AWWA F101:2019 pdf download.Contact-Molded, Fiberglass- Reinforced Plastic Wash-Water Troughs and Launders
4.2.3 UItraviolet stabilizers. Ultraviolet (UV) stabilizers, whether in the form of inorganic pigmentation, UV absorbers, or energy transfer agents, are required in laminates exposed to UV light. In both of the following options, tensile tests shall be performed in accordance with ASTM D638 using Type I specimens, 0.25 in. (6.4 mm) thick or less, and reported values shall be based on pre exposed section thickness. Flexural tests shall be performed in accordance with ASTM D790, using specimens with a nominal depth of 0.25 in. (6.4 mm) or less and support span-to-depth ratio, L/D = 16. Reported values shall be based on pre- exposed section depth. One of the following options shall be used for testing:
Option 1: The laminate shall exhibit no more than 2 percent deterioration of flexural and tensile properties after 1,000 h of exposure in a Type E, single open- flame, sunshine carbon arc lamp apparatus, as detailed in ASTM G152.
Option 2: The laminate shall exhibit no more than 2 percent deterioration of the average flexural properties or the average tensile properties, listed in Table 1, as measured before and after 1 ,000 h of exposure as tested in accordance with ASTM G155, Test Method A, using optical Filter A.
4.3.1 Construction. The laminate comprising the structure shall consist of a molded or inner surface, a structural layer, and an exterior or outer surface, with integral metallic structural elements as required.
4.3.1.1 Inner surface. The molded or inner surface (inside the trough) shall be one of the fllowing systems:
a. A resin-rich layer, 0.010- -0.020 in. (0.25- -0.50 mm) thick, reinforced with a Type C veil surfacing mat or an organic fiber surfacing material in accordance with Sec. 4.2.5.1. This resin-rich layer shall contain less than 20 percent, , by weight, of the reinforcement material.
b. A gel-coat consisting of a resin layer of 0.015- -0.020 in. (0.38- 0.50 mm) thickness may be used instead of that listed in Sec.4.3.1.1 (a). Acceptable commercial gel-coat resins must have been tested and proven in fabrications as being suitable for contact with potable water.AWWA F101 pdf download.