Materials · 星辰 7542
OM7542
The low-temperature member of the range at −42 °C, for pumps, valves and mechanical seals in cold-start service.
Properties
ASTM methods, stated conditions
- Hardness
- 75 Shore A (ASTM D2240)
- Tensile strength
- 20.5 MPa (ASTM D412)
- Elongation at break
- 190 % (ASTM D412)
- Compression set
- 19.6 % (ASTM D395 Method B, 70 h @ 200 °C, 25 % deflection, Type B)
- Service temperature
- -42 °C to +230 °C
- Process compatibility
- Wet
- 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
Mechanical seals, pumps, valves, compressors, reactors, instruments
Comparable grades
Cross-reference
| Grade | Hardness | Service temp. | Comp. set | Why we pair them |
|---|---|---|---|---|
| Kalrez® 0040 | 70 Shore A | −42 to +220 °C | — | Matching −42 °C lower limit. Higher durometer here; their upper limit is slightly lower. |
| Chemraz® 564 | 80 Shore A | −40 to +230 °C | — | Comparable low-temperature wet-media service. |
| Chemraz® 678 | 90 Shore A | −40 to +230 °C | — | Comparable low-temperature range at a much higher durometer — relevant if rapid gas decompression is a concern. |
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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