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D5004-23 – Standard Test Method Technical Guide
📐 Specimen Preparation and Sieve Requirements
The test method outlined in ASTM D5004‑23 requires the calcined petroleum coke specimen to be ground to a particle size smaller than 75 µm, passing through a No. 200 sieve as per ASTM E11. This precise size reduction is essential to eliminate pores and voids, ensuring that the real density measurement reflects the true solid volume of the material. Sample collection and preparation should follow practices such as D6970 for collection and D6969 for preparation. The following table summarizes the sieve specification:
| 🟦 Sieve Designation | 📏 Opening Size | 🎯 Standard Reference |
|---|---|---|
| No. 200 | 75 µm | ASTM E11 |
⚙️ Test Procedure and Xylene Displacement
The real density is determined using xylene displacement, where xylene serves as the fluid to fill all accessible pores. The specimen is first ground to pass through the No. 200 sieve and dried to constant weight. The procedure involves introducing the specimen into a pycnometer, filling with xylene, and carefully removing air bubbles. The density is calculated from the mass and volume measurements. Safety precautions are critical due to the flammable nature of xylene; refer to Sections 10 and 11.1 of the standard for specific warnings.
⚠️ Warning: Xylene is flammable and toxic. Handle with care in a fume hood and follow all safety guidelines from Sections 10 and 11.1.
📊 Key Measured Properties and Definitions
ASTM D5004‑23 defines real density (RD) as the mass divided by the volume occupied by the material excluding pores and voids, achieved when particles are smaller than 75 µm. Other relevant terms include bulk density, which considers inter‑particle space, and dedusting material as per Test Method D4930. The table below outlines key definitions:
| 🟦 Term | 📏 Definition | ⚡ Application |
|---|---|---|
| Real Density | Mass/volume excluding pores | Determined via xylene displacement with particles < 75 µm |
| Bulk Density | Mass/volume including inter‑particle space | Refer to Test Methods D4292 and D7454 |
💡 Tip: For accurate results, ensure the specimen is completely dry and ground to pass through the No. 200 sieve before measurement.
❓ Frequently Asked Questions
🔍 What is real density of calcined petroleum coke? Real density is the mass per unit volume of the solid material excluding pores and voids, measured after grinding to < 75 µm as per D5004‑23.
💡 Why is xylene used as the displacement fluid? Xylene effectively fills pores and voids in the coke particles, ensuring accurate volume measurement of the solid portion of the material.
⚡ What particle size is required for this test method? The specimen must be ground to pass through a 75 µm (No. 200) sieve to meet the real density definition.
📌 How does this test method relate to other density tests? This method measures real density excluding pores, while other tests like vibrated bulk density (D4292, D7454) measure bulk density including inter‑particle space.