ISO 9852 Methylene chloride soak test, Dichloromethane resistance test

Information on the most widely used ASTM standards within the materials testing industry

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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 specifies a chemical attack / solvent-sensitivity test for PVC-U pipes using dichloromethane (CH₂Cl₂, DCM) at a controlled low temperature as a proxy for assessing gelation quality and homogeneity of the PVC-U material.

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

A 160 mm long piece of PVC-U pipe is chamfered at one end (angle depends on wall thickness). The chamfered zone is immersed in dichloromethane held at a specified temperature T (set by the referring standard, T ≥ 12 °C) for (30 ± 1) minutes. After immersion, the test piece is lifted so it sits in a water layer above the DCM for 10–15 min to let DCM "drip" off, then removed and air-dried in a ventilated area. Finally, the chamfer surface is visually inspected for attack (whitening, swelling, pitting, loss of material, precipitate).

ISO 9852 Methylene chloride soak test, Dichloromethane resistance test

Why DCM works as a probe:

DCM is a good solvent for un-gelled / poorly fused PVC domains

Properly gelled (fused) PVC-U has a coherent, cross-linked-like physical network of micro-crystallites in a continuous amorphous phase → resists solvent penetration

Under-gelled material shows surface whitening (micro-voiding/solvent ingress) or material removal → direct visual flag of process defect.

Test Specimen information:

Length	160 mm, ends cut perpendicular to pipe axis.
Number of test pieces	Normally 3 specimens
Chamfering	One end of each piece is chamfered by cutting (≠ grinding) over the entire wall thickness (e), without generating appreciable heating. e < 8 mm: 10° 8 ≤ e < 16 mm: 20° 16 ≤ e: 30°
Oversized pipes	If pipe / piece too large for container, Cut each test piece into the lowest possible number of longitudinal sections using a saw blade max 2.5 mm wide.

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

ISO 9852 Dichloromethane resistance test Equipment configuration requirements:

Chamfering machine	For cutting the chamfer (cutting action, not grinding; no overheating)
Container	Glass or stainless-steel, sized to hold ≥1 test piece; has a grating positioned ~10 mm above bottom; needs a lid to limit evaporation; temperature-control + stirrer maintaining (T ± 0.5) °C; cooling capability. A cylindrical container slightly > 315 mm diameter is suggested but chosen to suit the pipe size produced. Larger pipes can be sectioned longitudinally to fit.
Cooling equipment	Capable of cooling DCM down to the referring standard's specified temperature T (T ≥ 12 °C)
Fume hood	Mandatory — hood with fume extraction over the container (DCM is toxic, high vapour pressure, can be absorbed through skin/eyes; TLV/MAC = 100 mL/m³ = 100 ppm)

ISO 9852 Test Procedure (Step-by-Step):

1, Prepare test pieces — Cut 160 mm lengths, chamfer one end to the correct angle (Table 1), cool to ambient.

2, Set up bath — Fill container with DCM to cover chamfered zone. Cover DCM with water layer (250–300 mm preferred). Start temperature control + stirrer; stabilize at (T ± 0.5) °C (T ≥ 12 °C).

3, Load — Using tongs/gloves, place each test piece so the chamfered zone is fully immersed in DCM (pieces sit on the grating).

4, Immerse — (30 ± 1) min exposure.

5, Drip-off — Raise grating so pieces sit in the water layer (chamfer surrounded by water, no DCM contact) for 10–15 min.

6, Remove & dry — Take pieces out; air-dry in ventilated area / under hood ≥ 15 min until water gone.

7, Inspect — Visually examine chamfer surface for attack (whitening, swelling, pitting, erosion, precipitate).

8, Repeat for remaining pieces.

Test Stipulations:

No heating during chamfering; cutting only (no grinding).

Minimize DCM volume and cover with water to cut evaporation >90%.

Temperature control strict: T ±0.5 °C, ≥12 °C.

Handling: No direct hand contact with DCM or wet specimens.

Valid result: Attack only on the chamfered zone is evaluated; swelling alone is not failure.

Result expression:

No sign of attack anywhere on piece/sections (swelling alone excepted)	"No attack"
Any sign of attack	"Attacked" — optionally describe appearance & location; Annex A gives a semi-quantitative method: estimate attacked fraction as % of chamfer surface width and/or % in circumferential direction, rounded to nearest 5%

No sign of attack anywhere on piece/sections (swelling alone excepted)

"No attack"

Any sign of attack

"Attacked" — optionally describe appearance & location;

Annex A gives a semi-quantitative method: estimate attacked fraction as % of chamfer surface width and/or % in circumferential direction, rounded to nearest 5%

Related Standard:

ISO 9852	Unplasticized poly(vinyl chloride) (PVC-U) pipes — Dichloromethane resistance at specified temperature (DCMT) — Test method
EN 580	Plastics piping systems - Unplasticized poly(vinyl chloride) (PVC-U) pipes - Test method for the resistance to dichloromethane at a specified temperature (DCMT)
GB/T 13526	Unplasticized polyvinyl chloride(PVC-U) pipes dichloromethane resistance test method

Methylene chloride tester/Dichloromethane soak testing machine is used to determine the resistance of unplasticised polyvinyl chloride (PVC-U) pipes to dichloromethane (methylene chloride) at a specified temperature (DCMT).

Q1: What is the ISO 9852 test used for?

A: It measures the resistance of PVC‑U pipes to dichloromethane (DCM) at a specified temperature, to evaluate the gelation level and homogeneity of the PVC‑U material.

Q2: What materials does ISO 9852 apply to?

A: It applies to all unplasticized poly(vinyl chloride) (PVC‑U) pipes, regardless of their application or size.

Q3: Why is the DCMT test important for PVC‑U pipes?

A: The test is a proxy for extrusion gelation quality. Properly gelled PVC‑U resists DCM; under‑gelled material whitens, swells, or erodes. Since gelation directly affects mechanical strength, long‑term performance, and chemical resistance, DCMT provides a fast, inexpensive early warning of process or formulation problems that could lead to pipe failure in service.

Q4: Can the test be performed on plasticized PVC (PVC‑P) or CPVC?

A: No. ISO 9852 is specifically for unplasticized PVC (PVC‑U). Plasticized PVC contains additives that drastically change solvent response, and CPVC has different chemical resistance; other test methods apply

Q5: How does the water layer reduce DCM consumption?

A: The water layer acts as a vapour barrier, preventing DCM evaporation. By minimizing the exposed DCM surface and using a small container (often nested inside a larger water‑filled vessel), the amount of DCM needed per test drops dramatically while maintaining temperature control and safety.

Q6: What if my pipe is too large for the container?

A: Cut each 160 mm test piece into the minimum number of longitudinal sections that fit, using a saw blade no wider than 2.5 mm. Test all sections; the result for that piece is based on the combined observation.

Q7: Can I touch the specimen with bare hands during testing?

A: No. DCM is harmful by skin contact; always use tongs and chemical‑resistant gloves.

Q8: How to check if dichloromethane is still usable?

A: Monitor its refractive index. The change must not exceed +0.002 from the initial value.

Q9: What should be included in the test report?

A: Standard reference, pipe identification, test temperature, number of specimens, result (No attack / Attacked), and any influencing factors.

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