How do manufacturers test the airtightness of lids on polyethylene outdoor trash cans?

Manufacturers employ rigorous testing methods to ensure polyethylene outdoor trash can lids achieve proper airtightness, which is crucial for odor containment, pest prevention, and overall durability. The primary testing methods include water submersion tests, where pressurized cans are submerged to detect air bubbles indicating leaks. Vacuum decay testing involves placing the sealed container in a chamber, creating a vacuum, and monitoring pressure changes that reveal leaks. Pressure decay testing pressurizes the container and measures pressure drop over time. Many manufacturers follow ASTM International standards, particularly ASTM D4991 for empty rigid containers, which specifies procedures for leak detection. Additional methods include ultrasonic testing for microscopic leaks and tracer gas detection using helium or hydrogen. Quality control processes typically involve both random batch testing and 100% inspection for premium product lines. The acceptance criteria usually require lids to maintain seal integrity under specified pressure differentials, typically ranging from 2-5 psi for residential cans to higher pressures for commercial units. These comprehensive testing protocols ensure that polyethylene trash cans meet performance expectations in various environmental conditions while preventing liquid ingress and containing odors effectively.