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The material selection platform
Adhesives Ingredients
The material selection platform
Adhesives Ingredients

Hot Melt Butyl Sealant Formulation (A)

Adhesives Formulation

Applicable Type
Applicable Base Polymer
Applicable Industrial Sectors

Applicable Base Polymer Properties

Butyl rubber is an elastomeric polymer that is used in a wide variety of construction sealants. Because of its unique properties it also is used in the automotive and food processing industries among others. Butyl sealants can be applied in a number of different forms. It is used widely 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
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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