Overview
4mm lead wire is a standardized diameter of pure or alloyed lead wire used in industrial applications. Its 4mm thickness offers an optimal balance between flexibility and structural integrity for various technical uses. This product typically contains 99.9% pure lead, though some specialized versions may include small amounts of antimony or tin for enhanced mechanical properties. Lead wire has been used for centuries due to lead's unique combination of properties, but modern manufacturing processes now produce wire with consistent diameters and surface finishes. The 4mm size is particularly popular in construction and shielding applications where moderate thickness is required without sacrificing workability.
Physical and Chemical Properties
The 4mm lead wire exhibits typical metallic lead characteristics with a density of 11.34 g/cm³, making it one of the densest common metals. This high density contributes to its effectiveness in radiation shielding applications. The wire is soft (Mohs hardness of 1.5) and can be easily bent or shaped without specialized tools. Chemically, lead is relatively inert at room temperature, forming a protective oxide layer that prevents further corrosion. However, it reacts with acids and certain organic compounds. The wire maintains dimensional stability across a wide temperature range, with a melting point of 327.5°C. Its electrical conductivity is approximately 7% that of copper, sufficient for certain specialized electrical applications.
Main Applications
Radiation shielding represents the primary use for 4mm lead wire, particularly in medical facilities and nuclear applications. The wire can be woven into flexible shielding curtains or used to seal gaps in fixed shielding structures. In construction, it serves as sealing material for expansion joints in masonry and as counterweights in windows. The electrical industry utilizes 4mm lead wire for grounding systems and as fusible elements in some specialty electrical devices. Craftsmen value this size for stained glass work, where it provides structural support while remaining malleable enough for detailed shaping. Some automotive and marine applications employ it for vibration damping and corrosion-resistant fasteners.
Safety and Storage
Proper handling of 4mm lead wire requires awareness of lead toxicity. Workers should wear gloves and avoid creating dust or fumes through abrasion or heating. Work areas should be designed to facilitate regular cleaning, and eating/drinking should be prohibited in processing zones. Storage recommendations include keeping the wire in its original packaging until use, preferably in a dry, cool environment. For long-term storage, wrapping the wire in acid-free paper can prevent surface oxidation. Bulk storage should be organized to prevent deformation of the soft metal, with heavy coils supported on pallets rather than stacked directly on each other.
B2B Procurement Guide
When sourcing 4mm lead wire commercially, buyers should specify purity requirements (typically 99.9% or 99.99%), surface finish (bright or oxidized), and packaging preferences (coils, spools, or straight lengths). Minimum order quantities often range from 100kg for standard purity to 500kg for bulk discounts. Quality verification should include certificates of analysis for purity and dimensional tolerance checks. For international shipments, ensure compliance with local regulations regarding lead product transportation. Some manufacturers offer custom alloy formulations or special tempers for specific applications, though these typically command premium pricing and longer lead times.
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