Butyl Sealants
A synthetic rubber-based sealant with outstanding impermeability to gases and moisture, used for body sealing, glazing, and noise damping in automotive assembly.
Overview
Butyl sealants are based on isobutylene-isoprene rubber (IIR), a synthetic elastomer with very low gas and moisture vapour permeability — the lowest of any common elastomer. In automotive manufacturing, butyl sealants are used as extruded or pre-formed tapes for bonding and sealing glass (windscreens, quarter lights), body seam sealing, door hem flanges, and acoustic damping applications. Their high tack and plasticity make them ideal for permanent compression seals. Butyl rubber is also used in tyre inner liners where its impermeability prevents air loss.
Automotive Applications
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Properties
Category
Type
Sealant
Available Colors
Available Forms
Key Properties
- Lowest gas permeability of elastomers
- High tack
- Good moisture resistance
- Acoustic damping properties
- Excellent weathering resistance
- Remains flexible at low temperature
Technical Specifications
Density
0.92 g/cm³
Temperature Resistance
–40°C to +120°C
Sustainability
Sustainability Rating
Butyl rubber is a synthetic elastomer and cannot be easily recycled. Its long-term sealing performance reduces maintenance requirements and leakage-related damage.