_______________ rubber is generally used for making ‘O’ rings used for vacuum sealings?

_______________ rubber is generally used for making ‘O’ rings used

1.	_______________ rubber is generally used for making ‘O’ rings used for vacuum sealings?
A.	Natural
B.	Neoprene
C.	Butadiene
D.	Nitrile
Answer» C. Butadiene

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_______________ rubber is generally used for making ‘O’ rings used for vacuum sealings?

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