Original standard number GB 7132-86 HG/T 2751-1996 Determination of moisture content of unplasticized cellulose acetate HG/T2751-1996 Standard download decompression password: www.bzxz.net

HG/T2751—1996
This standard is equivalent to the international standard ISO585:1990 "Determination of moisture content of unplasticized cellulose acetate plastics". It is consistent with it in terms of technical content and writing format. This standard is based on GB/T1.1-1993. The previous version of the standard GB7132-86 is revised as an industry standard. The foreword, ISO foreword and precision chapter are added. A small amount of editorial changes are made in the text. This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Plastic Resin Products Branch (SC4) of the National Plastic Standardization Technical Committee. The drafting unit of this standard is Shanghai Synthetic Resin Research Institute. The main drafter of this standard is Shen Shansan.
This standard was first issued in December 1986. This standard replaces GB7132-86 from the date of its entry into force. ISO
The International Organization for Standardization (ISO) is a joint organization of national standard bodies (ISO member bodies) worldwide. The work of formulating international standards is carried out by ISO technical committees. Any member group interested in a project determined by a technical committee has the right to send representatives to participate in the technical committee. Governmental or non-governmental international organizations can also participate in this work by contacting ISO. ISO works closely with the International Electrotechnical Commission (IEC) on all topics of electrotechnical standardization. The draft international standards adopted by the technical committee are distributed to each member group for voting. To be published as an international standard, at least 5% of the member groups must vote in favor to be valid. International standard ISO585 was formulated by ISO/TC61 Plastics Technical Committee. This second edition replaces the first edition (ISO585:1982), which is slightly revised. 2
Chemical Industry Standard of the People's Republic of China
Determination of moisture content of unplasticized cellulose acetate HG/T 2751 1996
idtISO 585:1990
Warning: The use of this standard may involve hazardous materials, operations and equipment. This standard does not mention all safety issues related to its use. It is the responsibility of the user of this standard to establish appropriate safety and health measures and to determine the applicability of routine systems before use. 1 ScopebzxZ.net
This standard specifies the method for the determination of moisture content of unplasticized cellulose acetate. In order to calculate the dry mass of cellulose acetate used in the analytical method, this method may be required. This method is only applicable to cellulose acetate with a moisture content not exceeding 10%. 2 Principle
The sample is dried in an oven at 105°C and then weighed. The water content is calculated from the mass loss of the sample. 3 Apparatus
3.1 Glass weighing bottle, low and wide, with ground glass cover. 3.2 Desiccator, filled with anhydrous calcium fluoride (or silica gel) 33 Oven, maintained at 105±2°C.
3.4 ​​Balance, sensitivity 1mg.
4 Procedure
4.1 Place the weighing bottle and ground glass cover (3.1) in an oven (3.3) at 105±2°C and dry for 0.5h. Cool in the desiccator (3.2) and weigh to the nearest 1mg-
Weigh about 5g of cellulose acetate in the weighing bottle (accurate Put the weighing bottle with the sample in an oven at 105±2℃, open the cover, put the cover next to the bottle, and bake for 3h. Take the weighing bottle out of the oven, cover it with a ground glass cover, put it in a desiccator to cool, and weigh it again to an accuracy of 1mg.
4.2 Perform two measurements. If the difference between the moisture percentages of the two measurements is greater than 0.1, repeat the test. 5 Explanation of the results
The moisture content is calculated as follows, expressed as a mass percentage: m, -m2
Where: m is the mass of the test material before drying, g
- the mass of the test material after drying, 8.
Take the average of the two qualified test values ​​(see 4.2) as the test result. Approved by the Ministry of Chemical Industry of the People's Republic of China on April 15, 1996 and implemented on January 1, 1997
Precision
HG/T2751-1996
Because the data between laboratories are not available, the precision of this test method is unknown. Before these data are obtained, this method is not applicable in the specification and in controversial situations. Test report
The test report should include the following items:
Indicate that it is in accordance with this industry standard;
Fully identify all the details necessary for the hard test product, including physical form: moisture content percentage.
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