ASTM F412 defines the thermoplastic pipe material designation as:
code, thermoplastic pipe material designation— letters and
ciphers for the designation of stress-rated thermoplastic
compound, which consists of two or more characters to
indicate the abbreviation as listed in Terminology D1600, for
the type of thermoplastic resin—followed by four or five
Arabic numerals— two or three to describe the short-term
properties, in accordance with the ASTM standard being
referenced, and two to designate the hydrostatic design stress
when tested in water at 73°F (23°C)
Date Initiated: 01-09-2024
Technical Contact: Greg Goble