Spring + conductive. Non-sparking. High-reliability.

Finished BeCu parts are completely safe to handle — beryllium is bound in the metal and does not leach. The hazard is only during machining: beryllium-containing dust and chips are potentially toxic if inhaled. Our BeCu machining area: dedicated HEPA dust collection, wet machining (flood coolant) prevents airborne particles, containerized chip handling, proper PPE. We machine BeCu routinely with established safety protocols — no risk to customers.

BeCu is expensive — $60-120/kg vs $8/kg for brass. Justified when: (1) spring + electrical combination genuinely needed (connectors, high-cycle contacts), (2) non-sparking required (Ex-rated atmospheres — no substitute), (3) non-magnetic + strong (medical MRI-compatible hardware, precision instruments), (4) high-conductivity spring (welding electrode tips, mold cores for thermal management). For pure spring applications, steel is cheaper. For pure electrical, copper or brass is cheaper. BeCu wins only in combined-property applications.

Optimal sequence: (1) Solution anneal at 800 °C + water quench (supplied condition "TB00"). (2) CNC machine to final dimensions — easy to machine in soft temper. (3) Age harden at 315 °C for 2-3 hours to reach TH04 temper (40-45 HRC). Dimensions grow 0.1-0.3% during aging — account for this in machining dimensions. Resulting properties: spring temper with high conductivity and fatigue resistance.

BeCu tools meet "non-sparking" classification per ATEX and IEC Ex standards for use in Zone 1 and Zone 2 explosive atmospheres. The copper matrix doesn't produce incendive sparks when struck against steel or concrete. Standard for tools used in oil refineries, chemical plants, gas distribution, grain elevators, coal mines. Note: BeCu tools are softer than steel — wear faster, but that's acceptable for safety-critical applications.

C17200: 22% IACS conductivity, 1380 MPa yield. Standard for springs and connectors. C17510: 50% IACS conductivity, 820 MPa yield. For applications where conductivity matters more than max strength (welding electrodes, high-current contacts, mold cores for fast cooling). Rule of thumb: C17200 for springs/contacts, C17510 for thermal/electrical conductors.

BeCu availability: 3-4 week lead time for standard C17200 bar stock. C17300 free-machining: 2-3 weeks. C17510: 4-6 weeks. Heat treatment adds 5-7 days. Total typical BeCu project: 6-8 weeks from PO to shipping. Plan accordingly for BeCu-critical designs.