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D5349-19 – Standard Test Method Technical Guide
ASTM D5349-19, formally known as the Standard Test Method for the Determination of the Moisture and Volatile Content of Sulfonated, Sulfated Oils and Fatliquors by Oven Method, is a critical procedure for quality control in the leather finishing and industrial lubricant industries. By providing a clear, gravimetric approach to quantifying volatile components, this standard helps manufacturers ensure product consistency and conformance to specifications.
🔬 Scope and Significance
The scope of ASTM D5349-19 (Section 1.1) explicitly covers the determination of moisture and other volatile materials under the specific conditions of the test. It is widely applicable to sulfonated and sulfated oils, fats, fatliquors, and softening compounds. The standard mandates that values be recorded in SI units (Section 1.2).
Significance and Use (Section 3.1) identifies this test as a fundamental tool for evaluating the composition of these materials. The presence of excess moisture or volatile solvents can drastically affect the performance of fatliquors in leather processing. Users are responsible for implementing appropriate safety protocols, as the standard does not cover all potential safety hazards (Section 1.3). This international standard was developed in accordance with the WTO TBT principles (Section 1.4).
⚠️ Safety and Compliance: As stated in Section 1.3, this standard does not purport to address all safety concerns. It is the user’s responsibility to establish safe handling and disposal practices. Ensure adequate ventilation and personal protective equipment when handling and heating these chemicals.
⚙️ Apparatus Requirements and Test Procedure
The method relies on the precise measurement of mass loss after a controlled drying period. The apparatus requirements specified in Section 4 are strict to ensure repeatability across different laboratories.
| 🟦 Required Apparatus | 📏 Specification (Section 4) |
|---|---|
| Drying Oven | Mechanical-convection draft; capable of setting at 100–105 °C with a thermoregulatory system |
| Glass Beaker | 100 to 150 mL capacity |
| Desiccator | Contains an efficient desiccant |
| Analytical Balance | Capable of reading at a minimum of 3 decimal places (0.001 g) |
The testing procedure from Section 5 is straightforward but requires strict adherence to detail:
- Preparation: A beaker is dried and cooled in a desiccator. The empty weight (B) is recorded (Section 5.1).
- Weighing: A well-mixed sample of exactly 0.5 g (S) is accurately weighed into the beaker (Section 5.2).
- Heating: The beaker is placed in the oven, set to 105 °C, for exactly 1 hour (Section 5.3).
- Cooling and Final Weighing: The beaker is removed, cooled to room temperature in a desiccator, and reweighed. This is the weight of the dried sample plus beaker (D) (Section 5.3).
💡 Key Technical Note: The efficiency of the desiccant is critical. If the desiccant is exhausted, the dried sample can reabsorb moisture during cooling, leading to a significant positive bias in the calculated volatile content. Regularly check and regenerate the desiccant as needed.
📊 Calculation, Reporting, and Precision
The calculation determines the percentage of volatile matter lost during the drying process. All data must be reported in reference to ASTM D5349 (Section 6.2).
Formula (Section 6.1):
% Volatile matter (moisture) = [(S + B) - D] / S × 100
| 🎯 Variable | 📐
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