Overview of Fumed Silica

Fumed silica, also known as pyrogenic silica, is an ultra-fine, high-purity amorphous silicon dioxide (SiO2) produced via the combustion of silicon tetrachloride in an oxygen-hydrogen flame. It appears as a fluffy white powder and is valued for its ability to thicken, stabilize, and reinforce materials.

Features of Fumed Silica

• High Surface Area: Typically ranges from 50 to 380 m²/g, providing excellent thickening and reinforcing properties.
• Hydrophilic or Hydrophobic Variants: Available in both forms depending on surface treatment, allowing for tailored applications.
• Excellent Thixotropy: Increases viscosity and improves flow properties of liquids and pastes.
• Chemical Inertness: Resistant to most chemicals, making it suitable for a wide range of industrial uses.

•  Enhances free-flowing properties and stability.

(Undensified fume silica hydrophobic microsilica fume)

Specification of Undensified fume silica hydrophobic microsilica fume

Undensified fume silica hydrophobic microsilica fume is a high-performance material acquired as a byproduct of silicon steel or ferrosilicon alloy production. This ultra-fine, amorphous silica powder is refined to achieve hydrophobic residential properties, making it resistant to moisture absorption and perfect for applications requiring enhanced durability in humid or damp settings. Its undensified kind ensures a reduced mass thickness and high area, enhancing reactivity and dispersion in different matrices.

** Chemical Structure **: The product consists primarily of silicon dioxide (SiO ₂), typically surpassing 90% pureness, with trace quantities of carbon, iron, aluminum, calcium, and various other oxides. The hydrophobic therapy includes surface adjustment using silane or silicone-based agents, developing a water-repellent layer without jeopardizing its chemical security.

** Physical Properties **: The particles are very great, averaging 0.1– 0.3 microns in size, with a certain area of 15– 35 m ²/ g (wager approach). The undensified framework leads to a bulk thickness of 200– 350 kg/m ³, ensuring very easy handling and reliable assimilation into mixes. Its hydrophobic nature minimizes clumping and makes sure free-flowing actions also in high-humidity conditions.

** Applications **: Commonly used in building and construction, coatings, polymers, and refractories, it improves mechanical stamina, abrasion resistance, and chemical resilience. In concrete, it serves as a pozzolanic filler, decreasing permeability and boosting resistance to chloride access and sulfate attack. In layers and adhesives, it boosts rheology, thixotropy, and UV security. The hydrophobic properties make it appropriate for waterproofing systems, sealants, and composites exposed to wetness.

** Efficiency Perks **: High reactivity as a result of amorphous structure and fine fragment dimension guarantees effective binding with cementitious or polymeric matrices. The moisture resistance extends service life and avoids early treating in storage. Its reduced ionic pollutant content minimizes rust risks in strengthened concrete.

** Product packaging & Storage Space **: Supplied in moisture-resistant, multi-layer paper bags or bulk containers to maintain stability. Shop in dry, great conditions away from direct sunlight.

** Safety and security **: Inhalation of air-borne particles might position respiratory system dangers; usage PPE (masks, gloves) throughout handling. Complies with OSHA, REACH, and various other worldwide safety and security standards.

This product is a functional additive for sectors focusing on longevity, water resistance, and high-performance product design.

(Undensified fume silica hydrophobic microsilica fume)

Applications of Undensified fume silica hydrophobic microsilica fume

Undensified fume silica hydrophobic microsilica fume, a finely split, amorphous silicon dioxide powder, is a flexible product obtained as a byproduct of silicon metal and ferrosilicon alloy production. Its undensified form makes certain a low bulk density and high surface, while its hydrophobic nature– attained with surface area treatment– gives outstanding moisture resistance. These residential or commercial properties make it important throughout varied markets.

In ** high-performance concrete and construction **, microsilica enhances resilience and toughness by filling up tiny spaces in between concrete bits, minimizing leaks in the structure. Its hydrophobicity protects against water absorption, perfect for marine frameworks, bridges, and infrastructure subjected to extreme weather. The product additionally boosts abrasion and chemical resistance, prolonging the lifespan of concrete.

** Coatings and paints ** take advantage of its water-repellent, where it serves as an additive to increase weather resistance, lower deterioration, and boost texture. It is used in protective finishings for steel surface areas, outside paints, and anti-graffiti surfaces, ensuring lasting efficiency in damp or wet environments.

In ** polymers and compounds **, hydrophobic microsilica improves mechanical residential properties, thermal security, and flame retardancy. It is added to silicone rubber, epoxy materials, and vehicle components to reduce shrinkage, boost dimensional security, and resist moisture-induced degradation, critical for electronics and outside applications.

** Adhesives and sealants ** utilize its hydrophobicity to prevent water ingress, making certain solid bonds in damp conditions. It boosts viscosity control and durability in construction sealers, automotive adhesives, and industrial grouts.

** Refractory materials ** utilize microsilica to boost thermal shock resistance and toughness in high-temperature cellular linings for furnaces and kilns. Its undensified type help in producing light-weight, permeable structures, while hydrophobicity stops moisture absorption throughout storage.

In the ** oil and gas industry **, it serves as a rheology modifier in drilling liquids, minimizing water absorption and supporting boreholes. Its inertness and great bit dimension improve liquid performance in difficult environments.

Additional applications include ** porcelains ** (boosting eco-friendly toughness and sintering), ** cosmetics ** (texture modification in powders), and ** pharmaceuticals ** (circulation help in tablet computer manufacturing). The undensified framework ensures optimal reactivity and diffusion, while hydrophobicity broadens usability in moisture-sensitive contexts.

By repurposing a commercial result, undensified hydrophobic microsilica sustains sustainable practices, providing cost-efficient, high-performance remedies across fields demanding toughness, water resistance, and improved material buildings.

Company Introduction

Welcome to HiphopGalaxy, a trusted global supplier of high-quality silicon dioxide (SiO2) powder, renowned for its exceptional purity and performance. Established with a vision to deliver cutting-edge materials that meet the diverse needs of modern industries, we have positioned ourselves as a leading player in the international market.

Our SiO2 powders find applications across multiple sectors, including adhesives, coatings, pharmaceuticals, cosmetics, polymers, and electronics. Each application benefits from the unique properties of our products—high surface area, excellent thixotropy, chemical inertness, and superior reinforcement capabilities. Whether you need hydrophilic or hydrophobic variants, we offer tailored solutions to meet your specific requirements.

If you have any questions, please feel free to contact us(nanotrun@yahoo.com).

Payment Methods

T/T, Western Union, Paypal, Credit Card etc.

Shipment Methods

By air, by sea, by express, as customers request.

5 FAQs of Undensified fume silica hydrophobic microsilica fume

Undensified fume silica hydrophobic microsilica fume is a fine, amorphous silica powder produced as a byproduct of silicon metal or ferrosilicon alloy production. It remains in its loose, non-compacted form (undensified) and undergoes hydrophobic treatment to repel water. This material is used in high-performance concrete, coatings, adhesives, and composites to enhance strength, durability, and resistance to moisture and chemicals.

Common applications include construction materials like ultra-high-performance concrete (UHPC) to reduce permeability and increase compressive strength. It’s also used in polymers, ceramics, and refractory materials for improved thermal stability and mechanical properties. In coatings, it provides anti-settling, anti-sagging, and UV resistance. The hydrophobic nature makes it ideal for environments exposed to moisture or harsh weather.

Compared to densified silica fume, the undensified version has a higher surface area and better dispersion in matrices due to its fluffy, unaggregated particles. This improves reactivity and bonding in composites. The hydrophobic treatment prevents clumping during storage and ensures consistent performance in humid conditions. Densified silica fume requires additional processing, which can reduce effectiveness in certain applications.

Handle undensified hydrophobic microsilica fume using standard PPE (gloves, masks, goggles) to avoid inhalation or contact. Store in a dry, cool place in sealed containers to maintain its hydrophobic properties. Although moisture-resistant, prolonged exposure to humid environments should be avoided. Use ventilation in workspaces to minimize airborne particles during mixing or pouring.

While non-toxic, inhaling fine particles can irritate the respiratory system. Skin contact may cause dryness. Follow OSHA or local safety guidelines, including using NIOSH-approved respirators and ensuring proper workplace ventilation. Spills should be cleaned with vacuums or damp cloths to prevent dust dispersion. Always review SDS (Safety Data Sheet) before use.

(Undensified fume silica hydrophobic microsilica fume)