Protecting the precious environment
Supply chain

We promote activities to protect and improve the global environment in alliance with partner companies.

Green procurement initiatives

Initiatives to select materials with smaller environmental footprint is called green procurement. As part of our green procurement initiatives, we investigated 14 green procurement materials for FY2021 and counted their quantity.

Going forward, we will review and add green procurement materials as necessary in consideration of green procurement results, social trends and other factors.

Item Unit FY2017 FY2018 FY2019 FY2020 FY2021
Steel for electric furnace
(reinforcing steel)		 1,000t 203 228 198 187 169
Blast furnace cement and
freshly-mixed concrete		 1,000m3 176 225 210 208 225
Recycled tiles 1,000m2 302 356 329 226 220
Recycled plasterboards 1,000m2 4,566 4,765 4,793 4,537 4,900
Particle boards
(double flooring)		 1,000m2 189 255 247 267 378
Styrene materials
(wall-backing packing)		 m3 395 419 366 377 325
Water-saving toilet bowl 1,000units 16 20 15 15 16
Rooftop and wall greening 1,000m2 11 11 9 1 9
Permeable paving 1,000m2 16 26 23 30 21
SUS piping (water supply piping in communal areas) t 84 53 29 21 31
LED lighting equipment 1,000units ー ー ー 194 304
Long vinyl sheets 1,000m2 280 383 369 293 329
Extruded polystyrene foam 1,000m3 4 4 4 4 34
CFC-free urethane foam 1,000m2 ー 389 720 890 892

* Data for extruded CFC-free urethane foam since FY2018, and LED lighting equipment since FY2020.

Blast furnace slag cement type B

Blast furnace slag cement type B, which is superior against cracks and in terms of chemical resistance, is mainly adopted in concrete piles. CO2 generated during cement production is the largest in volume during the manufacturing process of clinker, an interim product of cement. The production of blast furnace slag cement involves mixing large volumes of blast furnace slag fine powder into normal cement, which leads to a much lower composition ratio of clinker than in normal cement, and in turn, reduction of CO2 emissions.

In fiscal 2021, adoption of blast furnace slag cement type B was 224,564 m3, resulting in the reduction of CO2 emissions by approx. 25,000t.

Concrete piling installation

Particle boards

We send waste wooden materials generated at construction sites to recycling facilities for recycling the waste into particle boards, and then use the particle boards manufactured from recycled waste at our construction sites. We thus engage in circular material recycling. This effort leads to the mitigation of environmental impact as the manufacturing process using recycled waste can reduce CO2 emissions, as compared with the manufacturing process using fresh wood, while it also contributes to conservation of forests.