Types of Plastic

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1) PP (Polypropylene)

An Overview of Polypropylene Recycling. New technologies promise to help boost recycling rate.

Polypropylene, abbreviated as PP, is a recyclable thermoplastic polymer widely used in many different products. PP is rugged and resistant to different chemical solvents, acids, and bases. PP’s resin identification code is 5, and it is recyclable. The current global PP market was valued at more than $80 billion in 2014, according to Transparency Market research, and is anticipated to reach $133.3 billion by 2023.


2) PE (Polyethylene)

Recycling of High-Density Polyethylene (HDPE or PEHD)

Introduction to HDPE

High-Density Polyethylene, usually shortened to HDPE or PEHD, is a plastic polymer with flexible properties which make it ideal for a wide range of applications.

High-density polyethylene, as the name suggests, has a higher specific density than low-density polyethylene, though this difference is only marginal. What really makes the difference in the physical properties of HDPE is the lack of branching, meaning it is light with a high tensile strength. Because there is no branching the structure is more closely packed, make HDPE a linear polymer. The branching can be controlled and reduced by using specific catalysts during production.


3) TPO (Thermoplastic Polyolefin)

A polyolefin is any of a class of polymers produced from a simple olefin (also called an alkene with the general formula CnH2n) as a monomer. For example, polyethylene (PE) is the polyolefin produced by polymerizing the olefin ethylene. Polypropylene (PP) is another common polyolefin which is made from the olefin propylene. from Wikipedia

Polyolefins are the most widely used plastics in the world for many reasons. They are clean materials to manufacture and process and easy to reuse and recycle, producing no harmful gases or unpleasant odours when melted.


4) TEO (Olefinic Thermoplastic Elastomer)

Thermoplastic olefinic elastomers (TPOs) consist of PP, PE or other polyolefin as hard segments and rubber component such as ethylene propylene rubber (EPM, EPDM) as soft segments. TPOs can be classified broadly into three types: blended type, made of polyolefin and rubber components; dynamically cross-linked type (also known as thermoplastic vulcanizates, TPV); and polymerized type (Reactor-TPO, R-TPO).

Mitsubishi Chemical Corporation’s TPOs Thermorun™ and Trexprene™ are examples of the first two types. They come in a wide variety of grades, with the blended type (medium to high hardness series) and dynamically cross-linked type (low hardness series) each available as products from semi-hard to flexible. The dynamically cross-linked type, in addition to the 3000 Series featuring superior elastic recovery under compressive deformation and extrusion appearance, includes the QT Series with the performance required for various automotive parts. The morphology of the dynamically cross-linked type is shown in Figure 1. A polymerized type, the Zelas™ series, has also been marketed but a detailed description is omitted here.


5) TPE (Thermoplastic Elastomer)

Thermoplastic Elastomers are generally low modulus, flexible materials that can be stretched repeatedly to at least twice their original length at room temperature with an ability to return to their approximate original length when stress is released. The grandfather materials with this property are thermoset rubbers, but many families of injection-moldable thermoplastic elastomers (TPEs) are replacing traditional rubbers. In addition to use in their basic form, TPEs are widely used to modify the properties of rigid thermoplastics, usually improving impact strength. This is quite common for sheet goods and general molding TPEs.