Talc is practically insoluble in water and in weak acids and alkalis. It is neither explosive nor flammable. Although it has very little chemical reactivity, talc does have a marked affinity for certain organic chemicals, i. E. It is organophilic. Above 900c, talc progressively loses its hydroxyl groups and above 1050c, it re-crystallizes into different forms of enstatite (anhydrous magnesium silicate). Talc's melting point is at 1500c. Coatings: talc confers a whole range of benefits to coatings. In interior and exterior decorative paints, they act as extenders to improve hiding power and titanium dioxide efficiency. Talc's lamellar platelets make paint easier to apply and improve cracking resistance and sagging. They also enhance matting. In anti-corrosion primers, talc is used to improve corrosion resistance and paint adhesion. Talc also brings benefits to inks, jointing compounds, putties and adhesives. Spec: sio2�60%, mgo�30%, cao�n1%, fe2o3: �n0.3%, k/na�n0.5%, whiteness: 95%, size: 10-20mm, 200mesh, 325 mesh or according to your request. 50kg