Surface Weatherability

Cured sheets of silicone and NTP sealants (3 mm thickness) were exposed to ultraviolet (UV) light in a Sunshine Weatherometer1 with carbon arc light source (operation conditions: black panel temperature at 63°С, water spray of 18 min duration within a 120 min total cycle) according to JIS B7753: Light – exposure and light-and-water-exposure apparatus (open-flame sunshine carbon-arc type).

After exposure to UV irradiation for 10000 h, no crack on the surfaces of both silicone and NTP sealants can be observed. The surface weatherability test still continues and further results will be reported in future.