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D5267-97 – Standard Test Method Technical Guide
ASTM D5267 – 97 (Reapproved 2017) describes a precise methodology for quantifying the force required to extrude an adhesive from a cartridge under controlled temperature conditions. This standard specifically addresses the application challenges posed by cold temperatures at job sites, where extrudability becomes a limiting factor. Values are reported in inch-pound units, with SI equivalents provided for reference.
📐 Test Fixture and Specimen Preparation
The standard mandates a specific test fixture constructed from an aluminum framework with a steel rod and plunger combination, designed to be mounted on a universal test machine capable of measuring compressive strength. Prior to testing, the filled cartridge must be conditioned to reach a uniform, desired constant temperature throughout the adhesive volume.
Specimen preparation is critical for reproducibility. The tip of the cartridge is cut off perpendicularly to ensure a precise inside diameter of ¼ in. (6.3 mm). If a foil or plastic liner is present, it must be completely punctured to permit unobstructed material flow. The adhesive temperature is recorded using a thermometer or thermocouple inserted directly into the cartridge before testing begins.
| 🟦 Parameter | 📏 Specification |
|---|---|
| Fixture Frame Material | Aluminum |
| Plunger and Rod Material | Steel |
| Tip Orifice Inner Diameter | ¼ in. (6.3 mm) |
| Crosshead Speed | 5.0 in./min (127.0 mm/min) |
💡 Key Consideration: Rigorous conditioning to the target constant temperature is essential. The viscosity of cartridge adhesives is highly sensitive to temperature, directly impacting the measured extrusion force and the reproducibility of the test results.
⚙️ Standard Test Procedure
After mounting the test fixture and conditioning the specimen, the crosshead speed is set to 5.0 inches per minute (127.0 mm/min). The machine is then activated to begin extrusion. The standard requires the measurement of two distinct force values to characterize the extrudability of the adhesive completely.
| 🎯 Measured Value | ⚡ Description |
|---|---|
| Break-Loose Force | The maximum force required to initiate extrusion, representing the force needed to release the plunger from the cartridge. |
| Continuous Extrusion Force | The force required to maintain a steady, continuous flow of the adhesive from the cartridge orifice. |
⚠️ Critical Step: Ensure the cartridge tip is cut perpendicularly to its axis to achieve the exact ¼ in. (6.3 mm) inside diameter. An angled cut alters the effective orifice geometry and will invalidate the force measurements recorded during the test.
📊 Significance and Quality Control Applications
By quantitatively measuring the force necessary for extrusion, this test method provides formulators with objective data for product development, particularly regarding performance at cold temperatures. For end users, the results aid in selecting an appropriate product for specific job site conditions and application equipment. Crucially, the test method also evaluates the ease of extrusion as a quality control tool; changes in break-loose or continuous extrusion force over time can indicate shifts in shelf-life stability and internal structure development of the adhesive.
❓ Frequently Asked Questions
🔍 What is the overarching purpose of ASTM D5267?
It provides a standardized method to quantitatively measure the force required to extrude an adhesive from a cartridge at a specified temperature, aiding formulation development, end-user product selection, and quality control.
💡 What specific crosshead speed is required by the standard?
The standard specifies a crosshead speed of 5.0 in. (127.0 mm) per minute for the extrusion process.
⚡ How is the cartridge orifice prepared for testing?
The tip is cut off perpendicularly to achieve an exact inside diameter of ¼ in. (6.3 mm). Any internal liner must be completely punctured to avoid obstructing the adhesive flow.
📌 Which two distinct force measurements are recorded during the test?
The test measures the break-loose force (peak force to initiate flow and release the plunger) and the continuous extrusion force (force required to maintain steady flow).