Silicone Rubber (PMQ, PVMQ, VMQ)
PMQ rubber is a thermoset elastomer or rubber material. It has a fairly low tensile strength and a moderately high ductility among rubber materials. The graph bars on the material properties cards below compare PMQ rubber to other rubber materials (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elongation at Break
480 %
Tensile Strength: Ultimate (UTS)
8.0 MPa 1.2 x 103 psi
Thermal Properties
Glass Transition Temperature
-130 °C -200 °F
Maximum Temperature: Autoignition
410 °C 760 °F
Maximum Temperature: Decomposition
460 °C 850 °F
Maximum Temperature: Mechanical
220 °C 430 °F
Specific Heat Capacity
1590 J/kg-K 0.38 BTU/lb-°F
Thermal Conductivity
0.23 W/m-K 0.13 BTU/h-ft-°F
Otherwise Unclassified Properties
Density
1.2 g/cm3 75 lb/ft3
Limiting Oxygen Index (LOI)
32 %
Common Calculations
Strength to Weight: Axial
1.9 points
Strength to Weight: Bending
7.4 points
Thermal Diffusivity
0.12 mm2/s
Followup Questions
Further Reading
Rubber Formulary, The, Peter A. Ciullo and Norman Hewitt, 1999