Dear sir,

I wonder that, why does saturated steam better than super heat steam. I'd like to know, are there the books for this object?

Thanks for your recommend

Dear

Saturated steam is mandatory for effective sterilization by steam. "Saturated" means steam must have a relative humidity of 97% to 100%. Saturated steam is an extremly effective "carrier" of thermal energy.
When steam enters the sterilizer chamber under pressure, it condenses upon contact with cold items. This condensation liberates that, simultaneously heating and wetting all items in the load, thereby providing the two requisites: moisture and heat. No living organism can survive direct exposure to saturated steam at 120° C longer than 15 minutes.
When the amount of entrained water drops below 3% the steam is called superheated or dry steam and sterilization cannot be accomplished. Than the process practically becomes dry heat sterilization for which different temperature/time relationship are needed.
My book recommendations are:
Sterilization of Medical Supplies by Steam, Volume 1 - General Theory, by Jan Huis and
Central Service Technical Manual, sixth edition, published by IAHCSMM. See References, Books on our Education page.

Kind regards
Josy