High Temperature Resin is the most heat-resistant Formlabs resin, 3D printed by SLA for detailed parts that work in hot air, gas and fluid. After a final oven cure, parts keep their shape at temperatures that deform standard plastics, with the fine detail and smooth surface SLA is known for. Parts are dense and watertight and handle contact with boiling water. Automotive, aerospace, tooling and appliance teams use it for under-hood and cooling-system parts, composite layup moulds, injection mould inserts and heat-resistant housings and fixtures.
How High Temperature Resin is manufactured
High Temperature Resin is manufactured using Stereolithography (SLA) on Formlabs Form 4L printers, where light cures the liquid resin layer by layer through a masked display. Parts are washed, supports are removed, and every part receives a UV cure and the Formlabs oven thermal cure. Forge Labs' controlled post-cure process applies precise UV and thermal exposure to a documented schedule, which develops the full heat resistance of the resin while preventing warpage.
Upload CAD files to Forge Labs Steam for High Temperature Resin pricing and a manufacturability review, and fix issues before production.
Upload CAD files to Forge Labs Steam for High Temperature Resin pricing and a manufacturability review, and fix issues before production.
SLA delivers the smoothest surface of any 3D printing process. Every part is washed, post-cured and has its supports removed, leaving a smooth, finely detailed surface that is ready to use straight away or to paint.
Parts are washed, post-cured and have their supports removed, leaving the smooth, finely detailed surface SLA is known for. Sharp edges, small text and fine features hold their shape, and the surface is ready for fit checks, assembly and presentation, or as a base for paint.
Painting offers a highly durable, automotive-grade coating that enhances the aesthetics and durability of 3D-printed parts. Each part is hand-finished to ensure smooth surfaces and a premium quality appearance. Using professional-grade coating equipment, this process allows for precise application and exceptional adhesion. Custom color matching is available, making it ideal for applications that require specific branding or visual impact.
High Temperature Resin keeps its shape at temperatures that deform standard plastics, and that thermal performance enables applications from injection mould tooling to aerospace wind-tunnel testing. It pairs that heat resistance with the excellent surface finish and fine feature resolution of SLA, so tooling and fixtures for high-temperature processes keep the small features and accuracy of a precision prototype.
From rapid prototyping to production runs, teams rely on High Temperature Resin to hold tight tolerances while reducing assembly complexity through consolidated part designs.
It is a rigid material with almost no flex, so mounts, housings, fixtures and mould inserts hold their geometry in heat.
Aerospace
Layup moulds that take autoclave heat, plus wind-tunnel models and hot-air test fixtures.
Automotive
Under-hood prototypes, housings and cooling-system parts, including radiator parts printed on a Form 4L.
Manufacturing Tooling
Mould inserts for prototype injection moulding runs, plus overmoulding inserts and rubber moulds.
Electronics & Energy
Masks for soldering and coating, plus moulds, fixtures and housings for electronics that run hot.
Consumer Products
Kitchen-appliance prototypes, hot-air vents and hot-fluid test parts that hold their shape through heat tests.
Aerospace
Aerospace engineers use High Temperature Resin for composite layup moulds, wind-tunnel models, sensor mounts and thermal test fixtures, and for components that sit in hot gas flow. It takes the heat and pressure of an autoclave for prepreg layup, and one aerospace and defence manufacturer prints composite layup moulds in it instead of machining Invar tools. On Forge's large-format aerospace prototyping programs, High Temperature Resin covers the hot-air and thermal test parts.
Automotive
Automotive teams use High Temperature Resin for under-hood component prototypes, hot-air ducting models, connector prototypes and heat-resistant sensor housings that must keep their functional features in engine-bay heat. A Formula Student team printed radiator parts, a pump inlet and a vortex tank on a Form 4L for a water circuit running near 80 °C, and cut each radiator's weight by 67% compared with the previous year's radiator.
Manufacturing Tooling
Product teams print High Temperature Resin mould inserts for prototype and short-run injection moulding, so a design can be shot in its production plastic before steel tooling is cut. One insert ran at least 1,500 shots of a low-viscosity polypropylene at about 230 °C, with the gate enlarged and moulding pressure kept low. The same resin makes overmoulding stand-in inserts, vulcanised rubber moulds and thermoforming tools for short runs at reduced pressure.
Electronics & Energy
Electronics teams use High Temperature Resin for protective masks that shield boards during soldering and conformal coating, and for fixtures and housings that sit near hot assembly processes. Fine SLA detail carries through to vents, pin arrays and thin walls on housings and fixtures that run hot, and to moulds for small device components. Masks print to the board outline, so each revision gets a matching mask without tooling.
Consumer Products
Appliance and consumer product teams use High Temperature Resin for kitchen-appliance prototypes, hot-air vents and housings that carry hot air or hot fluid during functional testing. Parts are dense and watertight with low absorption, so prototype coffee-maker parts handle contact with boiling water. The translucent resin lets testers see flow paths, and prototypes hold their shape through heat tests before the design moves to production tooling.
Values from the Formlabs High Temp Resin V2 datasheet, tested to the standard listed with each property; liquid resin values from the Formlabs safety data sheet.
Mechanical performance
Tensile and flexural modulus show how stiff the resin is, and elongation shows how far it stretches before it breaks. High stiffness with low elongation marks a resin that holds precise geometry rather than one that flexes or absorbs impact.
Every part receives the Formlabs oven thermal cure; the post-cured rows show Formlabs' UV-only values for comparison. The thermal cure lowers tensile strength and elongation and raises flexural stiffness slightly in exchange for its heat resistance. Low elongation and notched impact call for generous radii, and the resin is not suited to snap-fits, living hinges or parts under sustained load.
Material makeup
Density and viscosity describe the liquid resin in the vat, not the finished part; Formlabs publishes no cured-part density. A controlled wash and post-cure give every part a smooth, uniform surface, so critical features stay in tolerance and downstream finishing stays predictable.
Heat performance
Heat deflection is listed at two loads. The oven thermal cure lifts heat deflection at the lower load to the headline figure; at the higher load the gain is smaller, so size each part to the load it carries at its operating temperature.
Thermal expansion is typical of a rigid photopolymer. Allow for it where a part mates with metal across a wide temperature swing.
Compatibility data
Formlabs immersed printed, post-cured cubes in 19 fluids for 24 hours and measured size and weight gain. Fuels, mineral and hydraulic oils, salt water, alcohol and dilute acids and bases leave almost no change, while acetone causes the largest weight gain and concentrated hydrochloric acid a small size change.
Formlabs does not state an elevated test temperature, so treat the ratings as screening guidance and confirm hot-fluid exposure with application-specific testing before production release.
Compliance
Formlabs' June 2024 statement covering all its resins, including High Temp, declares RoHS compliance and no substances from the ECHA candidate list as of June 2024. Formlabs also states that every substance in High Temp Resin is on the US TSCA Active Inventory.
Formlabs publishes no biocompatibility, food-contact or flammability rating for this resin, so it is not used for food contact or where a flame-retardant material is required. For parts that must meet UL 94 V-0, Formlabs Flame Retardant Resin is the flame-retardant SLA choice.
Datasheets, design guidance and supplier documentation for High Temperature Resin.
Access the most recent datasheet and supporting documentation maintained by our engineering team.
High Temperature Resin datasheetExplore printable geometry recommendations, wall thickness tips, and finishing playbooks for SLA.
View SLA design guideSupplier declarations and test statements for this material.
High Temperature Resin is manufactured using industrial-grade Stereolithography (SLA) technology, delivering exceptional surface finish and dimensional accuracy for high-detail applications. Our calibrated resin systems and closed-loop process controls keep High Temperature Resin parts repeatable across the full build platform.
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STEP, STL, OBJ, 3MF and IGES supported
