One out of every four Korean manufacturers feels threatened by the Economic Cooperation Framework Agreement signed in June between China and Taiwan, a survey reveals.

In the survey of 615 manufacturers released Tuesday by the Korea Chamber of Commerce and Industry, 25.4 percent of respondents expressed worries about the pact, which integrates the two economies into a single market.

Among exporters targeting the Chinese market, the figure reached 40 percent.

Some 45.6 percent of respondents said the ECFA will have adverse effects on their business, while only 28.1 percent expected positive effects from it.

The machinery sector was the most pessimistic with 55.6 percent concerned about the deal, followed by the semiconductor (52.4 percent), textile (48.8 percent) and petrochemical (48.2 percent) industries.