at which the cured polymer shifts from a rigid glass to a soft, rubbery state. Above Tg, shear and tensile strength drop steeply. High-temperature epoxies use aromatic hardeners, specialized curing agents, and often mineral or ceramic fillers to push Tg into the 150 to 250°C range, with some formulations rated for short-term exposure much higher. Alongside raised Tg, these grades typically offer: Retained strength at temperature, not just survival of a heat spike. Low coefficient of thermal expansion, often through ceramic or silica filler, which limits dimensional drift. Oxidative and chemical stability so the polymer does not embrittle during long hot service. Where It Is Used Automotive and motorsport: bonding and sealing near exhaust manifolds, turbochargers, and engine covers where under-hood temperatures routinely exceed 120°C. Aerospace: structural bonding of composite and metal assemblies, plus sealing around bleed-air and engine nacelle components. Electronics: die attach, encapsulation, and coil bonding where resistive heating and power density raise local temperatures. For high-power resistor and heater coatings, ceramic-filled dielectric grades are common. Energy: downhole tools, geothermal equipment, and solar concentrator assemblies exposed to sustained heat. Industrial process equipment: bonding and patching on ovens, dryers, kilns, and steam systems. For external surfaces that must radiate heat or survive flame contact, high-emissive ceramic coatings selected by substrate and service temperature often pair with a high-temperature epoxy bond underneath. Cure and Post-Cure High-temperature epoxies almost always require a heat cure and a post-cure to reach full Tg. A representative schedule ramps to an initial cure temperature, holds, then steps up to the post-cure temperature for one to several hours before a slow cool-down. Curing at room temperature alone can leave the polymer 40 to 60°C short of its rated Tg and dramatically weaker when hot. Control the ramp rate. Fast heating traps reaction exotherm in thick sections, which can char the resin or generate porosity from escaping volatiles. Not sure which grade and cure schedule your assembly needs? Email Us with your continuous and peak temperatures and substrate list. Designing the Joint Heat magnifies the effect of expansion mismatch. When a high-temperature epoxy bonds steel to aluminum, or metal to ceramic, each thermal cycle shears the bond line because the two substrates grow at different rates. A filled, lower-CTE epoxy reduces the internal stress, and joint geometry does the rest. The underlying mechanism is laid out in this explainer on how CTE mismatch causes adhesive bond failure. Practical guidance: Keep bond lines thin and uniform, 0.1 to 0.3 mm, to limit stress and voids. Favor shear-loaded lap joints over peel or cleavage. Radius sharp corners where stress concentrates. Verifying Performance Rate the epoxy on wet Tg, since absorbed…

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November 27, 2024
Epoxy / Putty

High-Temperature Resin for Carbon Fiber: A Selection Guide

Carbon fiber gives a laminate its stiffness and strength, but the resin matrix decides how hot that laminate can run before it softens. For engine bays, exhaust shrouds, motorsport bodywork, and industrial ducting, a standard laminating epoxy will sag long before the fiber is stressed. A high-temperature resin closes that gap. Why the Matrix Sets the Temperature Limit In a composite, load transfers between fibers through the resin. Once the resin passes its glass transition temperature (Tg), it changes from a rigid glass to a rubbery state, interlaminar shear strength collapses, and the part loses stiffness even though the carbon fiber itself is unharmed. So the working temperature of a carbon laminate is effectively the Tg of its matrix minus a safety margin, usually 20 to 30°C. Standard room-temperature-cure laminating epoxies land around 60 to 80°C Tg. Heat-cured structural epoxies reach 120 to 200°C. Specialty chemistries push higher still. Resin Families for Elevated Temperature Heat-cured epoxy: the practical choice for most applications up to roughly 200°C continuous. A post-cure at elevated temperature drives Tg to its full value. The Incure Epo-Weld high-temperature epoxy line, including grades in the HTE-5350 series, is formulated for this range with strong adhesion to carbon, metal inserts, and cured composite. Phenolic: excellent fire, smoke, and heat resistance, widely used in transit and aerospace interiors, but more brittle and moisture-sensitive. Bismaleimide (BMI): holds properties to about 230°C with good toughness, at higher processing complexity. Cyanate ester: strong thermal stability with low moisture pickup and good dielectric properties for radomes and electronics enclosures. Polyimide: the top of the range, stable past 300°C, but demanding to process. For coatings that must survive even higher surface temperatures than the laminate itself, high-emissive ceramic coatings matched by substrate and service temperature are a common companion. Cure and Post-Cure Discipline A high-temperature epoxy only reaches its rated Tg if it is post-cured correctly. A typical schedule ramps slowly to the manufacturer's post-cure temperature, holds for one to several hours, then cools slowly. Skipping the post-cure can leave 40 to 60°C of Tg on the table. Ramp rate matters. Heating too fast traps exotherm in thick sections and can scorch the resin or drive volatiles that leave porosity. Slow, controlled ramps produce a denser, more uniform matrix. Not sure which resin class fits your service temperature and process? Email Us with your peak and continuous temperatures and part geometry. Managing Expansion Mismatch Carbon fiber has a very low, even slightly negative, coefficient of thermal expansion along the fiber direction, while any bonded metal insert or fitting expands far more. Every heat cycle shears the bond line between them. Choosing a matrix and adhesive with enough toughness to absorb that movement is essential; the mechanism is detailed in this explainer on how CTE mismatch causes adhesive bond failure. Design fixes include tapered bond lines, compliant adhesive layers at metal-to-composite joints, and avoiding hard corners where stress concentrates. Durability in Service Beyond peak temperature, evaluate: Thermal cycling: repeated excursions fatigue the matrix and any…

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November 27, 2024
Putty

Incure Epo-Weld™ High-Temperature Repair Epoxy for Metal Joints and Castings

When a furnace is down and a cracked casting is the only thing between the plant and a restart, hot work is often impossible: the alloy will not weld cleanly, the part cannot be moved, or a spark is a hazard. A one-part ceramic repair paste lets a technician close the crack and get the equipment back into service. The case for a cold repair Welding a high-temperature casting introduces localized heat that can crack the surrounding metal, distort machined features, and demand pre- and post-weld heat treatment. Many cast irons and high-silicon alloys are effectively unweldable in the field. A ceramic-filled repair paste avoids all of that. It is applied cold, it needs no filler rod or shielding gas, and it can be worked into a crack that a welder could not reach. Incure's Epo-Weld™ high-temperature repair paste is a one-part, metal-and-ceramic filled compound rated for continuous service to roughly 1,100°C (2,000°F). It is designed to seal and rebuild cracks, gouges, and porosity in castings, manifolds, exhaust components, and heat exchanger sections across automotive, aerospace, foundry, and power-generation equipment. What you are working with The paste is single-component, so there is no ratio to measure and no risk of a mixing error under time pressure. It has a firm, trowelable consistency that stays put in an overhead crack. It bonds to steel, stainless, cast iron, and cast aluminum once the surface is properly prepared, and the cured matrix resists combustion gases, steam, and most process chemicals. Preparation is the whole job A cold repair succeeds or fails on surface preparation. Open the crack slightly with a grinder to create a V-groove that gives the paste something to key into, and drill a small stop hole at each end of the crack to keep it from running. Grit-blast or grind the surrounding area to bright, rough metal for at least 20 mm around the defect, then degrease with a fast-drying solvent and keep hands off the prepared surface. Force the first pass of paste into the bottom of the groove with a narrow tool so there are no voids, then fill in lifts of 6 mm or less, letting each skin over before the next. Finish slightly proud and blend once cured. For why a repair can still separate at the interface, see how CTE mismatch causes adhesive bond failure. Curing under real-world constraints Air-dry the repair for 24 hours. Ideally, follow with a stepped heat cure: hold near 90°C, then near 200°C, then near 350°C, giving moisture time to leave the matrix at each stage. When the equipment cannot be cured off-line, bring it up to operating temperature as slowly as the process allows on the first firing, and expect the repair to reach full strength over the first two or three thermal cycles rather than immediately. A repair rushed to full temperature while still wet is the classic failure: internal steam pressure blisters or spalls the patch. Patience on the first heat is the single most important field…

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August 10, 2024
Putty

Incure Epo-Weld™ High-Temperature Sealing Epoxy for Gaskets and Equipment

Equipment that runs between 300°C and 500°C sits in an awkward gap: too hot for elastomer gaskets, not hot enough to justify a rigid furnace-grade cement that would crack under vibration. A fiber-filled ceramic gel fills that range with a seal that stays slightly pliable. The mid-temperature sealing gap Nitrile, silicone, and fluoroelastomer gaskets top out well below 300°C. Above that, they harden, take a permanent set, and lose the recovery force that keeps a bolted joint tight. Move up to a hard, fully rigid ceramic and a new problem appears: with no give at all, the seal cracks wherever the flanges flex, breathe with pressure, or vibrate. Incure's Epo-Weld™ high-temperature sealing compound is engineered for the middle ground. It is a one-part ceramic gel reinforced with fibers, rated for continuous service to roughly 510°C (950°F). The fiber network keeps the cured seal tough and marginally flexible so it tolerates the small, repeated movements that a mid-temperature flange sees, while the ceramic matrix carries the heat and resists the chemicals that would attack an organic gasket. What the compound is The material is supplied as a thick, non-slumping gel that stays in place on vertical and overhead sealing faces. Being single-component, it needs no mixing and has no pot life once opened. It wets and lightly bonds to steel, stainless, and cast iron, and after cure it resists steam, combustion gases, oils, and dilute acids and alkalis. Typical uses Gasketing boiler doors, economizer access panels, and soot-blower ports Sealing ducting, dampers, and expansion joints on flue-gas systems Flange seals on blowers, compressors, and steam valves Oven and dryer panel joints, and heat exchanger header covers Sealing pump and gearbox covers on hot process service How to apply it Strip both faces to bare metal, removing every trace of old gasket, oil, and oxide. Run a continuous bead inside the bolt circle, sized so it stands slightly proud of the target joint gap. Assemble the joint while the gel is wet and torque the fasteners in a star pattern to the equipment specification, letting the material squeeze out to a thin, even witness line. Remove the squeeze-out before it skins over. Give the joint 24 hours to air-dry, then bring it up to temperature gradually on first firing, pausing near 100°C and near 250°C so entrained moisture leaves as vapor rather than as steam pressure inside the bead. This staged first heat is where the seal gains its final strength. For choosing a sealing or bonding material by how far the mating parts move, see how CTE mismatch causes adhesive bond failure, and for higher-temperature service compare Incure's ceramic coatings organized by substrate and service temperature. Why fiber reinforcement matters An unfilled ceramic binder is hard and brittle; it seals well until the first thermal shock or vibration event opens a crack. Chopped fiber distributed through the gel bridges microcracks as they form and blunts their growth, so the seal keeps its integrity through many more heat cycles. The trade-off is…

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August 10, 2024
Putty

Incure Epo-Weld™ Heat-Resistant Epoxy Resin for High-Temperature Metal Repair

Rebuilding a load-bearing section of a pump casing, a turbine housing, or a cast-iron manifold takes more than a surface filler. It needs a two-part, structurally reinforced compound that machines like metal and holds its strength at temperatures that destroy ordinary resins. Where a two-part system earns its place One-part ceramic pastes are convenient for sealing and thin fills, but they build strength slowly and stay comparatively brittle. A two-part, aluminum-and-ceramic reinforced compound cures by a controlled chemical reaction rather than by drying, so it develops higher compressive and shear strength, bonds more aggressively to prepared metal, and can be applied in thicker sections without shrinkage cracking. Incure's Epo-Weld™ heat-resistant repair resin is a two-part paste mixed at a 2:1 ratio. The cured compound tolerates continuous service to roughly 750°C (1,385°F) and short excursions higher. It is aimed at repairs that carry stress: worn bearing seats, eroded impeller vanes, cracked housings, and gouged sealing surfaces on automotive, aerospace, foundry, and power-generation equipment. Getting the mix right Two-part accuracy matters. Measure the resin and hardener by weight or with the supplied volumetric tools, and mix until the color is completely uniform with no streaks. Under-catalyzed material stays soft and never reaches rated temperature resistance; over-catalyzed material exotherms, cures too fast to place, and can crack. Mix only what can be applied within the stated working time, which shortens as batch size and ambient temperature rise. Scrape the mixed compound from the sides and bottom of the container into the batch at least once during mixing. Unmixed resin clinging to the container wall is a frequent source of soft spots in an otherwise sound repair. Surface preparation Machine or grind the damage back to sound metal and give the area a coarse, angular profile by grit blasting or with a carbide burr. Undercut the edges of a cavity slightly so the cured plug is mechanically keyed in place rather than relying on adhesion alone. Degrease with a clean solvent immediately before applying, and do not touch the prepared surface with bare hands. Press the first thin layer of compound hard into the profile to wet it fully, then build up to slightly above the finished contour. For a discussion of why a rebuilt area can still let go at the bond line, see how CTE mismatch causes adhesive bond failure. Cure and post-cure Allow the repair to cure at room temperature until it is hard enough to machine, typically overnight. Then post-cure with a stepped heat ramp: a hold near 100°C, a hold near 200°C, and a final hold near 350°C before the part sees full operating temperature. The stepped ramp completes the crosslink reaction and drives off volatiles gradually. A repair taken straight to service temperature without post-cure can blister or lose a significant fraction of its strength. Once post-cured, the compound can be turned, milled, drilled, and tapped with standard tooling, which is what makes it suitable for restoring dimensional features like bores and faces. Applications Rebuilding worn shaft seats,…

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August 10, 2024
Putty

Incure Epo-Weld™ High-Temperature Epoxy Gasket Seal for Extreme Heat

When a boiler door, a furnace access panel, or a molten-metal launder needs a gasket, rubber and cork are out of the question. Sealing surfaces that run above 1,000°C calls for a formed-in-place ceramic gel that stays sealed through every heat-up and cooldown cycle. The problem with conventional gaskets at high temperature Elastomeric and fiber gaskets rely on compression set: they are squeezed between two flanges and their recovery force keeps the joint tight. That mechanism collapses at high temperature. Organic binders in sheet gaskets burn out, leaving a loose ash; ceramic fiber ropes relax and shrink; and every heat cycle widens the gap as the flanges distort. The result is a joint that leaks combustion gas, radiant heat, or process fumes within a handful of cycles. Incure's Epo-Weld™ high-temperature gasket compound is a one-part ceramic gel filled with reinforcing fibers. It is applied wet directly to the sealing face, then the joint is closed so the material takes the exact shape of both surfaces. On cure it forms a dense, slightly resilient ceramic seal rated for continuous service to roughly 1,300°C (2,400°F). Because it is formed in place, it fills machining marks, minor warpage, and pitting that a cut gasket would bridge over and leak past. What the compound is The gel is thick enough to stay where it is placed on a vertical face and does not slump before the joint is assembled. It is single-component, so there is no mixing, and it bonds lightly to steel and cast iron so it stays put during assembly. Once cured it resists most process chemicals, combustion products, and mild acids and alkalis, which makes it suitable for equipment where the seal sees both heat and corrosive exposure. Where it fits Boiler and furnace doors, peep sights, and access hatches Ductwork and expansion-joint flanges on hot-gas systems Molten-metal handling equipment, launders, and ladle covers Blowers, compressors, and steam valve bonnets on high-temperature service Manifolds, heat exchangers, and oven panel joints For selecting protective materials by peak temperature and base metal, Incure's guide to ceramic coatings by substrate and service temperature is a useful companion. Application Clean both flange faces to bare metal and remove all old gasket residue, oil, and scale. Lay a continuous bead of gel inside the bolt circle, slightly proud of the final joint thickness, and close the joint immediately while the material is still wet. Torque the fasteners in a cross pattern to the equipment manufacturer's specification so the gel is compressed evenly and squeezes out to a thin, uniform line. Wipe the excess before it skins. Allow the assembly to air-dry for 24 hours. The seal then develops full ceramic strength through the first heat-up. Where possible, bring the equipment to operating temperature in stages rather than a single fast ramp, holding near 100°C and again near 250°C to let residual water escape as vapor without pressurizing the joint. A joint that is heated too quickly can bubble or crack along the bead. Thermal cycling and…

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August 10, 2024
Putty

Incure Epo-Weld™ High-Temperature Epoxy for Metal Joint and Defect Repair

A cracked exhaust manifold, a porous casting, or a leaking furnace duct cannot be repaired with a hardware-store epoxy. Conventional organic resins soften and char well before 250°C, so high-temperature metal repair needs a ceramic-based chemistry built for the heat. Why conventional epoxies fail under heat Standard bisphenol-A epoxies are held together by an organic polymer network with a glass transition temperature (Tg) that rarely exceeds 120°C without specialized hardeners. As service temperature approaches Tg, the cured resin loses stiffness, creeps under load, and begins to oxidize. Above roughly 300°C the polymer backbone breaks down entirely, leaving a friable char with almost no cohesive strength. A repair that looks sound at room temperature can fail within hours once the part returns to service. High-temperature ceramic repair compounds solve this by replacing most of the organic content with inorganic fillers and silicate binders. Incure's Epo-Weld™ high-temperature repair paste is a one-part, water-based system loaded with ceramic and stainless steel particles. The binder cures to a rigid, mineral matrix that carries load by particle-to-particle contact rather than by a temperature-sensitive polymer, which is why it holds up in continuous service to about 1,100°C (2,000°F). What the Epo-Weld™ high-temperature repair paste is The material is supplied ready to use as a trowelable paste. Because it is water-based and single-component, there is no mixing ratio to get wrong and no pot-life clock once the container is opened. It bonds to stainless steel, carbon steel, cast iron, and cast aluminum, and it can be feathered to a thin edge or built up in successive layers to rebuild missing metal. Typical uses include: Sealing cracks and pinholes in exhaust stacks, manifolds, and headers Rebuilding eroded or pitted areas on pump housings and valve bodies Patching furnace shells, incinerator liners, and ductwork Filling casting defects such as blowholes and cold shuts before machining Repairing warped or gapped flange faces on high-temperature equipment Surface preparation and application Adhesion to metal depends almost entirely on surface preparation. Grind or grit-blast the repair area to bright, angular metal, then remove all oil and dust with a fast-evaporating solvent. Any oxide scale, paint, or grease left in place becomes the weak layer where the repair eventually lets go. Work the paste firmly into the prepared surface with a stiff spatula so it wets the profile, then build to the final contour. For deep fills, apply in lifts of 6 mm or less and allow each lift to skin over before adding the next, which keeps trapped moisture from blistering the repair during cure. Overfill slightly; the material can be sanded or machined once fully hardened. For guidance on matching a coating or filler to the base metal, see how CTE mismatch causes adhesive bond failure and Incure's overview of high-emissive ceramic coatings by substrate and service temperature. Cure schedule and why the ramp matters Air-dry the repair at room temperature for 24 hours so the bulk of the water leaves the matrix. The final ceramic strength develops only after a controlled…

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August 10, 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