Paraffîn
Cymysgedd o hydrogarbonau a geir trwy ddistyllu olew crai yw paraffîn (enw amgen: cerosîn).
Mae'n berwi ar dymheredd o rwng 150-300 gradd selsiws ac mae ganddo dwysedd cymharol o 0.78-0.83, yn dibynnu ar ei buredd. Defnyddir paraffîn fel tanwydd ar gyfer y cartref ac mewn rhai peiriannau.
Gwêr baraffîn
Gwêr a geir wrth ddistyllu olew crai yw gwêr baraffîn. Mae'n cael ei defnyddio ar raddau eang i wneud papurau arbennig (waxed papers), canhwyllau a pholis.
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