...workers at a factory making touchscreens for Apple have urged the...company to help address their grievances over chemical poisoning...Wintek...has said it used hexyl hydride... but stopped after discovering it was making workers ill..."From when hexyl hydride was used, monthly profits at Apple and Wintek have gone up ...the accumulated outcome of workers' lives and health," said the letter, signed by five workers claiming to represent employees...Apple declined to comment on the workers' letter...[W]orkers...said...[Wintek] had not given enough compensation to affected workers, had pressured those who took compensation to give up their jobs, and had not offered assurances that workers...will have medical bills taken care of...Wintek spokesman Jay Huang said all staff who needed medical treatment because of the n-hexane poisoning had been treated...