We are interest to import C4 (N-Butane) and Propylene for our local market. The detailed specification as below. 1. Product Name: N-Butane Chinese Name: C4 Molecular Formula: C4H10 Appearance: Compressed liquefied gas PROPERTIES: Charactor: Colorless Flammable Gas Melting Point:−138.432 °C Boiling Point: −0.522 °C Liquid Density:600 g/l (0 °C, 1 Atm) Critical Temperature Is 152.0 ° C Critical Pressure 3796.0 Kpa Critical Volume Of 255ml / Mol 2. Product Name: Propylene Molecular Formula:CH2=CHCH3 CAS NO.: 115-07-1 PROPERTIES: Charactor: Appearance: Colorless, slightly sweet gas Molecular Weight:42.081 Melting Point:−191.2 °C Boiling Point: −47.4 °C Liquid Density:0.5139g/cm3(20/4u2103) Please contact us for more detailes. Thanks and regards. Calvin Show More