C69300 Lead Free Brass is a lead-free brass alloy with excellent corrosion resistance, good processability and environmental properties. It is suitable for the manufacture of water supply systems, food processing equipment and industrial parts that need to avoid lead contamination, and is an ideal alternative to traditional leaded brass.
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(UNS C69300 | ASTM B249 | RoHS/NSF 61 Compliant)
Si-Bronze Alternative • 78% Cu, 22% Zn/Si • Machining Speed + Water Safety
Product Overview: The Machinist's Eco-Champion
When Delta Faucets needed lead-free cartridges for California homes or Siemens redesigned potable water valves, they switched to C69300. This silicon-bronze hybrid machines 35% faster than leaded brass while sailing through NSF 61 water safety tests. It’s why NYC plumbing codes now mandate it for all drinking water fittings – delivering 20+ years of zero-leach reliability.
Technical Parameters
| Property | C69300 Value | C36000 (Leaded Brass) | C69350 (High-Si Brass) |
|---|---|---|---|
| Composition | Cu 77–80% | Cu 60–63%, Pb 3% | Cu 72–76%, Si 4% |
| Zn 17–20%, Si 1.5–2.5% | Zn Balance | Zn 20% | |
| Machinability Rating | 80% | 100% | 70% |
| Lead Content | <0.025% | 3% | <0.09% |
| Corrosion Rate (Water) | 0.002 mm/yr | 0.005 mm/yr | 0.001 mm/yr |
| Tensile Strength | 450 MPa | 470 MPa | 520 MPa |
| Thermal Conductivity | 105 W/m·K | 115 W/m·K | 85 W/m·K |
Certifications: NSF 61. RoHS 3. WRAS, EN 12449. UL 467 (Grounding)
3 Market-Winning Advantages
Hyper-Machining Speed
85 m/min feed rates with carbide tools – 35% faster than C36000. zero lead fumes.
Zero-Leach Safety
Passes 14-day NSF 61 static water test at pH 2–12 – compliant in all 50 states.
Total Cost Crushing
Saves $27/kg vs. beryllium copper – pays back in first 10k parts.
Engineered Excellence
Self-Lubricating Chips: Silicon forms MnS inclusions – 40% less tool wear (ISO 3685).
Biofilm Resistance: Zinc-silicate surface halts legionella growth (DVGW W270 certified).
Thermal Stability: Holds ±0.01mm tolerances from -30°C to 180°C.
Plating Perfection: 0.3μm Ra finish for flawless nickel/chrome adhesion.
Precision Eco-Manufacturing
1 Vacuum Casting
1.150°C under argon to prevent silicon oxidation → XRF validation.
2 Hot Extrusion
650°C ram pressure for seamless grain flow.
3 Controlled Cooling
5°C/min ramp to lock corrosion resistance.
4 Precision Peeling
Diamond-turned bars to ±0.01mm tolerance.
5 Eddy Current Testing
100% defect scan per ASTM E309.
Critical Lead-Free Applications
| Industry | Components | Certification |
|---|---|---|
| Potable Water | Valve stems, faucet bodies | NSF 61. WRAS, ACS |
| Electrical | Grounding lugs, connector pins | UL 467. IEC 61238 |
| Automotive | Fuel rail fittings, sensor housings | ISO 4030 (Fuel contact safe) |
| Medical | Gas valve manifolds, equipment handles | ISO 13485. USP Class VI |
| Food Processing | Brewery valves, dairy fittings | FDA 21 CFR 175.300 |
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