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D2349-90 – Standard Test Method Technical Guide
🧪 Overview and Scope of ASTM D2349 −90
ASTM D2349 −90 (Reapproved 2020) defines a standard test method for the qualitative determination of the nature of solvent composition in solvent-reducible paints. Under the jurisdiction of ASTM Subcommittee D01.21, this method is specifically intended for house paints containing only hydrocarbon solvents. The values stated in SI units are to be regarded as the standard.
The procedure relies on steam distillation at controlled temperatures to separate the volatile hydrocarbon solvent phase from the paint matrix. The recovered solvent is then subjected to qualitative chemical analysis using specified reagents to determine its composition. This standard was developed in accordance with internationally recognized standardization principles.
⚠️ Scope Limitation: This test method is strictly applicable to paints containing only hydrocarbon solvents. It is the responsibility of the user to establish appropriate safety, health, and environmental practices prior to use. This standard does not purport to address all safety concerns.
🧴 Reagent Specifications and Purity Requirements
Unless otherwise indicated, all chemicals must conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society. Water referenced in this standard is understood to mean reagent water conforming to Type IV of Specification D1193.
| 🟦 Reagent | 📏 Specification | 🎯 Role in Analysis |
|---|---|---|
| Antimony Pentachloride | Reagent Grade (SbCl5) | Chromogenic reagent for hydrocarbon characterization |
| Chloroform | Reagent Grade | Diluent and extraction solvent |
| Nitric Acid (HNO3) | Concentrated (sp gr 1.42) | Qualitative test reagent |
| Sulfuric Acid (H2SO4) | Concentrated (sp gr 1.84) | Layer separation and characterization |
| Reagent Water | Type IV per D1193 | Steam carrier for distillation process |
🚨 Corrosive Hazard: Antimony Pentachloride (SbCl5) is a highly corrosive fuming liquid. Concentrated nitric and sulfuric acids are strong oxidizers. All work must be completed in a properly functioning fume hood with full chemical splash protection.
⚙️ Sample Preparation and Distillation Procedure
The sample is first mixed and prepared in accordance with Practice D215. The test procedure requires a 150 g sample of the paint to be placed into a 500-mL flask fitted with a 2-hole cork stopper. The assembly is equipped with a spray trap connected to a condenser. An influx tube for steam is passed through the second hole, ensuring it dips below the paint surface.
- Heat the flask in an oil or air bath to 100°C and pass a current of steam through the sample.
- While maintaining the steam flow, raise the bath temperature to 130°C.
- Catch the distillate in a small separatory funnel.
- Continue the steam distillation until 300 mL of water has been collected in the funnel.
- Water may be drawn from the cock of the separatory funnel periodically, but extreme caution is required to avoid drawing out the volatile solvent layer.
| 📐 Parameter | ⚡ Specification |
|---|---|
| Sample Mass | ~150 grams |
| Distillation Vessel | 500-mL flask |
| Initial Bath Temperature | 100°C |
| Secondary Bath Temperature | 130°C |
| Required Water Distillate Volume | 300 mL |
The qualitative analysis of the separated hydrocarbon phase is then conducted using the listed reagents to determine the nature of the solvent composition in the original paint sample.
❓ Frequently Asked Questions
🔍 What types of paints are covered by ASTM D2349 −90?
This standard specifically covers solvent-reducible house paints that contain only hydrocarbon solvents. It is not applicable to paints containing oxygenated solvents or other complex solvent blends.
💡 What is the required purity for water used in this test?
References to water in the standard are understood to mean reagent water conforming to Type IV of ASTM Specification D1193. This ensures a consistent baseline for the steam distillation process.
⚡ What are the specific temperature stages required for the distillation?
The procedure calls for an initial bath temperature of 100°C while steam is introduced. The temperature is then raised to 130°C. Distillation continues until 300 mL of water has