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D4836-09 – Standard Test Method Technical Guide
ASTM D4836-09 (Reapproved 2023) is the standard specification for dipropylene glycol monomethyl ether (DPM), a solvent used in paint and related coatings. It covers the chemical and physical properties of DPM, which is a mixture of isomers predominantly 1-(2-methoxy-1-methylethoxy)-2-propanol. The standard was originally approved in 1988 and last revised in 2017, with reapproval in 2023.
🧪 Chemical Specifications and Properties
DPM must meet the following property requirements, with all values in SI units. For conformance, observed or calculated values are rounded to the nearest unit in the last right-hand digit of the specification limit per Practice E29.
| 🟦 Property | 📏 Requirement |
|---|---|
| Assay, weight % (min) | 98.0 |
| Initial boiling point (°C, min) | 184 |
| Dry point (°C, max) | 195 |
| Apparent specific gravity 20/20°C | 0.953 to 0.956 |
| Apparent specific gravity 25/25°C | 0.949 to 0.952 |
| Color, Pt-Co scale (max) | 15 |
| Water, weight % (max) | 0.15 |
| Acidity as acetic acid, weight % (max) | 0.01 |
💡 Tip: The acidity limit of 0.01% by weight is equivalent to 0.1 mg of KOH per 1 g of specimen.
📊 Test Methods and Compliance
Designated ASTM methods ensure consistent testing. Assay is performed using Test Method D4773 (withdrawn 2021 but referenced), distillation range by D1078, specific gravity by D891 or digital method D4052, color by D1209 or tristimulus colorimetry D5386, water by D1364 (Karl Fischer), and acidity by D1613. Sampling follows Practice E300, and results are rounded per Practice E29.
| 📐 Test | ⚡ Method |
|---|---|
| Purity (Assay) | D4773 |
| Distillation Range | D1078 |
| Specific Gravity | D891 or D4052 |
| Color (Pt-Co) | D1209 or D5386 |
| Water Content | D1364 |
| Acidity | D1613 |
⚠️ Note: Instrumental Pt-Co color by Test Method D5386 has no statistically significant difference from visual determination, per the standard.
⚡ Handling and Safety Considerations
Users should consult the supplier’s Safety Data Sheet for hazard information. The standard specifies that SI units are standard and requires rounding for conformance. DPM is used in volatile solvents and chemical intermediates, requiring proper sampling and handling as per Guide D268 and Practice E300.
❓ Frequently Asked Questions
🔍 What is the minimum assay for DPM expressed as weight percent? The minimum assay is 98.0% by weight.
💡 How are test results rounded to determine conformance? Test values are rounded to the nearest unit in the last right-hand digit of the specification limit, using the rounding method of Practice E29.
⚡ What are the distillation temperature limits for DPM? The initial boiling point is minimum 184°C and the dry point is maximum 195°C.
📌 Which test method is specified for water content in DPM? Water content is determined by Test Method D1364, using Karl Fischer reagent titration.