Butyl Rubber

Butyl rubber is one of the most widely used thermoset elastomers and is typically used for inner tubes and other industrial gas bladders.

Butyl rubber is also available in a halogenated form with either bromine or chlorine and this often increases its thermal performance while retaining the low gas permeability to gas and moisture.

Butyl rubbers can be bonded with most engineering adhesives and cyanoacrylates show high strength with the substrate failing before the adhesive bond (Table 4.1). Some solvent-based adhesives show good strength on butyl rubber, especially if the rubber is cleaned with a chlorinated solvent prior to bonding.

Adhesive type

Description

Shear strength (N/mm2)

Cyanoacrylate

Standard ethyl

>0.8*

Toughened

>0.7*

Ethyl + primer

>1.0*

Two-part acrylic

MMA

0.4

Silicone

Alkoxy silicone

0.4

UV acrylic

Visible light cure

0.6

Table 4.1 Adhesive shear strength (butyl rubber)

Notes: * Substrate failure

Подпись: All shear strengths are given as guidelines only and may vary considerably depending on grade of rubber, fillers, surface finish, etc. Recycling information [3] = rubber

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