FC-98 (potassium perfluorobutanesulfonate) Structure formula: CF3CF2CF2CF2SO3K Molecular formula: C4F9SO2K Molecular weight: 338.2 CAS No: 2795-39-3 Content: 95%Appearance: white to yellowish powder Melting point: 300癈 Package: 20?00g per plastic bottle in carbon Storage and shipment: general chemicals Application: It is an anion surfactant and widely used in retarding inflammation for synthetic materials, especially for the polycarbonate.