Alloys and calculations of weight

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		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

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	a)	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)	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

NOTE:

We find it is easier in use to convert back to wax and from there to the required metal type.

Working Example:

	Catalogue Pattern C1083 weighs 2.79 gms in Stg. Sil.
	Divide by 10.75 to obtain a wax weight.
	Multiply the wax weight by the figure from the above list which corresponds with your chosen metal.

e.g. wax weight .26 gms x 11.75 (9 Yg) = 3.06 gms.

Therefore design C1083 in 9 Yg will have an approximate weight of 3.06 gms.