Special Fused Silica Micro Powder for Vacuum Casting

• 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

Product Overview

This product is a high-purity fused silica micro powder specially designed for vacuum casting processes. It features ultra-high purity (≥99%), low thermal expansion coefficient, excellent flowability, and chemical stability. Ideal for precision casting, epoxy resin encapsulation, composite material reinforcement, and other applications, it significantly enhances dimensional accuracy, mechanical strength, and temperature resistance of finished products.

Core Advantages

 Ultra-High Purity: SiO₂ content ≥99%, heavy metal impurities <50ppm, meeting high-end electronic-grade requirements
 Precise Particle Size Control: Customizable D50 range of 0.5μm-50μm (standard stock specifications: 5μm/10μm/20μm)
 High Sphericity: True spherical rate >90%, reducing resin system viscosity and increasing filling rate (up to 75%)
 Low Alpha Radiation: <0.02 cph/cm², suitable for sensitive semiconductor packaging scenarios
 Optional Surface Modification: Silane coupling agent (KH-550/KH-560) treated versions available to enhance interfacial bonding

Technical Parameters

Parameter	Specification
Chemical Purity	SiO2≥99%, Al2O3≤0.3%, Fe2O3≤0.01%
Particle Size Distribution	D50: 0.5-50μm
Specific Surface Area	2-15 m²/g (adjusted by particle size)
Density	2.2 g/cm³ (true density)
Mohs Hardness	7
Dielectric Constant	3.8-4.2 (1MHz)
Thermal Expansion Coefficient	0.5×10^-6/ºC (RT-300ºC)
Moisture Content	≤0.1% (dried at 105ºC)

Typical Applications

 Vacuum Casting: Reduces bubble formation and improves dimensional accuracy (±0.05mm)
 Electronic Encapsulation: Filler for epoxy molding compounds (EMC), enhancing thermal/electrical insulation properties
 Precision Casting: Surface coating for lost foam/investment casting, improving surface finish
 Composite Materials: Reinforces engineering plastics (PEEK/PTFE) for wear resistance & dimensional stability
 Ceramic Sintering: Acts as a flux agent to lower sintering temperatures

Packaging & Storage

 Standard Packaging: 25kg/bag (customizable)
 Transportation: Handled as non-hazardous goods; avoid moisture and severe vibration
 Shelf Life: 24 months in dry conditions

Support Services

▸ Free samples available (starting from 100g)
▸ Technical support: Process parameter optimization recommendations
▸ Custom services: Particle size grading, surface modification, and blending solution design

Contact us now for the latest technical data and quotation!

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