STEMA / MATERIALS
Material guide
Indicative chemical resistance of industrial sealing material families.
PU is shown in two variants: polyester-based and polyether-based polyurethane. Their resistance assessments differ, so they have separate rows.
| Material | Min °C | Max °C | Petrol / diesel / engine oil | Glycol / coolant | Ozone / outdoor exposure | Mineral hydraulic oil | Water | Brake fluid DOT 3/4/5.1 |
|---|---|---|---|---|---|---|---|---|
| NBR | -30 | 100 | Good | Good | Poor | Good | Good | Poor |
| HNBR | -30 | 150 | Good | Good | Conditional | Good | Good | Poor |
| EPDM | -45 | 150 | Poor | Good | Good | Poor | Good | Good |
| FKM | -20 | 200 | Good | Conditional | Good | Good | Conditional | Poor |
| FFKM | -15 | 260 | Not assessed | Not assessed | Good | Not assessed | Not assessed | Not assessed |
| VMQ / Silicone | -55 | 200 | Poor | Conditional | Good | Conditional | Good | Conditional |
| CR / Neoprene | -35 | 100 | Conditional | Good | Conditional | Conditional | Good | Poor |
| PU – polyester-based | -30 | 80 | Conditional | Poor | Good | Good | Conditional | Poor |
| PU – polyether-based | -30 | 80 | Conditional | Conditional | Good | Good | Good | Poor |
| PTFE | -200 | 260 | Good | Good | Good | Good | Good | Good |
| NR / Natural rubber | -50 | 80 | Poor | Conditional | Poor | Poor | Good | Conditional |
This is an indicative family comparison, not a compound approval. Temperature limits are general family ranges, not continuous service ratings for every medium. FFKM short-term heat tests are described separately in its datasheet. Concentration, temperature, pressure, exposure and compound can change suitability. Ozone exposure differs from compressed-air service; assess lubrication, motion and temperature separately. PTFE is not an elastomer. Confirm the exact grade and conditions for critical applications.