Polystyrene PS
Polystyrene is easy to process, has a nice gloss and it is still the most preferred material for thermoforming. The most well-known polystyrene application is yoghurt cups.
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More About PS
There are 3 main categories of Polystyrene, namely: GPPS (General Purpose Polystyrene), HIPS (High Impact Polystyrene), and EPS (Expanded Polystyrene).
GPPS General Purpose Polystyrene
GPPS comes in all shapes, and sizes – thus careful attention should be paid to the type of material it is. The images provide a better example of some items that are GPPS.
HIPS High Impact Polystyrene
High impact Polystyrene, which has butadiene rubber as impact modifier, giving the material good impact performance, but losing its transparency. Yogurt cups fall into this category.
EPS Expanded Polystyrene
EPS is an extremely lightweight material which is not surprising considering that it comprises of 95% of air. This characteristic makes it ideal for use in packaging as it does not significantly add to the weight of the total product – thereby reducing transportation costs.
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