This practice is applicable to distinguish between properly and improperly extruded PVC plastic pipe. It can be used to:

Reveal incomplete exsiccation of compound before or during extrusion (Note 1),

Determine the presence of stress in the pipe wall produced by the extrusion process (Note 2),

Determine whether infused areas are present, and

Reveal contamination.

Note 1—Residual moisture in the compound vaporizes at extrusion temperatures and is normally evacuated as it forms vapor. Pockets of moisture trapped in the pipe wall result from incomplete exsiccation of the compound, and may reduce the physical properties of the pipe.

Note 2—Minor residual stress in the pipe will not impair field performance and handleability. High-residual stress has no proven effect on performance, but may impair handleability during installation.

1. Scope

1.1 This practice covers a procedure for estimating the quality of extruded poly (vinyl chloride) (PVC) plastic pipes by observing the reaction of pipe specimens after exposure to hot air in the oven at 180 ± 5°C for 30 min duration.

1.2 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Keywords

heat reversion; PVC pipe; Extrusions; Heating tests--plastics; Heat reversion technique; Poly(vinyl chloride)(PVC) pipe--specifications ;

ICS Code

ICS Number Code 23.040.20 (Plastic pipes)

Citing ASTM Standards

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