EN ISO 9852:2017 PDF

Name: EN ISO 9852:2017 — Unplasticized poly(vinyl chloride) (PVC-U) pipes - Dichloromethane resistance at specified temperature (DCMT) - Test method (ISO 9852:2007)
SKU: EN ISO 9852:2017
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Unplasticized poly(vinyl chloride) (PVC-U) pipes - Dichloromethane resistance at specified temperature (DCMT) - Test method (ISO 9852:2007)

Название (английский):

EN ISO 9852:2017

Unplasticized poly(vinyl chloride) (PVC-U) pipes - Dichloromethane resistance at specified temperature (DCMT) - Test method (ISO 9852:2007)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 14
Дата публикации:: 18 октября 2017 г.
Издание:: CEN EN 9852 edition 2 version 1
ICS:: 23.040.20

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Описание (английский):

ISO 9852:2007 specifies a method for determining the resistance of unplasticized poly(vinyl chloride) (PVC-U) pipes to dichloromethane at a specified temperature (DCMT). It is applicable to all PVC-U pipes, irrespective of their intended use. The method can be used as a rapid means of quality control during manufacture.

Abstract

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Упомянутые в описании и другие стандарты EN

Overview

EN ISO 9852:2017 / ISO 9852:2007 defines a standardized test method (DCMT) to determine the resistance of unplasticized poly(vinyl chloride) (PVC‑U pipes) to dichloromethane at a specified temperature. Adopted by CEN, this method is applicable to all PVC‑U pipes regardless of intended use and is intended as a rapid quality‑control test during manufacture. The test helps assess the level and homogeneity of PVC gelation, which relates to mechanical and long‑term pipe performance.

Key topics and technical requirements

Principle: A chamfered test piece of PVC‑U pipe is immersed in dichloromethane for (30 ± 1) min at a temperature T specified by the referring standard to verify the absence of attack.

Sample preparation:

Test pieces are typically 160 mm long; number of pieces (commonly three) and minimum wall thickness are set by the referring standard.
One end is chamfered; chamfer angle depends on wall thickness (specified in the standard).
Large pieces may be cut longitudinally into sections (saw blade max width 2.5 mm).

Immersion and apparatus:

Use a small glass or stainless‑steel container with a grating and lid, temperature control and stirrer, and a fume‑hood with extraction.
Dichloromethane layer covers chamfered zone; covered by a deeper water layer (preferably 250–300 mm, not less than 20 mm) to limit evaporation and allow dripping after immersion.
Maintain dichloromethane temperature at (T ± 0.5) °C; the standard sets a minimum test temperature (not less than 12 °C).
Refractive index of dichloromethane should be known and monitored.

Safety:

Dichloromethane has low boiling point and toxic vapour; ventilation, fume extraction and safe handling of contaminated test pieces are required.

Results:

Inspection for whitening, precipitate or other attack after controlled drying; optional descriptive reporting of attack (Annex A).

Applications

Quality control during manufacture of PVC‑U pipes to confirm resistance to dichloromethane at a given temperature (DCMT).

Material assessment: indication of gelation quality and homogeneity, which correlate with long‑term mechanical performance.

Type testing and compliance when a referring product standard specifies a DCMT requirement.

EN ISO 9852:2017 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications

Who uses this standard

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