DIA Technical News - Thermal disinfection of linen

We received a question in the office last week about thermal disinfection, and we thought it timely to send out the information again on the times and temperature required when using thernal disinfection processes in a laundry.

The information below is taken directly from the Australian/New Zealand Standard AS/NZS 4146:2000 Laundry Practice:

3.5.2 Thermal

Soiled linen that is to be thermally disinfected shall be washed so that the temperature of the load is maintained at a minimum of 65 degrees celsius for not less than 10 minutes, or at a minimum of 71 degrees celsisu for not less than 3 minutes.

As it will take time for heat to penetrate the load, an allowance for mixing time and load level shall be made to ensure that the load is maintained at the correct temperature for the minimum time period.  For low loading 4 minutes shall be allowed, and for high loading 8 minutes.  The minimum time/temperature combinations are therefore:

(a) 65 degrees celsius for not less than 10 minutes; minimum cycle time 14 minutes for low loading or 18 minutes for high loading; or

(b) 71 degrees celsius for not less than 3 minutes; minimum cycle time 7 minutes for low loading or 11 minutes for high loading.

If the linen is heavily soiled, a sluice cycle shouldbe used before the disinfection cycle.

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