Definition

1. Noun:
   • A synthetic rubber: "Butyl rubber" is a type of synthetic (man-made) elastomer. It is produced through the chemical process of polymerizing isobutylene, often with a small amount of isoprene. It is known for its excellent impermeability to gases and good flexibility.

Usage Examples

• Noun:
  • The inner tube of the tire is made from butyl rubber because it holds air very well.
  • For the chemical-resistant gloves, they chose a material based on butyl rubber.
  • The sealant's primary component is butyl rubber, which provides a long-lasting, waterproof bond.

Advanced Usage

• Technical Specification: In industrial contexts, "butyl rubber" is often specified for its low gas permeability and damping properties.
  • The specification calls for a liner of butyl rubber to prevent vapor transmission.

Variants and Related Words

• IIR (Isobutylene Isoprene Rubber): This is the technical, standardized name for butyl rubber.
• Halobutyl rubber: A modified form of butyl rubber (e.g., chlorobutyl or bromobutyl rubber) that can be more easily vulcanized with other rubbers, commonly used in tire inner liners.

Synonyms

• Isobutylene-isoprene rubber: The full chemical name.
• Synthetic elastomer (specific type): A broader category to which it belongs.

Related Phrases / Compounds

• Butyl rubber sealant: A mastic or adhesive product whose primary polymer is butyl rubber.
• Butyl rubber liner: A sheet or layer made of butyl rubber used as a barrier.

Noun

1. synthetic rubber made by polymerizing isobutylene