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D4180-23 – Standard Test Method Technical Guide
📐 Particle Types and Size Range
ASTM D4180-23 covers formed catalyst and carrier particles including extrudates, spheres, and pellets with nominal diameters between 0.8 mm (1/32 in) and 4.8 mm (3/16 in). Values stated in SI units are standard; inch-pound units are provided for reference only.
| 🟦 Particle Type | 📐 Nominal Diameter (mm) | 📏 Nominal Diameter (in) |
|---|---|---|
| Extrudates | 0.8 – 4.8 | 1/32 – 3/16 |
| Spheres | 0.8 – 4.8 | 1/32 – 3/16 |
| Pellets | 0.8 – 4.8 | 1/32 – 3/16 |
⚙️ Test Apparatus and Procedure
Essential apparatus includes a 250 mL glass cylinder conforming to Specification E1272 Class A, a handheld vibrator with hard rubber or metal impactor, a feed funnel, a ring stand with clamps, a desiccator with molecular sieve (e.g., No. 4A), a balance with 0.1 g sensitivity, and a drying oven.
| 🔧 Component | 📏 Specification |
|---|---|
| Glass Cylinder | 250 mL, E1272 Class A |
| Balance | Sensitivity 0.1 g |
| Vibrator | Handheld, hard rubber or metal impactor |
| Desiccator | With molecular sieve (No. 4A) |
| Drying Oven | For sample preconditioning |
The test involves preconditioning the sample, filling the cylinder via the feed funnel, vibrating until no further settling occurs, and measuring the final volume. Vibratory packing density is calculated from the known mass and vibrated volume.
The sample must not break up during sampling, filling, or vibrating to ensure accurate results.
📊 Vibratory Packing Density and Sampling
Vibratory packing density is determined as mass divided by vibrated volume. This value is critical for catalyst packing and reactor loading. Samples must be obtained by riffling or splitting from larger composites in accordance with Practices B215 and E105 to ensure representativeness. Refer to Terminology D3766 and Practice E691 for precision guidance.
Users must establish appropriate safety and health practices; this standard does not address all safety concerns.
❓ Frequently Asked Questions
🔍 What is vibratory packing density?
It is the density of a catalyst sample after being vibrated in a cylinder, calculated from mass and vibrated volume.
💡 What particle sizes are applicable?
The standard covers particles with nominal diameters from 0.8 mm to 4.8 mm (1/32 in to 3/16 in).
⚡ What apparatus is required?
A 250 mL glass cylinder (E1272 Class A), a vibrator with hard rubber or metal impactor, a balance with 0.1 g sensitivity, and a desiccator with molecular sieve.
📌 Why is sample preconditioning necessary?
It ensures consistent moisture content and stabilizes the sample to prevent breakage during vibration.