Image shown is representative and may differ from the actual product in size, proportions, and color shade
4.500 in
(114.30 mm)
10.000 in
(254.00 mm)
8
0.880 in
(22.35 mm)
7.880 in
(200.15 mm)
1/2"
SIL SI70OR22 Full Face Gasket, Size: 300#-4"-FF-1/2"
Material: SIL SI70OR22 Full Face Gasket
Size: 300#-4"-FF-1/2" Full Face Gasket
Part Number: SI70OR22-300#-4"-FF-1/2"
SI70OR22
Silicone (VMQ)
70
Shore A
Ultra Low Temperature Material
Color: Orange
Detailed Description
SI70OR22-300#-4"-FF-1/2" is a Orange, 70 Shore A, Silicone (VMQ) Full Face Gasket. It is a 70 durometer Silicone (VMQ). [SI70OR22 is manufactured with the following features & specifications: Ultra Low Temperature Material. SI70OR22-300#-4"-FF-1/2" is a size 4, 300#-FF ASME Full Face Gasket. Material: 70 Durometer SIL SI70OR22 Full Face Gasket Size: 300#-4"-FF-1/2", 4 Pipe Size X 114.3mm ID X 254mm OD X 8 Bolt Qty X 22.350mm Bolt Dia. X 200.150mm Bolt Circle X 1/2" Thickness
| Technical Specification | Value |
|---|---|
| Compound Number | SI70OR22 |
| Material | Silicone (VMQ) |
| Color | Orange |
| Durometer | 70 Shore A Hardness |
| High Temperature | 205 °C / 401 °F |
| Low Temperature | -75 °C / -103 °F |
| Geometry Specifications | |
| Type | Full Face Gasket |
| Size | 300#-4"-FF-1/2" |
| Pipe Size | 4 |
| ID | 114.30 mm / 4.500 in |
| OD | 254.00 mm / 10.000 in |
| Bolt Qty | 8 |
| Bolt Dia. | 22.35 mm / 0.880 in |
| Bolt Circle | 200.15 mm / 7.880 in |
| Thickness | 1/2" |
SI70OR22 is a 70 shore A orange silicone (VMQ) compound formulated for extreme low temperature sealing applications where flexibility and reliability are critical. This ULT-grade silicone maintains elasticity down to -75°C while still providing stable performance up to 205°C, making it ideal for O-rings and gaskets used in aerospace, outdoor equipment, and cold climate systems. It offers good resistance to ozone, detergents, salt water, and vegetable and animal oils, supporting long-term environmental durability. SI70OR22 meets ASTM D2000 M7GE705 and A-A-59588 Class 1A and 1B requirements, and can be compared to Parker S0355-75 when evaluating equivalent low temperature silicone materials.
Silicone rubber, commonly referred to as VMQ, is widely used in O-rings and gaskets due to its exceptional temperature range and environmental resistance. ULT silicone grades are specifically designed to extend performance into extreme low temperature environments where most elastomers become brittle and fail. These materials are commonly used in aerospace, defense, and outdoor applications where consistent sealing is required across wide thermal cycles. While silicone performs well against ozone and weathering, it is generally not recommended for petroleum-based fuels or highly abrasive dynamic applications, making proper application selection important.
Keywords: SI70OR22, SI 70OR22, SI-70OR22, SI70 OR22, ULT silicone rubber, extreme low temp O-rings, VMQ 70A orange silicone, ASTM D2000 M7GE705, A-A-59588 Class 1A 1B, Parker S0355-75 equivalent, low temperature gasket material, ozone resistant elastomer, Datasheet, TDS, Test Report, MTR, MSDS, SDS, Parker S0355-75 O-rings, Parker S355-75 silicone seals, Parker S0355 gasket material, Parker S355 VMQ O-rings, Parker S0355 military spec gasket, Parker S0355 silicone compound
