Aluminium Silicate

Aluminium Silicate

We are one of the major Exporters of Aluminium Silicate in the market. Aluminium Silicate which is chemically denoted as Al2 Si O3 is commonly used as filler as well as anti settling agent in paint. It is also used as semi reinforcing agent in rubber. Aluminium Silicate is available in two of its major forms i.e. Sodium Aluminium Silicate and Potassium Aluminium Silicate. " We also manufacture sodium aluminium silicate UNISIL NK-20 AHS which is used as titanium dioxide replacement in matt emulsion paints".

Advantage of Our Products in Paints :

  • Higher degree of whiteness and hiding power of the paint once applied (when dry). Greater development of the degree of whiteness of the white pigments used.
  • Cost reduction in the formula, especially when titanium dioxide is substituted. Up to 20%-30% in weight of the white pigments used can be substituted.
  • Increased stability of the paint during storage over long periods. It acts as an anti-settling agent and a regulatory agent of the viscosity and of the pH.
  • Gives exterior paints good weathering properties and reduces its tendency to dirt pick-up.
  • Part of white pigment like Titanium-dioxide (10% or more) can be replaced without loss of opacity.
  • Give faster surface and through-drying in product which also stand up better to abrasive treatment.
  • Excellent substrates for high gloss finishes as they ensure good levelling out.
  • Act as anti-setting agents for pigments and fillers. The viscosity of decorative paints containing our product is highly constant over extended periods of time. Being basic, they also have positive effect on storage stability.
  • Give excellent thicksotropy and facilitate dripless application.

Advantages in Rubber :
The particles of the filler used interact with the polymer, thus changing the properties of the mix and vulcanized material. For a filler with definite chemical composition, this interaction becomes more intensive as the surface area of the filler particles increases.Due to fine micronization of our products, they have very large surface area and thus give excellent properties in terms of tensile strength, modulus and resistance to tear and abrasion. They are particularly suitable for soling and microcellular sheets as they give relatively fast cures and enable production of soling materials to be streamlined.

Physiochemical Properties







Specific surface area



Mean particle size



Tamped density (after storage)



Loss on drying (2 hrs at 105o)



Loss on Ignition (2 hrs at 1000oC)

% max


pH value



DBP absorption



SiO2 content



Al content as Al2 O3



Na content as Na2O



Fe content as Fe2 O3



Sulfate content as SO3

% max


Sieve residue 45 o­m

% max





Typical Physiochemical Properties of Aluminium Silicates

Aluminium Silicate is first precipitated in large tanks. It is then filtered and washed dried and micronized on most modern plant to prevent contamination. Our R&D department has developed the precipitation process to provide accurate control of particle size and surface area. The properties have been optimized in our different grades according to the application.

Property Unit Super Special Grade Special Grade Super Grade Comm. Super Grade General Grade
Bulk Density* gm/cc 0.20-0.25 0.24-0.28 0.30-0.35 0.35-0.40 0.40-0.46
pH Value Micron 9 to 10 9 to 10 8.5 to 9.5 8 to 9 7 to 8
Average particle size % 5 to 6 5 to 6 5 to 6 5 to 6 6 to 8
Residue on 700 mesh %(max) 1.0 1.0 1.0 1.0 1.0
Water absorption % 95-105 70-80 60-70 50-60 35-45
SiO2 % 68 64 61 58 60
Al2O3 % 17 20 24 28 30
Na2O %(max) 0.05 0.06 0.05 0.05 0.05
Moisture %(max) 3.0 2.0 1.5 1.5 0.5
Packing Kgs/bag 12.5 15 18 20 25