... is 4.0-4.6, do not dissolve in water, acid ,alkali and other solvents, resist heat, acid and alkali, non-toxic and can ... be used in paints, ceramics, batteries, enamel, paint, coatings, and so on. BaSO498%minWater Soluble0.016%maxAcid Soluble0.042% maxIron ... (Fe)0.003% maxSiO20.162% maxMoisture0.15% maxPH6.9 maxOil absorption11.6% maxParticle sizeMesh 40082 % min