Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
D1152-24 – Standard Test Method Technical Guide
🧪 Product Specifications and Key Properties
ASTM D1152-24 defines the standard for Methanol (99.85% grade), also known as methyl alcohol. This specification serves as a general quality benchmark for a chemical produced through a wide variety of feedstocks and processes. The standard sets specific limits on purity, physical properties, and trace contaminants to ensure consistency across suppliers and applications.
The primary analytical criteria include a minimum assay of 99.85%, strict limits on water content (measured via ASTM D6304), and acidity (measured via ASTM D1613). Physical properties such as density (ASTM D4052), distillation range (ASTM D1078), and color (ASTM D5386) are also tightly controlled to ensure the solvent meets the required grade.
| 🟦 Property | 📏 Specification Limit | 🔬 ASTM Test Method |
|---|---|---|
| Assay (Purity) | 99.85 % min | Calculated by difference |
| Water Content | 0.10 % max | D6304 |
| Acidity (as Acetic Acid) | 0.003 % max (30 ppm) | D1613 |
| Density at 20 °C | 0.791 – 0.793 g/mL | D4052 |
| Color (Pt-Co Scale) | 5 max | D5386 |
| Distillation Range | 1.0 °C max (incl. 64.7 °C) | D1078 |
| Permanganate Time | 30 min min | D1363 |
| Nonvolatile Matter | 10 mg/L max | D1353 |
It is important to note that while these properties are typical, Section 1.1.1 explicitly acknowledges that “a wide range of different ways to produce methanol and a wide range of needs by methanol users” means that some of the properties listed in Section 3.2 may not be required for every application. Users should select the relevant parameters based on their specific end-use.
⚙️ Test Methods and Quality Assurance
D1152-24 relies on a comprehensive suite of standard test methods to ensure quality. Beyond the core properties, the standard references advanced trace analysis techniques for contaminants such as sulfur (D7183, D7359), nitrogen (D4629, D7184), chlorine (D7536, D7359), and water miscibility (D1722). These methods allow for accurate quantification of impurities that can affect catalyst performance or final product quality.
| 🟦 Contaminant | ⚡ Recommended Methods | 🎯 Detection Technique |
|---|---|---|
| Total Sulfur | D7183 / D7359 | UV Fluorescence / Combustion IC (CIC) |
| Total Nitrogen / Ultra Low N | D4629 / D7184 | Oxidative Combustion / Chemiluminescence |
| Chlorine | D7359 / D7536 | Combustion IC (CIC) / Monochromatic WDXRF |
| Water Miscibility | D1722 | Visual Turbidity |
💡 Compliance Tip: Section 1.2 of the standard mandates that all observed or calculated values be rounded “to the nearest unit” of the last right-hand digit of the specification limit, strictly following the rounding-off method of Practice E29. For example, if the acidity limit is 0.003 % max (3 in the third decimal place), a calculated value of 0.0034 % is rounded down to 0.003 % (pass), while 0.0035 % is rounded up to 0.004 % (fail).
⚠️ Safety and Regulatory Compliance: Per Sections 1.3, 1.5, and 1.6, it is the responsibility of the user to consult current OSHA regulations, local regulations, and the supplier’s Safety Data Sheet (SDS) for specific first aid instructions and proper handling equipment. This standard does not claim to address all safety concerns. Engineering controls and personal protective equipment must be evaluated by the user.
❓ Frequently Asked Questions
🔍 What is the minimum purity requirement for methanol under ASTM D1152-24?
The standard specifically covers methanol (99.85% grade). The minimum purity requirement is 99.85% by mass.
💡 Which test method is specified for determining the water content in methanol?
ASTM D6304, the Test Method for Determination of Water in Petroleum Products, Lubricating Oils, and Additives by Coulometric Karl Fischer Titration, is the referenced method for water analysis.
⚡ Are all the properties listed in the specification mandatory for every batch?
Not necessarily. Section 1.1.1 explicitly states that “a number of properties are included in 3.2. These are properties that may not be required by some users.” The specification is designed as a flexible general guide to accommodate different production methods and end-user needs.
📌 What rounding rules apply when determining conformance to D1152-24?
Section 1.2 requires that observed or calculated values be rounded “to the nearest unit” in the last right-hand digit of the expressed specification limit, following the procedures in Practice E29.