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Polypropylene (PP) Granule
Polypropylene is used in the automotive industry, plastic case production, construction industry (insulation, crochet, spacers, conical feet, etc.), buckets, flower pots, tables, chairs, and various plastic toy industries. Polypropylene obtained by polymerizing the monomer propylene is extremely resistant to chemical solvents (acids and bases). Below you can see polypropylene products in various colors.
Chemical and physical properties: The crystal structure of the most common commercial polypropylene is somewhere between low density polyethylene (LDPE) and high density polyethylene (HDPE). Young's modulus (modulus of elasticity) is also at medium level. However, it is less rigid than LDPE and much less brittle than HDPE. This allows polypropylene to be used in place of engineering plastics such as ABS.
Polypropylene resists fatigue very well. They are low fluctuations and have good impact resistance. It has a low friction structure and provides very good electrical insulation.
Chemical resistance is good. It is suitable for all thermoplastic processing processes. The melting temperature of polypropylene is around 160 degrees Celsius.
However, it has the following disadvantages. UV radiation is reduced, and it shows high thermal expansion. It is difficult to paint and coat. Compliance with external weather conditions is reduced and protection against oxidation is provided. It is flammable and interacts with solvents containing chlorine.
These types of materials are produced using methods such as detergent box covers and margarine containers. Back synthetic carpet bases, various plastic toys, stationery, and similar products can be produced.
PE(elteks) Polyethylene
Polyethylene is a thermoplastic used in a wide variety of products. It takes its name from the monomer ethylene, polyethylene is produced using ethylene. In the plastics industry, its name is generally used as PE for short. The ethylene molecule C2H4 actually consists of two CH2s linked by a double bond. (CH2=CH2) Polyethylene is produced by the polymerization of ethylene. The polymerization method can be radical polymerization, anionic polymerization, ion coordination polymerization,granules and cationic polymerization methods. Each of these methods produces different types of polyethylene.
Classification of polyethylene
Polyethylene is classified in various categories based on its density and chemical properties. Its mechanical properties depend on its molecular weight, crystal structure and branching type.
UHMWPE (ultra high molecular weight PE)
HDPE (high density PE) (high density PE)
HDXLPE (high density cross-linked PE)
PEX (cross-linked PE) (cross-linked PE)
MDPE (medium density PE)
LDPE (low density PE)
LLDPE (linear low density PE)
VLDPE (very low density PE)
Polyamide(PA)
Polyamide is a polymer containing monomers linked by amide bonds. Natural and synthetic samples are available. The most common, naturally occurring examples are polypeptides and proteins, such as silk and wool. Examples of artificial, synthetic polyamides (nylon, kevlar, sodium (poly)aspertate) can be given.
Kevlar building chain
Synthetic polyamides are widely used in the textile, automotive industry, kitchenware and sportswear due to their durability.
PET - HDPE
Collection: Collected together with other recyclables and transported to a recycling facility, either in a “single stream” or as a special plastic stream.
Separation: At the Recycling Facility, plastics are separated from other recyclables through a series of "filters" (infrared sensors, human separators, magnets, and screens of different sizes).
Baling: PET (#1) and HDPE (#2) are collected separately as they are the most valuable and most easily identifiable products. These fractions are compressed into cubes and sold to reprocessors.
Cleaning and shredding: PETs and HDPEs are washed and shredded into flakes to remove food residue and labels. The flakes are separated from each other using density (PET Settled, HDPE Floated) and sold to another reprocessor.
PET flake can be used to make new bottles or clothing fibers. HDPE, on the other hand, can be turned into non-food products such as bins, composite decking or other products. Other fractions are increasingly finding use in special applications. In industry, recycled resin is often added to virgin (non-recycled) resin to make products.
