Based on positive pressure method, LSSD Leak and Seal Strength Detector can test whole and partial seal-leakage character of flexible packages such as caps, containers, and flexible tubes. Burst Test involves puffing air into packages to increase inside pressure until packages burst, while Creep Test keeps pressures inside packages for regulated period of time. With Creep to Failure Test, instrument increases pressures inside package bags to specified pressure and keeps it until packages leak.