... the air.2.Specification: N…………………………………………min 20.5%Moisture…………………………… … max 1.5%Free acid……………………………….. max 0.05% Appearance………………………granularSize…………………2 ... industry ,pharmaceuticals, textiles,welding industry,dyeing auxilizries of acid dyes,deliming agent of leather,beer making,chemical ... moisture, water, rain and fire. Avoid shipment with acid, alkali class, edible orange mix of chemicals. Common ...