Dielectric Coating for Stainless Steel: Strong, Practical Choice

Summary for dielectric coating for stainless steel Discussion

Dielectric coating for stainless steel is discussed as an ESD-insulating finish for a 304 stainless sheet metal part, with a preference for flat black and low cost. Wallace White asks whether polyester powder coat is a good choice and whether other options should be considered. Tom Pullizzi does not give a direct recommendation, but asks for more details that matter to the choice, specifically whether the coating will see wear and what atmosphere or application the part is for. Later, Blake Kneedler says polyester resins used in powder coating have good dielectric strength, especially after curing with TGIC at 10 min/200C, and adds that many polymers have good dielectric strength, citing direct-current breakdown values of about 100–300 kV/cm. The thread therefore leans toward polyester powder coating as a plausible insulating finish, but the practical answer depends on service conditions and required durability.