Supplemental report is being filed since the results of investigation are available.No lot number was provided by the customer; therefore, a review of the manufacturing device history record could not be performed.No sample was provided by the customer; therefore, an evaluation of the complaint device for deficiency of construction could not be performed.Photos were sent with the case but are not for the reported product code.Discussions were held with the team from engineering, production, and quality to determine assignable cause and corrective actions for canister that have either lost suction on high, low, or both and/or cracked at the base.The team reviewed the photos that were submitted for the sister complaint as well as the samples from the same sister complaint.It is clearly evident by the smeared and missing print that the hard canisters are being cleaned with contra-indicated cleaners spelled out in the instructions for use.The investigation has also revealed that the hard cans are left on continuous suction 24/7.This practice is contra-indicated by the instructions for use.Solvents attack the areas of highest stress concentration which is around the bottom edge of the canister and at the gate (center of the bottom) making it weak.The continuous high suction will cause the hard canister to break at the weak spots.The combination of contra-indicated cleaners and the continuous high suction will create conditions for canister defects.The instructions for use detail information regarding continuous suction and what type of cleaners to use on the hard canisters, as stated: hardware warnings: 1.Cleaning agents that contain quatemary ammonium salts, strong alkalines or chlorinated benezene (phenols) based hydrocarbons may cause chemical degradation of the material.This could lead to a failure of the products to perform as intended.Warnings: 1.This product is not designed to be kept under vacuum when not in use.Prolonged static vacuum may increase the risk of cracking or implosion.The assignable cause is customer misuse.The damage to the canisters is caused by using contra-indicated cleaners which weaken the polycarbonate followed by continuous high suction 24/7.Trending of past complaint reports indicate that this is the 1st reported incident of canister cracking at bottom for product code 65652-611 in the past three calendar years.
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