Gold microwire Zl 99.99 in silver sheath, TU 48-1-786-88

This item is a composite microwire: gold material grade Zl 99.99 is encased in a silver sheath. This configuration is explicitly specified in the TU and the manufacturer’s catalog.

Product type

The silver sheath is part of the construction. The overall diameter, layer thickness, gold fraction per unit length, and sheath processing method are not specified; these parameters cannot be determined from a typical photograph.

Characteristics

• Type: microwire in silver sheath
• Core material: gold Zl 99.99
• Gold: not less than 99.99% by mass in the gold material
• Document: TU 48-1-786-88 «Gold microwire in silver sheath»

The wire is a continuous semi-finished product; its intended use depends on diameter, cross-section shape, material condition, and surface quality. The Zl 99.99 purity does not convey these parameters nor confirm suitability for a specific bonding operation. For microwire, tolerances, lengthwise uniformity, tensile properties, and winding requirements are especially critical.

Applications

• precision conductive elements for which the composite structure is specified;
• process drawing or further processing only within the limits of the TU requirements;
• laboratory evaluation of bonding and sheath behavior before series production;

What to specify when ordering

Request the overall diameter, gold core diameter, silver sheath thickness and uniformity, tolerances, and delivery condition. Specify mass or length, spool, continuous length, strength, and elongation. For assembly, confirm whether the sheath is retained, how the joint is made, and how composition is verified after processing.

Safety and storage

Unwind the wire without sharp kinks or surface contamination. Thin ends can injure skin and eyes, so use safety glasses, gloves, and appropriate tools. When soldering or thermocompression bonding, control heated parts and flux residues. Collect offcuts and broken pieces separately; store and account for them according to regulations for precious metal products.