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NEMA LI-1 & MIL-I-24768

Thermoset Plastic Composites for Industry

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Epoxyglas™ G10 & FR4
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Epoxyglas™ G10 FR4

Acculam® Epoxyglas G10 FR4, Epoxy Fiberglass, is a flame retardant epoxy resin and a woven fiberglass substrate. This qualifies to NEMA Grade FR4 and MIL-I-24768/27. This material has high mechanical strength and excellent electrical insulating qualities in both dry and humid conditions. It provides both insulating and structural functions in both dry and humid conditions, along with temperature resistance across a wide range of applications and industries. These attributes along with good fabricating characteristics allow it to be easily machined into complex parts with conventional milling and turning tools as well as waterjet and laser cutting.

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Matrix HT™ G14

Acculam ® Matrix HT ™ G14 is a thermoset composite comprised of woven fiberglass and a unique blend of high-temperature resin binders designed for applications that demand superior performance at elevated temperatures. Designed as a cost-effective alternative to Engineered Thermoplastics, Matrix HT G14 has outstanding flexural and impact strength, maintains a high percentage of mechanical, insulating properties up to 500oF. Matrix HT ™ G14 offers excellent dimensional stability and creep resistance as well as good resistance to moisture, chemicals, alkali, and acids. It does not melt or soften at elevated temperatures and offers users extended application capability beyond typical NEMA grades.

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Same day shipping on in-stock orders

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Get the materials you need, the way you need them.

State-of-the-art CNC Machined Parts

Our fabrication capabilities are extensive, boasting 3, 4, and 5-axis milling on parts up to 30” x 40” x 40” with 7 micron tolerance (0.0003”). We also offer CNC 3 and 5 axis routed parts up to 60” x 120” and precision cut-to-size panels or blanks. Our proprietary precision grinding process can achieve 0.0005” flatness and thickness tolerances with finishes that rival or surpass traditional lapping for composite materials.

Through our partnership with Vericut we can digitally run your part before it even gets to a machine to verify accuracy, and through our Keyence-equipped 8200 square foot quality laboratory, we can verify accuracies and tolerances in seconds.

Custom Part Quote with 3D Rendering

Acculam is proud to offer a next generation digital estimating system that can accurately provide you with a firm quote in less than 48 hours.

Your part will be viewable in 3D, with our manufacturing engineers comments with every quote we submit.

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Reliable and Affordable



Acculam boasts three state-of-the-art substrate coating lines. All of our materials are available in their un-pressed states and we have over 100 years of cumulative experience in custom formulation to meet your specific, custom need.

Proudly Based And

Manufactured In The USA


Acculam® is the premier manufacturer of Industrial Thermoset Laminate Plastics in the USA. Acculam was established in 1980 and is an ISO 9001 certified manufacturing company. We manufacture and inventory sheets, tubes and rods at our manufacturing plant in Falmouth, Massachusetts. Our Acculam® thermoset laminate products have taken their place in markets spanning six continents and earned world-class recognition and acceptance as the best. As an innovative manufacturer of laminated thermoset plastics, Acculam has maintained it’s lead in the manufacture of industrial laminates by incorporating technological innovation into the improvement of our product manufacturing process.

Epoxyglas™ G10 & FR4

N.E.M.A. grades G10 and FR4 Glass Cloth Reinforced Epoxy Natural color is typically yellowish to light green. The most versatile all-around laminate grades are continuous glass woven fabric impregnated with an epoxy resin binder. (Epoxy resins are among the most versatile and widely used plastics in the electronics field, primarily because water absorption is virtually nil, rendering it an outstanding insulator. Beyond its electrical insulating properties, epoxy resins exhibit superior adhesive properties and great dimensional stability - shrinkage is usually less than 1 percent). G10 andFR4 have extremely high mechanical strength, good dielectric loss properties, both wet and dry. The main difference between N.E.M.A. GradesG10 and FR4 is that FR4 is a fire-retardant grade of G10. Therefore, FR4 may be substituted where G10 is called out except in applications where halogens are not desired. G10 can never be substituted where FR4 is called for. (G10 certifies to Mil-I-24768/2 GEE; FR4 certifies to Mil-I-24768/27 GEE-F.)

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Largest Inventory of

Composite Materials


We have the largest inventory of composites in the country with over $15 million of composites in-stock at all times.

Our customers range from public and private space agencies, to automotive, to consumer electronics, to power generation and distribution. If there’s an industry that requires composite parts, we probably supply them. We have the largest inventory of composite materials in the country, which means we have the best cost on raw material and the fastest possible lead times.

Some of the industries that use laminates:

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