I bought the #4 and #6 crucibles. They arrived packaged very well in fitted foam inside cardboard boxes. They seem sturdy with thick walls. I am happy with the apparent quality and condition. I haven't fired them up yet but they came with instructions for seasoning them first. The widths and heights for both are about 1/8" smaller than the description, but that's close enough. As far as fitting tongs to them, the #6 has nearly straight vertical walls but narrows at the bottom, while the #4 noticeably tapers gradually a bit all the way to the bottom.
My disappointment was that they hold smaller capacity than what was described. I filled them each to the brim with sand and then measured it. The #4 described as 490 ml holds only 400 ml of sand, while the #6 described as 710 ml holds only 575 ml. That means that the actual capacity of them is 20% less than the product descriptions show. On top of that, I had planned on filling them to 80% for safety but that means they will only safely hold maybe 60% of their described capacities. It makes me wonder if all sizes are that way. Maybe crucibles of any brand are measured this way and I'm just understanding it wrong, but now I know that I'll have to buy several sizes larger than I originally planned for my melt capacities. Other than that, I'm happy with them and plan to buy another larger one.
Want more information on 1 Kg Graphite Crucible? Feel free to contact us.
High purity (99%) heat resistant graphite crucible with flat bottom. Maximum casting capacity: 44 Lb, good for use with induction heating, recommended for precious metals casting. Compatible with 25kW low-frequency induction heaters for melting manufactured by Across International.
Graphite, often called black lead, cantolerate thermal shock and withstands constant working temperature up to C or C (vacuum condition). They are the best electrical conductive material known to man, 4 times of steel, 5 times of copper and 100 times of non-metallic materials. They also have higher thermal conductivity than steel, iron and lead, plus resistant to acid, alkali and organic solvent.
Attention! ALWAYS wear protective eyewear/googles during operation.
Specifications
Graphite purity
99%
OD
6.7 inches (170 mm)
ID
For more How is Graphite Block Made?information, please contact us. We will provide professional answers.
5.5 inches (140 mm)
Height
7.9 inches (200 mm)
Depth
7.1 inches (180 mm)
Wall thickness
0.6 inch (15.5 mm)
Weight
7 Lb
Capacity
0.73 gallon (2.77 liters)
Capatible induction heater
Across International 25kW low frequency
induction heater for melting (Item#: IHL25K)
Contact us to discuss your requirements of manufacturer of graphite blocks. Our experienced sales team can help you identify the options that best suit your needs.