Milan — Laser marking liquid silicone rubber was demonstrated at the Silicone Elastomers Summit, sponsored by Smithers Rapra, in Milan.
The demonstration involved REA Jet FL fiber laser marking equipment from Mühltal, Germany-based REA Elektronik GmbH.
The Merck KgaA laser marketing pigments were dispersed in Alpa-LSR 550201 and 550202 laser marking grades from Tübingen, Germany-based CHT Germany GmbH.
The project, which made luggage tags, was produced by Freiberg, Germany-based LSR and thermoplastics molder Antech Polymertechnik.
CHT's laser marking grades have compression set 12, Shore hardness 50A and viscosity 300 mPas at 10/s. But values differ for elongation to break at respectively 380 percent and 300 percent, and tensile strength at respectively 8.5 N/mm2 and 7.5 N/mm2.
Depending on laser beam intensity, markings range from light gray to black, on opaque colored or transparent LSR parts, including deeply engraved marking where required.