March 6 (Reuters) - The U.S. government is urging the

Netherlands, Germany, South Korea and Japan to further tighten

curbs on China's access to semiconductor technology, Bloomberg

News reported on Wednesday.

The U.S. wants Japanese companies to limit exports to China

of specialized chemicals required for chipmaking, including

photoresist, the report said citing people familiar with the

matter.

Washington is also pressing the Netherlands to stop

semiconductor equipment maker ASML from servicing and

repairing chipmaking equipment for Chinese clients bought before

limits on sales of those devices were put in place this year,

the report added.

Tokyo and The Hague want to assess the impact of their

current curbs before considering tougher actions, the report

said, adding that the U.S. Commerce Department officials raised

the issue in Tokyo during a meeting on export controls last

month.

American officials had earlier expressed particular concerns

about China's ability to employ advanced chips, and the powerful

processors they enable, for its fast-growing military.

Representatives of the US Commerce Department, Japan's trade

ministry and the Dutch foreign ministry did not immediately

respond to a Reuters request for comment, while ASML could not

be immediately reached.