Guys,

Any expert here can tell me what is the different between these 2? which 1 is suppose to be a better material?
some told me OEM part for european car like BMW and Audi uses PU, but then some told me PP is a better choices?

Thanks heap!

OEM uses ABS iinm ..

Dont know whether it is true or not. PP is better than PU in terms of durability and not that easy to break.

I'm taking structures and properties and materials this semester and coincidentally polymers are in my studies.

Polypropylene (PP) - good resistance to fatigue, tough and flexible (ductile), high melting temperature (can be exposed to greater temperature and retaining its shape) and good impact resistance.

Polyurethane (PU) - higher impact resistance than plastic, brittle (not that flexible) and excellent abrasion and tear resistance.

So the best material would be PP as it is ductile. When a material is ductile, it has higher toughness (able to last long).

PU on the other hand is brittle and hard. An example of brittle and hard material would be glass. What happens when you knock a common glass? It shatters.

Hope it helps.

It helps a lot by the way. Thanks!

I think OEM bumber is PP.

PP better than PU

thanks guys.. this help a lot./.