This instrument is used for conducting dichloromethane immersion tests on plastic pipes, fittings, sheets, etc. Widely used in the production of pipes, fittings, and sheets, as well as in the inspection and research of construction materials.

Compliant with standards:

GB/T13526Test method for dichloromethane immersion of rigid polyvinyl chloride (PVC-U) pipes.

ISO/DIS9852:Test method for dichloromethane immersion of rigid polyvinyl chloride (PVC-U) pipes.

The main components of the product are:

Composed of a constant temperature water bath, stainless steel container, sample fine pore filter, temperature control and timing system, etc.

Technical indicators:

1Stainless steel container specifications: diameter 350 mm, height 280 mm

2Dichloromethane constant temperature: 20 ± 0.5℃

3Instrument temperature control range: 10-50℃

4Instrument temperature control accuracy: ± 0.2℃

5Instrument display accuracy: 0.1℃

6Timer range: 0-99 minutes

7Timer accuracy: 1 second

Sample standard:

Cut the sample to a length of at least 100mm

Sample method:

1The depth should be such that the sample is submerged at least 30mm

2The thickness of the water seal layer is about 20mm

3The sample is kept at a constant temperature for 20 minutes, and then dried for 15 minutes after removalSerious surface damage (sample cracking, cracking, scarring, etc.)—Surface damage d. S

—Slight change c. M

—No changes or slight changes b. L

—Serious surface damage (sample cracking, cracking, scarring, etc.)

The dichloromethane immersion test is an important testing item for PVC-U pipes, used to characterize the degree of plasticization and uniformity of the pipes. The degree of plasticization of the pipes directly affects their long-term hydrostatic performance and has a direct impact on their service life. Different standards have different requirements for the testing conditions of the pipes.

Reagent:Dichloromethane, analytical purity device: 800 grit sandpaper, constant temperature water tank timer, stainless steel container

Sample:Cut at least 100mm of pipe section from the pipe material, carefully turn the sample section with a right angle lathe without causing the material to heat up as much as possible, and then gently polish it with 800 grit sandpaper to make the section smooth and flat.

Experimental steps:Pour dichloromethane into a container to a depth that allows the sample to be submerged for at least 30mm. Slowly add distilled water to the container to form a 20mm thick water seal layer on the dichloromethane.

Place the container in the thermostatic water tank and adjust the water bath temperature. When the temperature of dichloromethane reaches 20 ± 5℃When placing the sample on the grid and immersing it in a container, or suspending the sample in dichloromethane, the immersion depth of the sample should not be less than 30mm, and the polished surface of the sample should be immersed in the solution. Immerse the sample at a constant temperature for 20 minutes, remove the sample from the container, dry for 15 minutes, and visually inspect the inner and outer surfaces and cross sections of the sample. Measure the length of damage on the inner and outer surfaces and cross sections using a tape measure and vernier caliper, and record all changes.

The results indicate that:The categories of changes are evaluated based on the following levels to assess the quality changes on the surface of the specimen: a. N