The hexamine we are producing is not added with antiblockingagent.But it is not easy to block for a long time. We have had an experiment In the stock.Tempriture is 20 degree, and moisture is 30% .8 bags in a roll. THe hexamine is not caked at all after 7 months. Although after the factory adding the antiblockingent, the hexamine can be stocked for about 18 months without caking.The content will be lower. HEXAMETHYLENETETRAMINE ( HEXAMINE) is a white crystalline powder with slight amine odor. Applications: Vulcanizing agent and rubber blowing agent, used as a dye fixative and in the preservation of hides.Smokeless pellets. Stabilizer for oils and synthetic resin, Surface treatment, Vulcanizing rubber. Additives in deodorizing powder. Anti-corrosive agent in steel. Absorption of poisonous gases. Anti-caking agent for prilled urea. Disinfectant. Antibacterial agent. Explosives ( RDX) , ( HMX) , ( HMTA) . Content: e99.3% Moisture: d0.30% Ash: d0.03% Apparent of liquor: clarity Heavy metal( in Pb) : d 0.001% Chloride( in CI) : d0.015% Sulfate( in SO ) : d 0.02% Ammonium( in NH4) : d 0.001%