A company official said it was following a 2006 decision of the Kandal court that provided 210 hectares to the company.
Kampong Cham province had the most complaints, 18, followed by Takeo with 17, and Phnom Penh, Kandal and Prey Veng with nine each.
The garment industry raised its loss estimates to $15 million on Wednesday in the wake of a general strike last week.
In the wake of last week's strikes, the leader of a federation of unions said workers need even greater unity to defend their interests.
The explosion ignited fires across five houses, but those were extinguished when nearly 10 fire trucks arrived at the scene.
Workers continued to demonstrate on Monday, demanding that union representatives be allowed back to work.
Political freedoms that were won in the 1980s, following the ouster of the Khmer Rouge, have been in decline, the leaders said.
Chea Mony estimated about 10 factories had closed due to strikes.
Cambodia is heavily reliant on foreign assistance, which provides half its budget, more than $1 billion annually.
Adhoc has so far this year received 28 reports of worker violations from employers in Malaysia.
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