Millable polysulfide

The solid polysulfide products are light brown millable mbbers. Thiokol ST [9065-29-6] (2) is made as in equation 11 with 2% branching agent added. Its... 

In addition to the liquid polysulfides, polysulfide millable gum elastomers have been used for many years with conventional rubber processing equipment. Compounds based on solid elastomers are being used in the manufacture of paint spray hose, rollers, and printing blankets for the graphic arts industry. New applications for these versatile materials are still being developed. 

Thiokol FA, a polysulfide rubber, does not plasticize on the mixing mill without a chemical plasticizer such as benzothiazyl disulfide. Thikol ST, another grade, has its molecular weight adjusted so that it is millable. Thiokol FA is vulcanized by zinc oxide and Thiokol ST by zinc oxide or a paraquinone dioxime/zinc oxide combination. 

ST polysulfide rubber is a millable gum elastomer prepared from bis (2-chloroethyl) formal and sodium polysulfide. Vulcanizates exhibit outstanding resistance to a broad spectrum of oils and solvents, to gas permeability, low temperature, ozone and weathering. Typical uses include gas meter diaphragms, rollers, printing blankets, o-rings, and many specialty molded items. 

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