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D4058-96 – Standard Test Method Technical Guide
This article summarizes the key aspects of ASTM D4058-96 (Reapproved 2020), a standard test method for determining the attrition and abrasion resistance of catalysts and catalyst carriers.
📐 Sample Preparation and Geometry
The method applies to catalysts and carriers shaped as tablets, extrudate, spheres, or irregular particles. The particle size must be larger than approximately 1/16 in. (1.6 mm) and smaller than 3/4 in. (19 mm). A representative sample of 110 g is obtained by gentle splitting or quartering to avoid pre-attrition. The sample is presieved on a No. 20 (850 µm) ASTM sieve and dried in air for 3 h at 400°C. For materials that decompose at this temperature, the drying step may be modified or eliminated.
| 🟦 Parameter | 📏 Inch-Pound | 📐 SI Unit |
|---|---|---|
| Lower Particle Size | 1/16 in. | 1.6 mm |
| Upper Particle Size | 3/4 in. | 19 mm |
| Sample Mass | 110 g | 110 g |
| Drying Temperature | 400°C | 400°C |
⚙️ Test Procedure and Apparatus
The test involves rotating a sample in a cylindrical drum with a single baffle. The drum has an inside diameter of 10 in. (254 mm) and a length of 6 in. (152 mm). A radial baffle 2 in. (51 mm) high runs the full length of the cylinder. The inner surface must have a roughness no greater than 250 µin. (6.4 µm). The lid is secured with Allen-head screws or wing nuts to contain fines. Rotation is provided by a ball mill roller or similar device at the required speed.
| 🟦 Component | 📏 Dimension | 📐 SI Equivalent |
|---|---|---|
| Drum Diameter | 10 in. | 254 mm |
| Drum Length | 6 in. | 152 mm |
| Baffle Height | 2 in. | 51 mm |
| Surface Roughness | ≤ 250 µin. | ≤ 6.4 µm |
📊 Key Measured Properties
The test measures attrition and abrasion resistance by quantifying fines produced. After rotation, fines are determined by sieving through a standard sieve. The values are relative and significant when compared to other materials of similar size. For the materials used in developing this method, losses on attrition were less than 7%. This method indicates the propensity of a catalyst to generate fines during transportation, handling, and use.
⚠️ Important: No absolute level of acceptability is defined. Results are comparative and should be assessed against materials of comparable size.
❓ Frequently Asked Questions
🔍 What does this test method measure?
It measures the attrition and abrasion resistance of catalysts and catalyst carriers.
💡 What sample size is required?
A representative sample of about 110 g is needed.
⚡ What are the drum dimensions?
The drum has a diameter of 10 in. and a length of 6 in.
📌 How are results interpreted?
Results are comparative and indicate the propensity to produce fines during handling and use.