CZ101 / CW501L Gilding Brass
CW501L / CZ101 is an alpha brass consisting of approximately 90% copper and 10% zinc. Also known as Gilding Metal the CW501L / CZ101 is primarily offered as a sheet grade due to its excellent cold working properties.
The make-up of CW501L / CZ101 means it is not generally susceptible to dezincification or stress corrosion and due to its formability and its attractive rich golden colour it is widely used for architectural and decorative applications. It is also readily enamelled, soldered and brazed.
CZ101 CW501L Gilding Brass
Electrolytic Tough Pitch Copper (ETP) C101 / CW004A is a commercially pure high conductivity grade of copper refined by electrolytic deposition which is then melted and oxidised to the “tough pitch” condition with a controlled low oxygen content. This is the most widely used of all the coppers because of its combination of electrical and thermal conductivity, corrosion resistance, workability and aesthetic beauty.
C101 / CW004A is the normal grade for general electrical use as busbar, motor and transformer components, windings and many other current carrying applications. It is also very popular with architects for applications where the corrosion resistance is required for building applications. Over time the C101 will also develop the weathered
copper, green patina, appearance that offers additional corrosion resistance and a desirable look.
The use of this alloy in elevated temperature environments can be limited due to oxygen being present in the form of Cu2O. This can cause the alloy to be susceptible to hydrogen embrittlement in reducing gasses or when welding or brazing using an oxy-fuel gas flame.
Related Specifications
| CW501L | BS2870: CZ101 |
| C22000 | CuZn10 |
Chemical Composition
| Copper | 89.0-91.0% |
| Lead | 0.05% max |
| Iron | 0.10% max |
| Zinc | Rem |
| Others | 0.40% max |
Key Features
- Excellent cold formability
- High resistance to stress corrosion and dezincification
- Excellent base metal for vitreous enamelling
Typical Physical Properties
| Melting Point | 1045°C |
| Density | 8.80 g/cm³ |
| Specific Heat | 376 J/Kg°K |
| Thermal conductivity (RT) | 188 W/m°K |
| Thermal expansion coefficient (20-200°C) | 18 x 10-6 / °C |
| Electrical conductivity | 44 % IACS |
| Electrical Resistivity | 0.039 ohm mm2/m |
Fabrication Properties
| Hot Working Temperature Range | 750-900°C |
| Hot Formability | Good |
| Cold Formability | Excellent |
| Cold Reduction Between Anneals | 90% |
| Machinability rating
(free cutting brass = 100) |
25 % |
| Annealing Temp. Range | 425-600°C |
| Stress Relieving Temp. Range | 200-300°C |
Joining Methods
| Soldering | Excellent |
| Brazing | Excellent |
| Oxy-acetylene welding | Good |
| Gas-shielded arc welding | Good |
| Resistance welding: Spot and Seam | Not Recommended |
| Butt | Good |
Typical Applications
CW501L / CZ101 is most commonly utilized for architectural applications including decorative metalwork, showcase and window fittings, roofing panels, grillwork, weather-strip, cold-formed angles and channels, ornamental pressing and trim. It is also used for decorative items and jewelry including cosmetic compacts, cases, costume jewelry, emblems, medallions and other items requiring vitreous enamelling or for hardware such as, rivets, screws, wire gauzes and slide / zip fasteners.
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