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Product Details:

Tested Compatible with Silicone, Butyl, Polyurethane and Polysulfide
U.V. Stabilized

CRL "TPR" Setting Blocks are compatible with most anything, meaning you can use them in designs calling for the use of modern structural glazing sealants. They are formed of a 90 durometer shore hardness thermoplastic rubber that performs as well as traditional neoprene setting blocks. They are available in the most asked for sizes of neoprene blocks. They have excellent chemical resistance, and do not mar or stain surfaces. Job specific testing, prior to start up, is recommended with each silicone sealant manufacturer.

Thickness: 3/8 in (9.5 mm)
Width: 1/2 in (12.7 mm)
Length: 2 in (50.8 mm)