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 glass powder filler for zero-crystalline-silica building-panel development. Specify sieve residue, color and moisture for your resin formulation; confirm phase content in the final slab.
Amorphous glass sand aggregate for low-crystalline-silica slab development. Compare fine and mid-size cuts for grain pattern, grading and resin wet-out; agree application-specific acceptance limits.
Amorphous fused silica powder for reformulating engineered stone toward low or zero crystalline silica. Historical qualitative XRD supports phase identification; qualify current lots and slabs.
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.
Trace bubbles in quartz-filled polyurethane by separating water-related gas from mixing air. Check sampling, treatment compatibility and controlled casting trials.
Evaluate cristobalite-filled silicone seals with controlled compression, cure history and recovery measurements. Hardness alone cannot qualify seal behavior.
Check silica-filled epoxy cure by separating filler dilution from reaction changes, then connect DSC evidence to the temperature history of the cast part.
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.
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Contact
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