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GB/T 18251-2019: Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin pipes, fittings and compounds Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 18251: Historical versions
Similar standardsGB/T 18251-2019: Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin pipes, fittings and compounds---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT18251-2019 (Determination of the dispersion of pigments or carbon black in polyolefin pipes, fittings and compounds) ICS 83.140.30 G33 National Standards of People's Republic of China Replace GB/T 18251-2000 Polyolefin pipes, fittings and compounds Determination of the dispersion of pigments or carbon black Methodfortheassessmentofthedegreeofpigmentorcarbonblackdispersion Inpolyolefinpipes, fittingsandcompounds (ISO 18553.2002, MOD) Published on.2019-08-30 2020-03-01 implementation State market supervision and administration China National Standardization Administration issued ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 18251-2000 "Determination of the dispersion of pigments or carbon black in polyolefin pipes, fittings and compounds", and Compared with GB/T 18251-2000, the main technical changes are as follows. --- Modify "Microscope. Minimum Magnification × 70" to "with appropriate magnification" (see 3.1.1); --- Increased the dispersion size rating using a 100x microscope (see 4.2.1); --- Increased the dispersion of apparent grades using a microscope with a magnification of at least 70 × (see 4.2.2); --- Modified the sample quality requirements (see 4.1.1.1); --- Increased considerations for the test preparation of tableting methods (see 4.1.1.1); --- Modified the sample width requirement (see 4.1.1.1); --- Modified sample thickness requirements (see 4.1.1.2 and 4.1.2); --- Deleted the microscope model, magnification, increased the thickness of the sample, the average grade of each set of samples and the grade of each sample, each The most representative apparent grade in the set of samples and the apparent grade of each sample, any deviation from the test method details, and Any factor that can affect the outcome, such as bubbles, impurities, etc. produced in the sample (see Chapter 6); --- Revised Table A.1 of Appendix A and added for explanation (see Appendix A). This standard uses the redrafting method to modify the use of ISO 18553.2002 "polyolefin pipes, pipes and blends of pigments or carbon black dispersion Determination of degree. The main technical differences between this standard and ISO 18553.2002 and their reasons are as follows. --- Removed 4.1 "This standard specifies two methods for preparation of samples. tableting method and sectioning method."; --- Refined the description of the apparent grade determination of the sample (see 5.2), added the reference to the informative Appendix D, which is convenient for the standard. use; --- For the details of any deviation from the test method in the test report, and any factors that may affect the results, an example is given (see Chapter 6). This standard also made the following editorial changes. --- Incorporate the amendments to ISO 18553.2002/Amd1.2007 (see 4.2.1), reducing the workload of pellet counting; --- Appendix A Table A.1 added "Note 4. particle size is taken as an integer, the first non-zero digit carry after the decimal point". Please note that some of the contents of this document may involve patents. The issuing organization of this document is not responsible for identifying these patents. This standard was proposed by the China Light Industry Association. This standard is under the jurisdiction of the National Plastics Standardization Technical Committee (SAC/TC48). This standard was drafted. PetroChina Research Institute of China National Petroleum Corporation, Shandong Shengbang Plastic Co., Ltd., Asia Group company, Beijing Beihua High-tech New Technology Co., Ltd., Beijing Building Materials Inspection and Research Institute Co., Ltd. Volume Supervision and Inspection Center), Beijing Yanshan Petrochemical High-tech Co., Ltd., Shanghai Baidie Pipe Technology Co., Ltd., Beijing Industry and Commerce University (Light Industry Plastics Processing Application Research Institute). The main drafters of this standard. Lu Xiaoying, Jing Fazhen, Li Yu, Wang Ning, Li Yizhu, Li Jun, Du Bin, Tang Hui, Xu Haiyun. The previous versions of the standards replaced by this standard are. ---GB/T 18251-2000. Polyolefin pipes, fittings and compounds Determination of the dispersion of pigments or carbon black1 ScopeThis standard specifies the method for determining the size and dispersion of pigments or carbon black particles and granules in polyolefin pipes, fittings and compounds. This standard applies to polyolefin pipes, pipe fittings and compounding. When determining carbon black, this standard is applicable to the aggregation of carbon black mass fraction less than 3%. Olefin pipes, fittings and compounds.2 PrincipleTake a small amount of sample from the tube, tube or pellets and compress it to prepare the sample between the microscope slides. You can also use a slicer to cut the sample. Tablets were prepared for the samples. The sample was observed under a microscope, and the size of the particles and the pellets was measured, and the grade was determined in comparison with the sample classification table (see Appendix A, Table A.1). The dispersion size rating of the particles or pellets is determined by the average of the six sample grades. If a dispersive apparent grade is required, it is determined by comparison with a photomicrograph (see Figure B.1 of Appendix B).3 test equipment3.1 General 3.1.1 Microscope. with appropriate magnification (see 4.2), with a calibrated orthogonal moving scale, capable of measuring the size of particles and granules Inch, its illumination should avoid optical effects. 3.1.2 Slide. thickness is about 1mm. 3.2 Tablet device or instrument 3.2.1 Oven or heating plate or other heating equipment. The temperature is controlled between 150 °C and 210 °C. 3.2.2 Scalpel or other suitable tool. used to cut the specimen. 3.2.3 Pressing, heavy objects or spring clips. to maintain pressure. 3.3 Slicing device or instrument Slicer. A sheet of the specified thickness can be cut (see 4.1.2).4 test process4.1 Sample preparation 4.1.1 Tableting method 4.1.1.1 Cut six specimens along different parts of the product with a scalpel. When measuring pigment dispersion, the mass of each sample is (0.6 ± 0.2) mg. When the carbon black dispersion was measured, the mass of each sample was (0.2 ± 0.10) mg. Place six specimens on one or several clean microscope slides Top, each sample is discharged approximately equidistantly from the edge of its adjacent specimen or slide, and covered with another (or several) clean slides. GB/T 18251-2019 (Determination of the dispersion of pigments or carbon black in polyolefin pipes, fittings and compounds) ICS 83.140.30 G33 National Standards of People's Republic of China Replace GB/T 18251-2000 Polyolefin pipes, fittings and compounds Determination of the dispersion of pigments or carbon black Methodfortheassessmentofthedegreeofpigmentorcarbonblackdispersion Inpolyolefinpipes, fittingsandcompounds (ISO 18553.2002, MOD) Published on.2019-08-30 2020-03-01 implementation State market supervision and administration China National Standardization Administration issuedForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 18251-2000 "Determination of the dispersion of pigments or carbon black in polyolefin pipes, fittings and compounds", and Compared with GB/T 18251-2000, the main technical changes are as follows. --- Modify "Microscope. Minimum Magnification × 70" to "with appropriate magnification" (see 3.1.1); --- Increased the dispersion size rating using a 100x microscope (see 4.2.1); --- Increased the dispersion of apparent grades using a microscope with a magnification of at least 70 × (see 4.2.2); --- Modified the sample quality requirements (see 4.1.1.1); --- Increased considerations for the test preparation of tableting methods (see 4.1.1.1); --- Modified the sample width requirement (see 4.1.1.1); --- Modified sample thickness requirements (see 4.1.1.2 and 4.1.2); --- Deleted the microscope model, magnification, increased the thickness of the sample, the average grade of each set of samples and the grade of each sample, each The most representative apparent grade in the set of samples and the apparent grade of each sample, any deviation from the test method details, and Any factor that can affect the outcome, such as bubbles, impurities, etc. produced in the sample (see Chapter 6); --- Revised Table A.1 of Appendix A and added for explanation (see Appendix A). This standard uses the redrafting method to modify the use of ISO 18553.2002 "polyolefin pipes, pipes and blends of pigments or carbon black dispersion Determination of degree. The main technical differences between this standard and ISO 18553.2002 and their reasons are as follows. --- Removed 4.1 "This standard specifies two methods for preparation of samples. tableting method and sectioning method."; --- Refined the description of the apparent grade determination of the sample (see 5.2), added the reference to the informative Appendix D, which is convenient for the standard. use; --- For the details of any deviation from the test method in the test report, and any factors that may affect the results, an example is given (see Chapter 6). This standard also made the following editorial changes. --- Incorporate the amendments to ISO 18553.2002/Amd1.2007 (see 4.2.1), reducing the workload of pellet counting; --- Appendix A Table A.1 added "Note 4. particle size is taken as an integer, the first non-zero digit carry after the decimal point". Please note that some of the contents of this document may involve patents. The issuing organization of this document is not responsible for identifying these patents. This standard was proposed by the China Light Industry Association. This standard is under the jurisdiction of the National Plastics Standardization Technical Committee (SAC/TC48). This standard was drafted. PetroChina Research Institute of China National Petroleum Corporation, Shandong Shengbang Plastic Co., Ltd., Asia Group company, Beijing Beihua High-tech New Technology Co., Ltd., Beijing Building Materials Inspection and Research Institute Co., Ltd. Volume Supervision and Inspection Center), Beijing Yanshan Petrochemical High-tech Co., Ltd., Shanghai Baidie Pipe Technology Co., Ltd., Beijing Industry and Commerce University (Light Industry Plastics Processing Application Research Institute). The main drafters of this standard. Lu Xiaoying, Jing Fazhen, Li Yu, Wang Ning, Li Yizhu, Li Jun, Du Bin, Tang Hui, Xu Haiyun. The previous versions of the standards replaced by this standard are. ---GB/T 18251-2000. Polyolefin pipes, fittings and compounds Determination of the dispersion of pigments or carbon black1 ScopeThis standard specifies the method for determining the size and dispersion of pigments or carbon black particles and granules in polyolefin pipes, fittings and compounds. This standard applies to polyolefin pipes, pipe fittings and compounding. When determining carbon black, this standard is applicable to the aggregation of carbon black mass fraction less than 3%. Olefin pipes, fittings and compounds.2 PrincipleTake a small amount of sample from the tube, tube or pellets and compress it to prepare the sample between the microscope slides. You can also use a slicer to cut the sample. Tablets were prepared for the samples. The sample was observed under a microscope, and the size of the particles and the pellets was measured, and the grade was determined in comparison with the sample classification table (see Appendix A, Table A.1). The dispersion size rating of the particles or pellets is determined by the average of the six sample grades. If a dispersive apparent grade is required, it is determined by comparison with a photomicrograph (see Figure B.1 of Appendix B).3 test equipment3.1 General 3.1.1 Microscope. with appropriate magnification (see 4.2), with a calibrated orthogonal moving scale, capable of measuring the size of particles and granules Inch, its illumination should avoid optical effects. 3.1.2 Slide. thickness is about 1mm. 3.2 Tablet device or instrument 3.2.1 Oven or heating plate or other heating equipment. The temperature is controlled between 150 °C and 210 °C. 3.2.2 Scalpel or other suitable tool. used to cut the specimen. 3.2.3 Pressing, heavy objects or spring clips. to maintain pressure. 3.3 Slicing device or instrument Slicer. A sheet of the specified thickness can be cut (see 4.1.2).4 test process4.1 Sample preparation 4.1.1 Tableting method 4.1.1.1 Cut six specimens along different parts of the product with a scalpel. When measuring pigment dispersion, the mass of each sample is (0.6 ± 0.2) mg. When the carbon black dispersion was measured, the mass of each sample was (0.2 ± 0.10) mg. Place six specimens on one or several clean microscope slides Top, each sample is discharged approximately equidistantly from the edge of its adjacent specimen or slide, and covered with another (or several) clean slides. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 18251-2019 be delivered?Answer: The full copy PDF of English version of GB/T 18251-2019 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 18251-2019_English with my colleagues?Answer: Yes. 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