This invention relates to a process for the synthesis of diacyl peroxide by contacting acyl halide and peroxide complex in compatible aprotic solvent substantially free of compounds oxidizable by the peroxide complex or the reaction products of organic acyl halide with peroxide complex and the initiation of polymerization with diacyl peroxide in the aprotic solvent. The metal shaft of the cooling fan is coated with a layer of ceramic material. The apparatus further includes a transfer portion for transferring reaction vessels in succession between the reaction, detecting and cleaning portions. The key is employed in connection with authenticating the password on the protected module.