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State any four reasons of failure of pneumatic seals.

Question: 

State any four reasons of failure of pneumatic seals.

Answer: 

1. Incompatibility of seal material with operating system 2. Excessive heat 3. Excessive load 4. Excessive clearance 5. Excessive pressure 6. Improper fitting 7. Improper groove geometry 8. Abrasion 9. Wear