OBT has been manufacturing and supplying foundy and refractory materials for more than 20 years. Our stable quality and good after-sales service help us to obtain high feedback from European, South America, Japan,Thailand, Korea,Taiwan, Vietnam, Cambodia, Philippine, Malaysia, etc.Our product range:Mullite sandColloidal SilicaPattern WaxChemical additiveApplication:Precision Investment CastingLost Wax CastingRefractory Bricks ManufacturingCoatings industryTextile industryPaper industryPetroleum industryCeramic industryElectronic polishing industry Our advantage:--No.1 largest mullite sand and foundry materials manufacturing and supplying plant in China--200000tons-500000tons production capacity--8 own calcining kilns , maximum 10% cost reduction benefit to customers--5 days of the minimum delivery period--No dust,Low abrasion, higher hardness, uniform particle size distribution makes it the most suitable to the manufacturing process.After 20 years of development, we have become a world renowned company which meet the needs and solves the problems of customers with foundry materials. We will focus on listening to the changing needs of customers and using the power of our core values to be better. We welcome new and old customers from all walks of life to contact us for future business and mutual benefits
casting part
Certificates
Foundry Material
Colloidal silica
Fused Silica Products

Precision casting use high purity fused silica sand foundry 100-200 mesh SiO2 99.7%
Model : OBT-100-200

99.9 - 99.99% SiO2 0 - 1mm Fused Silica Sand Acidic Acid Refractory Materials
Model : OBT-0-1

1-3mm Optical glass use high purity fused silica sand SiO2 99.9% quartz sand
Model : OBT-1-3

25 um 99.9% high Purity White Quartz Crystal Powder for precision casting Refractory material
Model : OBT-15um

20 um High Whiteness Fused Silica Powder Melted Quartz Sand for Investment Casting
Model : OBT-20um

3-5mm White High Purity Silica Sand Fused Quartz For Epoxy Resin Ceramics Refractory
Model : OBT-3-5

Precision casting use Refractory high purity fused silica sand 50-100 mesh SiO2 99.7%
Model : OBT-50-100

















