Abstract: A method is disclosed for covering a roof with seamable sheet material for roofing prepared from a polymeric composition of matter comprising the steps of: applying layers of sheet material prepared from a seamable polymeric composition of matter to the roof being covered, overlapping adjacent edges of said layers, and adhering the overlapped areas to provide an acceptable seam strength; wherein the composition of matter comprises an interpolymer of ethylene, propylene, and at least two nonconjugated dienes, each having one reactive double bond.

Abstract: Disclosed are ambient temperature-curable roofing compositions and ambient temperature-curable sheeting compositions, both of which include an elastomer or elastomer mixture such as ethylene-propylene non-conjugated diene terpolymer, butyl rubber, and mixtures thereof. Such elastomers are cured with conventional dialkylthiourea and sulfur type curatives. Also used are conventional thiuram and dithiocarbamate type accelerators. The compositions thus produced are essentially free of hexasulfide compounds which are known to have the structural formula [(CH.sub.2).sub.n NCS].sub.2 S.sub.6, wherein "n" is 4 or 5.

Abstract: The current invention relates to the use of tetrabenzylthiuram disulfide/urea curative package for thermosetting rubber elastomers in an environmentally sound method of eliminating undesirable nitrosamines. The unique curative package synergistically increases the cure rate and physical properties of the elastomeric compound while reducing the amount of accelerator needed for vulcanization.