Presto’s Secure Seal Tester is widely used to test thread and seal integrity on plastic and glass carbonated beverage containers. The instrument is specially designed to address the special requirements if sealing carbonated beverage containers that use aluminium roll-on, plastic caps or twist crowns. By detecting gas leakage, instead of liquid, the secure seal tester provides more accurate and sensitive readings.
In this test, the sample that is to be tested is placed inside a vacuum kit or desiccator. The bottle is cut into sections and the section with seal is kept for the testing. A leaky seal will allow the air to pass through it without showing any uncertain behaviour. On the other hand, an intact seal would behave differently when exposed to vacuum pressure.