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".
The National Technical Committee for Standardization of Plastic Products (CSBTS/TC48) was established in 1984 by the National Standardization Administration Committee (formerly the National Bureau of Standards). Entrusted by the National Standardization Administration of China, TC48 is responsible for the work of national standards and industry standards for plastic products and the management of technical know-how, and at the same time undertakes technical counterpart work with international standards organizations. The Secretariat of the National Plastics Product Standardization Technical Committee (TC48) is located in the Light Industry Plastics Processing Application Research Institute. There are three sub-technical committees under TC48. The third sub-technical committee TC48/SC3 is a technical committee for plastic pipes, fittings and valves. It is responsible for organizing the revision and revision of national standards and industry standards for domestic plastic pipe products. /TC138 [Technical counterparty of the Standardization Technical Committee for Plastic Pipes, Fittings and Valves for Fluid Transportation], responsible for the presentation of relevant international standard technical documents and participation in relevant meetings of international standards. In the work related to the revision of national standards and industry standards, the SC3 Technical Committee conscientiously implements the national policy of “actively adopting international standards†and “actively promoting the metric series†to promote the national standards and industry standards in this field. The revision work is in line with international standards.
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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