SIL SI40TR20 O-Ring, Size: -004
Material: SIL SI40TR20 O-Ring
Size: AS568 -004 O-Ring
Part Number: SI40TR20-OR-004
SI40TR20
Silicone (VMQ)
40
Shore A
PVMQ Type Silicone
Ultra Low Temperature Material
Color: Translucent (Clear)
Detailed Description
SI40TR20-OR-004 is a Translucent (Clear), 40 Shore A, Silicone (VMQ) O-Ring, a PVMQ Type Silicone product. SI40TR20 is manufactured with the following features & specifications: Ultra Low Temperature Material, General Purpose Material. SI40TR20-OR-004 is AS568 size -004 O-Ring also referred to as 1.78mm (Cross Sectional Diameter (CS)) x 1.78mm (Inside Diameter (ID)).
Material: SIL SI40TR20 O-Ring
Size: AS568 -004, 1.78mm CS X 1.78mm ID (0.070" CS X 0.070" ID)
| Technical Specification | Value |
|---|---|
| Compound Number | SI40TR20 |
| Material | Silicone (VMQ) |
| Subtype | PVMQ Type Silicone |
| Color | Translucent (Clear) |
| Durometer | 40 Shore A |
| High Temperature | 205 °C / 401 °F |
| Low Temperature | -108 °C / -162 °F |
| Geometry Specifications | |
| Cross Sectional Geometry | O-Ring |
| Size Standard | AS568 |
| Size | -004 |
| Cross Section (CS) | 1.78 mm / 0.070 in |
| Inside Diameter (ID) | 1.78 mm / 0.070 in |
SI40TR20 is a 40 shore A translucent PVMQ silicone compound engineered for ultra low temperature sealing where extreme flexibility is required. This material remains elastic down to -108°C, making it ideal for O-rings and gaskets used in cryogenic, aerospace, and cold environment industrial applications. Its low durometer allows for excellent conformability in low pressure systems, while still providing good resistance to ozone, detergents, salt water, and vegetable and animal oils. SI40TR20 meets ASTM D2000 M2GE405 requirements and delivers reliable performance in applications where standard elastomers would become brittle and fail.
PVMQ, or fluorosilicone rubber, is a specialized elastomer that combines the low temperature flexibility of silicone with improved resistance to fuels, oils, and certain solvents. These materials are widely used in O-rings and gaskets where both chemical exposure and extreme temperature conditions are present. Compared to standard silicone, PVMQ offers enhanced fuel compatibility while maintaining excellent performance in cold environments, making it a preferred choice for aerospace, automotive, and industrial sealing applications. While highly versatile, it may not match FKM in high temperature chemical resistance, so proper material selection is essential.
Keywords: SI40TR20, SI 40TR20, SI-40TR20, SI40 TR20, PVMQ silicone rubber, ultra low temp elastomer, 40A fluorosilicone, cryogenic O-rings, flexible gasket material, ASTM D2000 M2GE405, low durometer silicone, fuel resistant silicone seal, extreme cold elastomer, Datasheet, TDS, Test Report, MTR, MSDS, SDS