DME University

Optical Quality

Optical is a term referring to the relationship between light and vision. Five optical properties that can be measured are clarity, color, refraction, haze and luminous transmittance.

  • Clarity can be defined as either being transparent, opaque, or translucent.
  • Color is a basic requirement for plastic parts for which plastic resin lends itself well.
  • Refraction refers to bending of light waves as it passes obliquely from one medium to another medium of different density. The refractive index is used as a purity measurement and for optical design.
  • Haze and Luminous Transmittance are tests to measure the light transmitting properties of clear plastic.

Molding Solutions:

  • To mold an optical part, the cavity/core surface must be of optical quality! Course 6 covers this topic.
  • Avoid anything that may cause stress. The temperature differential across the entire mold surface must be as small as possible to prevent stress.
  • To avoid splay, there can be no moisture in the molding resin.



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