... not soluble in water, soluble in smoking Sulphuric Acid, slightly soluble in boiling Hydrochloric Acid. Chemical property is stable, itll reduce to ... with PE bag.Usage: It can be used as filler for paint, printing ink, rubber, plastic, insulating tape, surface ... and copper plate. Sizing agent for textile. It also can be used in pigment, porcelain, storage battery, porcelain enamel, glass and flavor ...