Chemical Substance Management

Amount of PRTR-Regulated Substances Released and Transferred (SUMCO Group [Japan])

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  • *The figure for each year shows the amount of released or transferred substances during the preceding year from April through March.

The Act on Confirmation, etc. of Release Amounts of Specific Chemical Substances in the Environment and Promotion of Improvements to the Management Thereof (Law concerning Pollutant Release and Transfer Register / PRTR Law) requires businesses to report the amounts of any designated chemical substances released into the environment or transferred.
With regard to the substances subject to reporting under the PRTR Law, the SUMCO Group (Japan) measures the amounts of such substances transferred or released into the environment based on a stringent management system and issues reports without omission.

  • *Data of High-Purity Silicon Corporation has been incorporated since 2024.
List of Substances Subject to PRTR Reporting (Class 1 Designated Chemical Substances: 1 ton or more per year; Specific Class 1 Designated Chemical Substances: 0.5 tons or more per year)
Period covered: April 2023 to March 2024

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(t per year)
Name of Class 1 Designated Chemical Substance Amount handled Amount released Amount transferred
Atmos-
phere		 Public waters Soil Landfill Sewerage Waste
Silicon carbide 2,403.9 - - - - - 2,396.1
Hydrogen fluoride and its water-soluble salts 864.5 0.1 0.02 - - 0.02 232.9
Trimethylbenzene 125.8 0.6 - - - - -
Tetramethylammonium hydroxide 73.5 - 2.2 - - - -
Xylene 72.5 0.4 - - - - -
Others 124.0 3.9 0.05 - - - 36.0
Total 3,664.1 5.0 2.3 - - - 2,665.0
  • *The amount handled is not equal to the total amount released and transferred because some substances were released after decomposition and detoxification.