Sofia Martinez
Thermoplastic olefin (TPO), also known as thermoplastic polyolefin or olefinic thermoplastic elastomers, is a polymer/filler blend consisting of a fraction of thermoplastic, an elastomer or rubber, and a filler. TPO is widely used in the automotive industry due to its durability, impact strength, and temperature resistance. It is also UV-stabilized, making it suitable for outdoor applications such as roofing. TPO compounds can be formulated to enhance specific properties, such as UV weathering and scratch resistance, and are processed through techniques like injection molding and extrusion.
| Characteristics | Values |
|---|---|
| Composition | Polymer/filler blends consisting of thermoplastics, elastomers or rubber, and fillers |
| Thermoplastics | Polypropylene (PP), Polyethylene (PE), Block Copolymer Polypropylene (BCPP) |
| Fillers | Talc, Fiberglass, Carbon Fiber, Wollastonite, MOS (Metal Oxy Sulfate) |
| Elastomers | Ethylene Propylene Rubber (EPR), EPDM (EP-diene rubber), Ethylene-Octene (EO), Ethylbenzene (EB), Styrene Ethylene Butadiene Styrene (SEBS) |
| Processing | Injection moulding, extrusion, blow moulding, thermoforming |
| Weathering | UV-stabilized, resistant to solar UV radiation |
| Impact Strength | High impact resistance |
| Stiffness | Customizable stiffness and impact resistance |
| Temperature Resistance | Designed for optimum balance of cold temperature impact and low thermal expansion |
| Weight | Lightweight |
| Chemical Resistance | Good chemical resistance, especially to acids, bases, and ozone |
| Durability | High durability, toughness, and weatherability |
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What You'll Learn
TPO composition
Thermoplastic olefin (TPO) is a blend of polymer and filler materials, while most other thermoplastics are made from a single polymer. The components of TPO are blended together at temperatures between 210°C and 270°C under high shear. Common polymers used in TPO include polypropylene (PP) and polyethylene (PE), while common fillers include talc, fiberglass, carbon fibre, wollastonite, and MOS (Metal Oxy Sulfate). The specific density of TPO blends ranges from 0.92 to 1.1.
If PP and PE are the dominant components of a TPO blend, the rubber fraction will be dispersed into a continuous matrix of "crystalline" polypropylene. The rubber fraction of a typical TPO blend is usually un-crosslinked ethylene-propylene rubber (EPR) or EPDM (EP-diene rubber). If the fraction of rubber is greater than 40%, phase inversion may be possible when the blend cools, resulting in an amorphous continuous phase and a crystalline dispersed phase. This type of material is non-rigid and is sometimes called TPR (ThermoPlastic Rubber).
To increase the rigidity of a TPO blend, fillers that exploit surface tension phenomena are used. By selecting a filler with a higher surface area per weight, a higher flexural modulus can be achieved. TPO compounds are characterised by high impact resistance, low density, and good chemical resistance. They are used in applications where there is a requirement for increased toughness and durability over conventional PP copolymers, such as automotive bumpers and dashboards.
The properties of TPO are restricted to the high end of the hardness scale, typically >80 Shore A, with limited elastomeric properties. TPOs can be easily processed by injection moulding, profile extrusion, blow moulding, or thermoforming. TPO is also used in the manufacturing of medical devices, sporting goods, footwear, and consumer products.
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TPO applications
Thermoplastic olefin (TPO), also known as thermoplastic polyolefin, is a polymer/filler blend that combines thermoplastics, elastomers or rubber, and fillers. It is used in applications that require durability and weatherability, such as in the automotive and industrial markets.
TPO is widely used in the automotive industry to replace traditional materials such as metal. It is used in both exterior and interior automotive applications, including bumpers and dashboards. The use of TPO in automobiles helps to reduce weight while maintaining aesthetic appeal. Additionally, TPO is UV-stabilized, protecting it from degradation due to UV light exposure, making it ideal for outdoor parts.
The durability of TPO is a key advantage, providing optimum balance between stiffness and low thermal expansion. This prevents issues such as cracking or deformation due to temperature changes. TPO also exhibits high impact resistance and good chemical resistance.
In the industrial market, TPO is used in applications where durability and weatherability are crucial. It maintains its shape and dimensional stability even when exposed to varying temperatures, ensuring limited thermal expansion or contraction.
TPO can be easily processed through techniques such as injection moulding, profile extrusion, blow moulding, and thermoforming. This versatility allows for the creation of various parts and components with enhanced durability and aesthetics.
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TPO processing
Thermoplastic olefin, also known as thermoplastic polyolefin (TPO), is a polymer/filler blend that usually consists of some fraction of a thermoplastic (generally block copolymer polypropylene), an elastomer or rubber, and a filler such as talc or calcium carbonate. TPO compounds are resin blends of polypropylene (PP) and un-crosslinked ethylene propylene diene monomer (EPDM) rubber and polyethylene.
TPO is widely used in the automotive and industrial markets due to its durability and weatherability. It is ideal for applications where exposure to heat and cold is common, as it keeps its shape while allowing for limited thermal expansion or contraction. TPO is also UV-stabilized, making it suitable for outdoor parts and roofing applications.
The processing of TPO involves blending the components at temperatures between 210-270 °C under high shear. A twin-screw extruder or a continuous mixer can be used to achieve a continuous stream, while a Banbury compounder is employed for batch production. The batch process allows for a higher degree of mixing and dispersion, but it adds an extra cost step as the superheat batch must be immediately processed through an extruder to be pelletized.
The properties of a TPO product depend on controlling the size and distribution of the microstructure. The geometry of the metallocene catalyst will determine characteristics such as average block length, molecular weight, and distribution, which in turn govern the microstructure of the blend.
TPO can be easily processed by injection moulding, profile extrusion, thermoforming, or blow moulding. During installation, the TPO membrane is attached to the cover board with a bonding adhesive or mechanically fastened. For roofing applications, a contractor uses a hot-air gun to weld the seams together after rolling out the membrane.
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TPO benefits
Thermoplastic olefin (TPO) is a widely used plastic material in various industries, including automotive, construction, and marine, thanks to its unique combination of benefits.
Durability
TPO is highly durable, making it ideal for applications where material durability for long-term use is essential. It offers increased toughness and durability over conventional PP copolymers, such as in automotive bumpers and dashboards.
Weather Resistance
TPO is resistant to weathering, UV radiation, and solar UV radiation, a common problem with nylons, making it suitable for outdoor applications such as roofing membranes, waterproofing systems, and exterior siding.
Flexibility
The flexibility of TPO allows for complex shapes and designs. It also has low thermal expansion, helping maintain its shape in hot and cold environments.
Cost-Effectiveness
TPO is lightweight, reducing overall weight and improving fuel efficiency in applications such as automotive and aerospace. It is also cost-effective, reducing production and material costs.
Chemical Resistance
TPO has good chemical resistance and is used in the manufacturing of medical devices, where its resistance to chemicals and flexibility make it ideal for medical tubing.
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TPO grades
Thermoplastic olefin (TPO) is a widely used plastic material in various industries, including automotive, construction, and marine. It is a type of thermoplastic elastomer made from blending polymer and filler materials. TPO offers a unique combination of durability, flexibility, weather resistance, and cost-effectiveness.
TPO compounds are typically resin blends of polypropylene (PP) and un-crosslinked ethylene propylene rubber (EPDM) with polyethylene. They are characterised by high impact resistance, low density, and good chemical resistance. The properties of TPO products depend on controlling the size and distribution of their microstructure.
TPO can be classified into three types: the blended type, made of polyolefin and rubber components; the dynamically cross-linked type (thermoplastic vulcanizates, TPV); and the polymerised type (Reactor-TPO, R-TPO). Mitsubishi Chemical Corporation offers TPOs in a wide variety of grades, with the blended type available in medium to high hardness series and the dynamically cross-linked type in a low hardness series. Both types offer products ranging from semi-hard to flexible.
The QT Series of dynamically cross-linked TPOs possesses the performance required for various automotive parts. Additionally, a "low linear expansion grade" of TPO has been developed to meet the stringent demands of exterior automotive parts, such as bumpers and mudguards, in terms of mechanical strength, moldability, and appearance. This grade achieves excellent dimensional properties by utilising shear stress in the injection moulding process to control the rubber dispersive morphology and suppress expansion in the injection direction.
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Frequently asked questions
TPO stands for Thermoplastic Polyolefin, or Thermoplastic Olefin. It is a polymer/filler blend, usually consisting of some fraction of a thermoplastic, an elastomer or rubber, and a filler.
TPO is used extensively in the automotive industry, as well as in industrial markets. It is used in exterior and interior automotive applications, including bumpers and dashboards. It is ideal for applications where weatherability and durability are crucial.
TPO is UV-stabilised, so it does not degrade under solar UV radiation. It is also highly impact-resistant, lightweight, and chemically resistant.
