Hermetically sealed container and test for seal leakage thereof.

摘要

An hermetically sealed container such as used in packaging of foods, powders, or material where ingress of moisture or contaminants is to be prevented, comprises a dished sidewall (61) having a peripheral flange (64), a sidewall (74) with a peripheral part engaging said flange and a seal formed between said peripheral flange and peripheral part which comprises two regions (76,79) of sealing material extending one alongside the other provided on said part and/or said flange and an evacuated cavity (70) provided by a channel formed in the peripheral flange or part which separates the regions of sealing material. Methods of testing such seals where the channel is pressurised or evacuated are also disclosed.