Weight %. Bismuth provides the free-cutting chip-breaker in place of lead. Broad family range — confirm your exact grade limits on the mill certificate.
| Element | Symbol | Min % | Max % | Typical % |
|---|---|---|---|---|
| Copper | Cu | 57.0 | 64.0 | ~61 |
| Zinc | Zn | Balance | ~36 | |
| Bismuth ✓ | Bi | 0.5 | 4.0 | ~2.0 |
| Tin | Sn | 0.1 | 3.0 | ~0.5 |
| Lead (max) ✓ | Pb | — | 0.10 | ≤0.05 |
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength (Rm) | temper BD, min | ≥315 | MPa |
| Yield Strength | temper-dependent | ~120–250 | MPa |
| Elongation (A) | temper BD, min | ≥5 | % |
| Hardness | temper BD, min | ≥75 | HV |
| Machinability | comparable to leaded | ~90% | — |
| Density | — | 8.41 | g/cm³ |
| Thermal Conductivity | typical | ~115 | W/(m·K) |
| Melting Range | solidus–liquidus | 885–900 | °C |
| Standard | Designation |
|---|---|
| Designation | C6802 — bismuth brass |
| Family | Cu-Zn-Bi lead-free free-cutting brass |
| Substitute for | leaded brass CW614N / CW617N (lead-free parts) |
| Other lead-free brasses | CW724R / C69300 (silicon) |
| Lead | ≤0.10% — RoHS compliant |
C6802 is a lead-free bismuth brass — bismuth replaces lead as the free-cutting chip-breaker, keeping lead at or below 0.10% (RoHS-compliant). It is a drop-in lead-free substitute for leaded machining brasses where finished parts must be free of lead.
C6802 supports NSF/ANSI 61 certification for potable water contact and meets the NSF/ANSI 372 weighted-average lead limit of 0.25%, making it the natural choice for fittings destined for the US and Canadian markets. Final NSF 61 listing applies to the finished product, which the buyer or brand owner registers.
Both are lead-free but different families: C6802 is a bismuth brass (bismuth chip-breaker), while CW724R (CuZn21Si3P) is a silicon brass with higher strength and intrinsic dezincification resistance. Choose by your drawing's specified grade and approvals; Brassland machines both against your drawing.
Yes — fully, with no exemption needed, since lead is at or below 0.10%. That also future-proofs parts against the tightening of RoHS Exemption 6(c) expected after June 2027.
The lead-free bismuth brass, made to your drawing. ISO 9001:2015. Quote within 24 hours.
Request a QuoteComposition ranges, mechanical properties, machinability ratings and regulatory data on this page are cross-referenced against the publishers below. Tolerances and minimum values are taken from the relevant published standard at the time of writing — for procurement specification, always reference the current published edition.
Last reviewed: June 2026. EN/ISO/ASTM standards are updated periodically. This datasheet reflects the editions listed; for safety-critical or contract-critical applications, always verify against the current published edition of the standard. For project-specific deviations or supplier-specific composition windows, request a Type 3.1 mill certificate (EN 10204) with your order.