Osaka Gas Donates 'Tsuna-Ki' Wooden Space Units Featuring Recycled Outer Membrane from Expo 2025 'Gas Pavilion: Ghost Wonderland' to Osaka City

On March 26, Osaka Gas Co., Ltd. (hereinafter 'Osaka Gas') donated two 'Tsuna-Ki' wooden space units to the Osaka City Kita Ward Office as part of its legacy initiatives for the Expo 2025 Osaka, Kansai, Japan 'Gas Pavilion: Ghost Wonderland' (hereinafter 'Gas Pavilion'). The units feature covers repurposed from 'SPACECOOL,' a radiative cooling material originally used for the pavilion's outer membrane. The SPACECOOL material was acquired from the Japan Gas Association.

The 'SPACECOOL' material used for the Gas Pavilion was developed by Osaka Gas, with ongoing development for practical applications led by SPACECOOL Inc. By reflecting sunlight and releasing heat into outer space through the principles of radiative cooling technology, the material can lower temperatures below ambient air levels even under direct sunlight without the use of energy, drawing significant attention as an excellent heat-mitigation product.

'Tsuna-Ki' is a modular building unit co-developed by Nikken Sekkei Ltd., which designed the Gas Pavilion, and Sanshin Metal Industry Co., Ltd. It allows for the assembly of spaces in various sizes and configurations using wood and specialized clamps. By utilizing SPACECOOL as the side walls and ceiling membranes for 'Tsuna-Ki,' it is possible to provide heat-shielded spaces for a variety of purposes. The 'Tsuna-Ki' units are scheduled to be used for events and other activities at the Osaka City Kita Ward Office.