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D6175-24 – Standard Test Method Technical Guide
📐 Specimen Geometry and Types
This test method is designed for extruded catalyst and catalyst carrier particles with a cylindrical shape, including solid, hollow core, or multilobed cross sections. The test was developed specifically for diameters from 1/16 in. to 1/8 in. (0.159 cm to 0.318 cm) and requires pieces with a length to diameter ratio of at least 1:1. This method may be applicable to other diameters with appropriate validation.
| 🟦 Parameter | 📏 Specification |
|---|---|
| Diameter (inch) | 1/16 to 1/8 |
| Diameter (cm) | 0.159 to 0.318 |
| Length/Diameter Ratio | ≥ 1:1 |
⚙️ Test Procedure and Speed Selection
Individual extrudates are selected from a representative sample following practices like ASTM B215 or E105. The specimens are calcined and measured for length. Each extrudate is placed between two smooth tool steel anvils, and a compressive force is applied at a uniform and controllable rate. The force required to crush the extrudate is recorded. The procedure is replicated for multiple specimens, and the crush force per millimeter is calculated for each.
The compression testing device must include a calibrated force gage with a range approximately twice the expected average force. The gage should be marked for direct reading in pounds-force or Newtons. The rate of force application must be controlled as per section 9.4 of the standard.
💡 Ensure the anvil faces are smooth and parallel to avoid irregular force application. The force gage range should be selected based on the expected mean crush strength to ensure accuracy.
📊 Key Measured Properties
The primary result is the mean crush strength per millimeter, derived by averaging the individual force per millimeter quotients from each test. This test method is suitable for strengths in the range of 0 to 15 lbf/mm (0 to 65 N/mm). The values are reported in inch-pound units as standard, with SI conversions provided for reference only.
The test provides information on the ability of the extruded catalyst to retain physical integrity during use, which is critical for its performance in catalytic applications.
| 🎯 Property | ⚡ Range |
|---|---|
| Mean Crush Strength (lbf/mm) | 0 to 15 |
| Mean Crush Strength (N/mm) | 0 to 65 |
⚠️ The inch-pound units are considered standard per ASTM D6175-24. The SI values in parentheses are mathematical conversions and are not part of the standard. Users must establish appropriate safety, health, and environmental practices.
❓ Frequently Asked Questions
🔍 What types of extruded catalysts are covered by this test?
This test method covers extruded catalyst and catalyst carrier particles with cylindrical cross sections, including solid, hollow core, or multilobed forms, suitable for diameters as specified.
💡 What are the required specimen dimensions for this test?
The standard requires diameters from 1/16 in. to 1/8 in. (0.159 cm to 0.318 cm) and a length to diameter ratio of at least 1:1. Other diameters may be applicable with validation.
⚡ How is the crush force measured and reported?
A calibrated compression testing device with a force gage range about twice the expected average force is used. The force is applied uniformly until the extrudate crushes. The mean crush strength per millimeter is calculated and reported.
📌 What safety considerations should be taken into account?
The standard does not purport to address all safety concerns. Users are responsible for establishing appropriate safety, health, and environmental practices and determining regulatory applicability.