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D2634-07 – Standard Test Method Technical Guide
📝 Scope and Referenced Documents
ASTM D2634-07 (Reapproved 2021) defines the specification for Methyl Amyl Acetate (95% Grade), also known as 4-methyl-2-pentyl acetate. This standard covers a medium-boiling solvent specifically intended for use in paints, varnishes, lacquers, and related coating products. All values are stated in SI units.
⚠️ Safety Guidance: As stated in Section 1.3, users must consult the supplier’s Safety Data Sheet (SDS) for specific hazard information and safe handling procedures before using this material.
Conformance to the specification is strictly governed by the rounded limits. Per Section 1.4, observed or calculated values shall be rounded “to the nearest unit” in the last right-hand digit of the expressed specification limit, following the rounding procedure outlined in Practice E29. The standard references numerous ASTM methods for sampling (E300), packaging (PPP-C-2020), and specific testing procedures.
📊 Chemical and Physical Requirements
To qualify under this specification, the methyl amyl acetate must meet exacting compositional and physical properties. The mandatory limits are summarized in the table below.
| 📏 Property | 🎯 Specification Limit | ⚡ Test Method |
|---|---|---|
| Apparent Specific Gravity (20/20 °C) | 0.856 – 0.859 | D4052 |
| Apparent Specific Gravity (25/25 °C) | 0.852 – 0.855 | D4052 |
| Color, Pt-Co units, max | 15 | D1209 or D5386 |
| Distillation Range | Below 142.5 °C: None Above 149.5 °C: None |
D1078 |
| Nonvolatile Matter, mg/100 mL, max | 5 | D1353 |
| Water Content, wt %, max | 0.1 | D1364 |
| Acidity (as Acetic Acid), wt %, max | 0.01 | D1613 |
| Ester Value, wt %, min | 95.0 | D1617 |
💡 Alternative Test Method: While D1364 (Karl Fischer) is the required quantitative method for water determination, Section 3 Note 1 highlights Test Method D1476 (Heptane Miscibility) as a useful qualitative alternative, provided agreement exists between the user and the supplier.
⚙️ Sampling and Test Procedures
The standard requires that sampling of industrial chemicals be conducted in accordance with Practice E300 and the broader recommendations laid out in Guide D268. The testing regime relies on specific ASTM protocols designed for volatile solvents. Density and specific gravity are critically measured using a digital density meter per D4052. Color is assessed using the Platinum-Cobalt scale via D1209 or tristimulus colorimetry per D5386. The ester content, which defines the “95% Grade” purity of the product, is quantitatively determined by saponification in Test Method D1617. Comprehensive packaging guidelines for the safe transport of the liquid solvent are provided by the reference to Federal Specification PPP-C-2020.
❓ Frequently Asked Questions
🔍 What is the primary role of Methyl Amyl Acetate in paint and coating formulations?
It serves as a medium-evaporating solvent that provides excellent flow and leveling properties, effectively controlling the viscosity and drying characteristics of lacquers, varnishes, and enamels.
💡 What does the “95% Grade” classification specifically refer to in this standard?
The classification refers to the minimum Ester Value. Section 3 requires the material to have an ester content of at least 95.0 wt% (as determined by ASTM D1617), ensuring a high level of active solvent purity.
⚡ How tightly is the distillation range controlled for this high-purity solvent?
The standard mandates a very tight boiling range. According to the specification limits, no distillate should be collected below 142.5 °C and no distillate should be collected above 149.5 °C when tested per Test Method D1078.
📌 Is the use of Practice E29 mandatory for determining conformance?
Yes. Section 1.4 clearly states that for the purposes of determining conformance with this standard, observed or calculated values must be rounded off “to the nearest unit” in the last right-hand digit of the expressed specification limit, strictly following the rounding method in Practice E29.