This standard describes the minimum requirements for fiberglass-reinfiorced
plastic wash-water troughs and launders made by the contact-molding process,
inclnding flat-bottom, rotmd-bottom, and V-bottom troughs and launders. Require-
ments are included for materials, properties, design, construction, dimensions,
tolerances, work quality, and appearance. This standard also describes thc require-
ments for using general-purpose and chemical-resistant resins. These fabrications are
used in municipal water supply service and industrial water supply service
applications.
1.1.1 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 'l?pe 1, while industrial water supply
service applications may use either ~lyp~ 1 or ~l?pe I1, depending on the environment.
Troughs and launders shall be classified according to type as fbllows:
1.1.l.1 Type I. Fabrications shall bc manuf:acturcd with a polyester resin of
tile orthophthalic or isophthalic fbrmulation, Type I fabrications shall bc nlanufacturcd
of materials suitable for general purpose applications having a tcmt)craturc range not
exceeding 150℉ (83℃).
1.1.1.2 Type II. Fabrications shall bc manufactured with a chemical-
resistant polyester resin, such as vinylcster, bisphcnol-A fi,naratc, or chlorcndic
formulations. Type Ⅱ fabrications shall be manufactured tot chemical-resistant
applications having a tcmperaturc range not exceeding 200℉ (111℃).