Matched-Die-Molded, Fiberglass-Reinforced Plastic Weir Plates, Scum Baffles, and Mounting Brackets
|Publication Date:||24 January 2019|
This standard describes the minimum requirements for fiberglass-reinforce
Exceptions. This standard does not cover weir plates, scum baffles, mounting brackets, lap plates, and cover washers fabricated with the hand layup, sprayup, or flat-sheet machine-cut method.
Classification. Resistance to the corrosive or chemical environment shall be determined prior to molding either Type I or Type II fabrications. Typically, municipal water supply service applications use Type I, and industrial water supply service applications may use either Type I or Type II, depending on the condition of the environment. Weir plates, baffles, and brackets shall be classified according to type as follows:
Type I. Fabrications shall be manufactured with a polyester resin of the orthophthalic or isophthalic formulation. Type I fabrications shall be manufactured of materials suitable for general purpose applications having a temperature range not exceeding 150°F (83°C).
Type II. Fabrications shall be manufactured with a chemicalresistant polyester resin, such as vinyl ester, bisphenol-A fumarate, or chlorendic formulations. Type II fabrications shall be manufactured for chemical-resistant applications having a temperature range not exceeding 200°F (111°C).
The purpose of this standard is to provide the minimum requirements for matched-die-molded, fiberglass-reinforce