Heat Sinks & Electrical Contacts

Tungsten-copper shows up in two more places buyers often ask about: heat sinks for semiconductor and power-device packaging, and arc-resistant contacts for high-voltage switchgear. Both are real applications — but they are dominated by high-tungsten grades (80% W and above), which sit inside China's dual-use export-control descriptions.

Our export range stops below that line. For contact-side needs in lower-tungsten compositions — for example W/Cu 70/30 arc-quenching components in medium-voltage equipment — we can quote to drawing after a composition check. For semiconductor heat sinks in ≥80% W grades, we decline politely and refer you on. Keeping this boundary clear is what lets every order ship through routine customs, with no export-license delays on your side.

• HV & MV contacts

  Arc-erosion resistance makes W/Cu a proven contact material; lower-W compositions are checkable case by case.

• Semiconductor heat sinks

  Mainstream grades are ≥80% W — outside our export range and inside export-control descriptions.

• The 80% line

  We supply sub-80% tungsten alloys only: routine customs, no license delays, predictable delivery.

• Ask anyway

  Not sure where your composition falls? Send the spec — we answer within 24 hours.