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D2364-15 – Standard Test Method Technical Guide
ASTM D2364-15 (Reapproved 2021) provides standardized test methods for evaluating the physical and chemical properties of hydroxyethylcellulose (HEC), a critical rheology modifier in paints, coatings, and personal care products. Under the jurisdiction of Subcommittee D01.36, these methods ensure consistency and reliability in quality control.
🧪 Overview of Standard Test Methods (Sections 1-3)
The standard encompasses four primary procedures for complete characterization of HEC:
- Moisture (Sections 4-9): Determination of volatile content to calculate total solids.
- Ash (Sections 10-17): Measurement of sulfated ash to evaluate inorganic residue.
- Viscosity (Sections 18-23): Assessment of solution rheology.
- Density (Sections 24-30): Determination of apparent density.
The standard mandates the use of reagent grade chemicals conforming to the specifications of the Committee on Analytical Reagents of the American Chemical Society. All references to water imply reagent water meeting the requirements of ASTM D1193.
| 🔬 Test Method | 📏 Sections | 🎯 Primary Data Output |
|---|---|---|
| Moisture | 4 – 9 | Volatile content / Total Solids |
| Sulfated Ash | 10 – 17 | Inorganic residue content |
| Viscosity | 18 – 23 | Solution viscosity |
| Apparent Density | 24 – 30 | Density of the material |
⚠️ Regulatory Responsibility
This standard does not purport to address all safety concerns. It is the responsibility of the user to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
⚙️ Moisture Content Determination (Sections 4-9)
This test method covers the determination of the volatile content of hydroxyethylcellulose. The results are critically used for calculating the total solids in the sample. By common usage, all materials volatile at the designated test temperature are reported as moisture.
Significance and Use: Moisture analysis, alongside sulfated ash, provides a direct measure of the amount of active polymer present in the material. This data is indispensable for formulators determining the correct dosage of HEC to achieve target rheological properties.
Apparatus and Procedure
The test employs a gravity-convection oven capable of maintaining a temperature of 105 ± 3°C. Samples are handled using low-form weighing bottles (50 mm in inside diameter by 30 mm in height) and must be weighed on an analytical balance.
The standard procedure requires weighing 5 g of the sample to the nearest 0.001 g in a tared, covered weighing bottle.
| 🟦 Parameter | 📐 Specification |
|---|---|
| Oven Type | Gravity-convection |
| Oven Temperature | 105 ± 3°C |
| Weighing Bottle Dimensions | 50 mm (ID) x 30 mm (Height) |
| Sample Mass Required | 5 g, measured to ± 0.001 g |
💡 Key Technical Insight
The combination of moisture content and sulfated ash allows the analyst to precisely quantify the amount of active polymer in the HEC sample. This is essential for accurate formulation and quality assurance of the final product.
📊 Data Interpretation and Standard Compliance
The standard is specific in its unit requirements. Values stated in SI units are regarded as the standard; any values provided in parentheses are for informational purposes only. When evaluating the purity of reagents not specifically listed by the American Chemical Society, users must first ascertain the reagent is of sufficiently high purity to permit its use without lessening the accuracy of the determination, as stipulated in Section 3.1.
📌 Referenced Documents
For complete testing, users should also reference ASTM D1193 (Reagent Water) and ASTM D4794 (Determination of Ethoxyl or Hydroxyethoxyl Substitution) as part of the overall material characterization framework.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D2364-15?
These test methods cover the testing of hydroxyethylcellulose, including procedures for moisture, ash, viscosity, and density.
💡 What is the significance of the moisture test method?
It is used for calculating total solids in the sample. Along with sulfated ash, it measures the amount of active polymer, which must be considered when formulating with HEC.
⚡ What are the specific apparatus requirements for the moisture test?
The test requires a gravity-convection oven at 105 ± 3°C, low-form weighing bottles (50 mm ID x 30 mm height), and an analytical balance capable of measuring 5 g of sample to the nearest 0.001 g.
📌 What are the reagent purity requirements?
Reagent grade chemicals shall be used, conforming to the specifications of the Committee on Analytical Reagents of the American Chemical Society. Water must conform to ASTM D1193.