Management of Chemical Substances and Pollution Prevention

Independent Practitioner's Assurancecheckmark

Reducing the amount of PRTR-related substances

In FY2016 the number of substances specified by PRTR* with a handling volume of 1 ton or more (0.5 tons or more for Class I specified) was 23 with a decrease of 2 substances from the previous year.
Among all PRTR-listed substances. the three substances of xylene, ethyl benzene and toluene account for approximately 92% of the emissions from Komatsu and Komatsu Group manufacturing facilities. Most of these emissions are released into the atmosphere.
At the Komatsu and Komatsu Group manufacturing facilities, we are undertaking initiatives such as switching to paints with lower proportion of PRTR-listed substances, using high-solid paints, improving coating efficiency and reducing film thickness. Also, we are changing the substances handled in large volumes are to secondary materials that contain less PRTR-listed substances in order to reduce the handling volumes of such substances. The amount of emissions for FY2016 has been reduced by about 3% from the previous year.

  • PRTR: Law designed to mandate the disclosure of the amount of specific chemical substances released into the environment to promote the management of such substances (The notification system based on the PRTR Law)

Reducing the amount of VOC released

Komatsu Cabtec Co., Ltd.'s Painting Line
Komatsu Cabtec Co., Ltd.'s Painting Line

The majority of VOC emissions are from VOC contained in paint, such as Xylene and Ethyl benzene.
The amount of emissions in FY2016 has slightly increased compared to the previous year, but we have maintained a 50% reduction as compared to FY2005 in the amount of VOC emissions per units of manufacturing value.
Komatsu Cabtec Co., Ltd. has worked as one with the young technicians of the manufacturing technology department and the procurement department on projects, and made major improvements in paint quality by introducing new technology and cutting down paint costs, and at the same time contributed to the improvement of the painting technology of the Komatsu Group as a whole, and won the 2016 Citation from the General Manager of Manufacturing.

Names of Class I Designated Chemical Substances and the Amounts Released and Transferred from Komatsu Group Manufacturing Facilities in Japan

(handling 1 ton or more, or 0.5 ton or more for Class I Specified Chemical Substances) (applicable PRTR substances from April 2010)

(Unit: t)

Number under the PRTR Law Name Amount handled Amount released Amount transferred Chemically transformed or eliminated Amount Contained in Products
Air Water Soil Buried Sewage Waste

412

Manganese and its compounds

374.0

0.6

0.0

-

-

-

8.2

0.0

365.2

80

Xylene

224.2

165.5

-

-

-

-

15.7

42.4

0.5

53

Ethylbenzene

149.6

123.2

-

-

-

-

10.6

15.4

0.4

87

Chromium and chromium (Ⅲ) compounds

126.3

0.0

-

-

-

-

1.2

-

125.1

438

Methylna phthalene

76.0

0.4

-

-

-

-

-

75.7

-

300

Toluene

72.4

56.7

-

-

-

-

8.8

6.9

-

296

1,2,4- trimethyl benzene

66.9

19.3

-

-

-

-

1.7

40.0

0.1

453

Molybdenum and its compounds

35.6

-

-

-

-

-

0.0

-

35.6

448

Methylenebis (4,1phenylene) = diisocyanate

27.0

-

-

-

-

-

0.0

26.5

0.5

308

Nickel

15.2

0.0

-

-

-

-

0.0

-

15.2

88

Chromium (Ⅵ) compounds *1 *2

9.3

0.0

-

-

-

-

2.3

-

-

321

Vanadium compounds

8.7

-

-

-

-

-

0.0

-

8.7

297

1,3,5- trimethyl benzene

8.5

4.3

-

-

-

-

0.4

3.8

-

132

Cobalt and its compounds

7.6

-

-

-

-

-

0.9

-

6.7

277

Triethylamine

6.3

1.3

-

-

-

-

0.0

5.0

0.0

207

2, 6-Di-tert-butyl-4-cresol

5.5

0.0

0.0

-

-

-

0.9

-

4.6

349

Phenol *3

4.3

0.0

-

-

-

-

-

4.3

-

258

1,3,5,7- tetraaza tricyclo[3, 3,1,1(3,7)] decane *3

3.9

0.0

-

-

-

-

0.0

2.1

1.7

188

N,N- dicyclohe xylamine

3.1

0.0

0.0

-

-

-

2.8

0.2

0.1

302

Naphthalene

2.7

1.4

-

-

-

-

0.4

0.9

-

83

Isopropyl benzene

2.6

1.5

-

-

-

-

0.1

1.0

-

392

n-hexane

2.4

0.7

-

-

-

-

0.0

1.7

-

405

Boron Compounds

1.6

-

-

-

-

-

0.3

1.2

0.1

  1. During chrome plating, chromium (Ⅵ) compounds become chromium compounds. Therefore, the amount transferred and the amount contained in products are entered as chromium and chromium(Ⅲ) compounds.
  2. PRTR Class I Specified Chemical Substances
  3. Although the amount contained is below the amount that requires registration with the PRTR, we report the data because the amount released exceeds one ton.

Breakdown of the Amount of PRTR-related Substances Released and Transferred from Komatsu Group Manufacturing Facilities in Japan

Amount of PRTR-related Substances Released from Komatsu Group Manufacturing Facilities in Japan

Amount of PRTR-related Substances Released from Komatsu Group Manufacturing Facilities in Japan

Amount of VOC Released from Komatsu Group Manufacturing Facilities in Japan

Amount of VOC Released from Komatsu Group Manufacturing Facilities in Japan