Industrial chemicals · Taylor, TXCertificate of Analysis
Sample Certificate of Analysis
Glycerin USP Grade
USP Grade
Sample COA. Contact Alliance Chemical with your lot number to request a lot-specific COA.
- CAS number
- 56-81-5
- Structure
Structure · PubChem - Grade
- USP Grade
- Assay specification
- 99.0 - 101.0 percent
- Answer summary
Sample specification reference for Glycerin USP Grade. Source-record results are reference values, not measurements for your lot.
Last reviewed 2026-06-17 by Andre Taki, Chief Commercial Officer, DOT Hazmat–certified (49 CFR 172.704).
Specifications
| Parameter | Specification | Source reference result | Test Method |
|---|---|---|---|
| Assay (C3H8O3, anhydrous basis) | 99.0 - 101.0 percent | 100.0 percent | USP periodate oxidation / sodium hydroxide titration (monograph Assay) |
| Chloride | NMT 0.001% | 0.00014 % | — |
| Chlorinated Compounds | NMT 0.003% of Cl | 0.00023 % | Morpholine reflux followed by silver-nitrate turbidity comparison |
| Color (APHA) | 10 Max APHA | 6 | AMT-FGQ-G10 |
| Diethylene Glycol | NMT 0.1% | 0.0044 % | Gas chromatography with flame-ionization detection |
| Ethylene glycol | 0.10 Max % | 0.0059 % | USP 41 (Identification Test B, gas chromatography) |
| Fatty Acids and Esters | NMT 1 mL of 0.5 N sodium hydroxide | 0.2 | Titration of a 50 g sample with 0.5 N sodium hydroxide and 0.5 N hydrochloric acid |
| Heavy Metals | NMT 5 micro-gm per g | 1.0 | Heavy metals (as Pb), sulfide colour comparison against lead standard |
| Individual Impurities, excluding Diethylene Glycol | NMT 0.1% | 0.022 % | Gas chromatography with flame-ionization detection |
| pH | 5.5-8.0 | 6.8 | — |
| Refractive index | 1.470-1.475 | 1.4725 | — |
| Related compounds (any individual impurity other than diethylene glycol) | not more than 0.1% | 0.022 % | USP gas chromatography, area normalization |
| Related compounds (total impurities, including diethylene glycol) | not more than 1.0% | 0.057 % | USP gas chromatography, area normalization |
| Residue on Ignition | NMT 0.01% | 0.0016 % | Ignition of a 50 g sample followed by sulfuric-acid treatment and ignition to constant weight |
| Specific gravity, 25/25 °C | 1.2612 Min | 1.2618 | USP <841> |
| Sulfate | 0.002 % max | 0.00019 % | USP <221> |
| Total Impurities, including Diethylene Glycol | NMT 1.0% | 0.057 % | Gas chromatography with flame-ionization detection |
| Water | NMT 5.0% | 0.20 % | — |
| related compounds | 0.1 % max | 0.07 % | — |
Specification limits and source-record results are reproduced from the current product reference used by the TDS. This sample is not an issued certificate and does not identify a tested lot. Contact Alliance Chemical with the product and lot number for lot-specific documentation.
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