Plastic Crystal Watches

Didn't we not just love chemistry at school for catchy names like this: polymethyl methacrylate (PMMA for short) is the correct name for the material of which plastic crystals for watches consist. More common are the names of the variants of PMMA: acrylic glass and – derived from the trademarked name "PLexiglas" – plexiglass. Plastic crystal is lightweight and relatively robust. The biggest drawbacks are its limited water resistance due to osmosis, low hardness and high sensitivity to scratches – even if minor damage to the surface can be easily removed by polishing. Nevertheless, the material properties are worse than with mineral and sapphire crystal. Therefore, wristwatches with plastic crystal today can almost only be found in the lower price segment.

Kunststoffglas Uhren
Kunststoffglas Uhren

Plastic Crystal Watches

Didn't we not just love chemistry at school for catchy names like this: polymethyl methacrylate (PMMA for short) is the correct name for the material of which plastic crystals for watches consist. More common are the names of the variants of PMMA: acrylic glass and – derived from the trademarked name "PLexiglas" – plexiglass. Plastic crystal is lightweight and relatively robust. The biggest drawbacks are its limited water resistance due to osmosis, low hardness and high sensitivity to scratches – even if minor damage to the surface can be easily removed by polishing. Nevertheless, the material properties are worse than with mineral and sapphire crystal. Therefore, wristwatches with plastic crystal today can almost only be found in the lower price segment.


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