Colloidal silica for
1 colloidal Silica belongs to adhesive ,liquid silica.
2 It is odorless, tasteless and non-toxic.
3 Its chemical molecular formula is mSiO2.nH2O.
4 Since the colloid grains are minute (10-20nm) and have relatively
larger specific surface area, the grains themselves are colorless
and transparent, so they do not affect the natural color of the
materials to be covered.
5 With low viscosity, it can soak the places where water soaks,
therefore, it shows excellent dispersion and permeability when
mixed with other substances.
6 When the moisture contained in colloidal silica is evaporated,
the colloid grains firmly adhere to the material surface and the
combination of silicon and oxygen is then formed between grains. It
is a good adhesive.
Chemical Composition of Colloidal Silica
|ITEM||SiO2, %||Na2O, % ≤||pH value||Viscosity (25),mp a.s ≤||Density (25),g/cm3||Average particle diameter,nm|
♦ Used as the cohesive agent for various fireproof materials. It has
high bounding strengthe and high heat-resisting
♦ Used in coating industry. It makes the paintsfirm. It also
possesses features, such as anti-contamination, dustproof,
anti-aging, fireproof, ect.
♦ Used in precision casting of thin covers to increase the cover
strength, improve the casting smooth finish. Its molding quality is
better than that of water glass. It can be used to replace ethy l
silicate for molding so as to reduce the costs and help improve the
♦ Having large specific surface area, silica sol can be used for
making catalyst and as catalyst carrier.
♦ Used in paper-making industry. It can be used as the
anti-glutinous agent of cellophane, pre-treatment agent of
photopraphic paper, skidproof agent of cement bags,etc.
♦ Used as sizing agent in textile industry. When used with oil of
photographic paper, skidproof agent to processs wool and rabbit
hair, it helps improve the processing of wool and rabbit hair,
reduce the economic returens.
♦ Used as the treatment agent of silicon steel plates, dispering
agent of kinescope and skidproof agent of floor waxes,etc.
♦ Silica content 40% of alkaline silicon sol and can be used for
refractory material and polishing processing
♦ Ammonia stable silica sol is mainly used in ceramic fiber and
catalyst carrier .