Materials · 星辰 7503
OMS7503
Lowest-durometer compound in the range with a 17 % compression set — selected for dry etch and strip where seal recovery matters.
Properties
ASTM methods, stated conditions
- Hardness
- 70 Shore A (ASTM D2240)
- Tensile strength
- 15.5 MPa (ASTM D412)
- Elongation at break
- 189 % (ASTM D412)
- Compression set
- 17 % (ASTM D395 Method B, 70 h @ 200 °C, 25 % deflection, Type B)
- Service temperature
- -10 °C to +275 °C
- Process compatibility
- Dry
- Seal type
- Static + Dynamic
- Colour
- Black
Read the compression set with its condition — 23 % measured at 300 °C tells you nothing about performance at 200 °C. Every figure on this site is published with the temperature and duration it was measured at, so you can compare grades on the same basis.
Typical applications
Dry etch, wet etch, strip / ashing, CVD
Comparable grades
Cross-reference
| Grade | Hardness | Service temp. | Comp. set | Why we pair them |
|---|---|---|---|---|
| Chemraz® 605 | 80 Shore A | −20 to +260 °C | 22 % | Comparable dry-etch duty. Lower durometer here, but a materially better published compression set. |
Parameter-level comparison only — This pairing is drawn from publicly published hardness, temperature and compression-set figures and is a screening aid, not an equivalence claim. Sealing performance depends on your actual media, temperature, pressure, motion and gland design. Validate with a sample before switching an approved part.
Other grades
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