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Why do some material names have an appendix such as a * (Air*) or % (R-510%)?

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Why do some material names have an appendix such as a * (Air*) or % (R-510%)?

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The symbol * signifies a different reference reference value for enthalpy. The % sign symbolizes a refrigerant blend. The saturation pressure is a function of temperature as well as quality for such mixtures.

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