PP (polypropylene) is the second most frequently used material in Europe. Its share in consumption of plastic materials ranges about 20 %. Polypropylene is By its features and use, polypropylene is similar to polyethylene, therefore both of these polymers are classified in the same group indicated as polyolefins. Unlike PE, PP however features higher strength and consistency, and since its melting temperature is higher, it shows good temperature stability. PP consistency imparts good dimensional stability to products.
Polypropylene can be found almost anywhere: in packaging materials, household appliances, clothing, means of transport, and many other products. More than half of the world PP production is used for packages. It is also used in technical applications.
It is used among others in the production of:
- Packages – flexible foils, pots for dairy products and beverage machines, moulded trays, package caps, bottle caps, bags, notebook covers.
- Textile – fibres (thermal underwear, carpets), strings, ropes, binding strips.
- Pipes – tubes of various diameters for water and other liquids.
- Automotive parts – bumpers, tanks, cable sheathing.
- Consumer goods – ball-point pens, measuring jugs, trays, small items including promotional.
- PP is used also in the production of plastic currency.

HDPE, or high-density polyethylene, is under ordinary circumstances a material of milky colour that differs from other polyethylene types by higher strength and ductility. Since the material is more consistent, the foils and packages produced from it are stronger. The HDPE bag thus has a higher load capacity than a LDPE bag of identical thickness. This is beneficial in the production of very thin bags; HDPE bag thickness is from 7 micrometers.In addition to flexible packages, HDPE is also a very suitable material for strong packages. Best-known allocations are cosmetic bottles (detergents, shampoos), and cans.
HDPE is used also in technical applications, e.g. as septic tanks, in the production of pipes, and for sheathing of cables and harnesses. Septic tanks may have very complicated shapes and large capacities. The advantage of HDPE in these applications is its natural strength and consistency.

LDPE is a polyethylene with lower density. It is the most frequently used material in the production of foils, in particular for packaging. All simple types of disposable bags, garbage bags, and shopping bags are made just from LDPE. The reason is particularly its low price and easy processing ability.
Foils are manufactured by extrusion, either as 2D foils or hoses (tubular extrusion). Foils can be made as very thin (bags for baked goods) or thick-walled (large bags). Package thickness may be adapted to application requirements from 30 micrometers (0.030 mm) up to 200 micrometers.
Should the final package be resistant against perforation, PE foils may be laminated with another foil type improving features of the final package. For example, lamination with PET foil (polyethylene-terephthalate) is used in the production of foodstuff bags for pets. Lamination with a paperboard is applied in the production of juice packages (Tetrapack type).
The benefit of LDPE is that it can be imprinted very well. Shopping bags and large bags can be decorated with multi-colour print. This material can also be welded to achieve various shapes of pouches and bags. Recycled PE may be returned back for the production of pouches and bags, which saves the environment.

RPP - polypropylen recyclate

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