First, the geotextile was exposed separately to some laboratory degradation tests (single exposure): immersions in liquids, thermooxidation, and artificial weathering
(description of the tests in the following points).
It is clear that common accelerated artificial weathering
methods can lead to the wrong conclusion, especially when going to the most durable paint systems.
Key words: artificial weathering
, color measurement, fir, larch, Norway spruce, wood modification
The printed labels are exposed to artificial weathering
, tape removal and abrasion resistance tests to ensure they are capable of withstanding the harshest environments and prove their durability.
Effect of Artificial Weathering
on the Wood Impregnated with Nano-Zinc Oxide.
This was the case both for the specimens exposed to the heat ageing and those subjected to the artificial weathering
. The discoloration has been suggested to be associated with the generation of light absorbing products, e.g., [alpha], [beta]--unsaturated ketones (3), (9).
The exposure duration of a few hundred hours of artificial weathering
still left the materials within the induction time; the actual main loss in properties like gloss and haze retention only occurs at about 3000 hr of artificial weathering
(1) Therefore, an attempt was made to combine artificial weathering
with CL--a technique that could reduce the usual exposure duration of 2000 h by at least half.
Patent Number 6,626,052, "Method and Apparatus for Artificial Weathering
," was assigned to two NIST scientists on Sept.
Types of testing Two basic test methods are available: long-term, real-time testing outdoors; and accelerated and artificial weathering
, both indoors and outdoors.