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Afexco Exporters Pty
location Upington, South Africa

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Our Products

  1. Catalysts And Absorbents 6 Products available
  2. Industrial Chemicals 5 Products available
  3. Inorganic And Organic Solvents 2 Products available
  4. Adhesives & Sealants 2 Products available
  5. Ores And Minerals 1 Products available
  6. Gastrointestinal Drug 1 Products available
  7. Dietary Supplements & Nutraceuticals 1 Products available
  8. Medicines Tonics And Drugs 1 Products available
  9. Food Emulsifiers 1 Products available
  10. Pharmaceutical Excipients 1 Products available
  11. Analgesics 1 Products available
  12. Food Grade Chemicals 1 Products available
  13. Others Products 6 Products available

Catalysts And Absorbents

Our Complete range of products are Sodium Borate, Boric Acid, Tartaric Acid, Glacial Acetic Acid and Selenious Acid.

Sodium Borate

Sodium Borate
  • Min. Order (MOQ) 20 Metric Ton
Borax bp; sodium borate; sodium tetraboratemf na2b4o7, 10h2o --m.wt 381.4 -- cas# 1303-96-4 charactersa white, crystalline powder, colourless crystals or crystalline masses, efflorescent, soluble in water, very soluble in boiling water, freely soluble in glycerol. Identificationa. To 1 ml of solution s (see tests) add 0.1 ml of sulphuric acid and 5 ml of methanol and ignite. The flame has a green border.B. To 5 ml of solution s add 0.1 ml of phenolphthalein solution. The solution is red. On the addition of 5 ml of glycerol (85 per cent) the colour disappears.C. Solution s gives the reactions of sodium. Testssolution sdissolve 4.0 g in carbon dioxide-free water prepared from distilled water and dilute to 100 ml with the same solvent.Appearance of solutionsolution s is clear and colourless.Phthe ph of solution s is 9.0 to 9.6.Sulphates15 ml of solution s complies with the limit test for sulphates (50 ppm).Ammonium6 ml of solution s diluted to 14 ml with water complies with the limit test for ammonium (10 ppm).Arsenic5 ml of solution s complies with limit test a for arsenic (5 ppm).Calcium15 ml of solution s complies with the limit test for calcium (100 ppm).Heavy metals12 ml of solution s complies with limit test a for heavy metals (25 ppm). Sodium borate usp nf sodium borate usp-nf; borax usp nfna2b4o7-10h2o 381.37boraxborax [1303-96-4]anhydrous 201.22 [1330-43-4] sodium borate contains an amount of na2b4o7 equivalent to not less than 99.0 percent and not more than 105.0 percent of na2b4o710h2o. Identification a solution (1 in 20) responds to the tests for sodium and for borate.Carbonate and bicarbonate to 5 ml of a solution (1 in 20), contained in a test tube, add 1 ml of 3 n hydrochloric acid: no effervescence is observed.Heavy metals the limit is 0.002%. Sodium borate de
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Boric Acid

Boric Acid
  • Min. Order (MOQ) 20 Metric Ton
Boric acid bpmf h3bo3 -- m.wt 61.8 -- cas# 10043-35-3 definitionboric acid contains not less than 99.0 per cent and not more than the equivalent of 100.5 percent of h3bo3. Charactersa white, crystalline powder, colourless, shiny plates greasy to the touch, or white crystals, soluble in water and in alcohol, freely soluble in boiling water and in glycerol (85 per cent). Identificationa. Dissolve 0.1 g by gently heating in 5 ml of methanol, add 0.1 ml of sulphuric acid and ignite the solution. The flame has a green border.B. Solution s (see tests) is acid. Testssolution sdissolve 3.3 g in 80 ml of boiling distilled water, cool and dilute to 100 ml with carbon dioxide-free water prepared from distilled water.Appearance of solutionsolution s is clear and colourless.Phthe ph of solution s is 3.8 to 4.8.Solubility in alcoholdissolve 1.0 g in 10 ml of boiling alcohol. The solution is not more opalescent than reference suspension and is colourless.Organic matterit does not darken on progressive heating to dull redness.Sulphates10 ml of solution s diluted to 15 ml with distilled water complies with the limit test for sulphates (450 ppm).Heavy metals12 ml of solution s complies with limit test a for heavy metals (15 ppm). Boric acid usp nfh3bo3 -- 61.83 boric acid contains not less than 99.5 percent and not more than 100.5 percent of h3bo3, calculated on the dried basis. Solubility in alcohol one g dissolves completely in 10 ml of boiling alcohol.Completeness of solution one g dissolves in 25 ml of water, producing a clear solution.Identification it responds to the tests for borate.Loss on drying dry it over silica gel for 5 hours: it loses not more than 0.5% of its weight.Heavy metals dissolve 1 g in 23 ml of water, and add 2 ml of 1 n acetic acid: the limit is 0.002%.
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Magnesium Sulfate

Magnesium Sulfate
Cas number anhydrous 7487-88-9, monohydrate 14168-73-1, dried 15244-36-7, heptahydrate 10034-99-8, specifications magnesium sulfate heptahydrateappearance ------------------- fine, white, sparkling crystal, free flowingmolecular formula ------------ mgso4.7h2o magnesium sulphate or magnesium sulfatemolecular wt ----------------- 246.47 gmolbulk density ----------------- 0.92-0.95 kglitsolubility ------------------- readily soluble in waterpurity as (mgso4.7h2o )------- 99% minimummagnesium oxide as (mgo) ----- 16.20% minimummagnesium as (mg) ------------ 9.70% minimumsulphur as (so4) ------------- 38.60% minimumsulphur as (s) --------------- 12.70% minimummagnesium sulphate as (mgso4)- 48.50% minimum magnesium sulphate or magnesium sulfateph of 5% aqueous solution----- 7 + - 0.5chlorides as (cl) % by mass -- 0.012 % maximumheavy metals as (pb) --------- not detectablearsenic as (as2o3) ----------- less then 1.00 ppm maximumiron as (fe) ----------------- 10 ppm maximummanganese as (mn) ------------ 15 ppm maximum magnesium sulfate anhydrous, dried and monohydrate is offered in similar specifications.
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Tartaric Acid

Tartaric Acid
Synonyms: butanedioic acid, 2, 3-dihydroxy-cas number: 87-69-4, molecular weight: 150.1, chemical formula: c4h6o6, einecs ec number: 201-766-0, fema: 3044, tartaric acid bp gradec4h6o6 --- 150.1--- 87-69-4ph eur definition(2r, 3r)-2, 3-dihydroxybutanedioic acid.Content: 99.5 per cent to 101.0 per cent (dried substance). Charactersappearance: white or almost white, crystalline powder or colourless crystals.Solubility: very soluble in water, freely soluble in ethanol (96 per cent). Identificationa. Solution s (see tests) is strongly acid.B. It gives the reactions of tartrates. Testssolution s: dissolve 5.0 g in distilled water and dilute to 50 ml with the same solvent.Appearance of solution: solution s is clear and not more intensely coloured than reference solution.Specific optical rotation: + 12.0 to + 12.8 (dried substance)oxalic acid: maximum 350 ppm, calculated as anhydrous oxalic acid.Chlorides: maximum 100 ppm.Sulphates: maximum 150 ppm.Calcium: maximum 200 ppm.Heavy metals: maximum 10 ppm.Loss on drying: maximum 0.2 per cent, determined on 1.000 g by drying in an oven at 105 csulphated ash: maximum 0.1 per cent, determined on 1.0 g. Assaydissolve 0.650 g in 25 ml of water. Titrate with 1 m sodium hydroxide using 0.5 ml ofphenolphthalein solution as indicator, until a pink colour is obtained.1 ml of 1 m sodium hydroxide is equivalent to 75.05 mg of c4h6o6. Tartaric acid usp nf gradec4h6o6 150.09butanedioic acid, 2, 3-dihydroxy-; butanedioic acid, 2, 3-dihydroxy-, [r-(r*, r*)]-.Tartaric acid; l -(+)-tartaric acid [526-83-0] and [87-69-4].Tartaric acid, dried over phosphorus pentoxide for 3 hours, contains not less than 99.7 percent and not more than 100.5 percent of c4h6o6.
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Glacial Acetic Acid

Glacial Acetic Acid
Cas number: 64-19-7, molecular weight: 60.05, chemical formula: ch3co2h , einecs ec number: 200-580-7, fema: 2006, glacial acetic acid bp gradeph eur -- c2h4o2 -- 60.1 -- 64-19-7 definitioncontent: 99.0 per cent mm to 100.5 per cent mm. Charactersappearance: crystalline mass or clear, colourless, volatile liquid.Solubility: miscible with water, with ethanol (96 per cent) and with methylene chloride.Identificationa. A 100 gl solution is strongly acid (2.2.4).B. To 0.03 ml add 3 ml of water r and neutralise with dilute sodium hydroxide solution r. The solution gives reaction (b) of acetates (2.3.1).Testssolution s: dilute 20 ml to 100 ml with distilled water.Appearance: the substance to be examined is clear and colourless.Freezing point: minimum 14.8c.Reducing substances: to 5.0 ml add 10.0 ml of water and mix. To 5.0 ml of this solution add 6 ml of sulfuric acid, cool and add 2.0 ml of 0.0167 m potassium dichromate. Allow to stand for 1 min and add 25 ml of water and 1 ml of a freshly prepared 100 gl solution of potassium iodide. Titrate with 0.1 m sodium thiosulfate, using 1.0 ml of starch solution as indicator. Not less than 1.0 ml of 0.1 m sodium thiosulfate solution is required.Chlorides: maximum 25 mgl.Sulfates: maximum 50 mgl, determined on solution s.Iron: maximum 5 ppm.Heavy metals: maximum 5 ppm.Residue on evaporation: maximum 0.01 per cent.Evaporate 20 g to dryness on a water-bath and dry at 100-105 c. The residue weighs a maximum of 2.0 mg.Assay: weigh accurately a conical flask with a ground-glass stopper containing 25 ml of water r. Add 1.0 ml of the substance to be examined and weigh again accurately. add 0.5 ml of phenolphthalein solution r and titrate with 1 m sodium hydroxide. 1 ml of 1 m sodium hydroxide is equivalent to 60.1 mg of c2h4o2.
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  • Afexco Exporters Pty, established in 2002, is the pioneer distributors of Specialty chemicals, Pharmaceutical Excipients, Fragrance & Flavor chemicals, Upington, South Africa
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