Image shown is representative and may differ from the actual product in size, proportions, and color shade
4.500 in
(114.30 mm)
6.880 in
(174.75 mm)
1/2"
SIL SI70TR20 Ring Gasket, Size: 150#-4"-RN-1/2"
Material: SIL SI70TR20 Ring Gasket
Size: 150#-4"-RN-1/2" Ring Gasket
Part Number: SI70TR20-150#-4"-RN-1/2"
Color: Translucent (Clear)
Detailed Description
SI70TR20-150#-4"-RN-1/2" is a Translucent (Clear), 70 Shore A, Silicone (VMQ) Ring Gasket. It is a 70 durometer Silicone (VMQ). [SI70TR20 is manufactured with the following features & specifications: Ultra Low Temperature Material, General Purpose Material. SI70TR20-150#-4"-RN-1/2" is size 150#-4"-RN-1/2" Ring Gasket also referred to as 4 (Pipe Size) x 114.3mm (ID) x 174.75mm (OD) x 1/2" (Thickness). SI70TR20-150#-4"-RN-1/2" is a size 4, 150#-RN ASME Ring Gasket. Material: 70 Durometer SIL SI70TR20 Ring Gasket Size: 150#-4"-RN-1/2", 4 Pipe Size X 114.3mm ID X 174.75mm OD X 1/2" Thickness
| Technical Specification | Value |
|---|---|
| Compound Number | SI70TR20 |
| Material | Silicone (VMQ) |
| Color | Translucent (Clear) |
| Durometer | 70 Shore A Hardness |
| High Temperature | 205 °C / 401 °F |
| Low Temperature | -115 °C / -175 °F |
| Geometry Specifications | |
| Type | Ring Gasket |
| Size | 150#-4"-RN-1/2" |
| Pipe Size | 4 |
| ID | 114.30 mm / 4.500 in |
| OD | 174.75 mm / 6.880 in |
| Thickness | 1/2" |
SI70TR20 is a 70 shore A translucent PVMQ silicone compound engineered for ultra low temperature sealing where standard elastomers become brittle. This material maintains excellent flexibility down to -115°C while still providing reliable performance up to 205°C, making it ideal for O-rings and gaskets used in aerospace, cryogenic, and extreme cold industrial applications. It offers good resistance to ozone, detergents, salt water, and vegetable and animal oils, supporting long-term durability in harsh environments. SI70TR20 meets ASTM D2000 M7GE705 requirements and is well suited for applications requiring both extreme cold performance and environmental resistance.
PVMQ, or fluorosilicone rubber, is a specialized form of silicone that combines the low temperature flexibility of VMQ 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 better fuel and oil resistance while maintaining excellent low temperature properties, 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: SI70TR20, SI 70TR20, SI-70TR20, SI70 TR20, PVMQ silicone rubber, ultra low temp O-rings, fluorosilicone gasket material, cryogenic elastomer, ASTM D2000 M7GE705, translucent silicone rubber, aerospace sealing material, fuel resistant silicone, extreme cold elastomer, Datasheet, TDS, Test Report, MTR, MSDS, SDS
