SILICA

Silica For Animal Feed

The silicon dioxide used in animal feed is mostly produced through precipitation. It has no toxic side effects and is commonly used as a flow and anticaking agent in various feed premixes and trace

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Silica For Silicone Rubber

Why add fumed silica to silicone Rubber?Our fumed silica in silicone rubber improves mechanical strength. Silicone rubber is aging-resistant, high and low temperature resistant and

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Precipitated Silica

The chemical compound precipitated silica is a form of synthetic amorphous silicon dioxide produced by precipitation from a solution containing silicate salts. It appears as a white, fluffy, and fine

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Rice Husk Silica

The product is made from renewable resources such as rice husk and straw using the carbon dioxide acidification process to produce bio-based silica (also known as bio-based white carbon black / rice

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How is Silica Used in Industrial Processes?

Silica (silicon dioxide, SiO₂) is one of the most widely used industrial minerals in the world. Its high melting point, chemical inertness, controlled particle size, and mechanical strength make it indispensable across a broad range of industrial processes.
From glass manufacturing and metal casting to water filtration and hydraulic fracturing, silica plays a critical role in nearly every major industry. Below are eight key industrial processes where silica is essential.

What is The Difference Between Silica And carbon black?

Silica (SiO₂) and carbon black are the two most widely used reinforcing fillers in the rubber industry. While both are added to rubber compounds to improve mechanical properties, they differ fundamentally in chemical composition, surface chemistry, color, reinforcement behavior, and end-use performance.
Understanding these differences is critical for compound formulators, tire manufacturers, and industrial buyers selecting the right filler system.

What Are The Properties of Silica?

Silica, or silicon dioxide (SiO₂), is one of the most abundant and versatile industrial minerals on Earth. Its unique combination of high hardness, excellent thermal stability, chemical inertness, and controllable surface chemistry makes it indispensable across glass, ceramics, foundry, construction, coatings, rubber, electronics, and pharmaceutical industries.
Understanding the physical and chemical properties of silica is essential for selecting the right grade and form for your specific application. Below is a comprehensive overview of the key properties that matter most to industrial buyers and formulators.

What about the packing for silica ?

Packaging is a critical part of silica supply. The right packaging protects product quality, ensures safe handling, complies with international regulations, and supports efficient logistics. Silica is typically packaged in 25 kg bags, jumbo bags, fiber drums, or bulk tankers, depending on the product form, grade, and customer requirements.

Application of Silica

Glass & Fiberglass Manufacturing

Silica is the primary raw material in glass production. It provides transparency, strength, thermal resistance, and chemical durability. It is widely used in flat glass, container glass, fiberglass, glass wool, and specialty glass. High-purity silica helps improve melting efficiency and final product clarity.

Ceramics, Tiles & Refractories
In ceramics, silica improves strength, whiteness, thermal shock resistance, and dimensional stability. It is used in wall and floor tiles, sanitary ware, tableware, technical ceramics, and refractories. For high-temperature applications, silica helps extend service life and maintain structural integrity.

Foundry & Precision Casting
Silica sand is a key molding and core material in foundry casting. It offers excellent refractoriness, high hardness, and good permeability. It is widely used in iron, steel, aluminum, and precision casting. Controlled grain size and low impurity levels help reduce casting defects and improve surface finish.

Construction & Building Materials
Silica is used in concrete, mortar, grouts, dry-mix products, and engineered stone. It improves compressive strength, durability, abrasion resistance, and weather resistance. As a functional filler, it also enhances workability and reduces shrinkage in cement-based systems.

Rubber, Plastics & Composites
Silica is an important reinforcing filler in rubber and plastics. It improves tensile strength, tear resistance, abrasion resistance, and aging performance. It is widely used in tires, shoe soles, silicone rubber, engineering plastics, and composite materials. It can also help reduce formulation costs while maintaining performance.

Selection of the right SILICA

Selecting the right silica is critical to product performance, regulatory compliance, and cost efficiency. With numerous forms, grades, and specifications available — from crystalline quartz sand to amorphous fumed silica — the choice can be overwhelming. The wrong selection can lead to processing issues, product defects, or compliance failures.
This guide walks you through the key decision factors for choosing the optimal silica for your specific application..

Understand Your Application Requirements

Start by defining what your application actually needs. Key questions:
• What is the end product? (glass, rubber, coating, pharmaceutical tablet, etc.)
• What is the primary function of silica? (reinforcement, filler, anti-caking, filtration, rheology control, etc.)
• What are the critical performance properties? (hardness, whiteness, thermal stability, surface area, etc.)
• What regulatory standards apply? (industrial, food-grade, pharma-grade, REACH, FDA, etc.)

Choose the Right Silica Form

Silica comes in several distinct forms, each with unique properties and best-fit applications. Fused silica, fumed silica, precipitated silica, silica gel, silica sand etc.

Rule of thumb:
• Need bulk structural strength? → Crystalline quartz sand
• Need reinforcement in rubber? → Precipitated silica
• Need thickening or anti-settling? → Fumed silica
• Need optical purity? → Fused silica
• Need moisture absorption? → Silica gel

Determine the Right Grade & Specifications

Within each form, you must specify purity, particle size, surface area, and other parameters.Evaluate Surface Treatment & Functionalization.Evaluate Surface Treatment & Functionalization.Check Regulatory & Compliance Requirements

Consider Packaging, Logistics & Cost

Silica is hygroscopic, so packaging and storage conditions matter.
• Packaging: 25 kg bags, jumbo bags, fiber drums, or bulk tankers — choose based on volume, handling, and moisture sensitivity.
• Logistics: Consider freight cost, container loading efficiency, and distance from supplier.
• Cost: Carbon black is cheaper per tonne, but silica may offer performance benefits that reduce total system cost.
• Supplier reliability: Consistent batch quality, lead times, and technical support are as important as price.

Is Silica Used in Food or Pharmaceutical Industries?

Yes — but only specific grades of silica are suitable for these industries.
Food and pharmaceutical manufacturers use food-grade silicon dioxide, synthetic amorphous silica (SAS), colloidal silicon dioxide, precipitated silica, and silica gel. These grades must meet strict regulatory and quality standards, such as FCC, E551, USP/NF, EP, JP, FDA 21 CFR, and GMPrequirements.
It is important to note that not all silica is food-grade or pharma-grade. Industrial silica, quartz sand, foundry sand, and crystalline silica are not intended for food or pharmaceutical use.

What Are The Safety Precautions To Take While Handling Silica ?

Handling silica safely is critical to protecting worker health and meeting regulatory requirements. The primary health risk comes from respirable crystalline silica (RCS) — tiny dust particles generated during cutting, grinding, drilling, or handling that can be inhaled deep into the lungs.

Prolonged exposure can cause silicosis, an irreversible and potentially fatal lung disease, as well as lung cancer, COPD, and other serious conditions.

What is the composition of Silica ?

The composition of silica is defined by its chemical formula SiO₂ — one silicon atom bonded to two oxygen atoms. Silica has a molecular weight of 60.08 g/mol and exists in both crystalline and amorphous states, in natural environments and as manufactured products. It is odorless, has no vapor pressure, and produces non-explosive dusts when particles are suspended in air.
Understanding silica’s composition is essential for industrial buyers because it determines purity, performance, safety classification, and suitability for specific applications.

What is The Recommended Storage Condition For Silica?

Silica (SiO₂) is chemically inert and extremely stable, but it is highly hygroscopic — meaning it readily absorbs moisture from the surrounding atmosphere. Due to its high specific surface area, silica can also absorb volatile organic compounds from the air, which may affect product performance.
Proper storage is therefore not merely a logistical detail — it is an essential requirement to maintain silica’s low moisture content, purity, and performance characteristics across applications ranging from rubber reinforcement to pharmaceuticals.

How To Improve The Stability of Accelerator

Choose high-quality accelerator raw materials, such as chemicals with high purity and good stability. Strengthen production and quality control, strictly control the production process, and ensure that parameters such as temperature, pressure, and reaction time during the accelerator production process are reasonably and stably controlled. According to the needs of different application fields, combined with the product characteristics and physical and chemical environments of different application fields, optimize the accelerator formula. By coating the accelerator, its service life can be extended and its stability can be maintained. Pay attention to storage conditions, such as avoiding light, moisture, and high temperatures. At the same time, choosing appropriate packaging materials can effectively avoid the contamination and volatilization of accelerators. Adding a certain amount of antioxidants to the accelerator can improve the stability of the accelerator and extend its service life.

FAQ

Q: What is silica?

A: Silica, or silicon dioxide (SiO₂), is a naturally occurring mineral composed of silicon and oxygen. It is widely used in glass, ceramics, foundry, construction, coatings, rubber, and filtration.

Q: What are the main types of silica?

A: Common forms include crystalline quartz / silica sand, fused silica, precipitated silica, fumed silica, colloidal silica, and silica gel. Each form has different properties and applications.

Q: What is the difference between crystalline and amorphous silica?

A: Crystalline silica has an ordered atomic lattice, such as quartz. Amorphous silica has a disordered structure, such as fumed or precipitated silica. They differ in solubility, surface area, and health classification.

Q: What are the physical properties of silica?

A: Typical values: formula SiO₂, molecular weight 60.08 g/mol, density 2.65 g/cm³ for quartz, melting point 1710 °C, Mohs hardness 7, insoluble in water, and very low thermal expansion.

Q: What are the chemical properties of silica?

A: Silica is chemically inert, insoluble in most acids, reacts with hydrofluoric acid (HF), and is slowly attacked by strong alkalis. Its surface contains silanol (Si–OH) groups.

Q: What are the main benefits of silica?

A: Key benefits include high purity, thermal stability, chemical inertness, reinforcing performance, controlled particle size, electrical insulation, and cost-effectiveness.

Q: What are the main applications of silica?

A: Silica is used in glass, fiberglass, ceramics, refractories, foundry casting, construction, water filtration, paints, coatings, adhesives, rubber, plastics, food, and pharmaceuticals in specific grades.

Q: Is silica used in food or pharmaceutical industries?

A: Yes, but only food-grade or pharma-grade amorphous silica. It is used as an anti-caking agent, glidant, carrier, adsorbent, and suspending agent. Industrial and crystalline silica are not intended for food or pharma use.

Q: What is the difference between silica and carbon black?

A: Silica is white, polar, and electrically insulating. Carbon black is black, non-polar, and electrically conductive. Silica improves wet grip and rolling resistance; carbon black offers higher abrasion resistance and tensile strength.

Q: What safety precautions should be taken when handling silica?

A: Use engineering controls such as wet methods and local exhaust ventilation. Wear PPE including an N95 respirator, gloves, and safety goggles. Avoid dry sweeping and compressed air. Use HEPA vacuums and follow the SDS.

Q: What is the recommended storage condition for silica?

A: Store silica at 15–25 °C with relative humidity below 50%. Keep it in sealed, moisture-proof packaging, on pallets, away from volatile organic substances. Typical shelf life is 24 months.

Q: What are the standard packaging options for silica?

A: Standard packaging includes 25 kg PP woven bags, multi-wall paper bags, jumbo bags of 500–1200 kg, fiber drums, and bulk tankers. PE inner liners and private labeling are available.

Q: How do I select the right silica for my application?

A: Consider your application, required function, silica form, purity, particle size, surface area, surface treatment, regulatory compliance, packaging, and cost. Ask your supplier for technical consultation.

Q:What is the shelf life of silica?

A: Precipitated and fumed silica typically have a 24-month shelf life. Industrial silica sand or powder has no strict shelf life if kept dry and sealed. Re-test moisture content after long storage.

Q: Do you provide samples, COA, TDS, SDS, and custom specifications?

A: Yes. we provides free samples for qualified buyers, batch-specific COA, TDS, SDS, and custom grades, particle sizes, surface treatments, and packaging. Contact us for details.

As one of the most professional silica suppliers in China, we're featured by quality products and competitive price. Please rest assured to buy or wholesale silica made in China here from our factory. Also, customized service is available.