Ethan Clarke
Thermoplastic elastomers (TPEs) are a type of plastic with a soft, rubbery feel. They are used in a wide range of applications, from household objects like toothbrush handles and cellphone cases to automotive parts and medical products. TPEs are often chosen over rubber due to their flexibility, versatility, and recyclability. They can be molded, extruded, and reused, and have a high melting point. While it can be challenging to distinguish TPEs from other materials like silicone or rubber by appearance and feel alone, TPEs stand out for their ability to be reprocessed by heat. This means that during manufacturing, any scrap material can be easily reused, and products can be heated and reshaped if adjustments are needed.
| Characteristics | Values |
|---|---|
| Composition | A mix of polymers, usually a plastic and a rubber |
| Tensile Range | 500-2500 PSI |
| Recyclability | Recyclable, but can be blended with non-recyclable materials |
| Manufacturing | Injection moulding, extrusion |
| Heat Resistance | Good heat resistance, but lower than silicone |
| Melting Point | High melting point |
| Stretchiness | Can be stretched to twice their original length and return to their original shape |
| Weight | Lightweight |
| Floatability | Floats |
| Flexibility | Soft and flexible |
| Reusability | Can be reprocessed by heat |
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What You'll Learn
Float and burn tests
The float test and burn test are two long-used methods to help identify plastics. While they are useful for ruling out certain plastics, they are not always conclusive in identifying a specific type of plastic.
Float Test
The float test involves checking the density of the plastic against reference liquids with known densities. If the plastic is less dense than the liquid, it will float; if it is more dense, it will sink. For example, polyethylenes and polypropylenes float in water (density = 1 g/mL), while most other plastics sink.
Burn Test
The burn test correlates a plastic sample's composition with a set of observable properties when burned. It should be performed in an industrial setting with the correct equipment, as some burning plastics release carcinogens and can drip molten plastic. The observable properties include:
- The smell produced by the burning plastic (e.g. burnt wool for nylon)
- The colour of the flame (e.g. blue with a yellow tip for nylon)
- Whether the plastic continues to burn after the flame source is removed (e.g. nylon does not)
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Recyclability
Thermoplastic elastomers (TPEs) are a type of plastic refined to create a soft, rubbery feel. They are commonly found in household objects, such as toothbrush handles, sippy cup lids, and cellphone cases. TPEs are often chosen over rubber due to their flexibility, versatility, and recyclability.
TPEs are recyclable under Plastic Recycling Code 7. They can be moulded, extruded, and reused like plastics, but they also possess the elastic properties of rubbers, which are typically not recyclable due to their thermosetting characteristics. TPEs can be ground up and turned into 3D printing filament, and they can also be made from biopolymers produced by living organisms, such as sugar cane.
TPEs are a more eco-conscious option than thermoset materials like rubber or silicone. Thermoplastics, by definition, can be reprocessed by heat and reused, whereas thermoset materials, once moulded, cannot be broken down and remoulded. During the manufacturing process, any scrap TPE material can be reused, and products can be adjusted by simply heating and reshaping them, creating no waste.
TPEs are also used to make products more lightweight, which has fuel efficiency benefits for the automotive industry. They can replace glass or other heavier materials, reducing the number of delivery trucks needed on the road. Additionally, TPEs are used in the heating, ventilation, and air conditioning (HVAC) industry due to their functionality, cost-effectiveness, and adaptability.
In conclusion, TPEs offer a range of benefits, including recyclability, lightweight properties, and flexibility, making them a popular choice for various industries, including automotive and HVAC. Their ability to be reprocessed by heat and reused makes them a more environmentally friendly option compared to traditional thermoset materials.
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Elasticity and stretch
Thermoplastic elastomers (TPEs) are a type of plastic that has been refined to create a soft, rubbery feel. They are a mix of polymers, usually a plastic and a rubber, that consist of materials with both thermoplastic and elastomeric properties. TPEs are used in a variety of applications, from household objects like toothbrush handles and cellphone cases to automotive parts and medical products.
One of the key characteristics of TPEs is their elasticity and stretchability. TPEs can be stretched to moderate elongations and, upon the removal of stress, return to their original shape. This gives them a longer life and a better physical range than other materials. The ability to stretch and return to their original shape is one of the defining characteristics of TPEs, setting them apart from thermoset materials like rubber or silicone, which cannot be remoulded once set.
The elasticity and stretchability of TPEs can be fine-tuned by blending them with other materials to create new types of TPEs, such as TPVs and TPUs. These blends can be tailored to specific applications, with unique properties such as stretchability, hardness, or softness. The elasticity of TPEs can also be modified by varying the composition of the polymers during manufacturing.
The tensile properties of TPEs are commonly measured to describe their performance when stretched. Various tests are used to indicate how a TPE will perform in end-use environments, such as tensile at break (ultimate tensile) and tear strength. These tests measure the amount of force needed to break or tear the material, typically given in pounds per square inch (psi) or megaPascals (MPa). Another test, the tensile modulus, measures the resistance to stretching over a range of elongation points, often reported as tensile at various percentages of the original length.
The elasticity and stretch of TPEs offer several advantages. For example, TPEs used in snowmobile tracks provide stiffness and abrasion resistance. TPEs are also used in medical products like catheters, where their softness and stretchability offer a range of comfort and flexibility ideal for patients.
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Manufacturing processes
Thermoplastic elastomers (TPEs) are a class of copolymers or a physical mix of polymers, usually a plastic and a rubber, that combines the characteristics of both thermoplastics and elastomers. TPEs are versatile materials that exhibit a unique combination of thermoplastic and elastomeric properties, providing the benefits of both plastics and rubber-like materials.
TPEs are manufactured through various processes, including:
- Blending different polymers like elastomers (EPDM, NBR) with thermoplastics.
- Synthesising block copolymers with alternating rigid and soft segments.
- Dynamic vulcanisation of elastomer and thermoplastic blends.
- Injection moulding, which is one of the two most important manufacturing methods for TPEs.
- Extrusion, the other most important manufacturing method.
- Blow moulding.
- 3D printing, using technologies such as selective laser sintering (SLS) and fused deposition modelling (FDM).
- Compression moulding, although this is seldom used.
TPEs can be easily processed using conventional plastic processing techniques and do not require vulcanisation or curing, simplifying the manufacturing process. They can be heated and reshaped multiple times, allowing for easy processing and reprocessing, and making them ideal for prototyping. TPEs can also be made from biopolymers and post-consumer recycling, such as ocean plastic, contributing to sustainable manufacturing practices.
The manufacturing process for TPEs is very controlled and precise, allowing for the creation of products with different levels of risk and grades, such as medical equipment. TPEs can be customised to exhibit specific properties such as processability, flexibility, and durability, and they can be manufactured in a variety of colours.
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Common use cases
Thermoplastic elastomers (TPEs) are a type of plastic refined to create a soft, rubbery feel. They are used in a wide range of applications, from household objects to automotive parts and medical products.
TPEs are ideal for products that require a soft grip, such as the handle of a toothbrush or a cellphone case. They are also commonly used in sealing applications, such as gaskets, O-rings, and bottle cap liners. TPEs are well-suited for these applications due to their flexibility, soft touch, and ability to be stretched and returned to their original shape.
In the automotive industry, TPEs are used to make suspension bushings, wire and cable insulation, and other parts. They are valued for their lightweight and fuel efficiency, as well as their resistance to deformation. TPEs are also used in heating, ventilation, and air conditioning (HVAC) systems, where they offer function, cost-effectiveness, and adaptability.
TPEs are often chosen over other materials like rubber or silicone due to their flexibility, versatility, and recyclability. They can be heated, reshaped, and reused, making them a more eco-conscious option. Additionally, TPEs can be made from biopolymers derived from natural resources, further enhancing their sustainability.
When deciding between TPE and other materials, it's essential to consider the specific requirements of the application. TPEs offer excellent elasticity, a high melting point, and good chemical resistance, stability, and heat resistance. However, if extreme heat resistance is a priority, other materials like silicone may be more suitable.
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Frequently asked questions
Thermoplastic elastomers (TPEs) are a type of plastic that has been refined to create a soft, rubbery feel. They are made from a mix of polymers, usually a plastic and a rubber.
TPEs are soft and flexible and can be stretched to twice their original length at room temperature. They return to their original shape when stress is removed.
It can be difficult to identify TPE from silicone or rubber by look and feel alone. TPEs are often chosen over rubber due to their flexibility, versatility, and recyclability. A float test or burn test can help rule out other plastics but may not be able to specifically identify TPE.
TPEs are used in a wide range of applications, from household objects like toothbrush grips and cellphone cases to automotive parts and medical products. They are also used for wire and cable insulation, HVACs, and home appliances.
