Questions about Thermoset Composites?

Low Profile, Zero Shrink Sheet Molding Compound

These materials are intended for use in automotive or transportation body panels that require painting. These composite materials exhibit a zero or near zero shrink characteristic and in some cases can be designed to have modest expansion. They are not intended have superior color properties but will provide a suitable surface for adhesion and surface quality.

Please note: all of our materials are custom developed to meet your specific requirements, if you don't see a product performance metric that meets your needs, call us to discuss your specific project requirements at 317.773.1766 or email us at

Low Profile, Zero Shrink Sheet Molding Compound

S31 Series – Class "A" Grade
Sheet Molding Compound (SMC)


Glass Content 26%



Impact Strength-Izod Unnotched
Test Method: ASTM D-4812


1,067 J/m

Flexural Strength
Test Method: ASTM D-790

24,000 psi

166 MPa

Flexural Modulus
  0.5 mm deflection
  2.5 mm deflection
Test Method: ASTM D-790

1,500 ksi

10 GPa
7 GPa

Tensile Strength
Test Method: ASTM D-638

10,000 psi

69 MPa

Tensile Modulus
Test Method: ASTM D-638

2,000 ksi

15 GPa

Compressive Strength
Test Method: ASTM D-695

27,000 psi

186 MPa

Water Absorption (24 Hrs @ 23C)
Test Method: ASTM D-570

0.2 to 0.4%

Barcol Hardness
Test Method: ASTM D-2583

40 to 60

Specific Gravity
Test Method: ASTM D-792

1.8 to 1.9

Test Method: ASTM D-955

0.0 to 0.1%

Smoothness Index
Test Method: GM931AP


Click to download a pdf of the S31 Series Data Sheet

The information on this sheet is a guide. The stated values reflect an average of several tests conducted on CI's goods. These values were obtained under ideal conditions and may not be replicated in any particular test, part, or application. Because the values achieved in actual parts depend considerably on part design, molding conditions, and testing methods, no guarantee is made or implied regarding values to be obtained in any specific test, part, or application. CI makes no warranty or representation as to the suitability of any of its goods for use in any application. CI relies on customer to conduct its own tests and judge for itself the suitability of CI's goods.