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fume silica

Name: fume silica
Brand: Lexen Industries and Minerals
Price: 15.0 INR
Availability: InStock

Price 15.0 INR/ Ton

Get a Price/Quote

MOQ : 10 Tons

fume silica Specification

Form
Fine, white, free-flowing powder

Hardness (%)
N/A as a powder, Mohs hardness 5.5-6 for SiO2

Melting Point
>1700C

Surface Finish
Fine powder, high surface area (~200 m2/g)

Usage & Applications
Paints, coatings, adhesives, sealants, silicone rubber, cosmetics, food additives, pharmaceuticals

Water Absorption
Hydrophilic grades absorb water readily

Density
2.2 Gram per cubic centimeter(g/cm3)

Chemical Composition
Amorphous silicon dioxide (SiO2), typically >99.8%

Purity(%)
>99.8%

Application
Used as reinforcing filler in silicone elastomers, viscosity adjustment, free-flow agent, and thickening agent in paints, coatings, adhesives, and sealants

Product Type
Fumed silica powder

Types of Refractories
Not classified as a refractory, but used as an additive in refractory applications

Shape
Ultrafine, amorphous, spherical particles

Porosity
Highly porous structure; primary particle size is 7-40 nm

Dimensional Stability
Excellent dimensional stability

Strength
High tensile and compressive strength as an additive

Specific Gravity
2.2 g/cm3

Thermal Conductivity
Extremely low, approximately 0.02 W/mK

Color
White

Surface Area (BET)
150 - 400 m2/g

Particle Size
7 - 40 nm (primary particles)

Surface Treatment
Available in untreated (hydrophilic) and treated (hydrophobic) types

Loss on Ignition (at 1000C)
<2%

pH Value (at 4% dispersion)
3.6 - 4.5

Oil Absorption
~300 g/100 g silica

CAS No.
112945-52-5

fume silica Trade Information

Minimum Order Quantity
10 Tons

Supply Ability
500 Tons Per Month

Delivery Time
7 Days

About fume silica

Silica fume prices vary significantly by grade (densified, undensified, purity), quantity (kg vs. ton), and supplier, generally ranging from around 12/kg to 25/kg for bulk construction grades, with higher purity or specialized fumed silica costing much more (e.g., 300+/kg or higher for specialty types). Expect bulk prices in the range of 15,000 to 50,000 per Metric Ton (MT) for industrial use, while small quantities or premium grades can reach several hundred rupees per kilogram.

Typical Price Ranges:

Industrial/Construction Grade (Bulk): 12 - 25 per kilogram (or 12,000 - 25,000 per MT) for standard microsilica/silica fume.
High Purity/Specialty Fumed Silica: Can range from 300 to over 600+ per kilogram, depending on the manufacturer and application (e.g., lab use, cosmetics).
Small Quantities (e.g., 450g/1kg): May cost 200 - 400+ per unit, reflecting retail packaging and handling.

Factors Influencing Price:

Grade: Densified (easier to handle) vs. Undensified (lower cost).
Purity: Higher

content (e.g., 90%, 94%, 99%) increases price.
Bulk Density: Lower bulk density typically means higher cost.
Quantity: Prices per kg drop significantly when buying tons (MT).
Application: Construction, refractories, food/pharma, or lab use.

Unmatched Versatility for Industrial Applications

Fumed silica excels as a reinforcing filler, thickener, and flow enhancer in numerous sectors, from paints and coatings to silicone rubber and adhesives. Its unique ultrafine particle size (7-40 nm) and expansive surface area (150-400 m2/g) provide exceptional performance, including high tensile strength, improved processability, and enhanced viscosity control.

Tailored Surface Chemistry for Diverse Needs

Available in both hydrophilic (untreated) and hydrophobic (treated) variants, fumed silica allows formulators to select the optimal grade for water- or oil-based systems. The hydrophilic type readily absorbs water, making it ideal for polar formulations, while the hydrophobic form improves stability and dispersion in non-polar media.

Quality, Purity, and Consistency

Manufactured to a purity higher than 99.8%, fumed silica boasts outstanding chemical stability and safety. Its fine, free-flowing white powder form guarantees consistency in mixing and dosing, ensuring reliable results across pharmaceuticals, cosmetics, food additives, and industrial applications.

FAQ's of fume silica:

Q: How is fumed silica typically used in paints, coatings, and adhesives?

A: Fumed silica acts as a thickening, anti-settling, and free-flowing agent in paints, coatings, and adhesives. Its ultrafine particles increase viscosity, improve suspension stability, and prevent pigment settling, resulting in superior application and finish.

Q: What benefits does fumed silica offer as a reinforcing filler in silicone elastomers?

A: Adding fumed silica to silicone elastomers significantly enhances tensile and compressive strength, extends product life, and boosts heat and dimensional stability, making it indispensable in high-demand formulations.

Q: When should hydrophilic versus hydrophobic fumed silica be selected?

A: Choose hydrophilic fumed silica for formulations that interact well with water, such as aqueous coatings or adhesives; opt for hydrophobic grades in non-polar systems like silicone oils or to improve moisture resistance, as the surface treatment alters compatibility and performance.

Q: What is the process of incorporating fumed silica into formulations?

A: Fumed silica is typically added during the mixing phase under high shear to ensure uniform dispersion. It is important to gradually incorporate the powder to minimize agglomeration and achieve optimal thickening or reinforcing effects.

Q: Where is fumed silica commonly applied in manufacturing and formulation industries?

A: It is broadly used across industries in India and globally, especially in paints, coatings, adhesives, sealants, silicone rubber, cosmetics, pharmaceuticals, and even food processing as a flow agent or thickener.

Q: How does the particle size and surface area of fumed silica impact its performance?

A: A primary particle size of 7-40 nm and a surface area up to 400 m2/g allow fumed silica to create a network within formulations, dramatically increasing viscosity, stability, and reinforcement without affecting color or clarity.

Q: What distinguishes fumed silica from other silica types in terms of benefit and application?

A: Fumed silica offers higher purity (>99.8%), finer particle size, and significantly greater surface area compared to precipitated or natural silicas. This unique profile delivers better thickening, reinforcement, and flow properties, making it a superior additive across diverse applications.

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