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D4773-02 – Standard Test Method Technical Guide
Test Method ASTM D4773-02 (Reapproved 2012) specifies a capillary gas chromatography procedure for determining the purity of Propylene Glycol Monomethyl Ether (PM), Dipropylene Glycol Monomethyl Ether (DPM), and Propylene Glycol Monomethyl Ether Acetate (PMA). It utilizes flame ionization detection (FID) and internal standardization for quantification.
📐 Scope, Analytics, and Isomeric Compositions
This test method covers the determination of the primary solvent and specified residual impurities within defined bounds. The standard explicitly acknowledges the complex isomeric nature of these commercial solvents.
- PM: Two isomers (1-methoxy-2-propanol, 2-methoxy-1-propanol).
- DPM: Four isomers (major: 1-(2-methoxy-1-methylethoxy)-2-propanol).
- PMA: Two isomers (1-methoxy-2-acetoxypropane, 2-methoxy-1-acetoxypropane).
💡 Technical Note: Chromatographic methods must resolve these isomeric peaks for accurate purity quantification per Note 1.
📊 Concentration Ranges and Impurity Limits
The method’s applicability is strictly defined by specific concentration windows.
| 🟦 Analyte | 📏 Main Component Range | 🎯 Key Impurity Limits |
|---|---|---|
| Propylene Glycol Monomethyl Ether (PM) | 98.0 % – 100 % | DPM: 0.08 % – 0.6 % |
| Dipropylene Glycol Monomethyl Ether (DPM) | 98.0 % – 100 % | PM: 0.05 % – 0.3 % TPM: 0 📥 Standard Documents Download |