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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 '20 at 15:53
  • $\begingroup$ DAM is probably an abbreviation for "Dry as moulded". $\endgroup$
    – alephzero
    Feb 18 '20 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! $\endgroup$ Feb 18 '20 at 20:58
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The relative humidity (RH) is the ratio of the actual water vapour pressure to the saturation water vapour pressure at the prevailing temperature. For example – if a cubic metre can hold 100ml of water at 20 degrees centigrade (273 K) and it does contain 100ml then it is said to be 100% RH. If the same cubic metre of air at the same temperature only contains 50mls of water then it is described as 50% RH.

$\rm{RH = \frac{p}{p_s}}$

DAM Meaning is: Dry As Molded.

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