Image shown is representative and may differ from the actual product in size, proportions, and color shade
0.139 in
(3.53 mm)
5.234 in
(132.94 mm)
SIL Parker S1138-70 X-Ring, Size: -252
Material: SIL Parker S1138-70 X-Ring
Size: AS568 -252 X-Ring
Part Number: S1138-70-XR-252
Color: Red
Detailed Description
S1138-70-XR-252 is a Red, 70 Shore A, Silicone (VMQ) X-Ring made from Parker Seal® (Parker). It is a 70 durometer Silicone (VMQ). Parker Seal® (Parker) S1138-70 is manufactured with the following features & specifications: FDA Compliant, USP Class VI. S1138-70-XR-252 is AS568 size -252 X-Ring also referred to as 3.53mm (Cross Sectional Diameter (CS)) x 132.94mm (Inside Diameter (ID)). Material: 70 Durometer SIL Parker S1138-70 X-Ring Size: AS568 -252, 3.53mm CS X 132.94mm ID (0.139" CS X 5.234" ID)
| Technical Specification | Value |
|---|---|
| Compound Number | S1138-70 |
| Brand | Parker Seal® (Parker) |
| Material | Silicone (VMQ) |
| Color | Red |
| Durometer | 70 Shore A Hardness |
| High Temperature | 204 °C / 399 °F |
| Low Temperature | -51 °C / -60 °F |
| Geometry Specifications | |
| Cross Sectional Geometry | X-Ring |
| Size Standard | AS568 |
| Size | -252 |
| Cross Section (CS) | 3.53 mm / 0.139 in |
| Inside Diameter (ID) | 132.94 mm / 5.234 in |
| Other Specifications | |
FDA Compliant | |
USP Class VI | |
USP <87> | |
Parker S1138-70 is a 70 shore A rust-colored silicone (VMQ) compound formulated for FDA and USP Class VI compliant sealing applications in sanitary and regulated environments. This material is well suited for O-rings and gaskets used in food processing, medical devices, and pharmaceutical systems where cleanliness and biocompatibility are critical. It offers excellent performance in dry heat and low temperature conditions, along with good resistance to ozone, weathering, and aging, ensuring long-term durability. With a typical service temperature range of approximately -60°F to 400°F, S1138-70 provides reliable sealing in demanding high purity applications.
Silicone rubber, commonly referred to as VMQ, is widely used in O-rings and gaskets due to its broad temperature range and excellent environmental resistance. High purity silicone compounds that meet FDA and USP standards are specifically designed for use in medical, pharmaceutical, and food industries where material safety and consistency are required. These materials maintain flexibility at low temperatures while providing stable performance at elevated temperatures, making them ideal for thermal cycling applications. While highly versatile, silicone compounds are generally not recommended for ketones, strong acids, or certain fluid environments, making proper material selection essential.
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