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D2693-22 – Standard Test Method Technical Guide
📜 Scope and Application
This specification, designated D2693-22, establishes the requirements for ethylene glycol intended specifically for use in the preparation of surface coatings. All values stated in SI units are regarded as the standard. For determining conformance with this specification, observed or calculated values must be rounded to the nearest unit in the last right-hand digit used in expressing the specification limit, in accordance with the rounding methodology of Practice E29.
⚙️ Required Properties and Test Methods
To conform to this specification, ethylene glycol must meet stringent physical and chemical property requirements. The primary analytical methods for evaluating these properties are detailed in Test Methods E202. Apparent specific gravity may also be determined using Test Method D4052. The table below summarizes the essential property requirements:
| 📏 Property | 🎯 Specification Limit | ⚡ Test Method |
|---|---|---|
| Apparent Specific Gravity (20/20 °C) | 1.1151 – 1.1156 | E202 / D4052 |
| Apparent Specific Gravity (25/25 °C) | 1.1129 – 1.1134 | E202 / D4052 |
| Color, Pt-Co Units, max | 15 | D1209 / D5386 |
| Distillation – Initial Boiling Point, min | 193 °C | E202 |
| Distillation – Dry Point, max | 204 °C | E202 |
| Water Content, wt%, max | 0.2 | E202 |
| Acidity (as acetic acid), wt%, max | 0.005 | E202 |
| Diethylene Glycol, wt%, max | 1.0 | E202 |
| Iron, ppm, max | 1.0 | E202 |
💡 Note on Color Testing: Instrumental Pt-Co color determined by Test Method D5386 has been shown to have no statistically significant difference from Pt-Co color determined by Test Method D1209. However, it is not known whether ethylene glycol was specifically part of the sample set included in the interlaboratory study for this correlation.
🧪 Sampling and Packaging Guidelines
Sampling of the material shall be conducted in accordance with Practice E300 (Practice for Sampling Industrial Chemicals). Packaging requirements for ethylene glycol must comply with U.S. Federal Specification PPP-C-2020 for chemicals. The specific package size and details are subject to agreement between the purchaser and the supplier.
⚠️ Safety and Hazard Information: For specific hazard information, safe handling practices, and emergency response guidance, consult the supplier’s Material Safety Data Sheet (SDS) prior to use.
❓ Frequently Asked Questions
🔍 What is the primary application of ethylene glycol under ASTM D2693-22?
This specification covers ethylene glycol specifically for use in the preparation of surface coatings.
💡 How should the material be sampled for conformance testing?
Sampling of the material must be performed in accordance with Practice E300 (Practice for Sampling Industrial Chemicals).
⚡ What are the acceptable test methods for determining the color of ethylene glycol?
Color can be determined using Test Method D1209 (Visual Pt-Co Scale) or Test Method D5386 (Instrumental Tristimulus Colorimetry).
📌 What rounding methodology applies to conformance with this specification?
An observed or calculated value shall be rounded off to the nearest unit in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29.