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  1. mechintern

    Plastics thread seating torque

    The nut is used to hold the unit on a bracket, so it has nothing to do with maintaning a liquid tight seal. Yes, it is a rather light duty structure. It weighs 5 ounces at max. It should not see any major vibration or jarring, just mainly temperature variation which could cause a problem...
  2. mechintern

    Plastics thread seating torque

    Thanks for the quick response desertfox. This unit will actually be in a carwash, so it will most likely see large temperature ranges which is why we will thermally shock the units before sending them out. We have also seen issues with the solvents found in the car wash causing the units to...
  3. mechintern

    Plastics thread seating torque

    I am trying to find out how much torque I should apply to a plastic nut which is fastened to plastic threads. Both are made of PC/ABS plastic. I have done some failure testing of 100 parts, and they failed at an average of 150 inch pounds. I have found sources that suggest using 75% of the...
  4. mechintern

    PC/ABS molded-in stress quick check

    Is there any specification about the concentrations of acid that should be used? Any response would be appreciated. Thanks
  5. mechintern

    Vacuum Leak Testing

    I am performing a leak test where an encapsulated electronic device is submerged about 10 cm under water. A vacuum pump then pumps air out of the seal chamber to 20inHG. I was wondering if this is a better test than submerging the unit under 2 meters of water. Basically we are dealing with a...

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