Solvent Borne Butyl Caulking Compound

Typical Formulation Ingredients

Ingredient

Parts by weight

Butyl rubber (Bucar 5214, Cities Service Company)

xxx

Isobutene polymer (Indopol H-100, Lipo Chemicals)

xxx

Filler: calcium carbonate

xxx

Filler: talc (Asbestine 3X, International Talc Company)

xxx

Filler: titanium dioxide

xx

Tackifier: Thermoplastic resin (Betaprene CV-140, Reichold Chemicals)

xx

Solvent: VM&P naphtha

xxx

Typical Properties

Properties

Total solids content, %

xx

Slump, in

xxxxx

Extrudability, secs / milliliter

xxx

Shrinkage, %

xx

Weight / gallon, lbs

xxxxx

Processing

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Resulting Properties

A typical butyl rubber sealing compound has the following composition as shown above. 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 butyl sealants with this formulation have the following characteristics:

Conformance to Federal Specification TT-S-001657
Good tack free time
Excellent adhesion to many common substrates
Excellent weathering
Low permeability to moisture and gases

Tips and Tricks

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