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Application of Fumed Silica

Application of Fumed Silica
It is used as a filling agent in dozens of applications, due largely to unique properties of the particles: ultra
fine size, homogeneity, spherical shape and utmost purity. When added in liquids, it causes thickening effect
that is of significant importance for the production of lubricants, lacquers, paints, glues and medicines.
1.Adhesives and sealants
Fumed silica is effective and integral component in adhesive and  sealant  systems.  With  addition  in  glues,  it  prevents sedimentation, enhances viscosity, provides less setting time, reduces stretching of fibres (filaments) in glues and increases adhesive power dramatically. Apart from thickening effect, fumed silica secures the desired mechanical strength of a sealant when the latter is cured.  

Silicone sealants feature the following particular traits:
• Good weatherability and resistance in aggressive environment
• Enhanced adhesion to most of construction materials without priming
• Excellent movement accommodation (no less than 20%)
• Improved thermal and cold resistance - maintains performability (remains resilient and elastic) within temperatures -50° to +200°C
• Easy handling in wide temperature ranges (surface applications -30° to +60°C)
2. Pharmaceuticals and cosmetics
In pharmacy, the product has found its application as an inert carrier and stabiliser of the active ingredient.
The silica provides desired consistency for pastes and ointments and prevents separation of components as well. Also, it is used as an auxiliary for the production of drops and pills.
In medical applications, the most crucial advantage is that all the substances  adsorbed  on  surface  of  the  silica  before,  e.g.  in medicines, are then desorbed gradually and completely in aqueous environment  of  human  body,  thus  securing  lasting  effect  and enhancing performance of medicines.
Fumed silica is an enterosorbent, i.e. an agent that absorbs and removes substances harmful and toxic to the body from intestinal tract.

Thanks to its absorbing ability, the silica outperforms greatly all the existing medical sorbents. Binding rate for micro-organisms accounts for up 3 billion microbes in 1g of the sorbent. This extraordinary absorbing effect is conditioned by the phenomenon of micro-organisms’ agglutination via particles of the silica.
Fumed silica is used on large scale in the production of toothpaste. It keeps teeth enamel safe providing excellent polish and serves as a carrier of active ingredients in gel toothpaste.
3.Manufacturing of Plastics
Glass-fibre plastics are used exceptionally for the fabrication of plastic frames in shipbuilding, for which raw materials like unsaturated polyesters (UPRs) and reinforcing glass fillers are required:

-in low-viscosity polyester resins with good wet-in features, fumed silica promotes levelling and prevents cracking and sagging during the manufacturing of polyester-based glass fibre plastics.
-fumed silica delivers thixotropic properties to polyester and epoxy resins. Also, it can be used as anti-blocking agent in polymer films. In the production of PVC resins, the silica enables to adjust their operating viscosity.
4. Paints and lacquers
Here, fumed silica functions as a stabiliser and anti-settling agent of pigments  and  as  an  anti-sedimentation  additive.  It improves thixotropic and rheological properties of coatings and paint systems, retains original transparency of lacquers. Furthermore, addition of the silica enhances hardening of coating film, adhesion to surfaces, as well  as  reduces  deterioration  rate  of  the  coatings  and  fading  of materials with transparent top coating.
Besides, it helps to prevent run-off and sag of paints applied on vertical surfaces, thus ensuring top quality levelling. The silica is used as a matting agent of lacquer systems, whereas the desired effect may be adjusted within wide ranges.
5. Rubber industry
Fumed silica is active reinforcing filler used in the production of silicon rubbers. Primarily, the silica makes it easier to prepare rubber mixtures by reducing sticking to the rollers. It is the most significant additive designed to acquire lightweight durable and high quality colour rubbers used in the manufacturing of soles, rubber cloths, sanitation and hygiene items, etc.
-fumed silica is easy to be mixed and disperses freely in rubbers.
It can be utilised in the following technological processes and products:
- in rubber-fabric articles to assure enhanced durability (hosepipes, belts, conveyors); - in the fabrication of neoprene- and SKN-based items which are oil- and gas-proof. - items subject to repeatedly bending (conveyor belt, rubber hoses)

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