Differentiate between buna-n and buna-s.

BUNA-N and BUNA-S are polymers

BUNA-N monomers are 1,3-butadiene and acrylonitrile

it is also called as Nitrile-Butadiene-Rubber. It is a copolymer of butadiene and acrylonitrile

Cyanide ion in acryl group enhances the oil and solvent resistance hence the oil resistance is determined by the amount of acrylonitrile

it is used in seals, belts, oil seals etc and also used for making synthetic leather and footwear

It is a commercial name for NBR

BUNA-S monomers are 1.3-butadiene and styrene

It is also called Styrene-Butadiene Rubber

It has slightly less tensile strength than natural rubber

it is used for making automobile tyre and rubber soles

its commercial name is SBR


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