Polysulfide Synthetic Rubber Sealant—Stonhard

TABLE 2.5 POLYSULFIDE SYNTHETIC RUBBER SEALANT-STONHARD 

STONLAST i a heavy-duty, two-component synthetic rubber sealant. It adheres tenaciously to just about all building materials currently in use, and is unaffected by exposure to water or most corrosive gases. STONLAST s great flexibility allows the material to expand and contract to compensate for movement, vibration, etc., and it retains those properties over a wide range of temperatures (-65° to +2 5 F). 

The purpose of this guide is to aid in determining the potential value of Stonlast sealant when exposed to the damaging effects of erosive chemical spillages 

The test procedure used was to totally immerse cured samples of Stonlast in the chemicals listed for a period of 30 days at normal room temperature per ASTM D471-62T, Method B. (This is an exceptionally severe test, since most areas subject to chemical spillages such as these are flushed down periodically with water as part of the normal maintenance operation.) 

The resultant resistance of Stonlast to the various chemicals is related using the symbols listed below. 

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