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  1. Gerry02

    Mass/CoG - Drawing standards

    Are there any standards in North America that detail when to add Mass/Centre of Gravity to engineering drawings
  2. Gerry02

    O-ring permeability in vacuum

    I am trying to calculate what the effect on vacuum would be from an o-ring sealing water - vacuum for different o-ring materials looking specifically at permeation. I found the following formula for calculating o-ring permeability: Q = K A (P1 - P2) / D Q is the permeation rate (cm3/sec) K...

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