The rubber (elastomer) is the major component and other components are given as weight pre hundred weight rubber (phr)
- Sulfur is added in less than 10 phr
- Accelerators and activators with the sulfur:- Hexamethylene tetraamine (HTMA)
- Zinc oxide as activators
- Protective agents are used to supress the effects of oxgen and ozone.
Phenyl betabaphthylamine and alkyl paraphenylene diamine (APPD)
- Reinforcing filler:- Carbon black
- Silica when light colors are required
- Calcium carbonate, clay, kaolin
- Processing aids which reduce stiffness and cost
- Plasticizers, lubricants, mineral oils, paraffin waxes
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