Energy savings plus mechanical reinforcement and rheology control

Solvent Borne Butyl Sealant

Adhesives Formulation

Applicable Type

Sealants

Applicable Base Polymer

Butyl Rubbers (IIR)

Applicable Industrial Sectors

Buildings & constructions , Electrical & Electronic Bonding , Papers & Packagings

Applicable Base Polymer Properties

Butyl rubber is an elastomeric polymer that is used in a wide variety of construction adhesives and sealants. Because of its unique properties it also is used in the automotive and food processing industries among others. Butyl adhesives can be applied in a number of different forms. It can be used as a hot melt, solvent solution, preformed tape or gasket, and as a gun-dispensable sealant. Butyl rubber can be used as a primary base resin or as an additive for tack and other desired properties.

Typical Formulation Ingredients

Ingredient

Parts by weight

Butyl rubber

xxx

Mineral spirits

xxx

Petroleum resins

Pentaerythritol esters of rosin

Bentone Clay derivative

Finely Divided Silica

xxx

Fiber

Titanium dioxide

Cyracure Resin UVR 6105 (1)

Processing

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Resulting Properties

A typical butyl rubber caulking compound has the following composition shown in above. ASTM C1085 is a standard specification for a butyl rubber based solvent release sealant with a maximum of 10% joint movement capability. These have a service life of 5-15 years depending on the application. Butyl sealants are known for excellent adhesion to most substrates. However, they can stain adjacent surfaces and have relatively poor recovery from extension. The polymeric compositions along with the other additives will affect both the application and the ultimate performance properties of the joint. Typically solvent based butyl sealants have the following characteristics³

Excellent adhesion to many common substrates

Limited movement capabilities, generally up to +/- 10%

Excellent weathering

Good use as both adhesives and sealants

Sometimes used in curtain wall applications where adhesion to rubber compounds is needed

Most are stringy and difficult to apply neatly

May show some shrinkage after cure; may harden and crack over time on exposed surfaces.

Tips and Tricks

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