Driver Shell / Chuck Inserts
What is Durometer?
The Durometer is the international standard for measuring the hardness of rubber, plastic and other NON-METALIC materials. A durometer tool measures a compound's susceptibility to indentation, which should not be confused with durability or tensile strength as there is no inherent relationship across all compounds. Durometers are described in the American Society for Testing and Materials specification ASTM D2240. There are a variety of Durometer scales. Our products are measured using the "Shore A" Scale
See Insert and Shell Selection Chart
Polyurethane
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Exhibits excellent wear properties and leaves little to no residue or particulates ensuring an unmarked closure. Durometers up to 80-85 available on request.
Durometer 45-55
Vinyl
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Offers grip on caps where polyurethane may slip. Generally suggested for caps that feature smooth contact surfaces.
Durometer 45-55
White Rubber
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Often matched to applications with white closures or caps to avoid marking. Suggested for smooth contact surfaces or minor serrations.
Durometer 50-60
Black Rubber
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A slightly higher durometer helps extend life while offering the same level of grip as white. The color makes it ideal for dark colored caps.
Durometer 60-70
Tan Rubber
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This is the hardest of the rubber inserts and is suggested for metal caps with serrations or very abrasive applications.
Durometer 70-80
Pump Spray Inserts
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SWAN-MATIC offers standard size pump spray cap inserts as IN-STOCK items. They are designed to work best with pump spray caps featuring bases considerably wider than the protective cap.
Durometer 50-60