... coal. widely used for gas/air/water purification. CG4050,CG4060,CG3050,CG3060 are pelletized activated carbons made of selected virgin coal. Produced under high ... such as sodium hydroxide and potassium hydroxide, carbon dioxide, hydrogen, nitrogen, acetylene, chlorine, ... . For external analysis methods, please refer to ASTM STANDARD FOR ACTIVATED CARBON & AWWA STANDARD FOR ACTIVATED CARBON.Packaging ...