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I'm looking to determine the difference between the two yield strengths on a Matweb material property table for DuPont Performance Polymers Zytel® 105F BK010 PA66. The top is for "50% RH; ISO 527-1/-2" per the comments and the bottom is "DAM;ISO 527-1/-2". I need to know what 50% RH and DAM mean so I can make an informed decision. Any help would be appreciated.

Image from Matweb Table

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  • $\begingroup$ 50% relative humidity is the half the maximum capacity of air to hold water at a particular temperature. Look up psychrometric chart for details. $\endgroup$ – Transistor Feb 18 at 15:53
  • $\begingroup$ DAM is probably an abbreviation for "Dry as moulded". $\endgroup$ – alephzero Feb 18 at 16:00
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DAM means "dry as manufactured" or "dry as moulded", i.e. the material is in its moisture-free state immediately after manufacture. The DAM moisture content is typically less than 0.2%.

"50% RH" means the material has absorbed moisture from an environment with 50% relative humidity until it has reached an equilibrium state.

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  • $\begingroup$ Thanks that helps! $\endgroup$ – Brice Edward Furr Feb 18 at 20:58

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