Management and Reduction of Chemical Substances

Activities and Results

Hazardous Material Management Activities

Environmentally hazardous materials are defined as materials that may be harmful to the human body or ecosystems when contained in a product. In principle, we prohibit the use of such substances in our components and raw materials. For hazardous substances that may be present as impurities, we have established tolerances and handle such materials accordingly.
With regard to the Restriction of Hazardous Substances Directive (RoHS)1 and REACH Regulation2 in the EU and the Administrative Measure on the Control of Pollution Caused by Electronic Information Products3 in China, we have adopted our Green Procurement Guidelines at our production facilities in and outside of Japan and provide information necessary to meeting our customers’ requirements. In addition, we submit REACH reports to the relevant authorities as required.
We stringently manage chemicals specified in the PRTR Law4 and are working to switch to products that do not contain such substances. Our goal is to reduce our handling of these chemicals by 3% each year, and we achieved a reduction from last year, going from 38,293 kg in 2019 to 37,962 kg in 2020. Please visit our homepage for details about our initiatives at each production facility.

  • 1 RoHS Directive: Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment Regulations
  • 2 REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) Regulation: A regulation that requires almost all chemicals sold in the EU to be evaluated for safety and to be registered
  • 3 Administrative Measure on the Control of Pollution Caused by Electronic Information Products: A law, also called “China RoHS,” that requires disclosure when certain hazardous substances are present in electronic information products and components
  • 4 PRTR Law: Law Concerning Reporting, etc. of Releases to the Environment of Specific Chemical Substances and Promoting Improvements in Their Management
PRTR Substance Amount and Air Emissions
Substance Amount Air
Xylene 1,091 172
Toluene 2,106 419
Ethylbenzene 310 53
Benzene 109 37
Methylnaphthalene 30,605 50
Other 3,741 147
Total 37,962 877

Efforts at Each Production Facility

Kofu Plant

Adopting Green Office Supplies

Thirty-nine types of office supplies were replaced with eco-friendly alternatives in January 2020. As a result, all office supplies used throughout the factory are now green products.

Mie Plant

Upgrading the Anti-Rust Oil

Beginning September 2020, the anti-rust oil used in middle processes (for almost all products without customer-specified requirements that are in-between processes) was switched to a type that does not contain PRTR substances. As a result, the monthly volume of 1,2,4-Trimethylbenzene (a PRTR substance) used was reduced from 52 kg to 0 kg.

THK RHYTHM Hamamatsu Plant
Green Distribution

Packing Material Reduction

THK RHYTHM switched from using wooden crates to adopting reusable, triple-wall (reinforced) cardboard containers for grease shipments to TMA (USA) and TRNA (USA) beginning July and November 2020, respectively.


In addition, as of December, parts imported from TRMS (Malaysia) are now shipped in returnable containers (folding boxes) instead of cardboard.


Transportation Efficiency Improvement

Beginning October 2020, a packaging improvement has allowed bearings that THK RHYTHM Kyushu exports to TRA CZECH to be stacked in three layers instead of one.


Green Distribution

Load Efficiency Improvement

As of May 2020, shipments between the Wuxi plant and THK MANUFACTURING OF CHINA (CHANGZHOU) now use a different method of loading products onto the 10-ton trucks, using a single level of steel pallets instead of creating two levels of wooden pallets with a steel platform. The load capacity has increased from 8 tons to 10 tons, and 10 pallets can now be loaded instead of 9. In addition, the new packing method for SRS products implemented in July has improved the load efficiency by allowing two layers of boxes to be stacked instead of one.

Truck loading method change


In consideration of employee health, the TRA CZECH plant ceased using abrasives that contain an SVHC material (boric acid, sodium salt, pentahydrate) as of June 2020.