ASTM F1057-87(2000)
(Practice)Standard Practice for Estimating the Quality of Extruded Poly (Vinyl Chloride) (PVC) Pipe by the Heat Reversion Technique
Standard Practice for Estimating the Quality of Extruded Poly (Vinyl Chloride) (PVC) Pipe by the Heat Reversion Technique
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 heat.
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.
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An American National Standard
Designation:F 1057–87 (Reapproved 2000)
Standard Practice for
Estimating the Quality of Extruded Poly (Vinyl Chloride)
(PVC) Pipe by the Heat Reversion Technique
This standard is issued under the fixed designation F 1057; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Procedure
1.1 This practice covers a procedure for estimating the 4.1 Preparespecimensofpipe150mm(6in.)longorlonger
qualityofextrudedpoly(vinylchloride)(PVC)plasticpipesby with ends cut square so that they stand perpendicular on end
observing the reaction of pipe specimens after exposure to when placed in the oven.
heat. 4.1.1 Cut staves from pipes whose size prevents insertion of
1.2 This standard does not purport to address all of the full round specimens in the oven. Prepare large-diameter pipe
safety problems, if any, associated with its use. It is the staves so that their lengths parallel to the pipe axis are 150 mm
responsibility of the user of this standard to establish appro- (6 in.) or longer.
priate safety and health practices and determine the applica- 4.2 Examine the specimens and note any unusual features
bility of regulatory limitations prior to use. such as discoloration, inclusions, or pinholes in the cut edge.
4.3 Place the specimens of whole pipe in the preheated oven
2. Significance and Use
so that each specimen stands on end with sufficient separation
2.1 This practice is applicable to distinguish between prop-
between them so that hot air can flow freely between the pipes.
erly and improperly extruded PVC plastic pipe. It can be used Place specimens of pipe staves on the floor of the preheated
to:
ovensothattheyrestontheirlongitudinaledgesandsothathot
2.1.1 Reveal incomplete exsiccation of compound before or air can flow freely around them. Record the time when the air
during extrusion (Note 1),
in the oven recovers to 180°C (356°F). After an additional 30
2.1.2 Determine the presence of stress in the pipe wall min at this temperature, remove the specimens, taking care not
produced by the extrusion process (Note 2),
to alter any heat effects.
2.1.3 Determine whether infused areas are present, and
4.4 Examine the specimens within 3 min after removal from
2.1.4 Reveal contamination. the oven, while still hot. With a sharp knife, cut whole pipe
specimens lengthwise at approximately 60° circumferential
NOTE 1—Residual moisture in the compound vaporizes at extrusion
intervals, resulting in six pipe staves of approximately equal
temperatures and is normally evacuated as it forms vapor. Pockets of
widths. Cut specimens being tested in the form of staves into
moisturetrappedinthepipewallresultfromincompleteexsiccationofthe
compound, and may reduce the physical properties of the pipe. three roughly equal segments. Note the following for the
NOTE 2—Minor residual stress in the pipe will not impair field
report:
performance and handleability. High-residual stress has no proven effect
4.4.1 The shape of the pipe ends and the pipe barrel,
on performance, but may impair handleability during installation.
4.4.2 The condition and appearance of both the inner and
outer surfaces of the material, and
3. Apparatus
4.4.3 The condition and appearance of the cut edges of the
3.1 Air Oven, thermostatically controlled, capable of oper-
material.
ating at 180 6 5°C (356 6 9°F) such that after insertion of the
specimentobetestedthetesttemperatureisregainedwithin15
5. Interpretation
min or less.
5.1 A suggested interpretation of the results observed is
NOTE 3—The oven should be vented to the outside of the building. given in Appendix X1.
6. Report
6.1 Report the following information, where applicable:
This practice is under the jurisdiction of ASTM Committee F17 on Plastic
6.1.1 Information given by the pipe marking, including the
Piping Systems and is the direct responsibility of Subcommittee F 17.40 on Test
nominal size of pipe, the type of pipe, and the date code;
Methods.
Current edition approved July 31, 1987. Published September 1987. 6.1.2 Form in which the pipe was tested;
Copyrigh
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