Epoxy Casting and Epoxy Laminating Resins

Epoxy casting and epoxy laminating resins are widely used for:

  • High-performance composites based on glass, carbon, Kevlar®, and other fiber reinforcements
  • Lamination
  • Surface coat
  • Casting

Performance characteristics:

  • Tough
  • Rigid
  • High temperature resistance

Common Brands:

  • PTM&W

Epoxy Casting and Epoxy Laminating Resins

For laminating, surface coating, and casting

A broad range of products are available in both epoxy casting and epoxy laminating resins. By proper selection, the requirements of an application can be closely matched for consistent high quality results. These tooling materials are designed for ease-of-use, and their cured properties will usually exceed the requirements of the application. Our product offerings have minimum hazard potential and provide consistent high performance results in the most demanding applications.The PTM&W Epoxy Tooling line is an extensive group of materials designed to provide tough, durable molds, patterns and tools for both room temperature and high temperature service. Included in these products are surface coat systems, laminating materials and casting compounds that are tailored for specific areas of application.

Shop for Casting/Laminating Resins

RESINS 1gal Can, 5gal Pail
COLORS White, Amber, Black, Gray

Formulations vary by manufacturer, brand, and grade. Ask your Curbell Plastics representative for more specific information about an individual option or brand.


Epoxy surface coats (room temp, high temp)– are paste-viscosity resins designed to be applied by brush or squeegee to a model or pattern to function as the surface of the cured tool. They generally possess handling properties that facilitate easy mixing and application, and their cured properties provide a tough, durable surface that can be sanded or scribed with ease.

Epoxy laminating resin systems (room temp, high temp)– consist of both unfilled and filled products that are intended for use with reinforcing fabrics to construct high performance composite tooling prototypes and/or production parts.

Epoxy casting resins (room temp, high temp)– are versatile products that can provide an excellent solution to a variety of industrial applications. They generally contain a filler of some type that is provided to produce specific handling or cured properties. These fillers can be of a metallic or non-metallic nature. Certain fillers can provide lower shrinkage, higher compressive strengths, better metal forming properties, or other characteristics suited to a particular use. A variety of systems, for both room temperature as well as high temperature service are available with different hardeners to more closely match the material to the application.

Vacuum-assist resin-transfer method (VARTM)– is the procedure of infusing a resin matrix into plies of dry fabric, under vacuum, to make composite laminates. In this process, dry plies of fabric are laminated onto a hard mold surface along with release plies, flow media, vacuum lines, and resin distribution lines, with the entire laminate placed under a vacuum bag. Infusion resin/hardeners are batch-mixed and sucked into the laminate, by vacuum, through resin distribution lines. VARTM-type resin systems are identified by very low mixed viscosities and longer working times. Resin infusion for tooling has a number of advantages over using prepreg tooling materials: much lower material costs, easier ply positioning, less chance of delamination, no autoclave required, room-temperature demold, free-standing post cure, no refrigerated storage, and long shelf life. Resin infusion for production parts offers the same advantages as for tooling. This process is usually reserved for large structures such as boats or composite car bodies.


Epoxy Surface Coats for Tooling
PT1154 Kit A/B (white)– is a thixotropic, soft paste viscosity epoxy surface coat system that works very well in many demanding industrial applications. The resin and hardener combine easily to form a smooth, medium-low viscosity which spreads easily and picks up fine detail without trapping air on the surface. The mixed material provides good coverage on corners and projections on the pattern surface. When cured, PT1154 forms a tough, durable surface that is easy to sand or scribe, and gives long dependable service.
Epoxy Laminating Systems
PT2114 Kit A/B (white)– is a room temperature curing laminating resin for the construction of very stable tooling. PT2114 has excellent fabric penetration capabilities for easy, labor saving use. It exhibits minimum drain on vertical surfaces, which works well on multiple contoured configurations. Two hardeners are available for use with PT2114 resin for different sized laminates. Both offer similar handling properties and excellent cured physicals. PT2114 has seen wide usage in applications such as hammer forms, assembly fixtures, drill fixtures, master gages, checking fixtures, checking gages, duplicating masters, sandwich panels, prototype fabrications, and high strength laminated tooling.
Epoxy Casting Systems
PT4431 Part A (gray)– aluminum filled epoxy casting material that has excellent handling characteristics, and is useful for a wide range of applications. It is quite versatile, and can be cast from very thin sections to mass castings of more than 12 inches thick with the proper hardener. Cured castings made with PT4431 can be machined quite readily with standard cutting tools. PT4431 also provides an improved degree of thermal conductivity, due to its high aluminum content. PT4431 resin has been designed to exhibit an absolute minimum of filler settling in storage. The fillers do not “hard pack” with this system. PT4431’s thin pouring viscosity, easy machinability, cured toughness and dimensional stability provide good service in uses such as form blocks, close tolerance parts, drop hammer does, molds, hammer forms, cast duplicator models, draw dies, facing metal cores, foundry patterns, and holding and nesting fixtures.

PT4431 Part B (amber)– hardener with a pot life of 40-60 minutes.


Epoxy Surface Coats for Tooling
PT1540 Kit A/B (black)– is a graphite filled epoxy system that has very unique properties which makes it well suited for a number of tooling and production applications. It is intended for use as a surface coat on tooling or parts that will be exposed to moderate heat in service. The consistency of PT1540 has been designed to allow quick, easy application to large areas with minimum effort. It is a thin paintable material that will hang on contoured surfaces with no run-off. This thin, yet thixotropic viscosity has made PT1540 a very popular material for use in the fabrication of a broad number of parts and structures. PT1540 spreads smoothly with minimum air entrapment and picks up fine surface detail easily. Parts and structures made with PT1540 have good heat resistance, so they will withstand the heat of paint bake ovens, as well as extreme environmental temperatures in service.

PT1540 Part B1 (amber)– has a longer working time than Part B, which is useful when there are larger surface areas to cover.

PT1935 Kit A/B (black)– is a non-metal filled epoxy surface coat resin that combines easy handling and application characteristics with very good high temperature service capabilities. The smooth viscosity of PT1935 permits excellent reproduction of surface details without air entrapment or pinholes. When cured, PT1935 may be readily sanded or scribed, allowing layouts and engineering changes to be easily performed. PT1935 is highly resistant to surface cracking and checking during continuous high heat production cure cycles. PT1935 will faithfully reproduce the very high gloss of a properly prepared model. Also, due to the nature of the fillers it contains, PT1935 may be polished to a mirror finish after sanding or machining during rework or repair. PT1935 is a low toxicity potential resin. It does not contain vinvlcyclohexane diepoxide (VCHD) or other potentially restricted diluents.

PT1995 Kit 2 Part (black)– is a graphite filled surface coat resin with thermal expansion characteristics designed for high performance composite tooling. It is a thin paste that yields a smooth mixed viscosity suitable for brushing on flat or contoured surfaces. The controlled thixotropy allows easy application, and minimum sag on highly contoured tool surfaces. Its balanced filler content produces a finished surface that is easily scribed, and gives toughness and chip resistance in service. PT1995 cycles very well, and resists stress cracking in the most severe oven or autoclave applications. There are no restricted or regulated raw materials used in these high temperature products.

Epoxy Laminating Systems
PT2520 Kit A/B (amber)– is an unfilled epoxy laminating resin designed for the construction of tooling and components that will operate in the intermediate high temperature service range. It will gel at room temperature for subsequent oven post curing off the pattern with the Part B hardener. PR2520 Part B has a 45 to 50 minute pot life depending upon shop temperature. The mixed viscosity of PT2520 provides a system that penetrates the reinforcing fabric quite readily and holds the fabric in place, for fast, reliable fabrication. With the capability to post cure the laminate off the pattern, it is possible to use low temperature pattern materials such as wood or plaster for lower fabrication costs, since they will not be put into the oven for post cure. PT2520 has found good acceptance in such applications as vacuum form tools, foam molds, bond fixtures, layup molds, resin transfer molds, and other situations where repetitive heating and cooling cycles are involved. There are no restricted or regulated raw materials used in these high temperature products.

PT2620 Kit A/B1 (gray)– is a filled intermediate high temperature laminating resin intended for use in fabricating tools and fixtures for a variety of industrial applications. It is filled to provide lower cured shrinkage and to allow easy laminating with minimum drain or runoff on contoured or vertical surfaces. PT2620 handles very easily. The slightly thicker mixed viscosity penetrates the reinforcing fabric well and holds it in place as subsequent layers are applied. Tools made with PT2620 are tough, with high tensile and flexural strength, and excellent heat resistance. PT2620 Part B1 hardener will gel hard at room temperature for subsequent oven post curing off the pattern. The ability to perform an unsupported post cure off the pattern has significant advantages. With this capability, it is possible to use low temperature pattern materials such as wood or plaster, since they will not have to be put into the oven for post cure. The PT2620 systems have found good acceptance in such applications as vacuum form tools, foam molds, layup molds, and a variety of other uses where repetitive heating and cooling cycles are involved. There are no restricted or regulated raw materials used in these high temperature products.

PT2848 Kit 2 Part (amber)– is a lightly filled high temperature epoxy laminating resin designed specifically for demanding high performance composite tooling. It has good heat resistance, making it capable of providing excellent long term service in today’s higher temperature curing cycles. The resin has a medium-low viscosity, and, when combined with the hardeners recommended here, allows very easy handling in tool fabrication. The mixed systems wet out the tooling fabrics very readily. This allows faster tool production than when using more viscous materials. This feature is achieved without the use of hazardous or potentially restricted diluents.


EpoxyN-Fusion System
PT5712 Kit A/B1 (amber)– is a low viscosity epoxy system designed for the fabrication of parts and structures by the resin infusion method. The low mixed viscosity of this system allows it to penetrate the reinforcing materials easily and completely, producing a void-free, dense composite structure.The cured properties of this system are very high, so it produces items with good strength and toughness with excellent long-term stability.

Visit our Technical Resources for typical properties and additional data sheets.

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