For an elastomer, its compatibility with a fuel is estimated by its
solubility in the fuel. In practice, the extent of compatibility is measured
by the volume swell of the elastomer [9]. Various studies
have been conducted to investigate the compatibility of materials
in biodiesel. Haseeb et al. [10] and Trakarnpruk et al. [11] investigated
the effects of palm biodiesel on different kinds of elastomers.
They found that all kinds of elastomers experienced degradation
when immersed in biodiesel at room temperature. The compatibility
of the elastomers in palm biodiesel decreases in the order of silicone
rubber, NBR, EPDM and CR, with silicone rubber being most
compatible. AI-Lal et al. [12] also studied the compatibility of three
types of materials present in the modern airplanes with blends of
biokerosene composed of fatty acid methyl esters (FAMEs) and Jet
A-1. NBR are copolymers of polyacrylontrile