Recent changes to ASTM F441 and F442 assert a four digit material abbreviation for CPVC. As an example, section 3.2.4 of ASTM F441 states standard thermoplastic pipe materials designation codeThe pipe materials designation code shall consist of the abbreviation CPVC for the type of plastic, followed by the ASTM type and grade in Arabic numerals and the design stress in units of 100 psi (0.7 MPa) with any decimal figures dropped. . . Thus a complete material code shall consist of four letters and four figures for CPVC plastic pipe materials (see Section 5).
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