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Amerex 20lb ABC or Multi-Purpose fire extinguishers utilize a specially fluidized and siliconized mono ammonium phosphate dry chemical. It chemically insulates Class A fires by melting at approximately 350åÁF and coats surfaces 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. Available in Wheeled and Stationary extinguishers.