1. Stainless steel and copper black oxidation comply with national standards: SGS, U.S. military standard MIL-C-13924, and meet the following criteria for appearance and corrosion resistance: GB/T 15519-2002, Ordnance Industry Standard WJ535-82, and German standard DIN 50938. Wear resistance exceeds the requirements of Q/OJS0001-1995. These products are used in medical devices, critical mechanical components, defense‑industry machinery, and sporting equipment. [Lens Hood]

　　2. Composite hardening treatment is primarily used for surface hardening and corrosion protection of precision electronic components and metal parts. This technology is capable of treating highly precise, easily deformable electronic devices, metal components, molds, and mechanical parts, with controllable deformation within 4 µm. It is a non‑deforming hardening process that offers excellent corrosion resistance.

　　3. Stainless steel and copper aperture rings for digital cameras, mobile phones, in-vehicle surveillance lenses, and similar applications feature dimensional tolerances of ±0.005 mm and concentricity within ±0.01 mm. These components are developed and manufactured using advanced Japanese technology, employing ultra-thin stainless steel and copper materials. A specialized process is applied to the aperture blades, providing a unique optical tinting and matte finish that ensures excellent electrical conductivity, complete light blocking, double-sided frosted surfaces, precise dimensions, superior mechanical properties, outstanding thermal stability, and high‑temperature resistance. Stainless steel and copper lens aperture rings are primarily used in precision optics with resolutions exceeding 3 megapixels; they are indispensable for next‑generation high‑definition lenses and represent an ideal upgrade over conventional PE‑based products. [Aperture Ring]

　　4. QPQ employs the latest U.S. technology, resulting in products that require no sandblasting, retain their shape, boast a superior glossy finish, and exhibit significantly enhanced wear resistance and corrosion protection. The quality is outstanding, setting it well ahead of industry standards. [Lens Hood]

　　5. In particular, our blackening treatments for copper and stainless steel, as well as QPQ salt‑bath processes, all employ the company’s latest technologies, offering low costs, superior quality, and processing fees that are 20% to 80% lower than those of industry peers. (Our products are currently exported to overseas markets including the United States, Germany, Japan, South Korea, and others.)

　　6. Matte blackening and satin black finishing of stainless steel strips; sandblasting of various workpieces; shot blasting and polishing of aluminum parts.