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ISO 9852 Methylene chloride soak test, Dichloromethane resistance test

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


ISO 9852 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.

Scope of application: Suitable for any homogeneous flat-walled, unplasticized PVC pipe, regardless of its intended use, It can be used as a means of rapid quality control in the production process. It is especially suitable for quality inspection and 

performance evaluation of PVC-U pipes. 


Core test principles

The ISO 9852 standard specifies a method for determining the resistance of PVC-U pipes to methylene chloride at specified temperatures (DCMT). This method evaluates the plasticization uniformity and internal structural integrity of the pipe specimen by immersing the pipe specimen in methylene chloride solution and observing the degree of damage to the surface of the pipe after impregnation.


Key test parameters:

parameter

Technical  requirements:

remark

Test temperature

T±0.5℃(≥12℃)

Common 15°C, 20°C or 30°C

Soaking time

30±1   min

Strict control

Sample preparation

Choose the chamfer angle according to the wall thickness (10°-30°)

Avoid mechanical heating

Thickness of the water sealing layer

≥20mm

Reduces reagent evaporation


Dichloromethane resistance test Equipment configuration requirements

The test system must include the following key components:

Stainless steel/glass containers: equipped with double grids (dip bit/drip level)

Temperature control system: accuracy ± 0.5°C

Ventilation system: meets methylene chloride vapor threshold limit (TLV 100ppm)

Protective Gear: Includes gloves and goggles


Relationship with GB/T 13526

The Chinese national standard GB/T 13526-2007 "Test Method for Dichloromethane Impregnation of Rigid Polyvinyl Chloride (PVC-U) Pipes" is equivalent to ISO 9852:2007 international standard. The two are highly consistent in terms of technical content, and the main correspondence is as follows:

Specimen specifications: all are 160mm length (100mm for the 1995 version of ISO  standard).

Impregnation time: 30 minutes (20 minutes for GB/T 13526-1992).

Judgment method: The qualitative determination of the degree of failure, the percentage of failure of the inclined surface and the percentage of failure in the      circumferential direction are calculated.

Specimen angle: Determine the inclination angle according to the wall thickness of the pipe.

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