Quality Control Lab

All tests are performed in the reference laboratory

Multiple tests of materials and PE pipe


Raw material tests


MFR test
Polyethylene granules must be tested in accordance with ISO 9680-1 at 190 ° C and 5 kg weight. After filling the machine with about 3 grams of the material, preheat the material for 4 minutes and then start the test. The machine cuts every two minutes automatically. Since the result of the MFR test is reported (10min / gr), 5 shear weights of the output of the device will indicate the MFR value.
The permissible value in INSO 14427 is reported between 0.15 to 0.7 g / 10 min and does not distinguish between PE100 and PE80, but this is an optimum time for PE100 to range from 0.15 to 0.23. Be it.
OIT Testing
Polyethylene granules must be subjected to oxygen gas injection for 20 minutes at 200 ° C for 20 minutes. During this period, PE should not undergo thermal degradation and oxidation. Although the thermal stability value has been reported for 20 minutes, this test is performed in the laboratory for more than one hour to find out the quality of the raw materials.
Density test
The density of polyethylene granules is also tested in accordance with national standard 1-7090. The permissible value in accordance with INSO 14427 is greater than 0.941 g / cm3.
Percentage Test
If the raw materials are self-priming according to ISO6964, the percentage of soot testing on the raw materials is performed. In this test, 1 g of the material is burned inside the furnace at 10 ° C for 350 min, 10 min at 450 ° C and 30 min at 550 ° C under high purity nitrogen gas to give the percentage of black carbon (soot). ) To be determined. The permissible value in accordance with INSO 14427 is between 2% and 2.5%.
Soot dispersion test
As in section 1.1.1.4, the distribution of raw materials is measured in the event of the introduction of self-priming materials in accordance with ISO 18553. The test is characterized by the preparation of thin films of material and examination by scattering microscopy. The allowable value is reported to be less than or equal to 3 INSO14427 degrees.
ESCR Test
This test must be performed by the raw material manufacturer and specified in the raw material datasheet.

Polyethylene tube tests

MFR test
Polyethylene pipes shall be tested in accordance with ISO 9680-1 at 190 ° C and 5 kg weights. After filling the machine with about 3 grams of the material (the tube is crushed into cubes) preheat the material for 4 minutes and then start test. The machine cuts every two minutes automatically. Since the result of the MFR test is reported (10min / gr), 5 shear weights of the output of the device will indicate the MFR value.
In accordance with INSO14427 standard in multilayer pipes, MFR test is to be performed on each layer separately and the results are recorded for each layer.
OIT Testing
Polyethylene pipes shall be tested for oxygen for 20 minutes at 20 ° C for 20 minutes under oxygen gas. During this time the pipe should not undergo thermal degradation and oxidation.
Density test
The density of polyethylene granules is also tested in accordance with national standard 1-7090. The permissible value in accordance with INSO 14427 is greater than 0.941 g / cm3.
Percentage Test
The permissible amount of soot in PE pipes is between 2% and 2.5% according to INSO 1442. The test shall be carried out in accordance with the procedure referred to in paragraph 1-4. Currently, due to the lack of use of self-priming materials and the use of masterbatches to provide soot in the pipe, this amount is highly dependent on the material being completely mixed by the material.
Distribution and distribution of soot
In accordance with ISO 18553, the distribution of raw material soot is measured. In this test, thin films from 6 different points of the tube are examined and scattered by microscopy. The allowable value is reported to be less than or equal to 3 INSO14427 degrees.
Tensile test
To perform the tensile test, the specimens are first cut by thickness depending on the CNC machine.
Tubes up to 5 mm thick are called Type 2, samples greater than 5 mm thick are Type 1 and specimens more than 12 mm thick are called Type 3.
After placing the specimens in the two jaws of the pulling device, the specimens are drawn at a certain speed. In accordance with INSO 14427, the amount of elongation prior to rupture of the specimen shall be greater than 350%.
Hydrostatic Pressure Test

Polyethylene pipes in accordance with National Standard 12121-1 must withstand a certain pressure over a specified time and temperature.

The test is either carried out at 100 ° C at 20 ° C or 165 ° C at 80 ° C or 1000 ° C at 20 ° C and the pressure applied according to the following formula is calculated for each specified tube.

Longitudinal Back Test

In accordance with ISO 2505 the pipe shall pass the longitudinal return test. A 20cm long tube is selected and its 10cm mark is marked with equal distance from the two ends of the tube. The tube is placed in the oven at 110 degrees Celsius, and after 1 to 2 hours (depending on the thickness of the tube), it is removed and allowed to cool. After cooling the pipe, the length change should not be more than 3%.

Structural integrity testing

In accordance with INSO 14427 standard, on tubes with coextruded layers, structural integrity testing shall be performed after bending ISO 13968.