Name: Butyl Rubber Self-Sealing Tape Base BR-100
Brand: Coatingsink
SKU: butyl-rubber-tape-br100
Availability: InStock

Question 1

Why is butyl rubber the preferred material for vapor-barrier tapes in building envelopes?

Accepted Answer

Butyl rubber (polyisobutylene) has an exceptionally low gas and moisture permeability among elastomers — its tightly coiled backbone and high chain flexibility at low temperatures result in minimal vapor diffusion. This makes BR-100 base ideal for sealing overlaps in vapour control layers and as a glazing bedding compound where moisture ingress must be prevented over decades.

Question 2

What is the processing method for BR-100 compound into finished tape?

Accepted Answer

BR-100 is supplied as a masterbatch compound that can be processed on internal mixers or open mills with fillers, tackifiers, and process oils. The compounded butyl is then extruded or calendered into tape form between release liners. It does not require vulcanization for sealing tape applications — the uncured tack is the functional property exploited in service.

Shore A	25–35
Elongation	≥500%
Tack (ASTM D2979)	≥1000 g
Temperature Range	-40 to 80°C
Moisture Permeability	very low (excellent vapor barrier)

Butyl Rubber Self-Sealing Tape Base BR-100

Specifications

FAQ

Interested in Butyl Rubber Self-Sealing Tape Base BR-100?