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Investment Powder > DIAMOND
JPL Diamond Label is the high end investment powder formulated for casting white gold-palladium and nickel jewelry. It can withstand high temperature and gives a very fine surface finish.
Product Packaging:
DRUM: 45.4 kg. (100 lb.)
SACK: 22.7 kg. (50 lb.)
Technical Data
POWDER / WATER RATIO WORKING TIME GLOSS OFF TIME THERMAL EXPANSION AT 750 SETTING EXPANSION AFTER 2 HOURS VOLUME YIELD PER KG. OF POWDER |
100/38-40 6-7 min. 10-12 min. 0.69% 0.49% 755 ml. |
DEWAX CYCLE
Diamond can be both dry and steam dewaxed with excellent results. As a general rule the larger the flask the longer the dewax time.
Dry dewax in a furnace should take place at about 175-200oC depending on the size of the flask. For a 6”x4” flask, 60-90 min will be sufficient to remove the bulk of the wax and 2 hours should be sufficient for steam dewax.
BURNOUT CYCLE
Burnout cycles will depend very much on the size of the flask. The larger the flask or the waxes therein the longer and more gradual the burnout must be. For 6”x4” flask will should be need 11-13 hours. In addition the furnace must have a good supply of air in order to achieve a clean burnout. Carbon deposits from the wax must combine with oxygen to form CO2 and thus escape through the pores of the investment. If after Burnout your mould is a gray colour you need to get more air into the furnace-do not increase the temperature, this will only damage the investment
CASTING
After completion of burnout, the flask should decrease flask temperature to proper casting temperature cool to proper casting temperature. The flask can then be cast by either centrifugal or vacuum casting methods.
Temperature of the last 1-2 hours of burnout must be adjusted at proper temperature for casting. If held for less than 1 hour, the core of the flasks will be at a much higher temperature, and may result in metal mould reaction in addition 15 minute is recommend time for quenching
CASTING CONDITIONS:
Metal Casting (oC) | Flask (oC) | |
Normal casting | 990 - 1000 | 550 - 580 |
Fine Filigree | 1010 - 1020 | 600 - 630 |
The above conditions are for guidance only and may need to be optimized for your own experience and knowledge of your casting machine.
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322/5-6 1st Floor, Bangkok Gem & jelelry Tower Surawong Road, Bangrak Bangkok 10500 Thailand
Tel: 02-2671178, Fax: 02-2671178, Email: jpl@jewelryplaster.com