Custom Mix Alkane, Alkene and Aromats 3 15 components, volume procent neat 1231.5 Isopentane 0.25% 3015.5 Pentene-1 0.50% 1299.5 n-Pentene-l 1.25% 1234.6 2,2-Dimethylbutane 1.00% 1250.5