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利用热循环技术评估压塑聚乙烯(PVC)管道质量的实施规程  
 【英文标准名称】  Standard Practice for Estimating the Quality of Extruded Poly (Vinyl Chloride) (PVC) Pipe by the Heat Reversion Technique
 【原文标准名称】  利用热循环技术评估压塑聚乙烯(PVC)管道质量的实施规程
 【标准号】  ASTM F1057-1987(2005)
 【标准状态】  Active
 【国别】  
 【发布日期】  1987
 【实施或试行日期】  
 【发布单位】  美国材料与试验协会(US-ASTM)
 【起草单位】  F17.40
 【标准类型】  (Practice)
 【标准水平】  ()
 【中文主题词】  聚乙烯管;质量控制;质量;评定;挤压的
 【英文主题词】  heat reversion; PVC pipe
 【摘要】  

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

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

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

2.1.3 Determine whether infused areas are present, and

2.1.4 Reveal contamination.

Note 18212;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 28212;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.

1.1 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.

 【中国标准分类号】  G33
 【国际标准分类号】  23_040_20
 【页数】  7P.;A4
 【正文语种】  
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