1.1 ,These test methods provide two procedures for the determination of the moisture content of activated carbon.2 The procedures may also be used to dry samples required for other tests. The oven drying method is used when water is the only volatile material present and is in significant quantities, and the activated carbon is not heat sensitive (some activated carbons can ignite spontaneously at temperatures as low as 150 ,°,C). The xylene extraction method is used when a carbon is known or suspected to be heat sensitive or to contain nonwater-miscible organic compounds instead of or in addition to water. The oven drying method described in these test methods may be used as the reference for development of instrumental techniques for moisture determination in activated carbon.