20. CuSn8Zn4


Common name Material description
World specifications
Low lead alloy for drinking waterCuSn8Zn4--C90300
(ASTM B 505)

Other name: GREEN ALLOYS, alloys without lead, alloys with very low lead content
The equivalence between the standards is not absolute and some variations in composition can exist.

Chemical Composition in % (ASTM B 505, Castings)

Max89.09.00.305.01.00.0050.2- - - - - -

Mechanical Properties (ASTM B 505, Castings)

RmTensile strength min.303 N/mm2
Rp0.2Proof Strength min.152 N/mm2
AElongation min.18 %
HBBrinell hardness min.-


Hard, strong, tough, resistant to wear and fine-grained, good machinability and corrosion-resistant to sea water, good resistance to pounding.

It resists corrosion from seawater and stands up to impacts and wear. It also machines easily and can be cast.


Worm wheels, gears, bushings for heavy loads and low speeds,

valves, plumbing fixtures, portable water applications, gears, marine fittings and pump components.

Typical applications include aircraft landing-gear bushings, trunnion and trolley wheel bearings, and wristpin bushings.