Polycarbonate Thermoplastic Polyurethane: Properties, Uses and Processing
Polycarbonate thermoplastic polyurethane, often called polycarbonate TPU or PC-TPU, is a type of thermoplastic polyurethane made using polycarbonate-based soft segments. It combines the flexibility and processability associated with TPU with the durability and resistance to degradation that polycarbonate chemistry can provide.
The term can sometimes be confused with a blend of polycarbonate and TPU. In PC-TPU, “polycarbonate” generally refers to the chemistry used in the polyurethane’s soft segment; it does not necessarily mean that the material is a simple blend of two separate polymers. Formulations vary, so suppliers’ technical data should be checked when selecting a grade.
What is thermoplastic polyurethane?
Thermoplastic polyurethane is an elastomer that can be softened by heat and shaped using suitable processing equipment. Its structure contains soft segments, which contribute flexibility, and hard segments, which help provide strength and elasticity. By changing the chemistry and proportions of these segments, manufacturers can produce TPU grades with different levels of hardness, flexibility and resistance to chemicals or wear.
In polycarbonate TPU, polycarbonate-based soft segments are used in place of, or alongside, other common soft-segment chemistries such as polyester or polyether. This gives the material a distinctive balance of mechanical and environmental properties.
Key properties
- Good mechanical durability: PC-TPU grades can offer a useful combination of tensile strength, flexibility and resistance to repeated flexing.
- Abrasion and wear resistance: Many grades are suitable for components exposed to rubbing, movement or regular handling.
- Hydrolysis resistance: Polycarbonate-based TPU is often selected where resistance to moisture-related degradation is important. Actual performance depends on the formulation and conditions of use.
- Resistance to oils and chemicals: Some grades perform well when exposed to oils, greases and selected chemicals. Compatibility should always be verified for the specific substance, temperature and exposure time.
- Flexibility over a range of temperatures: Depending on the grade, PC-TPU can retain useful flexibility in conditions where some other materials become less suitable.
- Thermoplastic processability: It can be processed using methods such as injection moulding and extrusion, subject to the grade’s processing recommendations.
These characteristics are not universal to every PC-TPU product. Hardness, colour, transparency, chemical resistance and service temperature can differ considerably between grades.
Common applications
Polycarbonate TPU is used in applications where flexibility must be combined with durability and resistance to demanding service conditions. Potential uses include:
- Industrial hoses, tubing and protective covers
- Flexible cable jackets and wire protection
- Automotive and transport components
- Protective films, membranes and coated fabrics
- Wearable products and flexible device components
- Industrial rollers, seals and abrasion-resistant parts
- Components exposed to repeated bending or contact with oils
Suitability for any particular application depends on the product’s design, operating environment and applicable safety or regulatory requirements.
Processing considerations
Like other TPU materials, PC-TPU is commonly processed by injection moulding or extrusion. Moisture control is important: absorbed moisture can cause processing defects and may reduce the quality of the finished part. Material should be stored and dried in accordance with the supplier’s instructions.
Processing temperatures, screw design, mould conditions and drying requirements vary by grade. The manufacturer’s technical data sheet should be treated as the primary guide. Trial runs may be needed to establish suitable settings and confirm part performance.
How does PC-TPU compare with other TPU types?
Polyether TPU is often considered for applications requiring strong low-temperature flexibility and resistance to hydrolysis. Polyester TPU may be chosen for certain applications requiring good abrasion resistance and resistance to oils. PC-TPU can offer a balance of durability and resistance to moisture-related degradation, but no one chemistry is best for every use.
When choosing between TPU types, compare the specific grades rather than relying only on broad polymer-family descriptions. Relevant factors include hardness, tensile and tear strength, abrasion performance, chemical exposure, temperature range, processing method and cost.
Choosing the right grade
Before specifying polycarbonate TPU, define the conditions the component will face. Consider:
- Operating and peak temperatures
- Exposure to water, humidity, oils, cleaning agents or other chemicals
- Required flexibility, hardness and impact performance
- Wear, abrasion and repeated-flexing demands
- Colour, appearance and transparency requirements
- Manufacturing process and production volumes
- Relevant Indian and international standards or regulatory requirements
Request current technical data and, where appropriate, test samples under realistic service conditions. For critical applications, testing should include the actual chemicals, temperatures and mechanical stresses the finished part will encounter.
Conclusion
Polycarbonate thermoplastic polyurethane is a versatile elastomer for applications that need flexibility alongside mechanical durability and resistance to challenging environments. Its performance depends on the formulation and grade, so careful material selection and processing are essential. Comparing supplier data and testing the material in the intended application can help determine whether PC-TPU is the right choice.
9 Essential Tips for Processing, Handling and Recycling Polycarbonate Thermoplastic Polyurethane (PC-TPU)
- Dry PC-TPU pellets before processing, following the supplier’s guidelines.
- Store pellets in sealed, moisture-proof packaging.
- Use the recommended melt temperature to prevent material degradation.
- Keep processing equipment clean to avoid contamination.
- Check chemical compatibility before exposure to oils or solvents.
- Use proper ventilation during melt processing.
- Choose a suitable grade for the required hardness and flexibility.
- Test UV and weathering resistance for outdoor applications.
- Recycle only where local facilities accept this material.
Dry PC-TPU pellets before processing, following the supplier’s guidelines.
Before processing polycarbonate thermoplastic polyurethane (PC-TPU), dry the pellets according to the supplier’s guidelines. Moisture in the material can cause processing defects and affect the quality and performance of the finished part. Follow the recommended drying temperature and duration, and store dried pellets carefully to minimise moisture absorption before use.
Store pellets in sealed, moisture-proof packaging.
Store polycarbonate thermoplastic polyurethane (PC-TPU) pellets in sealed, moisture-proof packaging to limit moisture absorption during storage. Keeping the packaging closed until use helps protect material quality and can reduce the risk of moisture-related defects during processing. If the pellets have been exposed to air, follow the supplier’s drying instructions before processing.
Use the recommended melt temperature to prevent material degradation.
Follow the grade supplier’s recommended melt-temperature range when processing polycarbonate thermoplastic polyurethane (PC-TPU). Excessive heat or prolonged residence time in the barrel can degrade the material, potentially causing discolouration, loss of strength or inconsistent processing. Check the technical data sheet, ensure temperature settings are accurate and avoid leaving molten material in the machine longer than necessary.
Keep processing equipment clean to avoid contamination.
Keep processing equipment clean when working with polycarbonate thermoplastic polyurethane to prevent contamination that could affect the material’s appearance, consistency and performance. Before production, remove residues from hoppers, screws, barrels, dies and moulds, and use a suitable purging procedure when changing materials or colours. Follow the equipment and material supplier’s cleaning recommendations, and take care to avoid introducing moisture or incompatible cleaning agents into the process.
Check chemical compatibility before exposure to oils or solvents.
Before exposing polycarbonate thermoplastic polyurethane (PC-TPU) to oils or solvents, check that the specific grade is compatible with the chemicals involved. Resistance can vary with the chemical, its concentration, temperature and duration of contact. Consult the supplier’s technical guidance and, for critical applications, test a sample under conditions that closely match actual use.
Use proper ventilation during melt processing.
Ensure adequate ventilation when melt-processing polycarbonate thermoplastic polyurethane (PC-TPU). Heating the material may release fumes or vapours, particularly if it is overheated or contaminated. Follow the supplier’s processing-temperature guidance, keep extraction systems functioning, and avoid inhaling emissions. Where required, use suitable personal protective equipment and follow workplace safety procedures.
Choose a suitable grade for the required hardness and flexibility.
Choose a polycarbonate thermoplastic polyurethane (PC-TPU) grade that matches the hardness and flexibility required for the application. Softer grades generally provide greater flexibility, while harder grades offer more firmness and support. Check the supplier’s technical data sheet for hardness values and other performance details, and test the material under realistic conditions to ensure it meets the needs of the finished product.
Test UV and weathering resistance for outdoor applications.
For outdoor applications, test polycarbonate thermoplastic polyurethane (PC-TPU) for resistance to ultraviolet (UV) exposure and weathering before finalising the material. Sunlight, heat, moisture and changing temperatures can affect colour, flexibility and mechanical performance over time. Assess the selected grade using relevant accelerated-weathering tests, then verify results under conditions that reflect its intended use. This helps ensure the component can withstand its outdoor environment and retain the properties required throughout its service life.
Recycle only where local facilities accept this material.
Recycle polycarbonate thermoplastic polyurethane (PC-TPU) only where local recycling facilities explicitly accept it. Recycling options can vary by location and facility, so check local guidelines or contact your waste-management provider before placing it in a recycling bin. If it is not accepted, follow local instructions for safe disposal.