This standard specifies the type, requirements, test methods, inspection rules and marking, packaging, transportation and storage of mica sheets for electrical insulation. This standard applies to hard mica insulation materials made of flaked mica as the base material and suitable adhesive paint as the adhesive, which are pasted, baked and pressed. JB/T 900-1999 Paint-lined mica sheet JB/T900-1999 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 900-1999
Painted Mica Sheet
Published on August 6, 1999
State Bureau of Machinery Industry
Implementation on January 1, 2000
JB/T900-1999
This standard is a revision of B900-74 "Painted Mica Sheet". Compared with JB900-74, this standard has the following main differences in addition to the modification of the writing format of the standard: 1 It is arranged according to the provisions of GB/1.1-1993 on the arrangement of product standard elements, and the elements such as "scope, "reference standards", "classification and naming", "requirements", "test methods", "inspection rules" and "marking, packaging, transportation, storage" are supplemented and revised. 2 In the "length and width" item, the allowable deviation is supplemented to ±5%. 3 "Test methods", "inspection rules" and "marking, packaging, transportation, storage" are respectively in accordance with GB/T5019-1985 "Electrical Insulation Mica System" This standard shall replace JB900-74 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Insulating Materials. The drafting units of this standard are Guilin Electric Science Research Institute and Shanghai Electric (Group) Co., Ltd. Mica Insulating Materials Factory. The drafter of this standard is Li Yuanzhang.
This standard was first issued in 1966: the first revision was in 1974, and the second revision was in 1999. This standard is entrusted to the National Technical Committee for Standardization of Insulating Materials for interpretation. 1
Mechanical Industry Standard of the People's Republic of China
Mica Board
JB/T900 -1999
Replaces JB900-74
This standard specifies the model, requirements, test methods, inspection rules and marking, packaging, transportation and storage of mica sheets for electrical insulation.
This standard applies to hard mica insulation materials made of flaked mica as the base material and suitable adhesive varnish as the adhesive, which are pasted, baked and pressed.
Cited standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard, the versions shown are valid. All Standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB/T5019-1985 Test methods for electrical insulating mica products (negIEC60371-2: 1973) GB/T5020-1985 Definition and general requirements for electrical insulating mica products (neqIEC60371-1: 1973) JB/T2197-1996 Classification, naming and model compilation methods for electrical insulating materials Classification and naming
According to the provisions of JB/T2197, this standard is based on the mica used in the product Different types of base materials and adhesives are divided into product models. Product models are shown in Table 1.
5755—2
5760—2
Mica base material
Flake muscovite
Real muscovite
Flake muscovite
Flake phlogopite
Remaining phlogopite
Adhesive
Alkyd adhesive paint
Shellac adhesive paint
Organic silicone adhesive paint
Organic silicone adhesive paint
Ammonium phosphate adhesive paint
Application range Applicable for insulation of motors and electrical appliances, such as washers, gaskets, etc. The gasket mica board should have neat edges, evenly distributed adhesive paint, and no pinholes, surface bubbles, foreign matter, or corner delamination. 4.2 Size 4.2.1 Thickness and allowable deviation Approved by the State Machinery Industry Bureau on August 6, 1999, and implemented on January 1, 2000 JB/T900-1999 The nominal thickness and allowable deviation of the gasket mica board are shown in Table 2. Table 2 Nominal thickness 5760-2 Allowable deviation of median value and nominal thickness Note: Non-standard specifications can be agreed upon by both the supplier and the buyer. Length, width and allowable deviation
Allowable deviation of individual values ​​from nominal thickness
The recommended length and width are 600mm×400mm (the length and width of 57602 ammonium phosphate commutator phlogopite mica board are 550mm×250mm). The deviation of length and width of mica board trimmed according to nominal size is ±5%. The length and width not less than 300mm×200mm are allowed to account for less than 5% of the total weight. 4.3
Physical, chemical and dielectric properties
The performance requirements of gasket mica board shall comply with the provisions of Table 3. Test method
5.1 Appearance
Evaluate by visual observation.
Length and width
Measure at least three places with a ruler with a graduation value of 1mm and report the average value. 5.3The remaining tests shall be carried out in accordance with the provisions of GB/T5019. No.
Mica content
Adhesive content
Volatile content
Electrical strength
At 23±2℃
Volume resistivity
At 23±2℃
After being exposed to moisture for 48h
Delamination rate
Specimen size
20 mm×40 mm
40mmx40mm
JB/T900-1999
1×10l
≥1× 1ola
Nominal thickness
≥5×10to
≥5×10s
5760-2
≥5×1010
≥5×108
The individual value of electrical strength shall not be less than 75% of the standard value; for nominal thickness above 1mm, the breakdown voltage shall not be less than 15*V. 2For nominal thickness above 1mm, the delamination rate is not specified. 2
Inspection rules
The same raw materials and processes, continuous production, and the quantity not exceeding 500kg are a batch of liner mica boards, and each batch must be inspected before delivery. The factory inspection items are 4.1, 4.2 and 4.3 Table 3, item 2. 6.2 Samples of not less than 5% of the total weight of each batch shall be inspected according to 4.1 and 4.2. Samples of the same board shall be taken for other inspections. 6.3 Others shall be in accordance with the provisions of Chapter 2 of GB/T5020-1985. 7 Marking, packaging, transportation, storage
The storage of padding mica boards is six months from the date of leaving the factory. 7.1
Others shall be in accordance with the provisions of Chapter 3 of GB/T5020-1985. 7.2
Chinese People's
Mechanical Industry Standard
JB/T900-1999
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Format 880×1230wwW.bzxz.Net
Edition X in xX month, 19XX
Printing 1-XXX
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Print Sheet X/X
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Printing X in XX month, 19XX
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