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.
Fused silica powder for refractory gunning mix trials where phase identity, particle-size control and process compatibility must be evaluated together. Confirm grade-specific chemistry, PSD, moisture and application fit against the customer’s mix and spraying conditions.
Fused silica powder for EV inverter and power-module epoxy potting trials where low expansion and dimensional stability are required. Match purity and PSD to viscosity, vacuum filling, thermal cycling, dielectric strength and partial-discharge acceptance in the customer’s resin system.
M4000 calcined cristobalite powder for EV high-voltage silicone cable compound trials. A supplied batch reports D50 6.15 μm, SiO2 99.63%, Fe2O3 0.009%, moisture 0.1% and whiteness 94%; qualify dispersion, cure, electrical insulation and finished-cable performance in the customer’s formulation.
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.
A material-identity guide for electrical encapsulation that separates fused silica from cristobalite before PSD, grade and component-trial decisions.
Learn how to screen silica powder for ceramic membrane supports by linking phase, PSD, slurry behavior, forming, firing, porosity, permeability and strength.
A controlled trial plan for cristobalite in high-solids UV coatings, covering powder data, dispersion, drawdown, cure conditions and finished-film checks.
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.
Selected quartz sand grades for foundry, refractory, filtration and construction 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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