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Thermoplastic elastomer (TPE)
2-20 usd/kg
Thermoplastic elastomer (TPE) are rubber-like plastics, that can be converted by injection moulding, extrusion, laminating and welding. This makes them very versatile. Their properties range from very soft and stretchy to almost rigid. They are based on thermoplastic chemistry, which provides the moulding and forming characteristics, with a combination of soft and rigid segments. In some cases, the thermoplastic may be mixed or alloyed with a cross-linked (thermoset) rubber, which provides added toughness and mechanical performance. The characteristics of the material are governed by the ingredients, proportion of soft and rigid segments, and polymer structure (semi-crystalline or amorphous). As a result, there are many options available and the price varies a lot. Applications range from textiles (think spandex) to footwear, and medical equipment to structural automotive parts. In many cases, they offer a potentially recyclable alternative to conventional rubber, which is cured in a one-way reaction.
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Sustainability concerns
Non-renewable ingredients
Raw material generates polluting by-products
Low circularity potential
Microplastics
PP based thermoplastic elastomer (TPE), known as thermoplastic polyolefin (TPO), consist of relatively hard segments of PP (or polyethylene) blended with softer segments of ethylene propylene diene monomer (EPDM) rubber. They are low cost thermoplastic elastomers (TPE) with high impact resistance, low density and good resistance to chemicals. Processed by conventional moulding processes, such as injection, extrusion and blow moulding, they are used in applications that require higher toughness, durability and flexibility compared to regular PP copolymers. Examples includes automotive bumpers and dashboards, films, seals and roofing. They provide an alternative to polyvinyl chloride (PVC) foils in many cases, such as automotive interiors and construction.
Mineral fillers are added to increase stiffness, dimensional stability and high-temperature performance. With the right filler type and content, a good balance of stiffness and impact resistance is possible. Unlike regular PP, they retain ductile behaviour below 0 degC. UV stabilisers are added to enhance weather resistance. Adhesion promoter is included in parts that will be painted or adhesive bonded, such as for automotive applications.
