Testing Products for ASTM D638
APP-D638Measures the force required to pull a plastic specimen to its breaking point. This test provides data on tensile strength, elongation, and modulus of elasticity, essential for evaluating the structural integrity of unreinforced and reinforced plastics. This configuration focuses on the Newton-Series control architecture to ensure high-fidelity data acquisition. Utilizing a 32-bit digital signal processor, the system provides a superior Signal-to-Noise Ratio (SNR), which is essential for capturing precise material transitions that lower-resolution systems often miss.
The load frame for this application has been selected to provide the most cost-effective solution capable of meeting the standard’s peak force requirements. While TestResources offers a wide range of frame geometries, this specific selection represents the optimal balance between laboratory CAPEX and technical compliance. Any frame in our catalog meeting the minimum load rating will adhere to the standard; however, this configuration is our primary recommendation for those seeking a reliable, streamlined testing platform without unnecessary complexity.
Viscoelasticity: Plastics change properties based on speed.
Use Pneumatic Grips to provide constant clamping force even as the sample thins out.
Regulatory & Test Details
| App Id | APP-D638 |
|---|---|
| App Standard | ASTM D638 |
| Industry Type | Consumer, Industrial, Medical |
| Min Force Kn | 2 |
| Max Force Kn | 25 |
| Max Spd Mm/m | 500 |
| Expert Spd | Use 5mm for Modulus, 50mm for Strength. |
| Pointer App Software | N-ASTM-D638 |
| Pointer Fixture Family | G-ASTM-D638 |
| Pointer Strain Family | E-ASTM-D638 |
Implementation Commentary
Pulling faster makes them appear stiffer and stronger; speed control is vital.
Common Pitfalls
Slippage in manual grips; ignoring thermal expansion in the lab.