Import Doped Tungsten Wire For Lamp Filament — Buy in Bulk from Supplier in China

Doped tungsten wire for lamp filament is a dispersion-strengthened material produced by introducing K-, Si-, and Al-compounds (AKS) into tungsten powder before drawing, creating a stable internal microstructure that resists deformation at high operating temperatures. This product is available in grades W91, W61, W31, and WR15, as specified by the supplier, and is engineered for use in incandescent and halogen lamps where thermal stability is critical. The wire retains dimensional integrity under prolonged exposure to temperatures exceeding 2000°C, a key requirement for filament longevity.

The material composition follows standard non-sag tungsten practices, with dopant levels typically ranging from 10 to 20 ppm potassium, consistent with industry norms for lamp-grade tungsten. Wire diameters are drawn to tight tolerances, commonly between 15 and 50 micrometres, with surface finish critical to prevent hot spots and premature failure. The production process includes powder metallurgy, extrusion, swaging, and precision drawing, all conducted in controlled atmospheres to avoid contamination. Oxidation resistance is inherent due to the dopant-induced grain structure, reducing the need for additional coatings.

This wire is purchased primarily by manufacturers of household and industrial lighting systems, particularly in regions with high demand for energy-efficient filament lamps. Buyers typically require consistent resistivity, uniform diameter, and low impurity content to ensure batch-to-batch reliability in automated filament winding machines. Trade terms are negotiable, with FOB Weihai port common. Packaging is in sealed, nitrogen-purged containers to prevent oxidation during transit. MOQ and lead time must be confirmed directly with the supplier.

Weihai Multicrystal Tungsten & Molybdenum Technologies Co., Ltd. operates a full production line for doped tungsten wire, from powder preparation to final wire drawing, based in Weihai, Shandong Province, China. The supplier is verified as a harbor-tier trading entity with no public disclosure of production volume, employee count, or years in operation. The listing confirms capability in manufacturing non-sag tungsten wire under the W91, W61, W31, and WR15 grades but provides no evidence of third-party certifications, client lists, or export history.

The company's profile does not include details on R&D capacity, testing equipment, or quality control protocols beyond the stated production process. There are no claims regarding ISO certification, environmental compliance, or client-specific approvals. Buyers should request documentation for material traceability and batch testing results directly. Response rate and average reply time are not recorded on the platform, indicating limited engagement with inquiries.