Gold contact part Zl 99.9 per GOST 25852-83

This is an electrical contact part made of gold grade Zl 99.9. The product form is confirmed by the name, category, and scope of GOST 25852-83, but the specific configuration is not provided in this listing.

Product type

Zl 99.9 differs from Zl 99.99 in the minimum gold content, so the listings are not duplicates. GOST 25852-83 has been superseded by the 2021 edition; requirements between them are cross-checked.

Characteristics

• Type: electrical contact part
• Grade: Zl 99.9
• Document status: GOST 25852-83 superseded by GOST 25852-2021
• Document: GOST 25852-83; current superseding document — GOST 25852-2021

A contact part is a technical element finished in geometry, not just a piece of gold. Operating parameters depend on shape, dimensions, mass, surface, mounting method, and switching mode. Grade Zl 99.99 or Zl 99.9 defines the material but does not allow selecting a contact without specifying the configuration and drawing. The supply document is GOST 25852-2021.

Applications

• contact parts for instruments and switching apparatus per working drawing;
• assemblies with specified mounting method and control of working surface;
• contact replacement only when grade, geometry, and electrical mode match;

What to coordinate when ordering

Request the designation, drawing, dimensions, mass, roughness, tolerances, and surface acceptance criteria. Specify mounting, operating mode, quantity, and packaging. The passport records Zl 99.9 and analysis. Separately confirm the GOST edition and compatibility with equipment documentation.

Safety and storage

Contact parts are protected from contamination of the working surface, scratches, and deformation. Mounting is performed with clean tools and eye protection; soldering, welding, or mechanical fastening is done per approved procedure. Do not test the contact under voltage outside the intended circuit. Scrap and rejected parts are collected separately, and packaging and storage are organized per supply document and precious metals accounting rules.