Weather Resistance

Organic compounds, including thermoplastics, degrade over time by being exposed outdoors.
This is mainly because the UV (ultraviolet) rays in sunlight damages polymer chains by its energy, creating highly-reactive sets of atoms (known as "radicals"), and these radicals continues to damage polymer structures further by the process called "Autoxidation".

Moisture in atmosphere accelerates this process by supplying more oxygen atoms to the system, helping Autoxidation, and with another different mechanism of polymer degradation, called Hydrolysis.

Techno Polymer offers special types of styrenic polymers suitable to this unforgiving conditions: Techno AES and Techno ASA.
These resins substitutes especially UV vulnerable parts of ABS polymer with more UV stable substances, along with added UV absorbing agents, resulting in significantly improved weather resistance while keeping excellent properties balance of original ABS polymer.

For more detail about above materials, please contact us.


 
General Properties of Thermoplastics
  AES ASA ABS GPPS HIPS PP PC
Impact Resistance 3 2 3 1 2 3 4
Mold Shrinkage 3 2 3 3 3 1 3
Weather Resistance 4 4 3 3 2 3 3
Chemical Resistance 3 3 3 1 2 4 1
Heat Resistance 3 3 3 2 2 3 4
Appearance 4 4 4 4 3 2 3
Specific Gravity 3 3 3 3 3 4 2
Resin Cost 3 3 3 4 4 4 3

























*NOTE: Above table illustrates general characteristics of various resins.
For the actual performance of a specific polymer grade, please refer to its datasheets supplied by the original manufacturer.

 
Weather Resistance of Resins and Colorants
One important yet often being missed point in terms of weather resistance is the individual consideration of resin and colorant.

Degradation due to UV light first becomes obvious in the resin's appearance. As you may have seen in daily life, plastics exposed outside fade (color saturation lowers), and the surface eventually forms a whitish powder ("chalking").

At this point, the mechanical properties of the plastic parts are more or less the same as before degradation, because the UV lights has only affected a few hundred micrometers depth from the surface. However the color-fade can often be the very problem.
(continue exposing and the degradation goes deeper inside, and eventually the plastic part fails mechanically by cracking, etc.)

To effectively prevent discoloring, weather resistant resins AND weather resistant colorants should be selected. This is usually managed by resin providers, but customers should be aware that "weather resistance" could mean both resistance to color-degradation and resistance to degradation of mechanical properties.
If possible please specify which you are contacting us about.
 
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