This standard specifies the method for determining the reference density of polyethylene pipes and fittings. Polyethylene pipes and fittings for a variety of applications, including the addition of antioxidants or the stability necessary to achieve the desired service life.
This standard refers to the international standard ISO 4451 - 1980 "polyethylene pipe and pipe fittings - determination of the reference density of colorless and black polyethylene".
1 definition
Reference Density of Polyethylene Pipe and Fittings: Density measured at 23 ° C after treatment of the samples in accordance with the conditions specified in this standard.
2 sample
2.1 sample equipment
According to the provisions of GB 1033-86 "Testing methods for plastic density and relative density", select the appropriate measuring method, and cut three samples from the pipe or pipe according to the shape and size of the sample specified by the selected method.
2.2 Pretreatment of the sample
Pre-treat the sample in an oven with a blower as follows:
The samples were placed in an oven at 150 ± 2 ° C for 1 h. The sample was cooled in an oven at 5 ± 0.5 ° C / h until the temperature dropped to 40 ° C, and the sample was taken out to naturally cool to 23 ° C.
3 Determination of density
The sample density was measured at 23 ± 0.5 °C using the appropriate method specified in GB 1033-86. The test results were accurate to the third decimal place.
4 results are expressed
4.1 The results of the measurements are expressed in terms of the arithmetic mean of the three patterns.
4.2 The measurement results shall be described in accordance with the conditions specified in this standard, and the selected measurement method shall be described.
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