Nickel Plated Chains : These chains are ideal for use in light corrosive atmosphere or where good appearance is required. Zinc Plated Chains : These chains are used in corrosive atmosphere and outdoor applications. ZAC Chains : Excellent corrosion resistance with same strength and breaking load values as standard chains. The chains are designed to withstand a minimum of 250 hrs of salt spray testing as per ASTM B 117.