CROWN & BRIDGE ALLOYS

TYPE ALLOY CLASSIFICATION COMPOSITION % DENSITY g/cm3 COLOR VICKERS HARDNESS ULTIMATE TENSILE STRENGTH psi PROOF STRESS psi ELONGATION % MELTING RANGE CASTING TEMPERATURE SOLDER(S) Au Pt Pd Ag Cu SOFTENED HARDENED SOFTENED HARDENED SOFTENED HARDENED SOFTENED HARDENED °F °C °F °C TYPE I SOFT 22 Karat HIGH NOBLE 91.67 - - 6 2.33 18.2 YELLOW 70 - 32,000 - 15,000 - 45 - 1850-1886 1010-1030 2066 1130 - TYPE II MEDIUM Inlay Medium HIGH NOBLE 77 - 1 13 8.5 15.8 YELLOW 134 - 52,000 - 28,000 - 47 - 1652-1733 900-945 1900 1038 650 TYPE III HARD Inlay Hard HIGH NOBLE 75 3 - 14 8 16.1 YELLOW 175 215 59,500 67,500 41,500 45,000 37 28 1670-1778 910-970 1890 1030 650 B 20 HIGH NOBLE 63 - 3 25 9 14.4 YELLOW 175 240 58,000 91,000 42,500 68,500 38 19 1634-1742 890-950 1880 1025 650, 615, 585 NYS-3 NOBLE 52.5 - 5 23 18 13.8 YELLOW 190 280 73,000 125,000 60,000 113,500 20 8 1598-1679 870-915 1830 1000 585, 450 CB-50Y NOBLE 50 - 4.5 28.5 15 13.1 YELLOW 225 275 93,000 112,000 79,000 99,500 12 6 1562-1652 850-900 1800 980 450 E-3 NOBLE 46 - 6 39.5 7.5 12.7 YELLOW 135 230 65,000 100,000 50,000 84,000 30 13 1600-1725 871-941 1900 1040 585, 450 CB-40 HIGH NOBLE 40 - 20 20 - 13.6 YELLOW 145 205 78,000 85,500 55,000 64,000 10 6 1652-1760 900-960 1900 1040 450 340 NOBLE 40 - 5 46 8 12.4 YELLOW 125 215 60,000 90,000 36,000 80,000 30 13 1575-1700 857-927 1850 1010 585, 450 320 NOBLE 20 - 20 40 - 11.8 YELLOW 125 175 60,000 84,000 50,000 63,000 8 5 1615-1700 879-927 1850 1010 450 C&B White NOBLE - - 25 70 - 10.5 WHITE 145 155 63,000 68,000 38,000 48,000 10 8 1870-2010 1021-1099 2150 1180 585, 450 TYPE IV EXTRA HARD Inlay Extra Hard HIGH NOBLE 68.5 3 3.5 12.5 12.5 15.2 YELLOW 150 255 71,000 112,000 40,000 71,500 35 7 1690-1720 921-938 1850 1010 650, 615 Unicast HIGH NOBLE 60 0.5 4 18.5 15 14.2 YELLOW 205 295 69,000 131,000 57,500 118,500 35 7 1544-1634 840-890 1742 950 585, 450 455 HIGH NOBLE 55 - 5 24 14.5 14.1 YELLOW 215 300 77,000 131,000 60,000 123,000 25 9 1634-1796 890-980 1904 1040 585, 450