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Glycerin or Glycerol
CAS Number: 56-81-5

Molecular Formula: C3H8O3
Molecular Weight: 92.1

Glycerin or Glycerol Suppliers
Glycerin or Glycerol

Specifications of Glycerin USP Grade:
C3H8O3 --- 92.10
Glycerol --- CAS 56-81-5.

Glycerin contains not less than 99.0 percent and not more than 101.0 percent of C3H8O3, calculated on the anhydrous basis.

Color: Its color, when viewed downward against a white surface in a 50-mL color-comparison tube, is not darker than the color of a standard made by diluting 0.40 mL of ferric chloride CS with water to 50 mL and similarly viewed in a color-comparison tube of approximately the same diameter and color as that containing the Glycerin.
A: Infrared Absorption.
B: Prepare the Test solution and the Resolution solution as directed in the test for Limit of diethylene glycol and related compounds. Dilute a portion of each solution, stepwise if necessary, with water to obtain the Diluted test solution and the Diluted resolution solution having concentrations of about 0.1 mg per mL. Proceed as directed for Procedure in the test for Limit of diethylene glycol and related compounds: the retention time of the glycerin peak in the chromatogram of the Diluted test solution corresponds to that obtained in the chromatogram of the Diluted resolution solution.
Specific gravity: not less than 1.249.
Residue on ignition: Heat 50 g in an open, shallow 100-mL porcelain dish until it ignites, and allow it to burn without further application of heat in a place free from drafts. Cool, moisten the residue with 0.5 mL of sulfuric acid, and ignite to constant weight: the weight of the residue does not exceed 5 mg (0.01%).
Water: not more than 5.0%.
Chloride: A 7.0-g portion shows no more chloride than corresponds to 0.10 mL of 0.020 N hydrochloric acid (0.001%).
Sulfate: A 10-g portion shows no more sulfate than corresponds to 0.20 mL of 0.020 N sulfuric acid (about 0.002%).
Heavy metals: Mix 4.0 g with 2 mL of 0.1 N hydrochloric acid, and dilute with water to 25 mL: the limit is 5 micro-gm per g.
Limit of chlorinated compounds: Accurately weigh 5 g of Glycerin into a dry, round-bottom, 100-mL flask, add 15 mL of morpholine, and connect the flask by a ground joint to a reflux condenser. Reflux gently for 3 hours. Rinse the condenser with 10 mL of water, receiving the washing in the flask, and cautiously acidify with nitric acid. Transfer the solution to a suitable comparison tube, add 0.50 mL of silver nitrate, dilute with water to 50.0 mL, and mix: the turbidity is not greater than that of a blank to which 0.20 mL of 0.020 N hydrochloric acid has been added, the refluxing being omitted (0.003% of Cl).
Fatty acids and esters: Mix 50 g of Glycerin with 50 mL of freshly boiled water and 5 mL of 0.5 N sodium hydroxide, boil the mixture for 5 minutes, cool, add PhPh, and titrate the excess alkali with 0.5 N hydrochloric acid VS. Perform a blank determination: not more than 1 mL of 0.5 N sodium hydroxide is consumed.
Limit of diethylene glycol and related compounds:
Resolution solution: Dissolve accurately weighed quantities of diethylene glycol and USP Glycerin in water, and dilute quantitatively, and stepwise if necessary, with water to obtain a solution having a known concentration of about 0.5 mg of each per mL.
Standard solution: Dissolve an accurately weighed quantity of diethylene glycol in water, and dilute quantitatively, and stepwise if necessary, with water to obtain a solution having a known concentration of about 0.05 mg per mL.
Test solution: Transfer 5 g of Glycerin, accurately weighed, to a 100-mL volumetric flask, dissolve in and dilute with water to volume, and mix.
Chromatographic system: The gas chromatograph is equipped with a flame-ionization detector, a 0.53-mm × 30-m fused-silica analytical column coated with 3.0- micro-m G43 stationary phase, and an inlet liner having an inverted cup or spiral structure. The chromatograph is programmed as follows. Initially, the column temperature is equilibrated at 100 until the time of injection, is increased at a rate of 7.5C per minute to 220C and is maintained at 220C for 4 minutes. The injection port temperature is maintained at 220C, and the detector temperature is maintained at 250C. The carrier gas is helium. The split flow ratio is about 10:1, and the linear flow is maintained at about 38 cm per second. Chromatograph the Resolution solution and record the peak responses as directed for Procedure: the resolution, R, between diethylene glycol and glycerin is not less than 7.0. Chromatograph the Standard solution and record the peak responses as directed for Procedure: the relative standard deviation for replicate injections is not more than 15%.
Procedure: Separately inject equal volumes (about 0.5 microL) of the Standard solution and the Test solution into the chromatograph, record the chromatograms, and measure the responses for all the peaks. Calculate the percentage of diethylene glycol in the portion of Glycerin taken by the formula:
in which CS is the concentration, in mg per mL, of diethylene glycol in the Standard solution; CU is the concentration, in mg per mL, of Glycerin in the Test solution; and rU and rS are the peak responses for diethylene glycol obtained from the Test solution and the Standard solution, respectively: not more than 0.1% is found. Calculate the percentage of each other impurity, excluding any solvent peaks, in the portion of Glycerin taken by the formula:
100(ri / rs)
in which ri is the peak response of each individual impurity obtained from the Test solution; and rs is the sum of the responses of all the peaks obtained from the Test solution: not more than 0.1% of any individual impurity, excluding diethylene glycol, is found; and not more than 1.0% of total impurities, including diethylene glycol, is found.

Specifications of Glycerol Analytical Reagent Grade:
CH2OHCHOHCH2OH --- Formula Weight 92.09
CAS Number 56-81-5

Assay (by volume): 99.5% C3H5(OH)3

Color (APHA) 10
Residue after ignition: 0.005%
Neutrality: Passes test
Chlorinated compounds (as Cl): 0.003%
Sulfate (SO4): 0.001%
Acrolein and glucose: Passes test
Fatty acid esters (as butyric acid): 0.05%
Substances darkened by sulfuric acid: Passes test
Heavy metals (as Pb): 2 ppm
Water (H2O): 0.5%.

Specifications of Glycerin FCC Food Grade:
C3H8O3 --- Formula weight 92.09
INS: 422 CAS: 56-81-5

Glycerin occurs as a clear, colorless, viscous liquid. It is hygroscopic, and its solutions are neutral. Glycerin is miscible with water and with alcohol. It is insoluble in chloroform, in ether, and in fixed and volatile oils.
Function: Humectant; solvent; bodying agent; plasticizer.

Identification: The infrared absorption spectrum of a thin film of sample exhibits a very strong, broad band at 2.7 micro-m to 3.3 micro-m; a strong doublet at about 3.4 micro-; a maximum at about 6.1 micro-; a strong region of absorption between 6.7 micro-m and 8.3 micro-m, having maxima at about 7.1 micro-m, 7.6 micro-m, and 8.2 micro-m, and a very strong region of bands at about 9.0 micro-m, 9.6 micro-m, 10.1 micro-m, 10.9 micro-m, and 11.8 micro-m.
Note: Glycerin having a low water content may not exhibit a maximum at about 6.1 micro-m.
Assay: Not less than 95.0% and not more than 100.5% of C3H8O3.
Chlorinated Compounds (as Cl): Not more than 0.003%.
Color: Passes test.
Fatty Acids and Esters: Passes test (limit about 0.1%, calculated as butyric acid).
Lead: Not more than 1 mg/kg.
Readily Carbonizable: Substances Passes test.
Residue on Ignition: Not more than 0.01%.
Specific Gravity: Not less than 1.249.

We also supply Glycerin or Glycerol BP Ph Eur Grade.

Please visit SDS Safety Data Sheet of Glycerin or Glycerol Suppliers.

American Molecules, also known as is a distributor, supplier and manufacturers' representative of all types of Pharmaceuticals, Functional Ingredients, Excipients and Specialty Chemicals in Texas USA. Our principals manufacture supply and export USP NF BP, Ph Eur, etc grades of chemicals pure and reagent grade, mineral fortifiers, FCC food grade. Tailor made particle size and customized specifications are offered. The principal's facility is having one or more of the certifications like FDA approval and GLP, cGMP, ISO9001, ISO14001, ISO/IEC 17025, ISO22000, FSSC 22000, ISO45001, FSSAI, Kosher, HALAL, COPP, WHO-GMP certified and Written Confirmation (WC) for export to Europe is available. The manufacturers suppliers and exporters observe WHO Good Manufacturing Practices and Good Laboratory Practices.

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Suppliers and Manufacturers' Representative:
American Molecules - USA
9910 Bent Oak Dr
Houston, TX 77040, USA
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