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Cometech QC-631 / QC-631A Compression & Deformation Tester | Rubber Compression Set (ASTM D395, ISO 815)
- Static compression set fixture for rubber under constant compression and heated conditions to evaluate permanent deformation (compression set).
- Designed to be used together with an oven and a thickness gauge for complete testing workflow.
- Stainless-steel construction (SUS 304) with 3 compression plates creating two test spaces.
- Includes spacer ring set (10 pcs) with selectable thickness sizes for standardized setup.
- Conforms to ASTM D395, ISO 815, JIS K6262, and GB/T 7759 (per Cometech catalog).
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Overview
Cometech QC-631 / QC-631A Compression & Deformation Tester is a static-state fixture used to test rubber under constant compression and heat in order to determine the material’s permanent deformation rate (compression set).
The test method requires pairing the fixture with an oven and a thickness gauge to apply the thermal condition and measure thickness change before/after conditioning.
This setup is widely used in rubber QC and formulation comparison where long-term sealing and elastic recovery performance matter.
Technical Specifications
Standards (as listed)
- ASTM D395.
- ISO 815.
- JIS K6262.
- GB/T 7759.
Core specifications
| Models | QC-631, QC-631A. |
|---|---|
| Industry | Rubber. |
| Material | Whole set made of SUS 304 stainless steel. |
| Compression plates | 3 plates (2 test spaces). |
| Compression plate surface | Ground finish to improve flatness; surface roughness below 0.25 μm. |
| Spacer rings | 1 set (10 pcs); thickness size options include 5.0, 7.62, 8.89, 9.52, 10.16 mm (choose one size). |
| Included accessories | Five bolts & nuts, open-end wrench. |
| Dimensions | 20 × 10 × 12 cm. |
| Weight | 7 kg. |
Test setup requirements (important)
- This test needs to be used together with an oven and a thickness gauge.
- Related equipment referenced by Cometech includes QC-605L oven and SM thickness gauge series.
Support materials (as listed)
- Cometech indicates availability of Test Video, Teaching material, SOP, and Test Case on the product page.