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Structural Thermoset Compounds™ - Technology
Structural Thermoset Compounds

Material Grade

Proposed Application

SMC Series

BMC Series
High Strength The STC-1000 line takes BMC to the next level of strength by formulating the product with high levels of reinforcement. STC 1000
High Strength &
Corrosion Resistant
The STC-1100 line represents a highly corrosive resistant composite with high strength. STC 1100
High Strength &
Corrosion Resistant
The STC-1200 line represents a custom blend of the STC-1000 and STC-1100 series to yield a unique value proposition. STC 1200
High Strength The STC-2000 line represents a traditional thermosetting composite with the added advantage of high glass concentration allowing high strength at a great value. STC 2000
High Strength & High Corrosion Resistant The STC-2100 line represents a highly corrosion resistant thermosetting composite armed with high strength performance. STC 2100
High Strength & High Corrosion Resistant The STC-2200 line is a custom blend of both the STC-2000 and STC-2100 chemistries allowing the composite to be customized for performance and value. STC 2200
High Strength & Impact Resistant The STC-2300 line represents a thermoset technology that utilizes hybrid technology to yield amazing toughness and improved impact performance. STC 2300
High Strength,
Corrosion Resistant & Impact Resistant
The STC-2400 line yields corrosion resistant properties in addition to high strength, toughness, and improved impact strength. STC 2400
High Strength & Low Density Carbon Fiber The STC-3100 line excels when low density and high mechanical values are desired. The coupling of a highly corrosive composite with the newest carbon fiber options yields versatility and high modulus (stiffness) in a value added package. STC 3100
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Structural Thermoset Compounds are ideal for:
Military & Aerospace Transportation Safety Medical
Electrical Oil & Gas Alternative

Structural Thermoset Compounds
Deliver Exceptional Strength and Design Flexibility

Structural Thermoset Compounds are engineered composites that represent a new product technology from IDI that addresses the needs of specific high-performance applications requiring exceptional strength and rigidity, plus resistance to extreme temperatures and corrosive environments. Structural thermosets consist of fiber reinforcement in a polymer resin. The fiber provides strength and stiffness, while the resin protects the fibers and gives the material its shape. The properties of a high-performance compound can be changed by varying the type and quantity of its ingredients. Fiber type, length, and mix proportion help determine properties such as strength and rigidity. Resin characteristics can be changed to provide the desired heat and corrosion resistance.

Comparison of Structural Thermoset Compounds to Competing Materials

Material Specific
Elongation Tensile
    Mpa % Mpa 10-6  
SMC 1.9 74 1.6 9000 12 SMC Alliance
Polypropylene 1 15 300 1400 60 Basell
Polycarbonate 1.2 55 150 2100 90 GE
Polyurethane 1.4 28 2.8 1300 45 Saechtling
Steel 7.85 410 28 210000 12 Dubbel
Aluminum 2.7 180 5 70000 24 Dubbel
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.

As for reinforcement, many types of fiberglass materials can be used in structural thermosets, depending on the molding process and the product’s strength requirements. Glass reinforcement options include chopped strand, mat with random fiber orientation, light textile fabrics, heavy woven materials, knitted materials, and uni-directional fabrics. Fiber lengths range from 1/2-2.0 inches (12.7mm – 50.8mm) for SMC and 1/32-1/2 inch (.75-12.7mm) for BMC. IDI also offers carbon fiber reinforcement for applications that require exceptional strength coupled with severe weight restrictions.

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