8 EPT058613 Issue 1 March 2020
Laser Radiation
Laser radiation can pose a risk to eyes and skin. The danger is not only posed by direct
laser radiation, but also by scattered radiation and reflections from the work piece or the
packaging machine. The degree of injury depends on the duration of the effect, the power
and the wavelength of the laser.
Lasers and their installations are classified into seven laser protection classes, depending
on their potential danger. Class 1 is the safest and Class 4 is potentially the most harmful.
These classes are defined in detail in EN60825 Part 1 and are summarised below:
AIMING BEAM / PILOT LASER
The system contains an aiming beam with a wavelength of 630nm to 670nm.
This laser is a class 3R laser with an output power of up to 5 mW.
HARMFUL DUST AND VAPOURS
When radiating materials by means of a laser, harmful dust and vapours can be produced.
The user is responsible for appropriate measures, e.g. an exhaust system, to reduce such
harmful dust and vapours to a level that complies with the allowed maximum concentration
of pollutants at the work place.
Class 1 The accessible laser radiation may be visible or invisible and is harmless.
Class 1M The accessible laser radiation may be visible or invisible and is harmless,
provided additional optical instruments are not used.
Class 2 The accessible laser radiation is visible and is harmless for accidental
exposure to eyes for periods of less than 0.25 seconds.
Class 2M The accessible laser radiation is visible and is harmless for accidental
exposure to eyes for periods of less than 0.25 seconds, provided additional
optical instruments are not used.
Class 3R The accessible laser radiation may be visible or invisible. It is potentially
harmful to eyes.
Class 3B The accessible laser radiation may be visible or invisible. Direct radiation is
harmful to the eyes and skin although diffuse radiation (reflected from a matt
surface) is harmless.
Class 4 The accessible laser radiation may be visible or invisible. Direct and diffuse
radiation is extremely harmful to eyes and skin and can pose a fire risk if
projected onto combustible materials.
The F-Series laser marking systems, taken by themselves, are Class 4 and
must not be used until suitable, interlocked guarding is fitted to achieve a
Class 1 laser installation that physically prevents access to the laser
radiation or automatically disables the laser when access is required to the
marking area (for cleaning or maintenance, etc.).