ABC or Multi-Purpose extinguishers utilize a specially fluidized and siliconized mono ammonium phosphate dry chemical. It chemically insulates Class A fires by melting at approximately 350°F and coats surface to which it is applied. It smothers and breaks the chain reaction of Class B fires and will not conduct electricity back to the operator. 6-Year Manufacturer's Warranty Stored Pressure Design Dependable Drawn-Steel Cylinders Durable High-Gloss Polyester Powder Paint All-Metal Valve Construction Temperature Range -65°F to 120°F