Colloidal Silicon Dioxide and Fumed Silica and Precipitated Silica USP NF BP Ph Eur EP IP JP Analytical Reagent FCC Food Grade Manufacturers Exporters

Aadhunik Industries is a manufacturing group company. Aadhunik Industries is pioneer manufacturer and exporter of Colloidal Silicon Dioxide and Fumed Silica and Precipitated Silica USP NF BP Ph Eur EP IP JP Analytical Reagent FCC Food Grade, Specialty Chemicals, Pharmaceutical Excipients, Food Fragrance & Flavor chemicals in India. It has toll manufacturers and representatives in UAE, Europe, Canada & USA and agents & customers in all countries like USA, Canada, Europe, UAE, South Africa, Tanzania, Kenya, Egypt, Nigeria, Uganda, Turkey, Mexico, Brazil, Chile, Argentina, Dubai, Netherlands, Italy, Spain, Germany, Portugal, France, Malaysia, Indonesia, Thailand, Korea, Japan, Russia etc.

Aadhunik Industries and/or associated units are FDA-GMP certified, Halal and/or Kosher certified, REACH registered, ISO-9001, ISO-22000 HACCP certified. We offer crystals granules in precise micron or mesh size as per buyers needs. We offer very high purity standards as per specifications required.

Specifications of Hydrophobic Colloidal Anhydrous Silica BP Ph Eur Grade Show/Hide Details

Specifications of Hydrophobic Colloidal Anhydrous Silica BP Ph Eur Grade:

DEFINITION
Colloidal silicon dioxide partly alkylated for hydrophobation.
Content: 99.0 per cent to 101.0 per cent SiO2 (ignited substance).

CHARACTERS
Appearance: White or almost white, light, fine, amorphous powder, not wet-able by water.
Solubility: Practically insoluble in water and mineral acids except hydrofluoric acid. It dissolves slowly in hot solutions of alkali hydroxides.

IDENTIFICATION
A. About 25 mg ignited in a platinum crucible at 900 ± 50C for h gives the reaction of silicates.
B. Water-dispersible fraction (see Tests).

TESTS
Chlorides: Maximum 250 ppm.
To 1.0 g add 30 mL of methanol and 20 mL of dilute nitric acid. Heat on a water bath for 15 min stirring frequently. Cool, dilute to 50 mL with water and filter. Dilute 10 mL of the filtrate to 15 mL with water.
Water-dispersible fraction: Maximum 3.0 per cent.
Place 0.400 g in a 500 mL separating funnel, add 100 mL of water and shake for 1 min. Allow to stand for 1 h. Allow 90 mL of the aqueous phase to run out dropwise without filtration into a suitable dish dried at 140C and cooled in a desiccator. Evaporate to dryness at 140C, starting at a low temperature to avoid splashing. Cool in a desiccator. The residue weighs a maximum of 12 mg.
Loss on ignition: Maximum 6.0 per cent, determined on 0.200 g by ignition in a platinum crucible at 900 ± 50C for 2 h. It is advisable to place the crucible in a cold oven and then to heat up the oven. Allow to cool in a desiccator before weighing.

Specifications of Colloidal Anhydrous Silica BP Ph Eur Grade Show/Hide Details

Specifications of Colloidal Anhydrous Silica BP Ph Eur Grade:
SiO2 --- 60.1 --- CAS 7631-86-9
Action and use: Excipient.

DEFINITION
Content: 99.0 per cent to 100.5 per cent of SiO2 (ignited substance).

CHARACTERS
Appearance: White or almost white, light, fine, amorphous powder, with a particle size of about 15 nm.
Solubility: Practically insoluble in water and in mineral acids except hydrofluoric acid. It dissolves in hot solutions of alkali hydroxides.

IDENTIFICATION
About 20 mg gives the reaction of silicates.

TESTS
pH: 3.5 to 5.5.
Chlorides: Maximum 250 ppm.
To 1.0 g add a mixture of 20 mL of dilute nitric acid and 30 mL of water and heat on a water-bath for 15 min, shaking frequently. Dilute to 50 mL with water, if necessary, filter and cool. Dilute 10 mL of the filtrate to 15 mL with water.
Loss on ignition: Maximum 5.0 per cent, determined on 0.200 g by ignition in a platinum crucible at 900 ± 50C for 2 h. Allow to cool in a desiccator before weighing.
Fumed Silica, also known as pyrogenic silica is a very fine particulate or colloidal form of silicon dioxide. It is prepared by burning SiCl4 in an oxygen-rich hydrogen flame to produce a "smoke" of SiO2.

Specifications of Colloidal Silicon Dioxide USP NF Grade:
SiO2 --- 60.08
Fumed Silica.
Silica CAS 7631-86-9

Colloidal Silicon Dioxide is a submicroscopic fumed silica prepared by the vapor-phase hydrolysis of a silicon compound. When ignited at 1000 for 2 hours, it contains not less than 99.0 percent and not more than 100.5 percent of SiO2.

Identification:
A: Transfer about 5 mg to a platinum crucible and mix with about 200 mg of anhydrous potassium carbonate. Ignite at a red heat over a burner for about 10 minutes, and cool. Dissolve the melt in 2 mL of freshly distilled water, warming if necessary, and slowly add 2 mL of ammonium molybdate to the solution: a deep yellow color is produced.
B: [Caution: Avoid contact with o-tolidine when performing this test, and conduct the test in a wellventilated hood.] Place 1 drop of the yellow silicomolybdate solution obtained in Identification test A on a filter paper and evaporate the solvent. Add 1 drop of a saturated solution of o-tolidine in glacial acetic acid to reduce the silicomolybdate to molybdenum blue, and place the paper over ammonium hydroxide: a greenish blue spot is produced.

pH: between 3.5 and 5.5, in a 1 in 25 dispersion.
Loss on drying: Dry it in a tared platinum crucible at 105 for 2 hours: it loses not more than 2.5% of its weight. Retain the dried specimen, in the crucible, for the test for Loss on ignition.
Loss on ignition: Ignite the portion of Colloidal Silicon Dioxide, retained from the test for Loss on drying, at 1000C ± 25C to constant weight: the previously dried Colloidal Silicon Dioxide loses not more than 2.0% of its weight.
Arsenic: To pass the test. The limit is 8 microg per g.

Specifications of Silicon Dioxide USP NF Grade:
Precipitated Silica
SiO2xH2O
Anhydrous 60.08

Silicon Dioxide is obtained by insolubilizing the dissolved silica in sodium silicate solution. Where obtained by the addition of sodium silicate to a mineral acid, the product is termed silica gel; where obtained by the destabilization of a solution of sodium silicate in such manner as to yield very fine particles, the product is termed precipitated silica. After ignition at 1000C for not less than 1 hour, it contains not less than 99.0 percent of SiO2.

Packaging and storage: Preserve in tight containers, protected from moisture.
Labeling: Label it to state whether it is silica gel or precipitated silica.
Identification: Transfer about 5 mg to a platinum crucible, mix with about 200 mg of anhydrous potassium carbonate, ignite at a red heat over a burner for 10 minutes and cool. Dissolve the melt in 2 mL of recently distilled water, warming if necessary, and slowly add 2 mL of ammonium molybdate: a deep yellow color is produced.
pH: between 4 and 8, in a slurry (1 in 20).
Loss on drying: Dry it at 145 for 4 hours: it loses not more than 5.0% of its weight.
Loss on ignition: Ignite about 1 g of it, previously dried and accurately weighed, at 1000C for not less than 1 hour: it loses not more than 8.5% of its weight.
Chloride: Boil 5 g in 50 mL of water under a reflux condenser for 2 hours, cool, and filter. A 7-mL portion of the filtrate shows no more chloride than corresponds to 1.0 mL of 0.020 N hydrochloric acid (0.1%).
Sulfate: A 10-mL portion of the filtrate obtained in the test for Chloride shows no more sulfate than corresponds to 5.0 mL of 0.020 N sulfuric acid (0.5%).
Arsenic: To pass the test. --- The limit is 3 ppm.
Heavy metals: To pass the test. --- The limit is 0.003%.

Specifications of Silicon Dioxide FCC Food Grade:
Synthetic Amorphous Silica
SiO2 Formula weight 60.08
INS: 551 CAS 7631-86-9

DESCRIPTION
Silicon Dioxide occurs as an amorphous substance that shows a noncrystalline pattern when examined by X-ray diffraction. It is produced synthetically, either by a vapor-phase hydrolysisprocess, yielding fumed silica, or by a wet process, yielding precipitated silica, silica gel, colloidal silica, or hydrous silica. Fumed silica is produced in an essentially anhydrous state, whereas the wet-process products are obtained as hydrates or contain surface-adsorbed water.
Fumed silica occurs as a white, fluffy, nongritty powder of extremely fine particle size and is hygroscopic. The wet process silicas occur as white, fluffy powders or as white, microcellular beads or granules and are hygroscopic or absorb moisture from the air in varying amounts. All these forms of Silicon Dioxide are insoluble in water and in organic solvents but they are soluble in hydrofluoric acid and in hot, concentrated solutions of alkalies.
Function: Anticaking agent; defoaming agent; carrier; conditioning agent; chillproofing agent in malt beverages; filter aid.

REQUIREMENTS
Identification:
A. Place about 5 mg of sample into a platinum crucible, mix with 200 mg of anhydrous potassium carbonate and ignite over a burner at a red heat for about 10 min. Cool, dissolve the melt in 2 mL of freshly distilled water, warming if necessary, and slowly add 2 mL of ammonium molybdate. A deep yellow color appears.
B. Place 1 drop of the solution from Identification Test A on a filter paper and evaporate the solvent. Add 1 drop of a saturated solution of o-toluidine in glacial acetic acid and place the paper over ammonium hydroxide. A green-blue spot develops.
Assay: Fumed Silica: Not less than 99.0% of SiO2 after ignition; Precipitated Silica, Silica Gel, and Hydrous Silica: Not less than 94.0% of SiO2 after ignition.
Lead: Not more than 5 mg/kg.
Loss on Drying: Fumed Silica: Not more than 2.5%; Precipitated Silica and Silica Gel: Not more than 7.0%; Hydrous Silica: Not more than 70.0%; Colloidal Silica: Not more than 85.0%.
Loss on Ignition: Fumed Silica: Not more than 2.0% after drying; Silica Gel, Hydrous Silica, and Precipitated Silica: Not more than 8.5% after drying.
Soluble Ionizable Salts (as Na2SO4): Precipitated Silica, Silica Gel, and Hydrous Silica: Not more than 5.0%.

Silica, Colloidal Anhydrous, Precipitated Silica is also available as per EP grade monograph.

CAS Number 112945-52-5 or 7631-86-9, Colloidal Silicon Dioxide and Fumed Silica and Precipitated Silica manufacturers suppliers exporters at:

manufacturer supplier exporter
Aadhunik Industries
Ankleshwar Gujarat & Mumbai, India
TEL: (OFFICE) 91-22-23774610, 23723564.