Specification :

perfluorobutylsulfonylfluoride
CAS No. : 375-72-4
Formula: n-C4F9SO2F
Molecular Weight: 302.1
Appearance: colorless or slightly yellow liquid
Proportion ( d20D) : 1.700-1.750
Refractive index ( n25D) : 1.2810
Boiling point: 65-66 
pH: 3.8-4.8
Content: e 98%
Application: It is the homologue of perfluorooctylsulfonylfluoride and can be used to synthetize various of special perfluoro surfactants. Its potassium salt is an excellent anion surfactant and fire retardant for polycarbonate.