Why are two sets of property data shown in nylon data sheets?
Most nylon manufacturers publish “as-molded” (or “dry-as-molded”) and “conditioned” property values. As-molded properties represent the properties of parts as they come out of the mold. These parts begin absorbing moisture from the atmosphere immediately. The amount of moisture in the parts is a function of time since molding and the temperature and humidity of the atmosphere to which the parts are exposed. The parts will eventually achieve an equilibrium moisture content based on the temperature and humidity. Conditioned properties are those of the parts after this equilibrium moisture content is achieved. The data sheet should say what these conditions are, and most manufacturers use the standard ASTM laboratory conditions of 73 °F (23 °C) and 50 % relative humidity.
