Brass is made of copper and zinc. Standard brasses contain roughly 58% to 95% copper, and zinc makes up most of the rest, according to the Copper Development Association.
Brass is an alloy, not a pure metal. Makers sometimes add small amounts of lead, tin, or iron to change how it behaves.
This guide covers the ratios, the common grades, and the extra ingredients. It also explains how brass differs from bronze.
Brass Composition at a Glance
- Main metal: copper (Cu).
- Main alloying metal: zinc (Zn).
- Copper range: about 58% to 95% in standard compositions.
- Optional extras: lead, tin, iron, and others in small amounts.
- Colour: zinc turns copper's red into yellow and gold shades.
Why Copper and Zinc Work So Well Together
Copper alone is soft and red. Add zinc, and the metal gets stronger and turns golden. The CDA describes zinc as toning copper's red into a range of yellow hues.
Zinc content also decides the internal structure of the metal. That structure controls how easily the brass bends, stretches, or cuts.
The Three Structure Zones
| Zinc content | Structure | What it means |
|---|---|---|
| Up to about 35% | Alpha | Zinc dissolves fully into copper. The metal forms easily when cold. |
| About 35% to 45% | Alpha-beta | A mixed structure. It is harder and stronger, but less ductile. |
| Above about 45% | Beyond standard brass | Outside the usual brass range. Check the specific alloy standard. |
Sources: Copper Development Association and CDA Publication 117.
Common Types of Brass and Their Ratios
Brass names often come from the copper-to-zinc ratio. "70/30" simply means 70% copper and 30% zinc.
| Type | Typical composition | Known for |
|---|---|---|
| Gilding metal | 95/5 up to 80/20 Cu/Zn | Gold-like colour |
| Cartridge brass (C26000) | 70% Cu, 30% Zn | Very high cold formability and deep drawing |
| Yellow brass | 63% to 66% Cu, 34% to 37% Zn | Lower cost, slightly less ductile |
| Admiralty brass | 71% Cu, 28% Zn, 1% Sn | Alpha brass with tin added |
| 60/40 brass | 60% Cu, 40% Zn | Strength; used in tube sheets |
Sources: Copper Development Association and CDA Publication 117.
Copper vs Zinc: A Quick Visual
Orange = copper, grey = zinc, dark = other elements (tin or lead). *Nominal values; the standard allows a range.
What Else Goes Into Brass?
Copper and zinc do the heavy lifting. Small extras fine-tune the result.
- Lead: improves machining and bearing properties, but it is toxic.
- Tin: appears in Admiralty brass, at about 1%.
- Iron: present in small amounts, up to 0.35% in C36000.
- Manganese and silicon: appear in some strong alpha-beta grades.
Free-Cutting Brass: The Lead Example
C36000 is the best-known leaded grade. MatWeb lists 60% to 63% copper, 2.5% to 3.7% lead, and up to 0.35% iron. Zinc makes up the remainder.
The lead improves machinability, as noted by MakeItFrom. The trade-off is toxicity, so lead-free grades exist for products that touch drinking water.
Brass vs Bronze: Quick Comparison
| Feature | Brass | Bronze |
|---|---|---|
| Main alloying metal | Zinc | Tin (traditionally) |
| Base metal | Copper | Copper |
| Typical look | Yellow to gold | Reddish-brown |
Wikipedia's list of copper alloys calls bronze and brass the best-known traditional types. It also notes that both terms are imprecise. Expect some overlap in real-world naming.
A Short History of How Brass Was Made
- Brass dates back to the early Romans, per Wikipedia.
- Early makers used cementation, which heats zinc ore and copper in a closed crucible with charcoal.
- Modern producers melt copper and zinc directly and control the ratio precisely.
Yes, ancient metalworkers made an alloy of two metals using charcoal and patience. Your kettle has less drama.
Which Brass Should You Choose?
- Deep drawing or stamping: pick 70/30 cartridge brass.
- Machined parts: pick free-cutting C36000, unless lead is restricted.
- Decorative work: pick a gilding metal for its gold colour.
- Drinking water contact: pick a certified lead-free grade.
Frequently Asked Questions
What is brass made of?
Brass is an alloy of copper and zinc. Some grades add small amounts of lead, tin, or iron.
Is brass a pure metal?
No. Brass is an alloy, meaning a blend of metals.
How much copper is in brass?
Standard compositions range from about 58% to 95% copper, according to the CDA. Some sources quote slightly different ranges, so check the specific grade.
Does brass contain lead?
Some grades do. C36000 contains about 2.5% to 3.7% lead. Many other grades, such as 70/30 cartridge brass, contain none.
Why is brass yellow?
Zinc softens copper's red colour into yellow and gold shades.
Is brass the same as bronze?
No. Brass relies on zinc, while bronze traditionally relies on tin.
Keep Exploring
- Love music? Read the Beginner's Guide to Portable Electric Drums.
- Browse more reads in the GMRU Entertainment section.
Sources
Brass is made of copper and zinc. Standard brasses contain roughly 58% to 95% copper, and zinc makes up most of the rest, according to the Copper Development Association.
Brass is an alloy, not a pure metal. Makers sometimes add small amounts of lead, tin, or iron to change how it behaves.
This guide covers the ratios, the common grades, and the extra ingredients. It also explains how brass differs from bronze.
Brass Composition at a Glance
- Main metal: copper (Cu).
- Main alloying metal: zinc (Zn).
- Copper range: about 58% to 95% in standard compositions.
- Optional extras: lead, tin, iron, and others in small amounts.
- Colour: zinc turns copper's red into yellow and gold shades.
Why Copper and Zinc Work So Well Together
Copper alone is soft and red. Add zinc, and the metal gets stronger and turns golden. The CDA describes zinc as toning copper's red into a range of yellow hues.
Zinc content also decides the internal structure of the metal. That structure controls how easily the brass bends, stretches, or cuts.
The Three Structure Zones
| Zinc content | Structure | What it means |
|---|---|---|
| Up to about 35% | Alpha | Zinc dissolves fully into copper. The metal forms easily when cold. |
| About 35% to 45% | Alpha-beta | A mixed structure. It is harder and stronger, but less ductile. |
| Above about 45% | Beyond standard brass | Outside the usual brass range. Check the specific alloy standard. |
Sources: Copper Development Association and CDA Publication 117.
Common Types of Brass and Their Ratios
Brass names often come from the copper-to-zinc ratio. "70/30" simply means 70% copper and 30% zinc.
| Type | Typical composition | Known for |
|---|---|---|
| Gilding metal | 95/5 up to 80/20 Cu/Zn | Gold-like colour |
| Cartridge brass (C26000) | 70% Cu, 30% Zn | Very high cold formability and deep drawing |
| Yellow brass | 63% to 66% Cu, 34% to 37% Zn | Lower cost, slightly less ductile |
| Admiralty brass | 71% Cu, 28% Zn, 1% Sn | Alpha brass with tin added |
| 60/40 brass | 60% Cu, 40% Zn | Strength; used in tube sheets |
Sources: Copper Development Association and CDA Publication 117.
Copper vs Zinc: A Quick Visual
Orange = copper, grey = zinc, dark = other elements (tin or lead). *Nominal values; the standard allows a range.
What Else Goes Into Brass?
Copper and zinc do the heavy lifting. Small extras fine-tune the result.
- Lead: improves machining and bearing properties, but it is toxic.
- Tin: appears in Admiralty brass, at about 1%.
- Iron: present in small amounts, up to 0.35% in C36000.
- Manganese and silicon: appear in some strong alpha-beta grades.
Free-Cutting Brass: The Lead Example
C36000 is the best-known leaded grade. MatWeb lists 60% to 63% copper, 2.5% to 3.7% lead, and up to 0.35% iron. Zinc makes up the remainder.
The lead improves machinability, as noted by MakeItFrom. The trade-off is toxicity, so lead-free grades exist for products that touch drinking water.
Brass vs Bronze: Quick Comparison
| Feature | Brass | Bronze |
|---|---|---|
| Main alloying metal | Zinc | Tin (traditionally) |
| Base metal | Copper | Copper |
| Typical look | Yellow to gold | Reddish-brown |
Wikipedia's list of copper alloys calls bronze and brass the best-known traditional types. It also notes that both terms are imprecise. Expect some overlap in real-world naming.
A Short History of How Brass Was Made
- Brass dates back to the early Romans, per Wikipedia.
- Early makers used cementation, which heats zinc ore and copper in a closed crucible with charcoal.
- Modern producers melt copper and zinc directly and control the ratio precisely.
Yes, ancient metalworkers made an alloy of two metals using charcoal and patience. Your kettle has less drama.
Which Brass Should You Choose?
- Deep drawing or stamping: pick 70/30 cartridge brass.
- Machined parts: pick free-cutting C36000, unless lead is restricted.
- Decorative work: pick a gilding metal for its gold colour.
- Drinking water contact: pick a certified lead-free grade.
Frequently Asked Questions
What is brass made of?
Brass is an alloy of copper and zinc. Some grades add small amounts of lead, tin, or iron.
Is brass a pure metal?
No. Brass is an alloy, meaning a blend of metals.
How much copper is in brass?
Standard compositions range from about 58% to 95% copper, according to the CDA. Some sources quote slightly different ranges, so check the specific grade.
Does brass contain lead?
Some grades do. C36000 contains about 2.5% to 3.7% lead. Many other grades, such as 70/30 cartridge brass, contain none.
Why is brass yellow?
Zinc softens copper's red colour into yellow and gold shades.
Is brass the same as bronze?
No. Brass relies on zinc, while bronze traditionally relies on tin.
Keep Exploring
- Love music? Read the Beginner's Guide to Portable Electric Drums.
- Browse more reads in the GMRU Entertainment section.