Tokyo: NIPPON KINZOKU CO., LTD. (Headquarters: Minato-ku, Tokyo) is pleased to announce the launch of its fourth environmentally-friendly 'Eco-Product' series, STA (Special Tension Annealing) finish stainless steel, which eliminates warping and refines crystal grain size for high-definition etching.

According to BERNAMA News Agency, in the etching process, particularly in the half-etching process, spring material warping has been an issue. STA finish greatly reduces this warping, dramatically improving dimensional stability.