Our standard range of fire assay clay crucibles from 30g to 65g can usually be proceeded 5-times-firing and sometimes can be even repeatedly used in more than 9 times with some formula of flux. This feature provides our customers important benefits of reducing cost per firing and increasing profitability. And we can also design and supply to our customer's individual requirements and specifications in dimensions, shape and so on.
We supply high quality fire assay multi-firing clay crucibles with the latest automated technology and so we can guarantee sizing consistency which is critical for multi-pour systems and automated lines in fire assay laboratories. Meanwhile, carefully selected raw materials and more reasonable formulation with low caustic soda, low iron content and high silicon content enable our fire assay crucibles withstand 1650 degree thermal shock.
We have more than 20 years experiences in the industrial ceramic and refractory industry, including fire assay crucible, cupel and so on. Our current factory plant of industrial ceramic and refractory products is around 30,000 square meters (around 8 acres) which includes one office building, three production workshops and one warehouse. Our current annual production capacity of crucible is 6.5 million pieces and can be expanded to more than 9 million if necessary.
Customization is also available for any requirement to shape, size and so on. We can even mold logo, model no. or other signs onto the bottom of crucible if it is required by customer.
The sample is then placed in a muffle furnace at around 1000°C. The lead oxidises with the aid of the inflowing air from the furnace muffle and then immediately melts and is absorbed into the crucible, leaving behind what is known as a precious metal prill.
The prill is then analysed for its precious metal content through dissolving it in aqua regia (a mixture of hydrochloric and nitric acid) and the concentrations determined by spectroscopic methods (AAS, ICPAES, ICPMS).
Eventual detection limits are in the region of parts per billion but accuracy is usually in the region of 3 -5% for this metallurgical analytical technique.
L.O.I(loss on ignition)
Precious Metal Analysis
Fire assay crucible
SiO2 + Al2O3
Automatic molding equipment
ISO 9001 SGS
Many stocks , delivery time around 5-10days . by sea or by air as customer request
Delivery & Service:
Timely delivery each time. Provide reliable service and responsible for each customer with each product. Our target is to satisfy every customer with the best service.
Wooden Case Dimension (mm)
7000 square meters work shop
Automatic production line
Longer working life
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