Brass 80/20 (UNS: C24000)
| Bellows Materials | Brass 80/20 |
| Trade Name | Low Brass; CuZn20 |
| Description | Copper-Zinc alloy with good corrosion resistance in fresh water. Not resistant to acids. |
| Industry Uses /Products | Bellows, Flexible Hose |
| BSI Products | Bellows |
| UNS | C24000 |
| Specifications | ASTM B36 |
Material Properties
| Poisson’s Ratio | 0.34 ν |
Chemical Compostion, %
| Copper, Cu | 78.5 – 81.5 |
| Zinc, Z | 20 |
Phosphor Bronze (UNS: C51000)
| Bellows Materials | Phosphor Bronze |
| Trade Name | Phosphor Bronze “5%A” |
| Description | Copper-Lead alloy with good resistance to stress corrosion cracking. |
| UNS | C51000 |
| Specifications | ASTM B504 |
Material Properties
| Yield Strength | 36250 Sy, Psi |
| Tensile Strength | 45000 Su, Psi |
| Elongation | 45% |
| Poisson’s Ratio | 0.33 ν |
Chemical Composition, %
| Copper, Cu | 94.8 |
| Tin, Sn | 4.2 – 5.8 |
| Phosphorus, P | 0.03 – 0.35 |
Beryllium Copper (UNS: C17200)
| Bellows Materials | Beryllium Copper |
| Description | Copper-Beryllium alloy has high strength and non-magnetic properies along with good corrosion resistance. |
| Industry Uses /Products | Instrument Bellows, Precision Bellows |
| UNS | C17200 |
| Specifications | ASTM B194 |
Material Properties
| Yield Strength | 28000 Sy, Psi |
| Tensile Strength | 60000 Su, Psi |
| Elongation | 35% |
| Poisson’s Ratio | 0.33 ν |