ISO 9852:2007 is an international standard that specifies a test method for determining the resistance of unplasticized poly(vinyl chloride) (PVC‑U) pipes to dichloromethane at a specified temperature (DCMT).
The purpose of the test is to assess the material quality of PVC‑U pipes, particularly their resistance to chemical attack and the degree of gelation (fusion) achieved during processing. The result provides an indication of whether the pipe material meets specified requirements for integrity and performance.
Details on implementation and scope
The standard applies to PVC‑U pipe specimens and defines the preparation, test temperature, exposure conditions, and evaluation criteria.
The test involves exposing the pipe surface to dichloromethane under controlled conditions and observing any visible effects such as attack, softening, or surface damage. The outcome indicates whether the material has been properly processed and meets quality requirements.
ISO 9852 is commonly used in type testing and quality control to verify consistency in PVC‑U pipe production.
Main benefits for the pipe industry
ISO 9852 provides a simple and repeatable method for verifying the quality of PVC‑U pipe material. It helps manufacturers ensure proper processing conditions and detect insufficient gelation or defects.
Takeaway
ISO 9852 plays an important role in confirming the material integrity of PVC‑U pipes through dichloromethane resistance testing.
Setting up the test
The test begins with preparation of pipe specimens and controlled laboratory conditions.
Test procedure according to ISO 9852
The test consists of applying dichloromethane to the pipe surface for a defined period at the specified temperature.
Assessing test results
After exposure, the specimen is examined for surface attack or deterioration.
Critical execution points
Reliable results depend on strict control of test conditions and correct handling.
Summary
ISO 9852 enables objective assessment of PVC‑U pipe material quality through resistance to dichloromethane.
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