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D3540-12 – Standard Test Method Technical Guide
📐 Scope, Sampling, and Referenced Documents
ASTM D3540-12 defines the standard specification for synthetic primary amyl acetate (98% grade). Primarily used as a solvent in paints, lacquers, and industrial coatings, this standard specifies the material’s required purity and physical properties. Sampling of the material shall be conducted in accordance with Practice E300. The values stated in SI units are regarded as the standard. For specific safety and hazard information, users must consult the supplier’s Material Safety Data Sheet (MSDS).
⚠️ All specified limits in this standard require observed or calculated values to be rounded off “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the rounding method of Practice E29.
⚙️ Physical and Chemical Specifications
To conform to D3540-12, synthetic primary amyl acetate must meet stringent property limits. The following table summarizes the mandatory requirements.
| 🟦 Property | 📐 Requirement | 🎯 Test Method |
|---|---|---|
| Apparent Specific Gravity (20/20°C) | 0.874 to 0.879 | D4052 |
| Apparent Specific Gravity (25/25°C) | 0.870 to 0.875 | D4052 |
| Color, Pt-Co units, max | 15 | D1209 / D5386 |
| Distillation @ 760 mmHg | IBP min 142°C / Dry max 152°C | D1078 |
| Water, wt%, max | 0.2 | D1364 |
| Acidity (as acetic acid), wt%, max | 0.01 | D1613 |
| Ester Value, wt%, min | 98.0 | D1617 |
🔬 The standard permits the use of instrumental Pt-Co color determination by Test Method D5386 (Tristimulus Colorimetry), which has shown no statistically significant difference from Test Method D1209, providing flexibility in laboratory analysis.
📊 Test Methods for Conformance
Several specific ASTM test methods are referenced to ensure uniform testing procedures. The distillation range is determined by Test Method D1078, water content by Test Method D1364 using Karl Fischer titration, acidity by Test Method D1613, and the ester value by Test Method D1617. Specific gravity is measured using a digital density meter per Test Method D4052.
| 📘 Standard | 📏 Parameter |
|---|---|
| D1078 | Distillation Range |
| D1209 / D5386 | Color (Pt-Co) |
| D1364 | Water Content |
| D1613 | Acidity |
| D1617 | Ester Value |
| D4052 | Specific Gravity |
❓ Frequently Asked Questions
🔍 What is the minimum purity required by ASTM D3540?
The specification mandates a minimum ester value of 98.0 weight percent, which defines the 98% grade of the synthetic primary amyl acetate.
💡 How must the material be sampled for conformance testing?
Sampling must be performed according to ASTM Practice E300, which provides the standard guidelines for sampling industrial chemicals.
⚡ What are the specific gravity requirements for this solvent?
The apparent specific gravity must be between 0.874 and 0.879 at 20/20°C, or between 0.870 and 0.875 at 25/25°C, depending on the testing temperature selected.
📌 What is the maximum allowable water content?
The maximum water content by weight is 0.2%, as determined by Test Method D1364 (Karl Fischer Reagent Titration Method).