Which material is a copolymer of isobutane and isoprene, known as a sealant with low recovery, slow cure, and good elongation?

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Multiple Choice

Which material is a copolymer of isobutane and isoprene, known as a sealant with low recovery, slow cure, and good elongation?

Explanation:
Butyl rubber is the material described. It’s a copolymer of isobutylene (isobutene) with small amounts of isoprene, and it’s prized as a windshield sealant because it cures slowly, stays very flexible, and can elongate a lot without taking a set. This combination creates a durable, airtight seal around the edge of the glass that tolerates movement and temperature changes. The other options don’t match this polymer profile: a general caulk isn’t defined by this specific copolymer, ceramic coating/frit is inorganic, and “bond” isn’t a material type used as a sealant in auto glass.

Butyl rubber is the material described. It’s a copolymer of isobutylene (isobutene) with small amounts of isoprene, and it’s prized as a windshield sealant because it cures slowly, stays very flexible, and can elongate a lot without taking a set. This combination creates a durable, airtight seal around the edge of the glass that tolerates movement and temperature changes. The other options don’t match this polymer profile: a general caulk isn’t defined by this specific copolymer, ceramic coating/frit is inorganic, and “bond” isn’t a material type used as a sealant in auto glass.

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