Questions about Thermoset Composites?

Custom Formulated Bulk & Sheet Molding Compounds - Technology




View The SMC/BMC Product Matrix


The most common thermoset resins are polyester, vinyl ester, polyurethane, and epoxy. Each of these resins has its own price and performance characteristics, so selection is based on the functional and cost requirements of the application. For instance, design engineers might choose vinyl ester resin for corrosion-resistant products, epoxy resin for high-strength applications, or polyester resin when good overall performance and cost are the driving factors.

Bulk Molding Compounds (BMC) and Sheet Molding Compounds (SMC) are both fiber reinforced materials, typically utilizing glass strand fibers of varying lengths. SMC uses slightly longer length fibers than BMC, and typically has a higher percentage of reinforcement fibers than BMC. Fiber Lengths range from 1/32-inch in BMC up to 1-inch in some SMC's, resulting in various strength characteristics which can be customized for individual needs. IDI also offers carbon fiber reinforcement for applications that require exceptional strength coupled with severe weight restrictions in our Structural Thermoset line of products.

For more information, on Sheet Molding Compounds and Bulk Molding Compounds.

Material Performance

Material Description


Flame Resistant

IDI's Flamevex materials offer a range of flame performance levels that can be tailored to an OEMs requirements. From UL 94 V0 and 5VA to the Bonfire testing levels, we work with customers to identify the flame performance level best suited for their application.


Lightweight & Aesthetic

These materials are intended for use in automotive or transportation body panels that require painting. These composite materials exhibit a minimal expansion characteristic. They are not intended to have superior color properties but will provide a suitable surface for adhesion and surface quality.


High Glass Fiber Composites

Reinforced with 40% - 65% discontinuous glass fiber, this high level of reinforcement imparts high strength and impact resistance to these composite materials. The discontinuous nature of the reinforcement allows these materials to be molded into complex geometries by compression molding processes.


Carbon Fiber Composites

Raise the bar on stiffness as a function of weight, these products are well suited for complex geometric applications that require performance optimized high stiffness and low weight.


Custom Formulated Sheet (SMC) & Bulk Molding Compounds (BMC)

Material Performance

Material Description

SMC Series

BMC Series

General Purpose

General purpose composite materials with a wide range of applications. Suitable applications are typically structural in nature with no flammability requirements.



Heat and Corrosion Resistant

Composite materials intended for use in sanitary, cookware, appliance and indirect food contact applications.



Low Shrink Materials

Low shrink composite materials. Well suited for applications requiring shrink <0.1%.



UV Stable

These materials are suitable for use in applications requiring superior colorfastness & physical property retention upon exposure to UV and visible light.



Low Flame & Smoke Toxicity

These materials provide low flame & smoke toxicity in accordance with ASTM E162 and E662 standards.


Corrosion Resistant

These composites are typically unsaturated polyester or epoxy vinyl ester materials formulated to meet the strict performance requirements of pumps, pipe flanges & underground applications that are impacted by corrosive environments.



Dielectric & Flame Resistant

DielectriteTM is suitable for electrical applications requiring a composite material that possesses a UL Yellow card and flammability performance from UL94 HB, V-0 & 5VA. These materials can be found in Underwriters Laboratory file E53587.

E200 Series

40 Series

Electrical Insulators & Flame Resistant

These high strength Rosite BMC composites are suitable for use in electrical applications requiring materials that possesses dielectric properties and flammability performance from UL94 HB, V-0 & 5VA. These materials can be found in Underwriters Laboratory file E53587.

3000 Series

6000 Series

Flame Resistant & Low Smoke Toxicity

This composite is certified as a low smoke toxicity material with a UL94 V-0 flame rating. It's physical characteristics have been certified to meet several US Municipal Transit Authority specifications.


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