_______________ rubber is generally used for making 'O' rings used for vacuum sealings?
Correct answer: B. Neoprene
- A. Natural
- B. Neoprene
- C. Butadiene
- D. Nitrile
Explanation
Neoprene has good resistance to weathering, oils and vacuum-service conditions, making it a common choice for vacuum-sealing O-rings among these options. Natural rubber has poorer resistance to many service environments.
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