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Komatsu's Environmental and Social Activities Enhancing Quality of Life


Environmental Risk Management  Management of Chemical Substances and Pollution Prevention

Reducing the amount of PRTR-related substances

The number of substances covered by PRTR* with a handling volume of 1 ton or more (0.5 ton or more for Class I Specified) in FY2014 has remained at 23, unchanged from the previous year. The handling volume (1 ton or more) has been reduced about 10% from the previous year.

Among all PRTR-listed substances, the three substances of xylene, ethyl benzene and toluene account for approximately 94% of the emissions from Komatsu and Komatsu Group manufacturing facilities. Most of the emissions are released into the atmosphere.

At domestic Komatsu group production facilities, initiatives, such as switching to paints with a lower proportion of PRTR-listed substances, using high-solid paints, improving coating efficiency and reducing film thickness, are being undertaken for the continuous reduction of handling volumes. Also, substances handled in large volumes are being changed to secondary materials that contain chemical substances having less impact on the human body. The amount of emissions in FY2014 has been reduced by about 12% 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

A painting operation at Osaka Plant using a paint having a higher coating efficiency

A painting operation at Osaka Plant using
a paint having a higher coating efficiency.

The majority of VOC emissions are from VOC contained in paint such as Ethylbenzene and Xylene.

The amount of emissions in FY2014 has been reduced by about 15% from the previous year by switching to paints having a less content of volatile matter, migrating to paints having a higher coating efficiency and so on.

Further improvement efforts continue in pursuit of further reductions.

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 384.2 0.6 0.00 - - - 7.4 0.0 376.2
80 Xylene 286.5 207.6 - - - - 23.8 54.7 0.4
53 Ethylbenzene 188.5 154.8 - - - - 15.1 18.2 0.4
87 Chromium and chromium
(III) compounds
123.8 0.0 - - - - 1.7 - 122.1
438 Methylna
phthalene
111.7 0.6 - - - - - 111.1 -
300 Toluene 98.4 74.7 - - - - 15.5 8.1 -
296 1,2,4-
trimethyl
benzene
68.4 16.1 - - - - 2.2 50.1 0.0
453 Molybdenum and
its compounds
41.1 - - - - - 0.0 - 41.1
448 Methylenebis (4,1
phenylene) = diisocyanate
31.7 - - - - - 0.0 31.4 0.3
308 Nickel 14.5 - - - - - 0.0 - 14.5
321 Vanadium compounds 11.3 - - - - - 0.0 - 11.3
88 Chromium (VI)
compounds *1 *2
11.0 0.0 - - - - 2.7 - -
297 1,3,5-
trimethyl
benzene
9.1 4.4 - - - - 0.6 4.1 -
207 2,6-Di-tert-butyl-4-
methylphenol
8.9 0.0 - - - - 1.1 - 7.8
277 Triethylamine 8.6 1.9 - - - - 0.0 6.6 -
132 Cobalt and its compounds 7.6 - - - - - 0.9 - 6.7
258 1,3,5,7-
tetraaza
tricyclo[3,
3,1,1(3,7)] decane *3
4.8 - - - - - - 2.5 2.3
188 N,N-
dicyclohe
xylamine
4.6 0.3 0.0 - - - 4.0 0.2 0.1
349 Phenol *3 4.3 0.0 - - - - 0.0 4.3 0.0
392 n-hexane 3.2 - - - - - - 1.9 -
302 Naphthalene 2.7 1.2 - - - - 0.5 1.0 -
83 Isopropyl
benzene
1.6 0.9 - - - - 0.1 0.6 -
1 Zinc compounds
(water- soluble)
1.2 - - - - - 0.1 - 1.1
*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

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

Amount of PRTR-related Substances Released

from Komatsu Group Manufacturing Facilities in Japan

Changes in the Amounts of PRTR-related Substances Released* at Group Manufacturing Facilities in Japan

Amount of VOC Released from Komatsu Group

Manufacturing Facilities in Japan

Amount of VOC Released by Group Manufacturing Facilities in Japan