Hexamine first grade not adding with antiblocking agent

We are Manufacturer and always supplying Hexamine first grade not adding with antiblocking agent CAS NO 100-97-0 with competitive price,high quality and regular basis. Hexamine we are producing is not added with antiblockingagent.But it is not easy to block for a long time. Specification of Hexamine Content: ≥99.3% Moisture: ≤0.30% Ash: ≤0.03% Apparent of liquor: clarity Heavy metal(in Pb): ≤ 0.001% Chloride(in CI): ≤0.015% Sulfate( in SO４): ≤ 0.02% Ammonium(in NH4): ≤ 0.001%