Established in 2009 in Lianyungang, China, Changtong manufactures fused silica, crystalline silica powder, cristobalite, ultrafine silica and surface-treated silica for industrial applications.
Controlled purification, grinding, classification and particle-size management support consistent industrial silica grades. COA documentation is available for every batch under our ISO 9001 quality system.
Choose custom particle sizes and silica grades for investment casting, electronics, coatings, ceramics, refractories and other demanding industrial applications.
Fast delivery to destinations worldwide
COA provided with every batch
About Changtong
Lianyungang Changtong Silica Powder Co., Ltd. is a silica material manufacturer based in Lianyungang, Jiangsu, China. Established in 2009, we supply crystalline silica, fused silica, cristobalite, ultrafine and surface-treated silica.
Our capabilities include purification, grinding, classification, particle-size control and surface modification. We support electronics, investment casting, refractories, ceramics, coatings, plastics, rubber and adhesive applications.
ABOUT CHANGTONG
Explore our silica material capabilities, quality-control process and application support for industrial buyers.
Crystalline silica, fused silica and cristobalite grades matched to industrial applications.
Purification, grinding, classification and particle-size control support consistent supply.
Technical guidance for electronics, casting, refractories, ceramics, coatings and compounds.
Featured Silica Products
Compare representative fused silica and calcined silica grades for precision casting, technical ceramics, refractory products and specialized mold production.
Amorphous fused silica powder for investment casting with low thermal expansion, high SiO2 purity, and dust-removed, size-controlled particles for reliable shell building.
Clean, high-purity fused silica sand selected for technical ceramics, fused silica rollers, crucibles and advanced refractory products.
White cristobalite flour at G325 mesh with SiO2 above 99.6% for precision casting, exterior and traffic paints, silicone rubber, and specialty ceramics.
Traceable Quality
Each grade is controlled for chemical composition and particle size distribution. Batch-specific Certificates of Analysis, third-party SGS and RoHS reports, ISO 9001 quality management and safety data sheets support purchasing, inspection and export documentation.
Chemical composition and particle size distribution are controlled per grade, and each batch ships with its own Certificate of Analysis.
Third-party evidence includes SGS chemical analysis and a RoHS ten-item screening report that support export and buyer audits.
An ISO 9001 certified quality system plus material safety data sheets support customs and compliance documentation for every export.
Silica Knowledge Center
Explore practical guides on fused silica, cristobalite, quartz powder, particle-size selection, processing methods and application requirements from the Changtong technical team.
Move a quartz filler comparison from beaker to pilot mixer with a decision matrix that separates material effects from scale-up effects.
Read flexural strength, impact, absorption, density, Mohs hardness and deep abrasion as separate results when qualifying a glass-filled slab trial.
Compare filler trials for low-crystalline-silica slab development by total cost per accepted area, while keeping phase evidence and slab qualification as separate gates.
PRODUCT FAMILIES
Browse crystalline silica, fused silica, cristobalite, high-purity quartz, quartz sand and quartz products by material family and application.
Crystalline silica powders for coatings, epoxy, ceramics and general industrial filling.
Low-expansion fused silica powder, sand and granules for electronics, casting and refractories.
Calcined cristobalite grades for ceramics, casting, coatings and engineered compounds.
Purity-focused quartz materials for electronics, glass and demanding industrial processing.
Washed and graded natural quartz sand for engineered stone, resin-bound flooring, terrazzo, ceramics and foundry applications.
Quartz plates, rods and custom shapes for laboratory and industrial use.
Buyer questions
Quick answers on sample availability, custom particle sizes and the quality documents supplied for industrial silica orders.
Still need help? Send your target specification through the inquiry form and the technical team will guide the trial.
Contact
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Inquiry intake
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