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laura baker
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How does TPU compare to other thermoplastics in regards to impact strength? How does the impact strength of PU vary depending on its form?
Impact strength is the ability of a material to withstand sudden impact or force without breaking or deforming. It is an important property to consider when choosing materials for applications that may experience impact or shock.
Impact strength is typically measured using a pendulum impact test, where a swinging pendulum hits a notched sample of the material and the energy absorbed by the sample is measured. The higher the energy absorbed, the greater the impact strength of the material.
Some common thermoplastics and their impact strengths include polycarbonate (900 J/m), nylon (600-700 J/m), and ABS (300-400 J/m). However, the impact strength can vary depending on the specific grade and processing conditions of the material.
In general, lower temperatures can decrease the impact strength of thermoplastics, as they become more brittle and prone to cracking under impact. However, some materials, such as PVC, may have improved impact strength at lower temperatures due to increased stiffness.
The impact strength of thermoplastics can be influenced by various factors, including the material's molecular structure, processing conditions, and environmental conditions (such as temperature and humidity). The presence of additives, fillers, or reinforcements can also affect impact strength.