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D3548-09 – Standard Test Method Technical Guide
ASTM D3548 – 09 (Reapproved 2023) defines the standard specification for ethyl acrylate (99 % grade) intended for use in paint, varnish, lacquer, and related coating products. Under the jurisdiction of ASTM Subcommittee D01.35, this standard establishes precise property limits, verifiable by specific test methods, and outlines critical safety precautions for handling this monomeric ester.
🧪 Chemical and Physical Specification Requirements
To ensure product quality and consistency, ethyl acrylate must conform to the detailed physical and chemical requirements listed in the table below. All values are tested in accordance with the referenced standard test methods.
| 🟦 Property | 📏 Specification Limit | 🎯 Test Method |
|---|---|---|
| Purity (as ethyl acrylate), wt % | 99.5 min | D3362 |
| Water content, wt % | 0.08 max | D1364 |
| Color, Pt-Co scale | 10 max (bulk) 20 max (drum) |
D1209 or D5386 |
| Acidity (as acrylic acid), wt % | 0.008 max | D1613 |
| Methyl ether of hydroquinone (MEHQ), wppm | 10 minA | D3125 |
A Lower MEHQ levels may be agreed upon between the purchaser and the manufacturer. However, lower levels are not recommended for safety reasons.
💡 Tip on Color Analysis: The standard allows the use of instrumental Test Method D5386 as an alternative to visual Test Method D1209. Interlaboratory studies indicate no statistically significant difference between the two methods. It is important to note, however, that ethyl acrylate may not have been part of the specific interlaboratory sample set used for this validation.
📏 Test Methods and Compliance Procedures
Conformance with ASTM D3548 requires rigorous adherence to the sampling, rounding, and testing protocols defined by the referenced standards. Sampling of the chemical shall be conducted in accordance with Practice E300. For the purposes of determining compliance, all observed or calculated values must be rounded off “to the nearest unit” in the last right-hand digit of the specification limit, following the method prescribed in Practice E29.
The standard relies on a suite of well-established analytical techniques to verify each property:
- Gas Chromatography (D3362) is used to determine purity and the concentration of specific organic impurities.
- Karl Fischer Titration (D1364) quantifies the low water content to ensure product stability.
- Colorimetry (D1209 / D5386) assesses the visual and instrumental color against the Platinum-Cobalt scale.
- Titration (D1613) measures free acidity, expressed as acrylic acid.
- Inhibitor Analysis (D3125) quantifies the methyl ether of hydroquinone (MEHQ) concentration.
⚠️ Important Safety Compliance: This standard does not purport to address all safety concerns. It is the responsibility of the user to establish appropriate safety, health, and environmental practices. Specific hazard and precautionary statements are provided in Section 4.1 of the standard. Always review the supplier’s Safety Data Sheet (SDS) for complete handling, storage, and emergency information.
⚠️ Safety, Storage, and Handling
Ethyl acrylate is a reactive monomer that can polymerize if exposed to heat, light, or contamination. Section 4 of the standard provides specific precautionary instructions. All samples must be stored in amber bottles or otherwise fully protected from light. Storage areas must be cool and free from potential sources of heat or ignition. The specified inhibitor, methyl ether of hydroquinone, requires the presence of dissolved oxygen to function effectively; therefore, exposure to air should not be entirely restricted unless alternative safety measures are in place.
❓ Frequently Asked Questions
🔍 What is the minimum purity requirement for ethyl acrylate per D3548?
Ethyl acrylate must have a minimum purity of