ASTM D5421-05(2010) - 1.11.2010
 
1. Scope

1.1 This specification covers circular contact-molded fiberglass reinforced-thermosetting-resin flanges for use in pipe systems and tank nozzles. Included are requirements for materials, workmanship, performance, and dimensions.

1.2 Flanges (see Fig. 1) may be produced as integral flanges, Type A, or flange-on-pipe, Type B.

1.3 This specification is based on flange performance and does not cover design.

 
2. Referenced Documents

D3754-24

Standard Specification for “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Sewer and Industrial Pressure Pipe

D3517-24

Standard Specification for “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pressure Pipe

D3299-26

Standard Specification for Glass-Fiber-Reinforced Thermoset Resin Corrosion-Resistant Tanks

D3262-26

Standard Specification for “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Sewer Pipe

D2997-21

Standard Specification for Centrifugally Cast “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe

D2996-23

Standard Specification for Filament-Wound “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe

D4097-19

Standard Specification for Contact-Molded Glass-Fiber-Reinforced Thermoset Resin Corrosion-Resistant Tanks (Withdrawn 2026)

B?18.21.1

Type A Narrow Washers

D1600-18

Standard Terminology for Abbreviated Terms Relating to Plastics (Withdrawn 2024)

B?16.1

Cast Iron Pipe Flanges and Flanged Fittings

B?16.5

Pipe Flanges and Flanged Fittings

D1599-18(2024)

Standard Test Method for Resistance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and Fittings

D883-26b

Standard Terminology Relating to Plastics (Includes all amendments and changes 8/24/2026).

C582-23

Standard Specification for Contact-Molded Reinforced Thermosetting Plastic (RTP) Laminates for Corrosion-Resistant Equipment