PP (5): Difference between revisions

[[PP (5)]] can function as both a [[plastic]] and fibre type of thermoplastic. This allows for a vastly increased range of uses. It can be used as a fibre, such as in the manufacture of promotional tote bags and ‘bag for life’ shopping carriers. It is soft, malleable and has a relatively low melting point, making it very easy to be used in the injection moulding process, where it is supplied in pellets. It flows well too, due to its low melt viscosity<ref name="ADR" />. [[PP (5)]] can even withstand twisting motions of up to 360° without snapping and is very hard to snap as a result. High chemical and fatigue resistance adds to its durability and versality as a packaging material and thus it makes a good option for hinges and bottle tops attached to the main bottle by a thin layer of plastic<ref name="ADR" />.

Its one main disadvantage is that [[PP (5)]] is not conducive to being easily recycled. When it burns, it produces a chemical change that cannot be reversed<ref name="ADR" />.Re-heating polypropylene that has already been melted and formed results in it burining rather than being liquifies for a second time, thus other [[recycling]] or re-conditioning methods must be considered, at a significantly higher cost<ref name="ADR" />.