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.
Featured Silica Products
Compare representative fused silica and calcined silica grades for precision casting, technical ceramics, refractory products and specialized mold production.
Cristobalite flour for jewelry investment casting, with white appearance, controlled M3000–M6000 options and particle-size data for wax-tree and flask evaluation. Confirm grade, packing and process requirements before ordering.
Cristobalite powder for dental investment materials, produced from selected white quartz by calcination, grinding, filtration, drying and sieving. Review M3000–M6000 grades, whiteness 90–98 and the approved particle-size data for dental casting trials.
Crystalline silica filler for electronic packaging and epoxy encapsulation, with a 2000–5000 mesh reference, whiteness ≥92, Mohs 7, good mobility and anti-overflow focus. Confirm the resin system and acceptance limits before sampling.
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.
Learn how cristobalite flour is produced through phase conversion, grinding, classification, and particle-size control.
Compare fused silica, cristobalite, and crystalline quartz by structure, properties, process fit, and purchasing questions.
Learn how to evaluate fused silica for investment casting using chemistry, particle size, slurry behavior, and firing requirements.
Product Families
Crystalline silica, fused silica, cristobalite and silica sand in controlled sizes for casting, electronics, coatings, ceramics, refractories and glass.
200–6000 mesh • epoxy, coatings and ceramics.
18–6000 mesh • electronics and precision casting.
40–6000 mesh / 6–200 mesh • refractories, stone and glass.
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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