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Alloys and calculations of weight
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Specific
Gravity
Factor
General Purpose Casting Alloys
21.60
19.36
18.00
16.25
16.00
14.00
12.25
13.50
11.75
11.85
11.00
10.75
10.75
9.40
8.60
trans1x1.gif (42 bytes) Platinum
Fine Gold
18ct Palladium White Gold
18ct Yellow Gold
18ct Pink Gold
14ct Yellow Gold
10ct Yellow Gold
9ct White Gold
9ct Yellow Gold
9ct Pink Gold
Fine Silver
Sterling Silver
Bright Silver 925
Bronze
Brass

Calculation of metal weights

The factors shown in the left hand column above will enable you to estimate given metal weight from either wax or another metal type.

Examples

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a)

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A wax pattern of .32 gm for which an estimated weight in 18ct Yellow Gold is required:

.32 gms x 16.25 = 5.20 gms

b)

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An item weighing 4 gms in Stg.Sil. for which an estimated weight in 9ct Yellow Gold is required:

4 gms x (11.75/10.75) = 4.37 gms

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NOTE:trans1x1.gif (42 bytes)We find it is easier in use to convert back to wax and from there to the required metal type.

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Working Example:
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bulletCatalogue Pattern C1083 weighs 2.79 gms in Stg. Sil.
bulletDivide by 10.75 to obtain a wax weight.
bulletMultiply the wax weight by the figure from the above list which corresponds with your chosen metal.

trans1x1.gif (42 bytes)e.g. wax weight .26 gms x 11.75 (9 Yg) = 3.06 gms.

trans1x1.gif (42 bytes)Therefore design C1083 in 9 Yg will have an approximate weight of 3.06 gms.

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Last modified: July 30, 1998