Silica fume, also known as condensed silica fume or microsilica, is a spherical sub-micron amorphous silicon dioxide used in many applications. Silica fume is a co-product of silicon or ferrosilicon production, consisting of ultrafine (sub-micron), amorphous, non-porous, perfectly spherical silicon dioxide (SiO2) particles, with purity levels of 85 to 99 %. The main effect of these ultra-fine particles is to greatly improve particle packing and produce a highly pozzolanic reaction in concrete and other cementitious bond systems where the silicon dioxide reacts with calcium hydroxide, heightening performance levels and the strength and durability of these materials. Additionally, silica fume, because of its amorphous (non-crystalline) structure and its specific area, provides other useful features to various applications, including improved sintering capabilities and enhanced high temperature performance of refractory castables, resulting in reactions between microsilica and other components of the refractory mix. To summarize, silica fume has two key features which alone or in combination are the basis for its high performance: The nano-sized spherical non-porous particles create an efficient "filler effect" Primary particles have an average diameter of about 0.15 �¼m (150 nanometers) Microsilica is a highly reactive form of silica producing a "chemical effect" Thanks to its amorphous nature and high specific surface area.
Item No Index Measured Value Appearance White powder Compliance index Specific surface area of nitrogen adsorption m/g 200±10 200 Sio2- content >99.8 99.9% PH 3.7-4.5 4.19 Volatile matter % at 105 �ºC â?¤3.0 0.82 Tamping density g/dm�³ 30-60 31 Sieve residue(45�¼m) mg/kg â?¤250 19.93 Fumed silica is a very useful industrial chemical used in a variety of industrial and consumer products. Fumed silica poses a variety of health hazards to workers in various end-use industries and to those using products that use fumed silica. 1. in various resin additives, medicine, food and other fileds. 2. rubber, sealant, silica gel, adhesive, tile grout etc. 3. paint, coating, UPR, 4. CMP suspension etc; 5. Digital photo paper etc.
We are supplier of Glass Grade premium silica sand world wide.Trusted buyer can send their inquiry about purchase of Silica sand.
Silica sand: Origin: Kaimantan, Indonesia SiO2: +/- 99.5% Al2O3: +/- 0.05% Fe2O3: +/- 0.01% MC: +/- 5% Price: FOB on MV 33 USD non LC
SELL / EXPORT SAND SILICA FOB / CIF PRICE can be negotiable
Micro silica and silica sand from iran
Micro silica from iran
High purity silica refers to silicon dioxide (SiO2) with an exceptionally high level of purity, typically exceeding 99.9%. It is obtained through various refining processes to eliminate impurities and ensure its suitability for demanding applications across different industries. Characteristics and Applications Semiconductor Manufacturing: High purity silica serves as a crucial material in the production of semiconductor devices. It is used in the fabrication of silicon wafers, where its purity ensures minimal impurities that could negatively impact the electrical properties of the semiconductor. Optical Components: Silica with high purity is utilized in the manufacturing of optical fibers, lenses, and other optical components. Its transparency and low optical absorption make it ideal for transmitting light with minimal loss, essential for telecommunications, medical devices, and laser systems. Advanced Ceramics: High purity silica is a fundamental component in the production of advanced ceramic materials such as silica glass and silicon nitride ceramics. These materials find applications in industries ranging from aerospace and defense to electronics and biomedical. Pharmaceuticals and Cosmetics: Silica with high purity is used as an excipient in pharmaceuticals and cosmetics. It serves various functions including as a flow agent, desiccant, and viscosity modifier in formulations. Chemical Synthesis: High purity silica acts as a catalyst or catalyst support in various chemical reactions and processes. Its high surface area and uniform pore structure make it suitable for applications in catalysis, chromatography, and adsorption. Construction Materials: High purity silica is incorporated into construction materials such as concrete, mortar, and grouts to improve strength, durability, and resistance to environmental factors. It also contributes to the production of high-performance coatings and sealants. Environmental Remediation: Silica with high purity is used in environmental remediation applications such as water filtration and soil stabilization. Its inert nature and high surface area enable efficient removal of contaminants from water and soil.
Features and Applications High Purity: Electronic grade silica sol is produced with extremely high purity levels to minimize impurities that could adversely affect electronic components. This ensures the reliability and performance of semiconductor devices and integrated circuits. Particle Size Control: The particle size distribution of electronic grade silica sol is tightly controlled to meet precise specifications. This uniformity is crucial for achieving consistent results in semiconductor fabrication processes such as chemical mechanical planarization (CMP) and wafer cleaning. Surface Properties: Electronic grade silica sol is designed to have specific surface properties tailored for electronic applications. These properties may include controlled surface charge, stability, and compatibility with other process chemicals. Polishing and Planarization: In semiconductor manufacturing, electronic grade silica sol is used in CMP slurries for polishing and planarization of silicon wafers. It helps achieve smooth and flat surfaces essential for patterning and layer deposition processes. Dielectric Films: Electronic grade silica sol can be used to deposit thin dielectric films on semiconductor substrates through techniques such as spin coating or dip coating. These films act as insulating layers in electronic devices, providing electrical isolation between different components. Passivation and Encapsulation: Silica sol can be employed for passivation and encapsulation of semiconductor devices to protect them from moisture, contaminants, and mechanical damage. The high purity and stability of electronic grade silica sol ensure long-term reliability and performance. Photolithography: Electronic grade silica sol may also be utilized as a photoresist adhesion promoter or anti-reflective coating in photolithography processes. It helps enhance pattern fidelity and resolution during the fabrication of semiconductor circuits. Wafer Cleaning: Silica sol is used in wafer cleaning processes to remove contaminants, particles, and organic residues from semiconductor surfaces. Its high purity and compatibility with other cleaning agents make it an essential component in advanced cleaning solutions.
Modified silica sol refers to a type of colloidal solution where silica nanoparticles are suspended in a liquid medium, typically water. These silica nanoparticles are modified or functionalized with various organic or inorganic compounds to alter their surface properties and enhance their performance in different applications. The modification process can involve chemically bonding organic molecules to the surface of the silica particles, which can impart specific functionalities such as hydrophobicity, oleophobicity, or compatibility with certain polymers or solvents. Inorganic modifications may include incorporating metal oxides or other nanoparticles to enhance properties like catalytic activity or mechanical strength. Modified silica sols find widespread use in various industries such as coatings, adhesives, sealants, composites, and catalysts. They offer advantages like improved dispersion, adhesion, and compatibility, making them valuable additives in many formulations.
Hydrophobic silica is a type of silica material that has been chemically modified to repel or be resistant to water. This modification alters the surface properties of silica nanoparticles, making them less prone to interacting with water molecules. The modification process typically involves treating the surface of the silica nanoparticles with hydrophobic compounds, such as alkylsilanes or fluorosilanes. These compounds form a hydrophobic layer on the surface of the silica particles, effectively blocking interactions with water molecules. Hydrophobic silica finds numerous applications across various industries. For example, it is used as an additive in coatings, paints, and sealants to improve water repellency and durability. In the pharmaceutical and food industries, hydrophobic silica can be used as an anti-caking agent to prevent clumping in powdered products. Additionally, it is utilized in rubber and plastic composites to enhance their water resistance and mechanical properties.
Hydrophilic silica is a type of silica material that exhibits a strong affinity for water. Unlike hydrophobic silica, which repels water, hydrophilic silica readily interacts with and absorbs water molecules. The surface of hydrophilic silica nanoparticles is typically functionalized with hydrophilic groups, such as hydroxyl (-OH) groups. These groups enable the silica particles to form hydrogen bonds with water molecules, promoting their dispersion and solubility in aqueous solutions. Hydrophilic silica has various applications across industries. In the pharmaceutical and cosmetic sectors, it is used as an excipient in formulations to improve the dispersibility and bioavailability of active ingredients. In chromatography, hydrophilic silica is employed as a stationary phase for separating polar compounds. It is also utilized in coatings, paints, and adhesives to enhance their rheological properties and adhesion to substrates.
We are a supplier/ exporter of silica sand / Silicon dioxide SiO2. We can provide all sizes and any amount to worldwide.
Silica sand SiO2 : 99,85 % Al2O3 : 0,09 Fe2O3: 0,008 LOI : 0,04 K2O ; 0,006 TiO2 : 0,015 Cr2O3 : 0,001 MC : 3,61 :
Silica sand From Suriname Extremely Competitive Prices in USD Shipment Quantities: 20 to 12,000 metric tons +- 10% 12,000 tons per month are available to load Washed and can be screened to spec 2 million ton reserves Delivery : FOB Shipment : Container or In bulk Shipment Schedule: Within 30 days of receipt of Buyers acceptable L/C Material: White Beach Silica Sand
A company specializing in the field of import and export of minerals in Vietnam, Hanoi Import-Export JSC would like to send respectful greetings to our valued customers and wish you good health and success. Currently, we have a source of Silica sand, originally from Vietnam, for export. We have full export licenses and related documents and we can send our offers to interested customers.
Glass Grade Foundary Grade Chemicals Paints Cement Construction
We are a mining company and we export our products abroad, we can supply any quantity of silica sand all specifications.
We sell good quality of silica sand. Silica is about 99.4 - 99.7% Fe is about 0.024 - 0.016 We sell in bulk, the quantity is 50,000 MT or more each month. Located in Riau Island of Indonesia. Term of payment is by cash/TT. Please note that we can't do: - send by container - packing in polybag - No CIF and only can do FOB! Question always ask: How do we ensure the quality meets the specifications we want? Answer: We invite you to carry out a Pre Shipment Analysis before we load it into the mother vessel!
Low Iron Silica Sand
