Bis Certification For K Acid (2-Naphthylamine-3 : 6 : 8-trisulfonic acid) BIS Certification for K Acid as Per IS 11557:1986. K Acid, also known as 2-Naphthylamine-3: 6: 8-trisulfonic acid is a water soluble, stable compound with a sulfonic acid functional group. and also, major use of K acid as a catalyst for the removal of chlorides and sulfates from wastewater. IS 11557 In this standard IS 11557:1986 outlines the quality, safety and compliance of K Acid to industry standards. Manufacturers must obtain a license from the Bureau of Indian Standards (BIS) and display the standard mark (ISI Mark) on their K Acid products. Contact BIS Consultant Aleph India to know the BIS Certification process for K Acid.