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Development of Scalable Process Technology Particle-void Polyester (PET) Passive Cooling Fibre

HKRITA
Overview

This project has achieved passive radiative cooling function by using selected metal oxide particles and their particle-void structure, which are integrated into PET fibres.

  • Development of Scalable Process Technology Particle-void Polyester (PET) Passive Cooling Fibre
Research completion
2024
Commercialisation opportunities
technology licensing agreement
Problem addressed

While polyethylene (PE) can support passive cooling, its weakness, flammability and lack of durability make it unsuitable for everyday textiles. Polyester (PET), by contrast, is strong and widely used in garments but does not naturally possess the optical properties required for passive cooling.

Innovation
  • These fibres reflect solar ultraviolet and visible light, enhancing the cooling effect and achieving a 3.7°C temperature reduction under sunlight compared to conventional PET fabrics.
Key impact
  • This technology can significantly reduce heat stress for individuals working outdoors or participating in intense sports.
  • The process is simple to scale up and offers a low-cost solution for mass production.
  • By reducing dependence on active cooling methods like air conditioning, the technology supports broader goals in energy conservation and sustainable design
Award
  • Bronze Medal in the 50th International Exhibition of Inventions of Geneva (2025)
Application
  • Application in outdoor uniforms for high-temperature workplaces
  • Application in sportswear

Patent

  • 22025102741.7
  • PCT/CN2025/126679
The Hong Kong Research Institute of Textiles and Apparel (HKRITA)

Established in 2006, The Hong Kong Research Institute of Textiles and Apparel (HKRITA) is funded by the Innovation and Technology Commission of the HKSAR government, and hosted by The Hong Kong Polytechnic University. 

HKRITA has achieved research deliverables over the years around our research clusters targeting in sustainability, industry advancement and social benefits through our centre-owned research teams and laboratories as well as collaborations with industry partners and institutions. 

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