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D6344-04 – Standard Test Method Technical Guide
📐 Apparatus and Specimen Requirements
The impactor defined in Section 5.1 is a solid steel cylindrical rod with a full radius hemispherical end. It is 32 mm ± 2 mm in diameter, approximately 115 mm in length, and has a total mass of 680 g ± 15 g including any eye-bolt attachment. The hemispherical end concentrates the impact force to simulate real-world hazards. Specimen packages are complete filled transport packages such as thin-fluted corrugated boxes or stretch-wrapped packaging, conditioned per Practice D4332.
⚙️ Test Procedure and Significance
This test method evaluates packaging’s resistance to concentrated impacts from transportation and handling as described in Section 4. The guided free-fall drop from a prescribed height simulates impacts from adjacent freight, bumps during loading, or conveyor sorting. Results are pass/fail based on pre-established acceptance criteria, and the energy dissipated during impact is recorded. Modified procedures, such as incremental height increase or an up-and-down staircase method, can provide numerical failure thresholds.
| 🟦 Parameter | 📐 Value | 🎯 Tolerance |
|---|---|---|
| Mass | 680 g (1.5 lb) | ±15 g (±0.03 lb) |
| Diameter | 32 mm (1.25 in) | ±2 mm (±0.1 in) |
| Length | 115 mm (4.5 in) | — |
| End Geometry | Full radius hemisphere | — |
📊 Key Measured Properties and Energy Dissipation
The primary measured property is the energy dissipated during the concentrated impact, which indicates the packaging’s protective capability. The test yields a pass/fail determination based on acceptance criteria defining package and content condition. Reference is made to Practice D4169 for performance testing and Practice E122 for sample size estimation.
💡 Tip: Ensure the impact mass is released without rotation and the drop height is accurately controlled for consistent results. Verify that the guidance system maintains a vertical trajectory as specified in the standard apparatus.
❓ Frequently Asked Questions
🔍 What types of packages are most suitable for this test?
Thin-fluted corrugated boxes and stretch-wrapped packaging are typical, as they are more susceptible to concentrated low-level impacts encountered in distribution environments.
💡 How is the drop height selected?
The drop height is prescribed based on the expected distribution environment or specific acceptance criteria. Modified procedures can use incremental height increases or staircase methods for numerical response.
⚡ Why use a hemispherical end on the impactor?
The hemispherical end focuses the impact force onto a small area, realistically simulating concentrated impacts from adjacent freight, handling equipment, or conveyor sorting.
📌 What does the energy dissipation value represent?
The energy dissipated reflects the package’s ability to absorb impact energy. It is recorded along with the pass/fail result to evaluate the packaging’s protective performance and ensure adequate clearance or support between the wall and contents.