On August 5, 2025, Jiangsu Yongjin Metal Technology Co., Ltd. obtained a patent for "A food-grade stainless steel material for straws and its preparation process," with publication number CN120425423A.

The patented technology involves applying a dual-layer protective coating to the stainless steel. It uses a silver-plating solution with a specific polymer to increase scratch resistance. Additionally, an antibacterial coating is applied, containing a compound of quaternary ammonium salt, tea polyphenols, and nanosilver. This combination provides a broad-spectrum, high-efficiency antibacterial effect, making the material highly durable and sanitary for food-grade applications such as straws.