The performance of plastic materials in the sun
Many plastic enclosures are designed to be UV stabilised to protect from solar radiation, direct or indirect sunlight. However, UV stabilisation can often have a different meaning to an end user compared with the plastic manufacturers.
To test what happens to plastic when exposed to direct, harsh sunlight, B&R Enclosures put a range of plastic enclosures up on the roof of our factory for a year to see what would happen.
It should be noted that this could be considered a very extreme test as: -
Our factory is located in Brisbane, Australia, one of the areas with the highest UV radiation in the world (see http://www.soda-is.com/maps/WorldUVab.png and http://www.soda-is.com/img/carte_Ed_13_world.pdf for more details).
The largest face of the enclosure is in direct sunlight all the time.
There would be significant reflection from the factory roof which is made from steel.
Our recommendations are as follows:
- Polynova PJ - Direct sunlight causes a yellowing of the material but no structural changes. Can be used when aesthetic concerns are not an issue.
- Polynova PS - Can be used in all cases
- Polynova PC -
- Polynova PM - Direct sunlight causes a yellowing of the material but no structural changes. Can be used when aesthetic concerns are not an issue.
- Polynova PN - Can be used in all cases
- Polynova PD - Do not use without appropriate sun shielding.
Note: The yellowing seen is usually the result of a reaction involving the fire retardants used to make the enclosure safe for indoor usage. There is a method of reversing this reaction. More information can be obtained at http://retr0bright.wikispaces.com/Retr0Bright+Gel