We want to buy large quantity of sulfur monthly, and wish to find good honest suppliers, if you can provide, plz contact with us! The specification we required as follows: Purity: 99. 8% min Moisture: 0. 5% max Carbon: 0. 02% max Ash: 0. 02% max Acid: 0. 02% max Color: bright yellow Form: granular Purity: 99. 5% min Moisture: 0. 5% max Carbon: 0. 02% max Ash: 0. 02% max Acid: 0. 02% max Color: yellow Form: lump Wish to receive your letter as soon as possible