160 In regards to weatherproof of PP Pipe & Fittings, even though the extension ratio was lowered due to an influence of the deterioration part on the surface, the tensile strength was not lowered from the measurements of tensile strength and extension ratio after an acceleration test by Sunshine Weather Meter. Therefore, it is expected to have equivalent or longer service life than PVC. However, it is recommended, as a basic installation method, to provide an appropriate covering for the exposed piping area where direct sunlight hits. - Acceleration Test Data by Sunshine Weather Meter - Outside Exposure Equivalent Duration (year) 0 50 40 30 20 10 0 0 600 1,200 1,800 2,400 0 600 1,200 1,800 2,400 60 70 500 400 300 200 100 0 1 2 3 4 Outside Exposure Equivalent Duration (year) UV Irradiation Time (Hour) UV Irradiation Time (Hour) 0 1 2 3 4 Tensile strength (MPa) Tensile Elongation (%) PVC PP PVC PP Test Method: JIS K 7350-2 "Exposure Test using Plastic-Experiment Room Light Source" JIS K 7113 "Plastic Tensile Test Method" (Reference) Surface Deterioration Thickness after Acceleration Test UV Irradiation Time (Hour) 600 1,200 1,800 2,400 Surface Deterioration Thickness (mm) 0.2 0.2 0.2 0.2 * Data above are experimental values and do not guarantee the performance. Weatherproof Technical Document