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D6 解读
The ASTM D6/D6M-95 (Reapproved 2024) standard, also designated as AASHTO T47, provides a procedure for determining the loss in mass (exclusive of water) of oil and asphaltic compounds under controlled thermal conditions. This test method is widely used for characterizing the volatility of petroleum products and serves as a key quality control metric.
📐 Apparatus Configuration and Specimen Requirements
The core apparatus must be an electrically heated oven conforming to Specification E145, Type I, Grade B, for operating temperatures up to 180 °C [365 °F]. The oven must be rectangular with a minimum interior dimension of 330 mm [13 in.] in every direction. A rotating shelf is mandatory to ensure uniform heat distribution across all specimens throughout the 5-hour heating period. The oven door must be tightly fitting and hinged, providing a clear opening substantially matching the interior dimensions. An observation window of at least 100 by 100 mm [4 by 4 in.] is required, composed of two glass sheets separated by an air space.
| 🟦 Standard Parameter | 📏 SI Value | 📐 Inch-Pound Value |
|---|---|---|
| Specimen Mass | 50 g | ~1.76 oz |
| Specimen Dish Diameter | 55 mm | ~2.17 in |
| Heating Temperature | 163 °C | 325 °F |
| Heating Duration | 5 h | 5 h |
| Oven Performance Grade | E145 Type I, Grade B | E145 Type I, Grade B |
⚙️ Test Execution and Measurement Protocol
The test procedure requires spreading exactly 50 g of the sample material evenly across the 55 mm dish. The oven must be preheated and stabilized at 163 °C [325 °F] in moving air with the rotating shelf actively engaged. The specimen is heated for precisely 5 hours. After heating, the specimen is cooled and the percentage loss of mass is calculated. For further characterization, properties such as penetration (per Test Method D5/D5M) can be compared between the original and heated specimen.
⚠️ Critical Reminder on Unit Systems: Values stated in SI units and inch-pound units are not exact equivalents. To ensure full conformance with the standard, each system of units must be used independently of the other. Combining values from both systems is strictly prohibited.
💡 Relative Measurement and Safety Scope: This test method provides only a relative measurement of volatility and specifically excludes water loss. The user is responsible for establishing all appropriate safety, health, and environmental practices prior to conducting the test, as the method does not purport to address all potential safety concerns.
| 🔧 Oven Component | 🎯 Specification Requirement |
|---|---|
| Interior Dimensions | Minimum 330 mm [13 in.] in each direction |
| Ventilation | Adequate convection currents for air entry and vapor/air exit (per E145) |
| Rotating Shelf | Mandatory; properly placed and rotating during the test |
| Door Construction | Tightly fitting, hinged, with inner glass door or double-glazed window |
| Thermometer Compliance | Must conform to Specification E1 (ASTM Liquid-in-Glass Thermometers) |
❓ Frequently Asked Questions
🔍 What is the primary purpose of ASTM D6 / AASHTO T47?
The standard determines the loss in mass (exclusive of water) of oil and asphaltic compounds under controlled heating. It provides a relative measurement of a material’s volatility, which is used for the characterization of petroleum products.
💡 What are the key oven specifications required for compliance?
The oven must be electrically heated and conform to Specification E145, Type I, Grade B, with a rotating shelf. It must have minimum interior dimensions of 330 mm [13 in.] and an observation window of at least 100 x 100 mm [4 x 4 in.].
⚡ What are the exact test conditions for the specimen?
Exactly 50 g of material is spread in a 55 mm diameter dish and heated for 5 hours at 163 °C [325 °F] in moving air within the regulated oven environment.
📌 How should the results of this test be interpreted?
The result is reported as a percentage loss of mass. The test is strictly relative and does not measure absolute volatility. For deeper analysis, properties like penetration (per D5/D5M) can be compared before and after the heating procedure.