This page is a general guide to the care and usage of Crucibles, such that users are quided for maximum efficiency and optimum results.
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Observer Dry storage, pre heat before initial usage |
Do not roll or subject to rough treatment |
Do not store one crucible in another, stack inverted if place is short |
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use the correct formulated crucible for optimum results |
Delayed temp. rise at low temp. will cause harm to the ingredients of the crucible. increase temp. rapidly after dull red red heat is attained |
adjust flame setting correctly to avoid oil spray into the crucible |
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Adjust flame alignment to avoid flame to be directly onto the crucible |
Use correct sized base preferably 10 / 15 mm larger in Dia to the base Dia. of the crucible |
Place crucible correctly in the furnace to ensure overall heating and not overheating |
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Do not add smelting ingredients before metal has liquified as these will cause harm to the crucible body |
Use smelting ingredients to the desired quantity to avoid overstraining the crucible |
Use poking bars with a bend to avoid poking into the metal and to the crucible |
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Carefully load the crucible with metal preferably placing fines / small pieces at the base before large one are fed in the crucible |
Do not jam ingots horizontally, metal expansion allowance is to be kept in mind and fed vertically |
Keep an allowance for crucible expansion by placing a wooden / asbestos wedge between the crucible and rim |
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Do not let metal to solidify in the crucible, insted pour out all the metal left over in to small ingots to be used next day |
Use correctly fitting tongs to avoid pressure on to the crucible during lift off |
Lift off crudibles placing tongs at adequate depth |
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Unsuitable melting ingredients will orrode the crucible at metal level, use these at appropriate time and in required quantities |
Avoid extreme draught supply and maintain correct blower pressure to permit evenly distributed heating |
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