Refined gold bar ZlA-3, GOST 28058-2015

Refined gold bar ZlA-3 per GOST 28058-2015 has a mass fraction of Au not less than 99.95% and total impurities not more than 0.05%. The grade sits between ZlA-2 and ZlA-4 in overall impurity level. Conformity is confirmed by the manufacturer’s certificate.

Confirmed specifications

• Metal: refined gold
• Grade: ZlA-3
• Gold: not less than 99.95%
• Total impurities: not more than 0.05%
• Standard: GOST 28058-2015 with current amendments

Item number — 5203440. Actual values are confirmed by the batch quality document.

Purpose and applications

• calculation and preparation of charge for gold-containing alloys;
• remelting into blanks for subsequent rolling, drawing, or processing;
• production and research processes with incoming metal analysis;

Quality control

Per the standard, the bar shape is a truncated pyramid with bases 254±5 by 88±5 mm and 229±5 by 59±5 mm; height 35±8 mm. The mass range is 11,000–13,300 g. Permissible deviations by agreement must be reflected in the documents. Each bar is checked for mass, surface condition, and marking; a batch is formed from a single melt.

What to agree before ordering

Agree on mass, quantity, individual impurity limits, and the final process. Obtain a certificate with melt number, grade ZlA-3, actual gold content, analysis results, and bar identifier. For alloy production, specify the target fineness and account for impurities in the source metal. If a cut-to-size format or special certification is required, specify the relevant standard separately.

Storage and handling

The bar should be stored in protected and controlled packaging that prevents contamination, impact damage, moisture, aggressive media, and sulfur compound vapors. Do not damage stamps or traceability. Weighing, sampling, and transfer are performed with documentation. All processing products, including chips, samples, and residues, are collected for accounting and subsequent return.