Brombutylgummi

Brombutylgummi, also known as brombutyl rubber or Naturrubber, is a synthetic elastomer belonging to the butyl rubber family. It is produced by copolymerising isobutylene with a small proportion of bromine‑substituted butadiene, typically in the range of 1–3 %. The bromine atoms enhance the material’s resistance to heat and chemicals, making it desirable for applications that require durability under harsh conditions.

The polymer's structure gives Brombutylgummi exceptional barrier properties against gases, especially against oxygen and moisture. This makes it widely used in tire construction for inner liners, conveyor belts, and sealing rings, as well as in industrial packing materials and heat‑shrink sleeves. Its low thermal conductivity and good chemical stability also render it suitable for acoustic panels and protective coatings.

In terms of processing, Brombutylgummi can be shaped by extrusion, injection moulding, and vacuum forming. It typically requires curing agents such as peroxides or metal soaps to achieve cross‑linking. The material exhibits relatively low shrinkage and good dimensional stability across a broad temperature range, from −55 °C to +150 °C.

Historically, the development of Brombutylgummi dates back to the mid‑20th century when researchers sought alternatives to natural rubber that retained its beneficial properties while improving resistance to weathering and chemical attack. Since then, it has become a staple in industries where lightweight, long‑lasting elastomers are critical, including automotive, aerospace, and power‑generation sectors.