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Autoclave loading pattern: How to load the autoclave correctly

The correct loading of an autoclave is crucial to ensure effective sterilisation.

Discover Autoclaves
Summary

Key requirements for loading the autoclave

Loading the autoclave correctly is crucial for achieving optimal drying and sterilisation results. Below is an overview of the key recommendations from the blog post:

  • Adhere to the maximum loading capacity: The load must not exceed the capacity permitted by the autoclave programme being used.

  • Arrange the packaged instruments correctly: Instruments wrappedin foil must not overlap by more than about a third on the tray, so that steam can reach the load sufficiently.

  • Distribute the load sensibly within the chamber: Packaged items should be placed in the upper section. Unpackaged items and heavy sterilisation containers should be placed at the bottom.

  • Arrange the spiral test pattern correctly: The spiral test pattern must be positioned in accordance with the reference load specified in the relevant validation report.

  • Stack the sterilisation containers correctly: Sterilisation containers with stacking feet can be stacked in accordance with the intended stacking configuration without the need for additional supports.

Discover Autoclaves

Publication date: 23 April 2026

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Author: Siegfried Weinhart

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Optimised loading patterns for different applications

The correct loading of your autoclave is crucial for safe and efficient sterilisation. An incorrect arrangement can impair the steam circulation and worsen the drying results. To ensure that your instruments are optimally reprocessed, you should observe the following points:

Wrapped instruments: The correct position is crucial

Ideally, sterilisation packaging made of film and paper should be positioned vertically in a holder - with paper against paper and film against film. If this is not possible, place the packaging flat on the tray with the paper side down, overlapping by a maximum of one third. Make sure that the sealed seam does not open - this could indicate that the packaging is too small.

Unwrapped instruments: make room for the steam

Unpackaged instruments should lie loosely on the trays without touching each other so that the steam can flow around them completely. Larger instruments or those with cavities should be placed in such a way that the condensate can drain away unhindered.

The correct sequence: think from top to bottom

There is a clear rule for loading the autoclave:

  • Top: Textiles and light packaging made of paper and transparent film

  • Centre: Wrapped instruments

  • Bottom: Unwrapped instruments and heavy loads such as sterilisation containers and containers

This arrangement ensures optimum steam distribution and prevents uneven drying.

Why is it so important to load the autoclave correctly?

The correct loading of an autoclave is crucial for safe and efficient sterilisation. Incorrect loading patterns can impair steam penetration, make drying more difficult and, in the worst case, jeopardise patient safety. But how do you load an autoclave optimally?

In this article, you will learn what is important when loading MELAG autoclaves, which typical errors should be avoided and which best practices ensure reliable sterilisation. Always follow the manufacturer's instructions in the operating manual, as only a correctly loaded sterilisation chamber guarantees perfect results. Let's work together to eliminate the most common stumbling blocks and ensure maximum hygiene in your practice or clinic.

The basic rules for loading the autoclave correctly

  1. Avoid overloading: Overloading hinders the circulation of steam. Ensure that there is sufficient space between the instruments and adhere to the maximum weight specified in the user manual for wrapped and unwrapped instruments and textiles.

  2. Position test specimens correctly: Check the sterilisation conditions regularly using Helix test specimens or type 5 indicators. Place the test specimens exactly according to the reference load in the validation report.

  3. Use perforated aluminium trays: These promote condensate drainage and improve drying. Avoid paper tray inserts, as they can lead to poor drying results in modern autoclaves.

  4. Position sterilisation containers optimally: Use stacking feet to place containers on top of each other without a holder. This leaves sufficient space for steam to enter and effective sterilisation.

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Conclusion: Loading an autoclave correctly

Loading your autoclave correctly is the key to safe and efficient instrument reprocessing. By following the above guidelines, you will not only improve sterilisation quality, but also protect your patients.

Would you like to learn more about optimal loading patterns? Contact us for a personalised consultation >