There are many factors to consider when selecting a weathering test station to conduct a test program. These can be summarized into two categories:
For direct exposure the specimen is mounted on the exposure frame open backed or solid backed, and subject to all atmospheric effects. This type can be used at a number of exposure angles. The standard angles used are 45, 5, and 90 degrees, these angles being referenced from a horizontal angle of 0 degree. The angle chosen should be one that matches as closely as possible the position of the end use of the material. The racks should be cleaned on a regular basis to remove mildew and algae if these contaminate producers are present on the test site.
To see a picture of the rural marine atmosphere exposure rack at Dockyard Laboratory (Pacific), 'click here'.