| Family | Common Names | Temp Range | Relative Cost | Chemical Compatibility | Primary Failure Mode | |
|---|---|---|---|---|---|---|
| ✔ Primary Strengths | ✘ Avoid (Key Risks) | |||||
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| Family | Mechanical Properties | Notes | ||||
|---|---|---|---|---|---|---|
| Hardness (Shore A) | Tensile Strength (MPa) | M100 Modulus (MPa) | Elongation at Break (%) | Compression Set | ||
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⚠ The FKM Split
You must distinguish between Standard FKM (Dipolymer/Terpolymer, e.g. Viton™ A) and GLT-type FKM (Perfluoromethylvinylether). Using a standard Viton™ A in a −40°C environment will cause glass-transition failure and leakage.
⚠ Hydrolysis Warning — Polyurethane
Always distinguish between Polyether and Polyester Polyurethane. Polyether is required for any application involving moisture or high humidity. Polyester types will crumble.
⚠ Ozone Protection — NBR
NBR seals must be stored in UV-resistant packaging and kept away from sparking electric motors to prevent premature surface cracking and embrittlement.
ℹ Material Memory — PTFE / FFKM
PTFE and FFKM have lower resilience than NBR. Special installation tools are often required to prevent permanent stretch or shearing during assembly. Handle with care.