From Atoms to Materials

Coinage metals Properties Harder, more malleable, more corrosion-resistant than copper Uses Making coins Bronze Properties Stronger, more corrosion- resistant than copper Uses Making statues and ornaments The compositions given below are typical values only. Actual compositions may slightly vary to suit specific purposes. Duralumin* Properties Stronger, harder, and more corrosion-resistant than aluminium, low density Uses Building aircraft bodies Copper alloys Aluminium alloy Alloys and their uses copper 90% tin 10% copper 75% nickel 25% aluminium 95% copper 3% magnesium 1% manganese 1% Carat gold Properties Harder than pure gold Uses Making jewellery and coins Gold alloy copper 95% zinc and tin 5% brass 黃銅 duralumin 硬鋁 gold (majority) (variable proportions) silver copper More to Read Some coins in Hong Kong may also contain iron. Properties Shinier, stronger, more corrosion- resistant than copper Uses Making musical instruments and ornaments copper 70% zinc 30% Brass* 76 © United Prime Educational Publishing (HK) Limited 2024 All rights reserved; no part of this publication may be reproduced, photocopied, recorded or otherwise, without the prior written permission of the Publisher. Sample