<Tr> <Td> Beta brasses </Td> <Td> 50--55 </Td> <Td> 45--50 </Td> <Td> Beta brasses can only be worked hot, and are harder, stronger, and suitable for casting . The high zinc - low copper content means these are some of the brightest and least - golden of the common brasses . </Td> </Tr> <Tr> <Td> Gamma brasses </Td> <Td> 33--39 </Td> <Td> 61--67 </Td> <Td> There are also Ag - Zn and Au - Zn gamma brasses, Ag 30--50%, Au 41% . </Td> </Tr> <Tr> <Td> White brass </Td> <Td> <50 </Td> <Td>> 50 </Td> <Td> These are too brittle for general use . The term may also refer to certain types of nickel silver alloys as well as Cu - Zn - Sn alloys with high proportions (typically 40% +) of tin and / or zinc, as well as predominantly zinc casting alloys with copper additives . These have virtually no yellow coloring at all, and instead have a much more silvery appearance . </Td> </Tr> <Table> Brass alloys <Tr> <Th> Alloy name </Th> <Th_colspan="4"> Proportion by weight (%) </Th> <Th> Other </Th> <Th> Notes </Th> </Tr> <Tr> <Th> Copper </Th> <Th> Zinc </Th> <Th> Tin </Th> <Th> Lead </Th> </Tr> <Tr> <Td> Abyssinian gold </Td> <Td> 90 </Td> <Td> 10 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Admiralty brass </Td> <Td> 69 </Td> <Td> 30 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Tin inhibits loss of zinc in many environments . </Td> </Tr> <Tr> <Td> Aich's alloy </Td> <Td> 60.66 </Td> <Td> 36.58 </Td> <Td> 1.02 </Td> <Td> </Td> <Td> 1.74% iron </Td> <Td> Designed for use in marine service owing to its corrosion resistance, hardness and toughness . A characteristic application is to the protection of ships' bottoms, but more modern methods of cathodic protection have rendered its use less common . Its appearance resembles that of gold . </Td> </Tr> <Tr> <Td> Aluminum brass </Td> <Td> 77.5 </Td> <Td> 20.5 </Td> <Td> </Td> <Td> </Td> <Td> 2% aluminum </Td> <Td> Aluminum improves corrosion resistance . It is used for heat exchanger and condenser tubes . </Td> </Tr> <Tr> <Td> Arsenical brass </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Arsenic; frequently aluminum </Td> <Td> Used for boiler fireboxes . </Td> </Tr> <Tr> <Td> Cartridge brass (C260) </Td> <Td> 70 </Td> <Td> 30 </Td> <Td>--</Td> <Td> ≤ 0.07 </Td> <Td> </Td> <Td> Good cold working properties . Used for ammunition cases, plumbing, and hardware . </Td> </Tr> <Tr> <Td> Common brass </Td> <Td> 63 </Td> <Td> 37 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Also called rivet brass . Cheap and standard for cold working . </Td> </Tr> <Tr> <Td> DZR brass </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Arsenic </Td> <Td> Dezincification resistant brass with a small percentage of arsenic . </Td> </Tr> <Tr> <Td> Delta metal </Td> <Td> 55 </Td> <Td> 41--43 </Td> <Td> </Td> <Td> </Td> <Td> 1--3% iron with the balance consisting of various other metals . </Td> <Td> The proportions used make the material harder and suitable for valves and bearings . </Td> </Tr> <Tr> <Td> Free machining brass (C360) </Td> <Td> 61.5 </Td> <Td> 35.5 </Td> <Td> </Td> <Td> </Td> <Td> 0.35% iron </Td> <Td> Also called 360 or C360 brass . High machinability . Lead content, 2.5--3.7% </Td> </Tr> <Tr> <Td> Gilding metal </Td> <Td> 95 </Td> <Td> 5 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Softest type of brass commonly available . Gilding metal is typically used for ammunition bullet "jackets"; e.g., full metal jacket bullets . Almost red in color . </Td> </Tr> <Tr> <Td> High brass </Td> <Td> 65 </Td> <Td> 35 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Has a high tensile strength and is used for springs, screws, and rivets . </Td> </Tr> <Tr> <Td> Leaded brass </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td>> 0 </Td> <Td> </Td> <Td> An alpha - beta brass with an addition of lead for improved machinability . </Td> </Tr> <Tr> <Td> Lead - free brass </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> <0.25 </Td> <Td> </Td> <Td> Defined by California Assembly Bill AB 1953 contains "not more than 0.25 percent lead content". Prior upper limit was 4% . </Td> </Tr> <Tr> <Td> Low brass </Td> <Td> 80 </Td> <Td> 20 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Light golden color, very ductile; used for flexible metal hoses and metal bellows . </Td> </Tr> <Tr> <Td> Manganese brass </Td> <Td> 70 </Td> <Td> 29 </Td> <Td> </Td> <Td> </Td> <Td> 1.3% manganese </Td> <Td> Most notably used in making golden dollar coins in the United States . </Td> </Tr> <Tr> <Td> Muntz metal </Td> <Td> 60 </Td> <Td> 40 </Td> <Td> </Td> <Td> </Td> <Td> Traces of iron </Td> <Td> Used as a lining on boats . </Td> </Tr> <Tr> <Td> Naval brass </Td> <Td> 59 </Td> <Td> 40 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Similar to admiralty brass . Also known as Tobin bronze . </Td> </Tr> <Tr> <Td> Nickel brass </Td> <Td> 70 </Td> <Td> 24.5 </Td> <Td> </Td> <Td> </Td> <Td> 5.5% nickel </Td> <Td> Used to make pound coins in the pound sterling currency . Also the main constituent of the bi-metallic One Euro coin and the centre part of the Two Euro coin . </Td> </Tr> <Tr> <Td> Nordic gold </Td> <Td> 89 </Td> <Td> 5 </Td> <Td> </Td> <Td> </Td> <Td> 5% aluminium </Td> <Td> Used in 10, 20, and 50 cents euro coins . </Td> </Tr> <Tr> <Td> Prince's metal </Td> <Td> 75 </Td> <Td> 25 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> A type of alpha brass . Due to its yellow color, it is used as an imitation of gold . Also called Prince Rupert's metal, the alloy was named after Prince Rupert of the Rhine . </Td> </Tr> <Tr> <Td> Red brass, Rose brass (C230) </Td> <Td> 85 </Td> <Td> 5 </Td> <Td> 5 </Td> <Td> 5 </Td> <Td> </Td> <Td> Both an American term for the copper - zinc - tin alloy known as gunmetal, and an alloy which is considered both a brass and a bronze . Red brass is also an alternative name for copper alloy C23000, which is composed of 14--16% zinc, a minimum 0.05% iron and minimum 0.07% lead content, and the remainder copper . It may also refer to ounce metal, another copper - zinc - tin alloy . </Td> </Tr> <Tr> <Td> Rich low brass, Tombac </Td> <Td> </Td> <Td> 5--20 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> Often used in jewelry applications . </Td> </Tr> <Tr> <Td> Silicon tombac </Td> <Td> 80 </Td> <Td> 16 </Td> <Td> </Td> <Td> </Td> <Td> 4% silicon </Td> <Td> Used as an alternative for investment cast steel parts . </Td> </Tr> <Tr> <Td> Tonval brass </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td>> 0 </Td> <Td> </Td> <Td> Also called CW617N or CZ122 or OT58 . It is not recommended for sea water use, being susceptible to dezincification . </Td> </Tr> <Tr> <Td> Yellow brass </Td> <Td> 67 </Td> <Td> 33 </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> An American term for 33% zinc brass . </Td> </Tr> </Table>

What is the percentage of zinc and copper in brass