Hot Melt Butyl Sealant Formulation B

Typical Formulation Ingredients

Ingredient

Parts by weight

Crosslinked butyl elastomer (Kalar 5214, Hardman, Inc.)

xx

Tackifier (Eastotac H-130E resin, Eastman)

xx

Polybutene (Indopol H-300, Amoco Chemical Co.)

xx

Calcium carbonate

xxxx

Antioxidant (Irganox 1010, Ciba-Geigy)

xxx

Amorphous polyolefin (Eastoflex APO, Eastman)

xx

(Source: Eastman Chemical Company)

Typical Properties

Properties

Shear stress, meters/gm after mixing for:

• 1 minute

xxx

• 8 minutes

xxx

• 15 minutes

xxx

Processing

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Resulting Properties

A typical butyl rubber sealing compound has the 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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Hot Melt Butyl Sealant Formulation (B)

Applicable Base Polymer Properties