UNE-EN 13060 (the Spanish adoption of EN 13060) defines three classes of small steam sterilizers. Class B is recommended for all dental practices and mandatory for tattoo and piercing studios that sterilize hollow or wrapped instruments. Choosing the wrong class means your instruments may not be sterilized — even if the autoclave report says the cycle passed.
UNE-EN 13060, the Spanish transposition of the European standard EN 13060, defines three classes of small steam sterilizers based on their ability to process different load types. Class B (Big autoclave) handles all loads: solid, wrapped, hollow, and porous instruments. Class N (Naked) handles only solid unwrapped instruments. Class S (Specified) handles specific loads defined by the manufacturer -- its capabilities vary from model to model.
The fundamental difference is the vacuum system. Class B autoclaves use a fractionated pre-vacuum that evacuates air from the chamber and from internal channels of hollow instruments before injecting steam. Without this pre-vacuum, steam cannot penetrate the lumens of hollow instruments (turbines, contra-angle handpieces, cannulae) -- trapped air creates unsterilized pockets.
In Spain, Class B is effectively mandatory for dental practices. Real Decreto 1594/1994 requires systematic sterilization of all reusable instruments, and dental turbines, contra-angle handpieces, and ultrasonic scaler tips are hollow instruments that only Class B can reliably sterilize. Real Decreto 192/2023, implementing the EU Medical Devices Regulation (MDR), reinforces the requirement that reprocessing of medical devices must follow validated procedures -- for hollow instruments, this means Class B.
For podiatrists, Class B is recommended for hollow instruments used in invasive procedures such as nail surgery. For tattoo artists and piercers, autonomous community decrees require sterilization but most do not specify the class -- in practice, Class B is strongly recommended whenever reusable hollow instruments (tubes, grips with channels) are used. Class N may suffice if all instruments are solid and unwrapped, but this significantly limits practice.
Class N autoclaves sterilize only solid, unwrapped, non-hollow instruments. This means instruments must be used immediately after the cycle -- they cannot be stored in pouches. For a dental practice, this is insufficient: instruments must be wrapped to maintain sterility until use. For a tattoo studio using only solid tubes without pouches, Class N is technically acceptable under most community decrees -- but Class B remains recommended for the versatility it provides.
Class S autoclaves have capabilities defined by the manufacturer. Some models handle wrapped loads but not hollow instruments. Others handle certain types of hollow loads. It is essential to check the exact manufacturer specifications and ensure they cover the instrument types used in your practice. When in doubt, Class B is the safe choice -- it covers all load types without exception.
Regardless of class, every cycle must be validated. The Bowie-Dick test verifies steam penetration for Class B autoclaves -- it must be performed daily before the first load. The Helix test is specifically designed to validate sterilization of hollow instruments. A failed test means the load is not sterilized, regardless of what the cycle report shows.
For details on mandatory controls, see the biological controls guide. SecuSteri tracks cycles from all autoclave brands (W&H, Melag, Euronda, Castellini, Tuttnauer, and others) -- regardless of class.
Dental practice: Class B effectively mandatory (hollow instruments, wrapped loads, prion cycle). Podiatrist: Class B recommended (hollow instruments in invasive procedures). Tattoo artist and piercer: Class B recommended if reusable hollow instruments are used, Class N acceptable if only solid unwrapped instruments. Permanent makeup: Class B recommended (dermograph handpieces with hollow components).
To understand what your traceability sheet must contain after each cycle, see the traceability sheet guide.
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