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Precipitated Silica |
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The company provides the best quality Precipitated Silica for various industrial applications. Precipitated Amorphous Silica has high surface area and Oil/ Water Absorption with low bulk density. Apart from that, we are one of the major Biochemically Precipitated Silica Suppliers in India.
We are the global leaders today in the manufacture of precipitated calcium silicates having following unique properties:
Very High Water / Oil Absorption : Upto 600% has been achieved and efforts are in progress to achieve the 800% mark. Most competing products have water-absorption upto 300% maximum only. - Very Low Bulk Densities :Upto 0.04 gm/cc has been achieved whereas competing products have 0.12 gm/cc minimum.
- Very High Surface Areas : Upto 600 m2/gm has been achieved.
PRODUCTION FACILITIES
Precipitation is carried out in microprocessor controlled batch reaction vessels, followed by filler-presses/vaccum filters and flash/spray driers and finally micro-mill with classifier for micronization wherever required.
APPLICATIONS (PRECIPITATED SILICAS)
UNISIL NK precipitated silicas having high absorption capacities can be used to provide one or several of the following properties:
- Free - flow
- AnticakingReinforcement
- Rheology Control
- Thixotropy
- Flatting
- Insulation
- Suspension
- Carrying Agent
- Matting
- Lightness
- Inert filler
PESTICIDES
- For improvement in the suspension power and as a carrier for the active igredients, specially malathion, acephate and isoproton
- Based formulations.
- For improvement of free-flow characteristics and storage stability.
- As a grinding auxillary.
- Pesticides Industry is one of the largest consumers for UNSIL NK grades which Provide excellent results and improve quality.
FEEDSTUFFS & FOOD ITEMS
- Improvement in free-flow properties and storage stability of table salt, spices etc.
- Anticaking of milk extenders and fat concentrates, feedstuff urea & mineral mixtures.
- Conversion of 75% acqueous choline chloride solution into stable 50% powder form.
- Conversion of liquid active substances into powder form, e.g. ethoxyquin, flavours & fragrances.
CHEMICALS
- Conversion of liquids to free flowing powder form (e.g. SP antioxidant & other rubber chemicals).
- As a grinding aid (e.g. with sulphur).
- For anti-caking & free flow. (e.g. Detergents).
PLASTICS & POLYMERS
- To provide reinforcement properties in PP, PVC, PE and Polystyrene based master batches.
- As an anti-blocking agent in blown films & foils.
- Improvement in the mechanical characterstics of PVC flooring.
- With Phenol + melamine resins for anti-caking during storage and improvement in dosing properties of molding compounds.
- Auxillary during production of polychloroprene based adhesives.
- With thermoplastic rubber for reduction in abrasion and increase in dimensional heat stability.
- Reinforcement of Natural, SBR, Silicone, EVA, Nitrile, EPDM & other rubbers.
OTHER PRODUCTS
- Liquid Systems : Due to high surface area they function as clarifying and adsorption agents (e.g.beverages).
- Adhesives : To adjust rheology and provide reinforcement.
- Greases / Lubricants : For rheology control.
- Paint, Dyes & Printing inks :As a flatting / matting agent to reduce gloss or as a filler.
- Paper Industry : Provides lightness, whiteness & improves mechanical properties.
- Toothpaste & Polishes : As a mild abrasive and for rheology control.
- Pharmaceuticals :As a processing aid in tabletting & pelletizing.
- Cosmetics : For rheology control.
UNISIL PRECIPITATED SILICA
UNISIL precipitated Silicas are available in various combinations of physical properties such primary and secondary particle size, surface area, bulk density, absorption capacity etc. It is available in three physical form Categories:-
- Powder Products
- Spray Dried Granules
- Compacted Pellets
Physiochemical Properties of Precipitated Silica (Powder Products)
| PROPERTY | UNIT | UNISIL NK-70 | UNISIL NK-1 | UNISIL NK-2 | UNISIL NK-3 | UNISIL NK-19 | UNISIL NK-4 | UNISIL NK-7 | | Appearance | ------- | Snow White free flowing powder | | Behaviour towards Water | ------- | Hydrophilic | | Moisture (105oC) | % | 5 ± 1.5 | 5 ± 1.5 | 5 ± 1.5 | 5 ± 1.5 | 5 ± 1.5 | 5 ± 1.5 | 5 ± 1.5 | | Ignition loss (900oC for 2 hrs) | %max | 6 | 6 | 6 | 6 | 6 | 6 | 6 | | Surface Area (BET) | m2/gm | 100-115 | 130-150 | 140-170 | 160-200 | 240-260 | 115-125 | 290-320 | | Average Particle size | Primary | nm | 10-12 | 18-20 | 16-18 | 12-14 | 8-10 | 10-12 | 6-8 | | Secondary | µ m | 14-16 | 8-10 | 10-12 | 10-12 | 12-14 | 8-10 | 8-10 | | Water Absorption | % | 230-260 | 240-260 | 240-260 | 240-260 | 300-350 | 260-280 | 400-450 | | Oil absorption | % | 225-255 | 235-255 | 235-255 | 235-255 | 295-345 | 255-275 | 395-495 | | pH (5% acq. Solution) | ---- | 6.2-7.0 | 6.2-7.2 | 6.2-7.5 | 6.2-7.0 | 6.2-7.0 | 6.5-7.0 | 6.2-7.2 | | Residue on 300 mesh | % max | 1.0 | 0.5 | 1.0 | 2.0 | 1.0 | 0.5 | 0.5 | | Specific Gravity | ------- | 2 ± 0.2 | 2 ± 0.2 | 2 ± 0.2 | 2 ± 0.2 | 2 ± 0.2 | 2 ± 0.2 | 2 ± 0.2 | | Refractive Index | -------- | 1.46 | 1.46 | 1.46 | 1.46 | 1.46 | 1.46 | 1.46 | | Al2O3 | %(max) | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | | R2O3 | %(max) | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | | Fe as Fe2O3 | %(max) | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | | Storage Stability | PRACTICALLY UNLIMITED UNDER FAVOURABLE TRANSPORT/STORAGE CONDITIONS | | Packing | Kgs/bag | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Physiochemical Properties of Precipitated Silica (Powder Products)
| PROPERTY | UNIT | UNISIL NK-3 HS | | Appearance | ------ | Snow White free flowing Powder | | Behaviour towards water | ------ | Hydrophilic | | Moisture (105oC) | % | 5 ± 1.5 | | Ignition loss (900oC for 2 hrs) | % max | 6 | | Surface Area (BET) | m2/gm | 150 ± 10 | | Average Particle size (d50) | nm | 3-5 | | Water Absorption | % | 240-270 | | Oil absorption | % | 235-265 | | Bulk Density | gm/cc | 0.06-0.08 | | pH (5% acq. Solution) | ------- | 6.8 ± 0.5 | | Residue on 300 mesh | % max | 0.1 | | Specific Gravity | ------- | 2 ± 0.02 | | Refractive Index | ------- | 1.46 | | SiO2 | % | 98-99 | | Al2O3 | % max | 0.2 | | R2O3 | % max | 0.3 | | Fe as Fe2O3 | % max | 0.03 | | Storage Stability | PRACTICALLY UNLIMITED UNDER FAVOURABLE TRANSPORT/STORAGE CONDITIONS | | Packing | Kgs/bag | 25 |
Physiochemical Properties of Precipitated Silica (Spray Dried Granules)
| PROPERTY | UNIT | UNISIL NK-3 (Spray Dried) | | Appearance | ------- | Snow White free flowing powder | | Behaviour towards Water | ------- | Hydrophilic | | Moisture (105oC) | % | 5 ± 1.5 | | Ignition loss (900oC for 2 hrs) | % max | 170 ± 15 | | Surface Area (BET) | m2/gm | 290-320 | | Average Particle size | Primary | nm | 15 | | Secondary | µ m | 5 | | Water Absorption | % | 240-260 | | Oil absorption | % | 235-255 | | pH (5% acq. Solution) | ---- | 6.2-7.0 | | Specific Gravity | ------- | 2 ± 0.2 | | Refractive Index | -------- | 1.46 | | Al2O3 | % | 0.2 | | R2O3 | % | 0.2 | | Fe as Fe2O3 | %(max) | 0.3 | | Arsenic (As) | ppm max | 5 | | Lead (Pb) | ppm max | 5 | | Storage Stability | PRACTICALLY UNLIMITED UNDER FAVOURABLE TRANSPORT/STORAGE CONDITIONS | | Packing | Kgs/bag | 25 |
Physiochemical Properties of Precipitated Silica (Pelletized Products)
| PROPERTY | UNIT | UNISIL NK-3 (Spray Dried) | | Appearance | ------- | Snow White free flowing powder | | Behaviour towards Water | ------- | Hydrophilic | | Moisture (105oC) | % | 5 ± 1.5 | | Ignition loss (900oC for 2 hrs) | % max | 170 ± 15 | | Surface Area (BET) | m2/gm | 290-320 | | Average Particle size | Primary | nm | 15 | | Secondary | µ m | 5 | | Water Absorption | % | 240-260 | | Oil absorption | % | 235-255 | | pH (5% acq. Solution) | ---- | 6.2-7.0 | | Specific Gravity | ------- | 2 ± 0.2 | | Refractive Index | -------- | 1.46 | | SiO2 | % | 98-99 | | Al2O3 | % | 0.2 | | R2O3 | % | 0.2 | | Fe as Fe2O3 | %(max) | 0.03 | | Arsenic (As) | ppm max | 5 | | Lead (Pb) | ppm max | 5 | | Storage Stability | PRACTICALLY UNLIMITED UNDER FAVOURABLE TRANSPORT/STORAGE CONDITIONS | | Packing | Kgs/bag | 25 |
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