SIAM CASTING POWDERS LTD.
HIGH QUALITY INVESTMENT POWDERS
AND CASTING EQUIPMENT

 

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Technical data
Siam Casting Powders Ltd
Jewellery Trouble Shooting
Casting problems
Mould Rubber problems
Wax Pattern problems
Mixing Guide
Burn Out
Casting Temperature Guide
Melting point and specific
gravity of jewellery alloys
Comparative Weights
and Measures
 
    TECHNICAL DATA Technical data
Comparative Weights and Measures  
 

TROY  WEIGHT AVOIRDUPOIS  WEIGHT
Used  in  weighing  the  precious  metals. Used  in  weighing  the  base  metals.
24 grains 1  pennyweight 27-1/3 grains 1 dram (or drahms)
20 pennyweights (dwt)         1 ounce troy 16  drams 1 ounce avoir
12 ounces 1 pound troy 16 ounces 1 pound
5760 grains 1 pound troy 16 ounces 700 grains
The troy is about 10% heavier than the
Commonly  used  avoirdupois  ounce.
Avoirdupois  ounces x 0.9115 =  troy  ounces.
the avoirdupois pound is about 21 ½%
heavier than the troy pound.
Troy ounces x 1.0971 = avoirdupois ounces.
 

GRAM  WEIGHT

1 gram = 15.432 grains troy 31.104 grams = 1 ounce troy
1.555 grams = 1 pennyweight  dwt. 28.35 grams = 1 ounce avoirdupois
 

CARAT  WEIGHT

Used in weighting precious stones and semi-precious gemstones.
1 carat  = 3.086 grains troy   1 carat  = 0.20 grams
1 carat  = 0.007 ounce avoirdupois   1 carat  = 5 carats
The carat is further divided into points for simple measurement.
1 carat  = 100 points   ¼  carat  = 25 points
½ carat  = 50 points   1/8 carat = 12.5 points
 

FLUID  MEASUREMENT

1 ounce (fluid) =  29.57 cubic centimetres - 1.8 cubic inches.
1 dram  =  ½ ounces (fluid) = 1.85 cubic centimetres.
1 quart  =  32  ounces (fluid)  =  2  pints =  ¼  gallon  =  57 cubic inches.
1 gallon  =  4  quarts  =  128 ounces (fluid)   =  3.78  litres.
1 litre  =  1000cc (slightly more than 1 quart U.S. )  =  0.264  U.S. gallons.
1 imperial  gallon = 1.2 U.S. gallons  =  4.59 liters  =  277.27 cubic inches.

 
TEMPERATURE
To  convert :

Fahrenheit  to  Centigrade (Celsius)  =  Subtract  32  from  degrees  Fahrenheit, multiply  remainder  by 
5, divide  the  product  by 9.

Centigrade  to  Fahrenheit  =  Multiply  degrees  Centigrade  by 9, divide  product  by 5, and  add 32.
The  photographs, descriptions  and  information  provided  in  this  catalogue  are  given  in  good  faith.
We  reserve  the  right  to  make  changes  in  design  and  specifications  without  notice.