When considering the mechanical properties of plastic pipes, impact resistance is a key factor. Generally, PVC has a lower impact resistance compared to Polyolefins (PO) like PE and PP.
Testing and Factors
The common method for testing impact resistance in plastic pipes is via a falling weight test, not methods like the Charpy test. Several aspects are critical during testing, including temperature (ambient, freezing point, or -20°C), the weight of the falling tup, and its radius. Lower test temperatures bring the material closer to a ductile-to-brittle failure transition, significantly reducing its ability to absorb energy. The processing quality, specifically achieving an optimal network of tie-molecules, is essential for maximizing impact values. ABS material offers higher impact resistance and is used in cold climates for this reason.
Applications
Higher impact resistance is beneficial in cold climates or applications where external impacts are a concern.
FAQ Section
How is impact resistance for plastic pipes typically tested?
Impact resistance is commonly tested using a falling weight method.
Besides temperature, what else influences the impact resistance of a plastic pipe?
The quality of polymer processing, specifically the formation of a strong network of tie-molecules, significantly affects impact values.
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Humberto Goldoni
