EpoxAmite™ HT

EpoxAmite™ HT

EpoxAmite™ HT High Temperature Laminating Epoxy is a water clear, UV resistant laminating epoxy that resists high temperatures up to 300°F / 149°C when properly cured. Pot life is 1 hour and cure time is 24 hours at 73°F / 23°C (post cure required – see post cure schedule). Ultra-low viscosity ensures uniform wetting out and fast penetration of reinforcement materials during hand lay-up or vacuum infusion processes. Cured resin offers superior physical properties.

EpoxAmite™ HT High Temp Laminating Epoxy can be used with S-Glass, E-Glass, Kevlar and carbon fibers for making composite tooling or parts.  Applications include making high temperature pre-preg parts, bonding fixtures, vacuum form molds and prototype injection molds.
Use as a backup laminating resin for EpoxAcoat™ HT high temperature surface coat epoxy.


Preparation – Avoid breathing fumes - use in a well ventilated area at minimum. NIOSH approved respirator is recommended. Wear safety glasses, long sleeves and rubber gloves to minimize skin contact. This material has a high exotherm (generates heat). Do not mix components in glass or foam containers.
Materials should be stored and used in a room temperature environment (73°F/23°C). Elevated temperatures will reduce Pot Life. EpoxAmite™ HT must be properly measured and thoroughly mixed to achieve full performance properties. Because no two applications are quite the same, a small test application to determine suitability for your project is recommended if performance of this material is in question.
Applying a Release Agent – For releasing epoxy from non-porous surfaces such as resin, metal, glass etc., use Ease Release™ 200 or 205 (available from Smooth-On) to prevent adhesion.
Measuring / Dispensing – Accurate ratio measurements by weight are required for the material to cure properly and develop full physical properties. Refer to specified Mix Ratios in Handling Properties for proper measurements. Using a gram scale, dispense Parts A and B proper proportions into clean plastic, metal or wax-free paper containers.
Adding Color - EpoxAmite™ HT can be colored with UVO™ colorants (from Smooth-On). Pre-mix colorant with Part A thoroughly and then add Part B.
Mixing – Be sure mixing utensils are clean and free of any potential contaminants such as dirt, dust or grease. Mix Parts A and B thoroughly for at least 3 minutes with a square edged mixing stick. Be aggressive and scrape sides and bottom of mixing container several times. Use the square edge of mixing stick to bring material off of the sides of container and blend. If using a drill mixer, follow with hand mixing as directed above to ensure thorough mixing. NOTE: If mixture is to be used for coating, pour into a roller pan to extend Pot Life.
Adding Fillers - A variety of dry fillers can be added. Pre-mix dry filler with Part A before adding Part B.
Important - Mixed EpoxAmite™ HT is exothermic, meaning it generates heat. A concentrated mass of mixed epoxy in a confined area such as a mixing container can generate enough heat to melt a plastic cup, burn skin or ignite combustible materials if left to stand for its full Pot Life. Do not use foam or glass mixing containers or pour sections thicker than 1/2” (1.28 cm). If a batch of mixed epoxy begins to exotherm, move it to an open air environment.
Applying – Pouring: Mixed EpoxAmite™ HT is initially a low viscosity liquid that can be poured up to 1/2” (1.28 cm) thickness. Laminating: After epoxy is mixed, you must work quickly to apply multiple layers. Use a foam brush or roller to evenly spread a thin layer of resin over surface. Apply reinforcement fabric evenly into Resin. Ensure fabric ply is saturated. Plastic polyethylene spreaders may also be used.
Alternate additional thin layers of epoxy and fabric using above application method. Add additional epoxy as needed to wet out subsequent layers. Repeat as necessary until desired thickness is attained. After final layer of fabric is applied, use lamination roller to evenly distribute epoxy and reduce air bubbles. Be mindful of your Thin Film Working Time.
Cure Time: Cured material will be hard and unable to penetrate with a finger nail. Cured epoxy can now be dry sanded. If machining or sanding, wear NIOSH approved mask to prevent inhalation of particles.
Post Curing - EpoxAmite™ HT High-Temp Laminating Epoxy Post Cure Schedule:

This post cure schedule will result in a casting with a heat distortion temperature of 300°F / 149°C.
Note - Post curing in excess of 220°F (104°C) will cause this material to yellow. To retain clarity, use the following post cure schedule:

This post cure schedule will result in a high-clarity casting with a heat distortion temperature of 200°F / 93°C.
Painting – Cured EpoxAmite™ HT can be painted and / or primed and then painted with acrylic enamel paints. Let paint fully dry before putting part into service.
Removing Epoxy – Uncured / Non-curing epoxy: Scrape as much material as possible from the surface using a scraper. Clean the residue with E-POX-EE KLEENER™ available from Smooth-On, lacquer thinner, acetone or alcohol. Follow safety warnings pertaining to solvents and provide adequate ventilation.

Related Categories: Epoxy Casting, Coating and Laminating Resins

Related Series: EpoxAmite™ – Laminating Epoxy Systems

How-To Articles


Creating a High Temperature Tool Using EpoxAmite™ HT and EpoxAcoat™ HT

Creating a High Temperature Tool Using EpoxAmite™ HT and EpoxAcoat™ HT

High temperature tooling resins play an important role in creating composite parts and are a low cost alternative to metal molds.

 View How-To Article