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D304-11 – Standard Test Method Technical Guide
🧪 Scope and Significance
ASTM D304-11 (Reapproved 2019) defines the standard specification for n-Butyl Alcohol (Butanol). This specification is critical for ensuring the quality and purity of butanol used in paints, coatings, and chemical manufacturing. The standard outlines specific property limits, sampling procedures, and test methods to which the material must conform. The values stated in SI units are to be regarded as standard. For hazard information and guidance, users are directed to consult the supplier’s Material Safety Data Sheets.
🔬 Conformance Rounding: Per Section 1.3, for purposes of determining conformance with this specification, an observed value or a calculated value must 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.
🔬 Required Chemical and Physical Properties
To meet the ASTM D304 standard, n-butyl alcohol must satisfy a strict set of chemical and physical requirements. The table below summarizes the mandatory limits and the corresponding ASTM test methods.
| 🧪 Property | 📏 Requirement | 📐 Test Method |
|---|---|---|
| Apparent Specific Gravity (20/20 °C) | 0.810 to 0.813 | D891 / D4052 |
| Apparent Specific Gravity (25/25 °C) | 0.807 to 0.810 | D891 / D4052 |
| Color, Pt-Co Scale, max | 10 | D1209 / D5386 |
| Distillation Range @ 760 mmHg | Within 1.5 °C, including 117.7 °C | D1078 |
| Nonvolatile Matter, max | 5 mg/100 mL | D1353 |
| Water Content, max | 0.1 weight % | D1364 |
| Acidity (as acetic acid), max | 0.005 weight % | D1613 |
✅ Color Measurement Note: 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 for this product. Both methods are acceptable.
📦 Sampling and Handling Requirements
Sampling of n-butyl alcohol must be conducted in accordance with Practice E300 to ensure representative samples are obtained. Packaging requirements fall under U.S. Federal Specification PPP-C-2020. The water content specification of 0.1 weight % max is particularly critical, as it guarantees the material’s miscibility performance with hydrocarbons.
⚠️ Heptane Miscibility: The 0.1% water limit ensures that the n-butyl alcohol is miscible without turbidity with 19 volumes of 99% heptane at 20 °C. This property is vital for maintaining clarity and performance in lacquer and coating applications (See Footnote C).
❓ Frequently Asked Questions
🔍 What is the specific gravity requirement for n-Butyl Alcohol per ASTM D304?
The material must exhibit an apparent specific gravity of 0.810 to 0.813 when tested at 20/20 °C, or 0.807 to 0.810 when tested at 25/25 °C.
💡 How strictly must the distillation range be met?
The standard requires that the sample distill entirely within a 1.5 °C range, and that this range must include the boiling point of 117.7 °C at 760 mmHg.
⚡ Can instrumental color measurement be used instead of visual Pt-Co comparison?
Yes. Test Method D5386 (Tristimulus Colorimetry) is accepted and has demonstrated no statistically significant difference from the visual comparison method D1209 for this specific material.
📌 What acidity level is considered acceptable for Butanol?
Acidity, calculated as acetic acid, must not exceed 0.005% by weight, as determined by Test Method D1613.