Alloy

Sterling

Coin

Property

Fine

(925 Fine)

(900 Fine)

Silver %

99.95

92.5

90.0

Copper %

-

7.5

10.0

Melting

1760°F

1475-1650°F

1435-1635°F

Range °F/°C.

960°C

801-899°C

779-891°C

Hardness,

Annealed

-

30

45

Rockwell B,

100g, 1/16" Ball

2 Numbers

-

60

65

Hard

6 Numbers

-

73

75

Hard

10 Numbers

-

77

78

Hard

Specific Gravity

10.53

10.40

10.35

Tensile

Hard

40,000-

67,000-

70,000-

Strength

45,000

72,000

75,000

lbs./sq.in.

Annealed

20,000-

35,000-

35,000-

25,000

40,000

40,000

Elastic Limit

Hard

35,000-

55,000-

60,000-

lbs./sq. in.

40,000

60,000

65,000

Annealed

15,000-

20,000-

25,000-

20,000

25,000

30,000

Elongation

Hard

6-10

4-6

5-7

in 2"

_

Annealed

40-50

30-35

30-35