Weathering and stress tests have proved that PolyCB2 last longer than other insect screen by factors up to ten to one. The secret is not only the ultra strong core of the woven strands, but the exclusive extruded coating surrounding the core. 

This extruded coating prevents solar rays from crystallizing the core fibers. And, biocides in the coating keep the screen free from mildew, mold and other deterioration.
By extruding a coating over the core before weaving, the cross points can then be vulcanized to insure that the screen mesh holds its shape and distributes impact over a large area. This is why PolyCB2 has been able to withstand flying debris from hurricane force winds.
Why inexpensive screens have a short lifespan and fail to withstand harsh conditions.
Fiberglass and so called "tough" screens are dip coated after weaving to shield the core from solar rays. This "cost saving" manufacturing process is only partially effective. 

As the coating dries, small gas bubbles form. With a little aging, the micro fine film over the bubbles break and create void areas and cracks that allow UV rays to attack the core causing it to become brittle. Also, cracks often occur where the woven strands overlap.

Due to dip coating, the woven strands are only held together at cross point by the perforated and cracked outer coating. Upon impact, the core, now solar weakened and having lost its elasticity, snaps and the result is a screen that easily tears.
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