SIST EN ISO 9852:2018 PDF

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.

Who uses this standard

• PVC‑U pipe manufacturers and production quality labs
• Independent testing laboratories and certification bodies
• Product specifiers, procurement engineers and regulators concerned with plastics pipe durability
• Standards committees and R&D teams evaluating PVC processing and formulation

Related standards

• EN ISO 9852:2017 is the CEN adoption of ISO 9852:2007 and supersedes EN 580:2003. The method is referenced by product‑specific PVC‑U pipe standards that define the test temperature, minimum wall thickness and acceptance criteria.