GB/T 5022-1998 Mica sheets for electric heating equipment

This standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation and storage of mica sheets for electric heating equipment. This standard applies to hard mica sheets made of mica paper as the base material and bonded with a suitable adhesive. The adhesive may escape completely during the application process and become a material that requires support; it may also be retained in whole or in part and become a self-supporting material. In this case, the adhesive must be able to withstand the operating temperature. GB/T 5022-1998 Mica Sheets for Electric Heating Equipment GB/T5022-1998 Standard download decompression password: www.bzxz.net

GB/T5022—1998
This standard is equivalent to IEC publication 371-3-3 (1983 Edition 1) Specification for mica insulating materials Part 3: Specification for individual materials Part 3: Specification for hard mica materials for heating equipment, and is a revision of GB/T5022—1985 Mica sheets for electric heating equipment. In IEC371-3-3, 1983, the products are divided into six types according to the different types of mica substrates and adhesives used in the products. In view of the actual situation that there are only two types of domestic products at present, namely, mica sheets for electric heating equipment manufactured with muscovite paper and silicone resin adhesive paint, and mica sheets for electric heating equipment manufactured with phlogopite paper and silicone resin adhesive paint, two types of products corresponding to the HP5 type products in the EC371-3-3, 1983 standard are listed in the revision of this standard. The product models are compiled in accordance with the classification, naming and model compilation method of JH/T2197-1996 electrical insulating material products. HP5 (5660-1) is manufactured with muscovite paper as the base material and silicone resin adhesive paint. HP5 (5660-3) is manufactured with phlogopite paper as the base material and silicone resin adhesive paint. In addition, according to the actual level of domestic products, the density index value is adjusted from (1.6~2.1) g/cm2 specified in the IEC 371-3-3, 1983 standard to (1.6~2.45)/cm2. The index values ​​of other index items are consistent with the provisions of IEC371-3-3:1983.
According to the principle of "adopting certain provisions of international standards and foreign advanced standards in the text of machinery industry standards", this revision of the standard strives to correspond to and coordinate with international standards, and cancels the four index items of "delamination rate", "volume resistivity", "high temperature insulation resistance" and "heating loss" in the original GB/T 5022-1985 standard. This standard was first issued in March 1985 and revised for the first time in December 1998. This standard will be implemented from October 1, 1999. From the date of entry into force, this standard will replace GB/T5022-1985. This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Insulation Materials. The responsible drafting unit of this standard is: Mica Insulation Material Factory of Shanghai Electric Group Co., Ltd. The participating units of this standard are: Muxing Insulation Material Factory and Hengyang Insulation Material General Factory. The main drafter of this standard is Li Yuanzhang.
This standard is entrusted to the National Technical Committee for Standardization of Insulating Materials for interpretation. GB/T5022—1998
IEC Foreword
1] IEC formal resolutions or agreements on technical issues are formulated by technical committees composed of representatives of national committees that are particularly concerned with these technical issues, and express international consensus on the issues studied as much as possible. 2) These resolutions or agreements are recommended for international use and are accepted by national committees in this sense. 3) In order to promote international unification, IEC hopes that national committees should adopt the text of IEC recommended standards as their national standards within the scope of their national conditions. Any differences between IEC recommended standards and corresponding national standards should be clearly pointed out in the corresponding national standards as much as possible.
4) IEC has never established any marking procedures to indicate its approval, nor is it responsible for any claim that a certain equipment is in accordance with IEC recommended standards.
This standard was prepared by IEC Technical Committee 15\Insulating Materials\, Subcommittee 15C "Specifications". The initial draft of this standard was discussed at the Madrid Conference in 1980. Based on the results of the discussion at this conference, the document No. 15C (Central Office) 135 was submitted to the National Committees for approval in May 1981 according to the June Rule. The National Committees of the following countries explicitly voted in favor of publication: Argentina
Austria
Belgium
Canada
Czechoslovakia
Democratic Germany
Federal Germany
Ireland
Israel
Romania
Yugoslavia
Other IEC publications cited in this standard: IEC Publication 371-2 & Specification for Mica Insulating Materials Part 2! Test method%
1 Scope
National Standard of the People's Republic of China
Mica board for electric heating equipment
Specification for rigid mica materials for heating equipmentGB/T 5022—1998
qq1EC371-3-3:1983
Replaces GB/T 5022—1985
This standard specifies the requirements, test methods, inspection rules and marking, packaging, transportation and storage of mica boards for electric heating equipment. This standard applies to rigid mica boards made of mica paper as the base material and bonded with suitable adhesives. The adhesive may escape completely during the application process and become a material that requires support; it may also be retained in whole or in part and become a self-supporting material. In this case, the adhesive must be able to withstand the operating temperature. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T5019-1985 Test methods for electrical insulating mica products (neq1EC371-2: 1973) GB/T5020—1985 Definitions and general requirements for electrical insulating mica products (neqIEC371-1: 1980) 3 Product classification
This standard divides product models according to the different types of mica substrates used in the products. Product models are shown in Table 1. Table 1
Product model
HP5(5660-1)
HP5(5660-3)
4 Requirements
4.1 Appearance
Mica substrate
Muscovite mica paper
Phlogopite mica paper
Adhesive
Silicone resin adhesive paint
Mica boards for electric heating equipment should have neat edges and evenly distributed adhesives. Foreign impurities and delamination are not allowed. 4.2 Dimensions
4.2. 1 Thickness
See Table 2 for nominal thickness and allowable deviation.
Nominal thickness
Deviation between median value and nominal thickness
Approved by the State Administration of Quality and Technical Supervision on December 21, 1998 ±0. 04
Difference between individual value and nominal thickness
Implemented on October 1, 1999
Nominal thickness
Above 1.00
GB/T 5022-1998
Table 2 (Complete)
Difference between median value and nominal thickness
Difference between individual value and nominal thickness
Note: If the nominal thickness is between the two adjacent nominal thicknesses listed above, its deviation shall be the deviation of the adjacent larger nominal thickness. 4.2.2 Length and width
The recommended length is 1000 mm and the width is (500~1000) mm. It can also be supplied according to the size agreed upon by the supply and demand parties. The allowable deviation of length and width is ±5%.
4.3 Performance requirements
Performance indicators are shown in Table 3.
5 Test methods
5.1 Appearance
Indicator name
Adhesive content
Density!
Electrical strength
Bending strength
Defects and conductive particles
Evaluate by visual observation.
5.2 Thickness
According to the provisions of Chapter 1 of GB/T 5019--1985. 5.3 Length and width
Use a ruler with a graduation value of 1 mm to measure at least three places and report the average value. 5.4 Adhesive contentbzxz.net
According to the provisions of 3.3.5 in GB/T5019--1985. 5.5 Density
According to the provisions of Chapter 2 of GB/T5019-1985. 5.6 Electric strength
According to the provisions of Chapter 16 of GB/T 5019-1985. 5.7 Bending strength
Bending strength test method is under consideration.
5.8 Detection of defects and conductive particles
1. 6 ~ 2. 45
Under consideration
Indicator value
Acceptable defect form and number are subject to the agreement between the supply and demand parties. The detection method of defects and conductive particles is to be determined. Before the method of detecting defects and conductive particles is determined,Acceptable defect forms and days shall be subject to the agreement between the supplier and the buyer.
Instructions for use:
11 1EC: 371-3-3 HP5 type treatment index value is (1. 6~~2. 1) g/cnr. 6 Inspection rules
GB/T5022-1998
6.1 Mica boards for electric heating equipment that are continuously produced with the same raw materials and processes and whose quantity does not exceed 500kg are considered a batch. Each batch shall be subject to factory inspection, and the factory inspection items are 4.1, 4.2 and 4.3, Table 3, Item 3. 6.2 Samples of each batch shall not be less than 5% of the total weight, and shall be inspected according to 4-1 and 4.2. Other inspections shall be sampled on the same board. 6.3 Others shall be in accordance with the provisions of Chapter 2 of GB/T5020-1985. 7 Marking, packaging, transportation, storage
7.1 The storage period of mica sheets for electric heating equipment is six months from the date of leaving the factory. 7.2 Other requirements shall comply with the provisions of Section 3 of GB/T50201985.
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