In a report published on Sunday, New York-based watchdog China Labor Watch accused the iPhone maker and its production partner of numerous labor-law infractions at its factory in Zhengzhou, China, including that more than 50% of workers are temporary, or "dispatch."
Workers at the factory put in "at least 100 overtime hours a month" during peak production seasons, even though Chinese labor law states they must not work more than 36 overtime hours a month, the group said.
It also noted that the factory doesn't provide workers with adequate personal protective equipment, and that workers don't receive any occupational health and safety training.
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"We looked into the claims by China Labor Watch and most of the allegations are false," Apple responded in a statement. "We have confirmed all workers are being compensated appropriately, including any overtime wages and bonuses, all overtime work was voluntary and there was no evidence of forced labor."
Apple said it found during its investigation that the percentage of temporary workers exceeded its standards. "We are working closely with Foxconn to resolve this," the company said.
The allegations come as Apple prepares to lift the curtain this week on its latest round of iPhones and other products. Analysts and investors are not expecting significant changes to the company's iPhone and watch offerings.
Shares of Apple were up 1.24% at $215.90 in early trading on Monday.