Hexamine( urotropine) Item Index Excellent First-class Qualified Purity % e 99.3 99.0 98.0 Waterd 0.5 1.0 Ash % d 0.03 0.05 0.08 Appearance in aqueous solution Clarity of qualified - Heavy Metal( on Pb) % d 0.001 - Chloride( on CL) % d 0.015 - Sulfate( on SO4) % d 0.02 - Ammonium salt of( on NH4) % d 0.001 - albert ( Sales Manager) online Skype: lisa_geng518 alibaba: cn220113285 Company: hebei yuhang chemical industry co., ltd. Address: East of xisun building , lingshou town , bebei, china Tel: 0086-311-66682568 0086-15930416889 Fax: 0086-311-66682568 Email: lisageng88815 at gmail dot com