We have published explanatory materials: 'What happens when the packing swells?' We conducted an experiment.

MONOVATE(旧:日東金属工業) 八潮工場
Packing used in stainless steel airtight containers. Depending on the compatibility with the liquid, the packing may absorb the liquid, swell, and become soft. This phenomenon is called "swelling." This PDF document summarizes the results of experiments conducted to observe what happens when swelling occurs.

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Manufacturer of stainless steel containers and mixing devices available from one unit