Tri-Star M100LFG-TT/150, Owner'S Manual, Page: 60 / 73

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10.5 Contrast and the wire types.
As explained in the chapter 3 only the wire insulations doped with
TiO
2
can be reliably
marked with UV laser. The marking contrast depends both on laser intensity and concentration
of
TiO
2
in the wire jacket. Marking different insulations may result in good or poor marking
quality depending on the material properties. For example, Marking on the Teflon insulated
wires has a grayish/bluish color and cannot be as dark as on Tefzel insulation (Fig.10.6).
Fig.10.6. M100LFG-TT/150 marking on the BMS 13-48 (Tefzel) and
22759/86 (Teflon) (
Green offset marks with wire spec numbers are made during the wire
manufacturing process and used as a reference only
)
Laser markable wires commonly used in the aerospace industry are listed in the table 3.1.
The contrast of a dot for a given type of wire stays the same for as long as laser output does not
change. The marking legibility depends both on the contrast of the individual dot and dots
distribution within outline of a character. The closer are dots to each other the darker is
appearance of the message. The bigger the character the less contrast and lower dot density is
required to produce a legible mark.