The rate of diffusion is directly proportional to temperature; and The rate of diffusion is indirectly related to molecular weight (heavier particles move more slowly than lighter, smaller ones). At room temperature, the average velocity of a molecule is fast-about 2 km/sec (=3997 mph!).
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Buna-N is a commonly used elastomer. Buna-N is also known as Nitrile rubber, NBR or Perbunan.It is synthetic rubber copolymer of acrylonitrile(ACN) and butadiene.Elastomer is natural or synthetic material which does not break when stretched and when released it return to its original length.NBR,an improved version of Buna-N,is used for hoses,rubber belts,sealing parts,special purpose article in oil well,reciprocating oil seal,rubber seal,gaskets,roll covers,shoe soles,varieties molded part for shoe heels and O-rings. XNBR is specially used for modification of the adhesives and epoxy resin.