Opex 80 Dinitrosopentamethylene tetraamine Crompton-Uniroyal Chemical Surfactants Surfactants >> Amines Chloroprene Rubber (CR) Rubber - Elastomer (Chloroprene, Butyl …) OPEX ® 80 Chemical Foaming Agent dinitrosopentamethylene tetramine (DNPT) Treated urea (BIK ® OT), phthalic anhydride (Retarder ESEN ® ), hydrazide foaming agents (Celogen ® OT), mercaptides (Naugex ® MBT) and peroxides. Nondiscoloring and nondiscoloring. Vulcanizates have a characteristic odor that dissipates somewhat with time. Chemical foaming agents for sponge rubber and expanded plastics applications which require closed cell structures. Especially effective in press-precured SBR, Neoprene, natural rubber and EPDM (Royalene ® ). Opex® 80 is an 80% active nitrogen foaming agent for both open and closed cell elastomeric sponge rubber. Decomposes in air at 190ºC (374ºF) but in the presence of promotors decomposes at temperatures as low as 120ºC (248ºF). Typical applications are in microcellular soles and molded sponge of natural, SBR, Neoprene and other elastomers. Nondiscoloring and nondiscoloring dinitrosopentamethylene tetramine (DNPT). Used as a chemical foaming agent for sponge rubber and expanded plastics applications which require closed cell structures. Possesses good efficiency in press-precured SBR, neoprene, natural rubber and EPDM. Can be activated by treated urea, phthalic anhydride, hydrazide foaming agents, mercaptides and peroxides.