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D6295 – Standard Test Method Technical Guide
ASTM D6295/D6295M defines a precise method for measuring the force and elongation required to dispense light-duty pressure-sensitive film tape from a standard desktop dispenser. This test method generates critical performance data for quality assurance programs and product specifications for office and stationery tapes on a 1-inch core.
📐 Apparatus Configuration and Standard Blade Setup
The core apparatus is a Constant-Rate-of-Extension (CRE) tension tester. The load cell must be configured so the maximum dispensing force does not exceed 90% of its normal capacity. A stressing clamp moves at a uniform rate of 250 mm/min or 10 in./min. The data acquisition system must sample at a minimum of 100 data points per second to accurately capture the severing event.
| 🟦 Parameter | 📐 Specification |
|---|---|
| Tester Type | Constant-Rate-of-Extension (CRE) |
| Load Cell Capacity | Max force ≤ 90% of normal limit |
| Stressing Rate | 250 mm/min (10 in./min) |
| Sampling Rate | ≥ 100 data points/sec |
| Display | Graphical display required |
💡 Blade Compliance: The specific blade geometry is a critical variable. The blade mounted on the tester must match the cutter design referenced in the standard, as deviations in sharpness directly alter the measured force.
⚙️ Test Procedure and Conditioning Protocols
Test specimens must be conditioned per Practice D4332. The tape roll is mounted on a mandrel, and the free end attached to the stressing clamp. As the clamp pulls the tape across the blade, the test records the force and elongation until the tape is fully severed.
⚠️ Applicability: This method is best suited for backings typical of CID A-A-113 (e.g., acetate, cellophane). Tapes with heavy-duty backings may not dispense cleanly under these specific test conditions.
The primary recorded parameters are the peak dispensing force and elongation at dispense. Values are reported in SI (N) or inch-pound (lbf) units, but must be used independently as they are not exact equivalents.
📊 Measured Properties and Quality Assurance
The results allow objective comparison of tape products and manufacturing lots. The sample size is governed by Practice E122. Key properties include:
| 🎯 Key Property | ⚡ Interpretation |
|---|