Why is rubber suitable for making seals and gaskets?
It can form tight, flexible closures
A seal or gasket must fill the tiny gaps between two mating surfaces and hold pressure without letting fluid or gas escape.
Rubber is highly elastic (elastomeric): it deforms easily under clamping pressure to conform to surface irregularities and then springs back, maintaining continuous contact.
This elasticity lets rubber form a tight yet flexible closure that stays leak-proof even as parts vibrate, expand or shift slightly.
The other properties listed would disqualify a sealing material — absorbing water, reacting with chemicals or conducting electricity are undesirable in a gasket.
Hence, the answer is It can form tight, flexible closures.
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