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D331-11 – Standard Test Method Technical Guide
📖 Scope, Designation, and Referenced Standards
ASTM D331-11 (Reapproved 2019) provides the standard specification for 2-ethoxyethanol, also known as ethylene glycol monoethyl ether. This standard is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and Subcommittee D01.35 on Solvents, Plasticizers, and Chemical Intermediates. Originally approved in 1932, the current edition was published in April 2019. The specification covers the chemical and physical property requirements necessary to classify the material for industrial use.
All values stated in SI units are regarded as the standard. The standard was developed in accordance with internationally recognized principles from the World Trade Organization Technical Barriers to Trade (TBT) Committee. For determining conformance, all observed or calculated values must be rounded off “to the nearest unit” in the last right-hand digit of the specification limit, in accordance with Practice E29.
⚠️ Safety Guidance: Section 1.4 of the standard directs users to consult the supplier’s Material Safety Data Sheets (MSDS) for complete hazard information and safe handling procedures before working with 2-ethoxyethanol.
⚙️ Conformance Properties for 2-Ethoxyethanol
To meet the requirements of ASTM D331, the material must comply with the strict property limits detailed in the following table. These specifications ensure the purity and performance of the solvent for its intended applications.
| 🟦 Property | 📏 Specification Requirement |
|---|---|
| Apparent Specific Gravity (20/20 °C) | 0.929 to 0.932 |
| Apparent Specific Gravity (25/25 °C) | 0.926 to 0.929 |
| Color, Pt-Co scale, max | 15 |
| Distillation — Initial Boiling Point, min (760 mm Hg) | 134.0 °C |
| Distillation — Dry Point, max (760 mm Hg) | 136.0 °C |
| Nonvolatile Matter, max | 5 mg/100 mL |
| Water Content, max | 0.1 weight % |
| Acidity (free acid as acetic acid), max | 0.01 weight % |
💡 Technical Note on Test Methods: Instrumental Pt-Co color analysis by Test Method D5386 has shown no statistically significant difference from the manual method D1209, though it is not confirmed if 2-ethoxyethanol was in the interlaboratory sample set. The specified water limit also guarantees the material is miscible without turbidity with 19 volumes of 99% heptane at 20 °C.
📊 Test Methods and Compliance Validation
Sampling and testing of 2-ethoxyethanol must follow the specific ASTM standards referenced in the specification. The following table outlines the required test methods for verifying each property of the material.
| 📐 Property | ⚡ Test Method |
|---|---|
| General Sampling and Testing | E300 and D268 |
| Specific Gravity | D4052 (Digital Density Meter) |
| Color | D1209 or D5386 |
| Distillation Range | D1078 |
| Nonvolatile Matter | D1353 |
| Water Content | D1364 (Karl Fischer Titration) |
| Acidity | D1613 |
| Packaging | PPP-C-2020 (Federal Specification) |
Adherence to these test methods is mandatory for demonstrating objective conformance to the D331 specification. Users must apply the rounding-off rules of Practice E29 when evaluating test data against the specified limits.
❓ Frequently Asked Questions
🔍 What is the official designation and status of this standard?
The standard is designated as ASTM D331-11 (Reapproved 2019). Originally approved in 1932, the “11” indicates the year of the last revision, and the “(2019)” indicates it was reaffirmed without technical changes in 2019.
📌 What is the maximum allowable water content for conformance?
The standard specifies a maximum water content of 0.1 weight %. This limit is critical for ensuring the material remains miscible without turbidity when mixed with 19 volumes of 99% heptane at 20 °C.
💡 How is the acidity of 2-ethoxyethanol tested?
The acidity, expressed as free acetic acid, is determined using ASTM D1613 (Test Method for Acidity in Volatile Solvents and Chemical Intermediates). The maximum permissible value for conformance is 0.01 weight %.
⚡ What rounding procedure applies to the specification limits?
Per Section 1.3, observed or calculated values must be rounded off “to the nearest unit” in the last right-hand digit of the specification limit. This must be performed in accordance with the rounding-off method of ASTM Practice E29.