Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
D3539-11 – Standard Test Method Technical Guide
📐 Test Method Overview and Significance
The ASTM D3539-11 standard outlines test methods for determining evaporation rates of volatile liquids with low viscosity using the Shell thin-film evaporometer. These methods are applicable to a wide range of liquids, including paint solvents, varnishes, lacquers, hydrocarbons, and insecticide spray-base oils. The evaporation rate is crucial as it influences film deposition, flow, structure, and appearance in paints and related products. The test involves spreading a known liquid volume on a filter paper of known area, exposing it to dried air or nitrogen at 25°C, and monitoring weight loss over time.
⚙️ Manual Evaporometer Procedure (Test Method A)
Test Method A uses manual recording. A precise liquid volume is dispensed via syringe onto a filter paper with a known area. The filter paper is suspended from a sensitive balance in a constant-temperature cabinet. Dried air or nitrogen at 25°C is passed through the cabinet at a known rate. The weight loss is recorded over time and plotted to determine the evaporation rate. The apparatus includes a thin-film evaporometer and a temperature-controlled cabinet.
| 🟦 Parameter | 📏 Specification |
|---|---|
| Temperature | 25°C |
| Gas Supply | Dried air or nitrogen |
| Gas Flow Rate | Known and controlled |
| Liquid Volume | Accurately measured via syringe |
| Filter Paper Area | Known and consistent |
📊 Key Specifications and Units
The standard specifies SI units as standard, with values in parentheses for information. The test is limited to liquids with sufficiently low viscosity for syringe dispensing. Referenced standards include ASTM D891 for specific gravity and ASTM E1 for thermometers. Test Method A (Manual) covers Sections 5-11, and Test Method B (Automatic) covers Sections 12-17.
| 🟦 Aspect | 🎯 Details |
|---|---|
| Units | SI (primary), parentheses for reference |
| Viscosity Limitation | Low enough for syringe dispensing |
| Test Methods | Method A (Manual) and Method B (Automatic) |
⚠️ Safety Warning: When testing solvents, ensure proper ventilation as hazardous vapor concentrations may occur. See Sections 5.2 and 5.6 for specific safety precautions.
💡 Application Note: Use evaporation rate data to select solvents that optimize film performance in paints and coatings.
❓ Frequently Asked Questions
🔍 What is the principle of the Shell thin-film evaporometer?
A known liquid volume is spread on a filter paper, and its weight loss is measured under controlled temperature and airflow to determine the evaporation rate.
© 2026 TNLab — This article is a technical interpretation for reference only. The original standard as published by ASTM International takes precedence.