What is the rationale for dryness value of porus load is NLT 95and non prous loads NLT 90?

GOOD VALIDATION PRACTICE (cGVP)
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Steam quality test:dryness value

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EN 285 describes dryness value: The sterilizer shall be designed to operate with saturated steam with a dryness value down to 0,95 for metal
loads and 0,90 for other types of load…