As the largest and most professional Sulphide manufacturer in Asia,Shandong Efirm Biochemistry and Environmental Protection Co.,Ltd is a real manufacturer especially product Thiourea 99% min and Sodium Hydrosulfide.It will become list company in the year of 2015.Although it was founded in Jan 2011,we have started to product Thiourea under our Group since the year of 2003. Thiourea 99% purity min is usually used as Pharmaceutical Intermediates,Gold Mining floating,Making Pesticide,Electrofacing Cleaning Chemical,Rubber making,Textile Auxiliaries Agent etc. Now the actual capacity of Thiourea 99% is 30,000MT per year,and will soon reach to 50,000MT next year. Sodium Hydrosulfide is is divided into three categories,the Liquid purity is from 32% to 48%,the Solid purity is from 70% to 98%,the F..