ISO 176-1976 Plastics – Determination of plasticizer losses – Activated carbon method

1 Scope of application
This standard specifies two empirical methods for quantifying the loss of plastic volume in the presence of activated carbon and under certain temperature and time conditions.

Method A: The sample is directly connected with the activity, especially suitable for materials that will flow at high temperatures and need to be tested at lower temperatures.

Method B: Put the sample in a metal cage to prevent the sample from directly contacting with activated carbon, which is suitable for materials tested at higher temperatures.

2 Instruments and materials
2.1 Analytical balance, micrometer and constant temperature bath or oven commonly used in the laboratory.

2.2 Sweet, with a diameter of 100mm and a height of 120mm, with a non-sealed return column metal male, and a ventilation hole with a diameter of 3mm can be opened on the male.

2.3 The reinjectable metal cage is made of bronze mesh with a mesh of about 500µm, with a diameter of 60mm and a height of 6mm.

2.4 Activated carbon, particle size is about (4-6)mm, and no powder. It should be screened before use, preferably dry under vacuum at 70℃ to constant weight, and then stored in a sealed container, and new material should be used in each test.

ISO 176-1976 Plastics – Determination of plasticizer losses – Activated carbon method

3 Sample
The sample is a return piece with a diameter of (50 soil 1)mm and a thickness of (1士0.1)mm, which is cut from a press molded piece with the thickness of Fudang.

If tests are to be carried out to determine the characteristics of the plasticizer, the standard temperature compound agreed upon by the parties shall be used.

The method can also be used to determine the reduction of plastic sheeting on fabrics and other base materials. The specimen used should be cut directly from the original sample.

4 Operation steps to be taken
4.1.Method A

4.1.1 Weigh each sample after state adjustment and measure its average thickness.

4.1.2 Lay 12ocm active technology on the bottom of the metal container. Put a piece of sample on the activated carbon, and then use 120cm of active surface. According to this method, the two samples were placed in the container in turn, and 12oem of activity was used to separate each sample. Finally, use a good container.

4.1.3 In order to prevent the plasticizer from infiltrating into other selective compounds from one sample to another, only samples of the same composition should be placed in a container.

4.1.4 Put the container into a constant temperature bath with the temperature controlled at (70 s-1)℃.

4.1.524 hours later, take out the container from the chassis or constant temperature bath, put it in the room temperature to cool, and take out the sample from the container. Brush off the charcoal particles and weigh each into a sample.

4.2.Method B

Except that each specimen should be placed in a small wire cage and the test temperature is (100 S1)℃. The rest is the same as method A.

4.3 For different materials, the parties concerned may agree on different test temperatures and different test durations, but all of them should be in accordance with the above operation steps.

ISO 176-1976 Plastics – Determination of plasticizer losses – Activated carbon method

5 Result Representation

The mass change △m of each sample before and after the test, expressed as mass fraction, was calculated by the following equation:


m0 – Mass of sample before heat treatment,g;

m1 The mass of the sample after heat treatment in an oven or constant temperature bath,g.

The arithmetic mean of the measured values of the three samples was calculated as the amount of plasticizer loss in the tested material.

6 Standard history and standard acquisition situation
This standard was developed by ISO/TC61/SC6 sub-L976, and is now the first edition.

There is no corresponding standard in our country.

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