Full definition
Butyl rubber sheet, produced from IIR (isobutylene-isoprene rubber), is known for its exceptional gas impermeability, which is 8-10 times lower than that of natural rubber (NR). This property makes it particularly suitable for applications requiring airtight seals, such as gas-sampling bags and chemical tank linings. The remarkable vibration damping capabilities, with a rebound resilience of 12-20%, also position butyl rubber sheets as a preferred material for noise and vibration control in various industrial sectors. The sheets can be manufactured in thicknesses ranging from 1.5 to 6 mm, while the hardness typically falls within the range of 40 to 75 Shore A, allowing for a versatile application across different environments and requirements.
The temperature range for butyl rubber sheets is impressive, spanning from -45°C to +120°C. This makes it suitable for diverse applications that encounter extreme temperatures. In addition to its mechanical properties, butyl rubber exhibits outstanding resistance to ozone, weathering, and a range of chemicals, including dilute acids and alkalis. However, it has limitations in resisting mineral oils and hydrocarbon solvents, which should be considered when selecting materials for specific applications.
In practical applications, butyl rubber sheets are commonly used in the automotive industry for sound deadening and vibration isolation panels, significantly reducing noise levels—up to 10-20 dB when bonded to metal substrates. In the pharmaceutical sector, these sheets serve as effective closures for bottles and other containers, ensuring product integrity. Additionally, butyl rubber is available in chlorobutyl and bromobutyl variants, enhancing its heat resistance and compatibility for co-vulcanization processes, thus extending its usability across various industries.