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D4615-22 – Standard Test Method Technical Guide
ASTM D4615-22 provides a comprehensive specification for n-butyl acetate across all commercial grades, mainly intended for use as a solvent in paints, varnishes, lacquers, and related coatings. This article outlines the key requirements, referenced test methods, and essential technical details from the standard.
📜 Scope and Standard Practices
The scope of D4615-22 defines the material’s primary application and establishes core practices. The standard specifies that all values must be expressed in SI units, and no other units of measurement are included. For hazard information, users are directed to the supplier’s Material Safety Data Sheet (SDS). A critical technical note in the scope relates to the interpretation of test data: all observed or calculated values must be rounded “to the nearest unit” in the last right-hand digit of the specification limit, strictly following the rounding-off method outlined in Practice E29.
The standard is under the jurisdiction of Committee D01 on Paint and Related Coatings and Subcommittee D01.35 on Solvents, Plasticizers, and Chemical Intermediates. Originally approved in 1986 and reinstated in January 2022 (current edition approved January 1, 2022), it remains a key reference document for solvent quality control.
⚡ Technical Note: D4615 was withdrawn in January 2021 and reinstated in January 2022. This current 2022 edition is the active standard approved for use by agencies of the U.S. Department of Defense.
🧪 Property Requirements and Test Methods
Section 3 of the standard requires that n-butyl acetate conform to the requirements of one of the grades listed in Table 1. The table below summarizes the principal physical and chemical properties specified, along with their corresponding ASTM test methods.
| 🟦 Property | 📐 Specified ASTM Test Method | 🎯 Requirement (Typical Grade Limit) |
|---|---|---|
| Purity (by GC) | D3545 (Withdrawn 2021) | ≥ 99.0 % |
| Color (APHA / Pt-Co Scale) | D1209 or D5386 | ≤ 10 |
| Acidity (as Acetic Acid) | D1613 | ≤ 0.005 % |
| Water Content | D1364 (Karl Fischer Titration) | ≤ 0.1 % |
| Distillation Range | D1078 | 118 °C – 128 °C |
| Specific Gravity (20/20 °C) | D891 or D4052 (Digital Density Meter) | 0.880 – 0.885 |
| Nonvolatile Matter | D1353 | ≤ 5 mg/100 mL |
| Odor | D1296 (Withdrawn 2021) | Characteristic, Non-residual |
📌 Important Update for Lab Managers: Several test methods referenced in this specification, including D3545 (Purity of Acetate Esters by GC) and D1296 (Odor of Volatile Solvents), have been withdrawn without replacement as of 2021. Users should verify the availability of these methods or establish alternative quality control protocols.
🧰 Sampling and Conformance Assessment
Proper sampling is critical for accurate conformance assessment. The standard mandates that industrial chemicals be sampled in accordance with Practice E300. General guidance for sampling and testing volatile solvents for use in paints and coatings is further detailed in Guide D268. For specific gravity determination, the standard allows the use of either the traditional hydrometer method (Test Methods D891) or the modern digital density meter (Test Method D4052). Similarly, color can be assessed using the manual Platinum-Cobalt scale (D1209) or automated tristimulus colorimetry (D5386).
The standard also explicitly states that it does not address all safety concerns, if any, associated with its use. It is the responsibility of the user to establish appropriate safety, health, and environmental practices prior to use. Referenced documents also include U.S. Federal Specification PPP-C-2020 for the packaging of liquid chemicals.
✅ Conformance Tip: When reporting results to this standard, always apply the rounding rules of Practice E29. For example, if a specification limit is 0.005 % acidity, the determined value must be rounded to the nearest 0.001 % (the nearest unit in the last right-hand digit). This ensures strict consistency in pass/fail determinations.
❓ Frequently Asked Questions
🔍 What is the primary application covered by ASTM D4615-22?
The specification explicitly covers n-butyl acetate suitable for use as a solvent in paint and related coatings, varnishes, and lacquers. It covers “all grades” intended for this solvent use case.
💡 How should test results be rounded to determine conformance?
According to Section 1.2, observed or calculated values must be rounded “to the nearest unit” in the last right-hand digit used in expressing the specification limit, following the rounding method defined in Practice E29.
⚡ Are there any withdrawn test methods referenced in this standard?
Yes, Test Method D3545 (for purity of acetate esters by gas chromatography) and Test Method D1296 (for odor of volatile solvents) were withdrawn in 2021 without direct replacement. Users must verify their applicability or establish suitable alternative procedures for these requirements.
📌 Which sampling procedure is required by this specification?
The standard requires that samples of the industrial chemical be taken following the guidelines of Practice E300 for Sampling Industrial Chemicals, supplemented by the guidance provided in Guide D268 for volatile solvents used in coatings.