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D4513-22 – Standard Test Method Technical Guide
ASTM D4513-22 outlines a standardized dry-sieving method for determining the particle size distribution of catalytic powder materials. This technique is vital for material specifications, manufacturing quality control, and research and development.
🛠️ Apparatus and Sieve Specifications
The test relies on a specific set of laboratory equipment. The core apparatus is a laboratory sieving instrument (automatic with timer preferred). The required sieve stack incorporates U.S. Standard sieves and highly precise electroformed sieves.
| ⬛ Sieve Type / Mesh | 📏 Opening (µm) |
|---|---|
| U.S. Std. 40 | 425 |
| U.S. Std. 60 | 250 |
| U.S. Std. 80 | 177 |
| U.S. Std. 100 | 149 |
| U.S. Std. 140 | 105 |
| U.S. Std. 200 | 74 |
| U.S. Std. 325 | 44 |
| Electroformed | 30 |
| Electroformed | 20 |
Supporting apparatus includes an analytical balance (readability to 0.001 g), a 300× transmitted light microscope with a calibrated scale eyepiece, a 100 W ultrasonic cleaning tank, and a sample splitter (spinning riffler preferred).
💡 Tip: Electroformed sieves with square holes are recommended over woven wire sieves due to their superior uniformity and greater resistance to distortion or damage during use. Sieves with diameters between 6 and 10 cm are suggested.
⚙️ Sample Preparation and Test Procedure
A sample of known weight must be equilibrated to 50% relative humidity before testing. To mitigate electrostatic attraction, an antistatic coating is applied. The sample is then placed on the top sieve and fractionated by the sieving instrument.
After sieving, the fraction collected on each sieve is weighed. Its fractional part of the original sample weight is calculated to generate the particle size distribution curve.
⚡ Important Note: The standard specifies the use of an alcohol-water solution (1 part ethanol to 9 parts deionized water) for ultrasonic cleaning of the sieves. After cleaning, sieves should be dried with a heat gun and inspected under the 300× microscope with a calibrated scale eyepiece to ensure no openings are blocked or damaged.
📊 Key Measured Properties and Significance
The primary measurables are the weights retained on each sieve, translated into mass percentages. This particle size distribution is crucial for defining catalyst specifications, controlling manufacturing processes, and predicting catalyst performance in industrial applications.
© 2026 TNLab — This article is a technical interpretation for reference only. The original standard as published by ASTM International takes precedence.