Industrial chemicals · Taylor, TXCertificate of Analysis
Sample Certificate of Analysis
Propylene Glycol USP Grade
USP Grade
Sample COA. Contact Alliance Chemical with your lot number to request a lot-specific COA.
- CAS number
- 57-55-6
- Structure
Structure · PubChem - Grade
- USP Grade
- Assay specification
- not less than 99.5 percent
- Answer summary
Sample specification reference for Propylene Glycol 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 (C3H8O2) | not less than 99.5 percent | 99.87 % | GC, thermal conductivity detector, 1-m x 4-mm column packed with 5% G16 on support S5, area normalization excluding air and water |
| Acidity | not more than 0.20 mL of 0.10 N sodium hydroxide is required | 0.06 | Titration of 10 mL with 0.10 N sodium hydroxide to phenolphthalein endpoint |
| Chloride | 0.007% | 0.000036 % | USP <221> |
| Color, Pt-Co | 10 APHA (maximum) | 5 | Platinum-cobalt (APHA) color scale |
| Heavy metals | 5 ppm | 0.64 ppm | Heavy metals (as Pb), sulfide colour comparison against lead standard |
| Identification A (Infrared Absorption) | Infrared Absorption 〈197F〉 on undried specimen | Passes test | USP <197F> |
| Iron | 0.50 weight ppm (maximum) | 0.060 ppm | — |
| Limit of Diethylene Glycol | NMT 0.10% | 0.0027% | GC, flame ionization detector, 0.53-mm x 30-m fused-silica G43 column, 2,2,2-trichloroethanol internal standard |
| Limit of Ethylene Glycol | NMT 0.10% | 0.00045% | GC, flame ionization detector, 0.53-mm x 30-m fused-silica G43 column, 2,2,2-trichloroethanol internal standard |
| Odor | Pass | Passes test | Sensory (odor) evaluation |
| Refractive index | 1.4310 - 1.4330 | 1.4319 | — |
| Residual solvents | Pass | Passes test | USP <467> |
| Residue on ignition | 0.0070 wt% max (3.5 mg from 50 g) | 0.00045 wt% | Ignition of 50 g, residue moistened with 0.5 mL sulfuric acid and ignited to constant weight |
| Specific gravity | between 1.035 and 1.037 | 1.036 | USP <841> |
| Sulfate | 0.006% | 0.00040 % | USP <221> |
| Suspended matter | Pass | Passes test | — |
| Water | not more than 0.2% | 0.044 % | USP <921> Method I (Karl Fischer) |
| Elemental impurities | Meets USP <232> / ICH Q3D oral limits | Passes test | USP <232> / <233>, ICP-MS |
| arsenic | 1 ppm max | 0.026 ppm | — |
| distillation dp | 189 deg C max | 188.0 °C | — |
| distillation ibp | 185 deg C min | 186.7 °C | — |
| dpg | 0.1 %m/m max | 0.036 %m/m | — |
| pb | 1 mg/kg max | 0.014 mg/kg | — |
| meg | 0.001 %m/m max | 0.00044 %m/m | — |
| oxidizing substances | 0.2 ml max | 0.03 | — |
| po | 0.001 %m/m max | 0.00030 %m/m | — |
| tpg | 0.03 %m/m max | 0.0056 %m/m | — |
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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