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D1353-13 – Standard Test Method Technical Guide
🔬 Scope and Significance of the Test Method
ASTM D1353-13 (Reapproved 2021) establishes a standardized procedure for quantifying the nonvolatile matter (residue) present in volatile solvents intended for use in paints, varnishes, lacquers, and related coatings. This test is critical for quality control, ensuring that solvents expected to be 100% volatile at 105 °C ± 5 °C do not contain residual solids that can compromise film integrity, clarity, or overall manufacturing process efficiency. The method serves as an essential analytical tool for both solvent producers and end-users in the coatings industry.
⚙️ Required Apparatus and Test Conditions
The standard specifies precise apparatus requirements to ensure accurate and reproducible results. The oven must be thermostatically controlled to maintain a strict temperature of 105 °C ± 5 °C throughout the entire evaporation period. An evaporating dish, preferably constructed from platinum with a 125-mL capacity, is specified to hold the sample. A 100 mL graduated cylinder is designated for the volumetric transfer of the solvent. Finally, an analytical balance with a precision of ±0.1 mg is essential for accurately measuring the minute quantities of residual matter.
| 🟦 Equipment Item | 📏 Specification Requirement |
|---|---|
| Oven | Thermostatically controlled, 105 °C ± 5 °C |
| Evaporating Dish | Platinum, 125-mL (preferred). Aluminum or porcelain may be used. |
| Graduated Cylinder | 100 mL capacity |
| Analytical Balance | Precision to ±0.1 mg |
⚠️ Safety Considerations: Always consult the supplier’s Safety Data Sheet (SDS) for the solvents being tested. The user of this standard is responsible for establishing appropriate safety, health, and environmental practices. Specific hazard statements are addressed in Section 5 of the standard.
📊 Test Procedure and Key Measured Properties
The test procedure is straightforward but demands strict attention to detail. The evaporating dish is first cleaned, dried, and tared to a constant weight. A 100 mL sample of the volatile solvent is measured using the graduated cylinder and quantitatively transferred into the prepared dish. The dish is then placed in the oven at 105 °C ± 5 °C and heated until the solvent has completely evaporated, leaving only the nonvolatile residue. After cooling the dish in a desiccator to prevent moisture absorption, it is reweighed. The increase in mass over the tare weight represents the nonvolatile matter content. Conformance with specification limits is determined by rounding the final value in accordance with Practice E29.
| 📐 Parameter | 🎯 Value / Detail |
|---|---|
| Sample Volume | 100 mL |
| Evaporation Temperature | 105 °C ± 5 °C |
| Balance Sensitivity | 0.1 mg |
| Result Expression | Nonvolatile Matter (mg/100 mL) |
💡 Important Note on Precision (Note 1): The precision data established for this test method were determined exclusively using platinum evaporating dishes. Users choosing alternative dish materials should be aware that procedural precision may vary from the stated values.
❓ Frequently Asked Questions
🔍 What types of solvents does this test method cover?
This test method covers the determination of nonvolatile matter in volatile solvents specifically intended for use in paint, varnish, lacquer, and related products. It applies to solvents expected to be substantially 100% volatile at 105 °C.
💡 Why is a platinum dish specified as the preferred apparatus?
A platinum evaporating dish is preferred due to its high resistance to corrosion and constant weight at high temperatures. Crucially, the precision data reported in the standard was developed exclusively using platinum dishes, making them the reference material for highest accuracy.
⚡ What oven temperature stability is required for this test?
The oven must be thermostatically controlled to maintain a temperature of 105 °C ± 5 °C. Tight control over the evaporation temperature is essential for consistent and reproducible results.
📌 How is the test sample prepared for analysis?
A 100 mL sample of the solvent is precisely measured using a graduated cylinder and transferred into a tared 125-mL evaporating dish. This specific volume is the standard sample size required for the test procedure.