heated in a roller mill silica sand

ASTM International : Withdrawn Standards- heated in a roller mill silica sand ,Withdrawn Standards A4- Withdrawn 1965: Specification for Medium-Carbon-Steel Splice Bars A5- Withdrawn 1979: Specification for High-Carbon Steel Joint BarsPipe Coating: Pipecoating Part 1 · The equipment required for checking the relative humidity is a Whirling Hygrometer a two disc calculator and calibrated digital thermometer. The Whirling Hygrometer contains two thermometers, one for wet temperature and one for dry.