Low Thermal Expansion Fused Silica Micro Powder

• Customization: Available
• Certification: ISO
• Application: Rubber, Plastic, Chemical, Construction, Metallurgy, Ceramic, Casting, Glass
• Model NO.: SF
• Transport Package: Paper Bag, Big Bag, Pallet
• Specification: SiO2>99%
• Trademark: ST
• Origin: Lianyungang, China
• HS Code: 32074000
• Production Capacity: 50000pieces/Year

Product Description

Key Parameters

Parameter	Technical Specification
Purity	≥99% (Measured: 99.2%-99.8%)
Particle Size (D50)	0.5μm-50μm (Custom grading available)
Thermal Expansion Coefficient	0.5×10^-6/ºC (25-300ºC)
Dielectric Constant	3.8-4.1 (at 1MHz)
Mohs Hardness	7
Appearance	White ultrafine powder, free of visible impurities
Moisture Content	≤0.1%

Product Features

 Ultra-Low Thermal Expansion - CTE is only 1/5 of conventional silica powder, significantly improving dimensional stability of composites.
 High Purity & Contaminant-Free - 99%+ purity, with Fe, K, Na, and other metal ions <100ppm.
 Precise Particle Size Control - Strictly graded by laser particle analyzer, customizable in 0.5-50μm range.
 Excellent Dielectric Properties - Low dielectric loss (<0.001) in high-frequency applications, ideal for 5G communication fillers.
 High-Temperature & Oxidation Resistance - Softening point >1600ºC, suitable for high-temperature sintering processes.

Typical Applications

▸ High-end electronic packaging materials (IC substrates/EMC encapsulants)
▸ 5G high-frequency PCB fillers
▸ Aerospace heat-resistant coatings
▸ Precision optical glass additives
▸ Special ceramic sintering aids

Production Process

High-purity quartz sand arc melting → Ultrasonic jet milling → Multi-stage precision classification → Magnetic iron removal → Vacuum packaging.
Fully enclosed production compliant with ISO9001-2015 quality management system.

Packaging & Storage

Standard packaging: 25kg/bag
Custom packaging: Available upon request
Storage conditions: Keep in a cool, dry place to avoid moisture clumping.

Why Choose Us?

Years of expertise in fused silica micro powder production
Support for non-standard particle size customization (D10/D50/D90 specifications required)
Free sample testing and technical consultation services

Company Information:

Jiangsu Shengtian New Materials Co., Ltd. has a technical research and development team focusing on ultra-fine powder materials, and has strong strength in the research and development and production of ultra-fine functional materials, composite materials and related applications, and has become a more influential high-tech enterprise in the ultra-fine functional powder industry.
The company's products include crystalline silicon powder, molten silicon powder, soft composite silicon powder, spherical silicon powder, aluminum oxide powder, ceramic powder, glass powder and other ten categories, nearly 100 kinds of different specifications of products, and has a strong modification, compounding and other follow-up deep processing technology and capabilities. The products are processed by special technology, the production technology is leading and innovative, and the introduction of international technical standards for similar products, widely used in electronic packaging, copper clad plate, ink coating, adhesive, ceramics, precision casting, glass fiber, plastic rubber and other industries, giving its functionality while helping customers reduce costs. And provide the overall application of technology solutions.
The company has more than 20 different types of production lines, more than 100 sets of domestic advanced equipment, with an annual output of 50,000 tons. The company adopts professional production and testing equipment and formulates strict production quality control system to conduct all-round control of product quality. All products of the company have passed SGS environmental protection testing, in line with the EU ROHS green environmental protection standards. The company took the lead in the silicon powder industry through the ISO9001 quality management system certification and ISO14001 environmental management system certification, has passed the high-tech product identification. The company's products and solutions have been applied to more than 160 enterprises around the world, including more than 80 customers with stable cooperation for more than 10 years.

Workshop:
 

An excellent manufacturing enterprise

The company has 20 patents, the company has passed ISO9001 and ISO14001 certification, and has been recognized as a national high-tech enterprise