This standard specifies the model, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of epoxy glass powder mica tape (hereinafter referred to as powder mica tape) used for vacuum pressure impregnation. This standard is applicable to mica tape with mica paper as the base material, epoxy adhesive paint as the adhesive curing agent, and electrical alkali-free glass cloth as the reinforcing material on one or both sides. It is soft under normal conditions and is cured and formed after being treated with a compatible impregnation resin through a vacuum pressure impregnation insulation process. The final curing performance of the powder mica tape mainly depends on the vacuum pressure impregnation resin used. JB/T 6488.4-1995 Epoxy glass powder mica tape for vacuum pressure impregnation of mica tape JB/T6488.4-1995 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Mica Tape
Epoxy Glass Powder Mica Tape for Vacuum Pressure Impregnation 1 Subject Content and Scope of Application
JB/T6488.4-1995
This standard specifies the model, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of epoxy glass powder mica tape (hereinafter referred to as powder mica tape) for vacuum pressure impregnation. This standard is applicable to powder mica tape with mica paper as the base material, epoxy adhesive paint as the adhesive, and electrical alkali-free glass cloth as the reinforcement material on one or both sides. It is soft under normal conditions and is cured and formed by using a compatible impregnation resin after vacuum pressure impregnation insulation process. The final curing performance of the powder mica tape mainly depends on the vacuum pressure impregnation resin used. 2
Referenced standards
GB5019Test methods for electrical insulating mica productsGB5020
Definition and general requirements for electrical insulating mica productsGB5402
Product classification
Determination of air permeability of paper and paperboardGurley methodThis standard divides the models according to the structure and glue content of the product. The product models are shown in Table 1. Table 1
Product models
5442-1
5443-1
5444-1
5445-1
Reinforcement materials
Single-sided alkali-free glass cloth for electrical use
Double-sided alkali-free glass cloth for electrical use
4 Technical requirements
.4.1 Appearance
Adhesive
Epoxy Resin
Epoxy palmitic anhydride adhesive paint
Epoxy boroamine adhesive paint
Glue content
Application range
Applicable to vacuum pressure impregnation insulation of large and medium-sized high-voltage motors with an operating temperature of 155°C
The adhesive of the powder mica tape is evenly distributed, and no bubbles, pinholes, adhesion, delamination, external impurities, mica paper breakage, glass cloth filaments and tape loosening are allowed.
4.2 Size
4.2.1 Thickness
The nominal thickness and allowable deviation of the powder mica tape are shown in Table 2. 4.2.2 Width
The width of the powder mica tape is: 12mm±1mm, 15mm±1mm, 20mm±1mm, 25mm±1mm, 30mm±1mm35mm±1mm.
Approved by the Ministry of Machinery Industry on November 24, 1995
Implemented on June 1, 1996
Product model
5442-1
5443-1
5444-1
5445-1
Edge curvature
JB/T6488.4-1995
Nominal thickness
Deviation between median value and nominal thickness
The edge curvature of the mica tape shall not exceed 1mm. 4.2.4 Length
Deviation between individual value and nominal thickness
The length of the mica tape shall be expressed by the diameter of its roll or disk. The diameter of the mica tape roll and disk is 95mm±5mm or 115mm±5, with no more than one joint and the shortest length not less than 5m. The mica tape roll or disk with joints shall be marked. mm,
The composition of the mica tape is shown in Table 3.
Nominal thickness
Product model
5442-1
5443-1
5444-1
5445-1
Performance requirements
Mica quantitative
Nominal value
The performance of the mica tape shall comply with the provisions of Table 4. Sequence
Test method
Indicator name
Dielectric strength
Tensile strength
Air permeability
Evaluate by visual observation.
5.2Thickness
N/10mm
s/100ml
According to the provisions of Chapter 1 of GB5019.
Glass cloth quantitative
Nominal valuewww.bzxz.net
5442-1
Adhesive
5443-1
Total mass per unit area of ​​dry material
Nominal value
5444-1
To be agreed upon by both parties
To be agreed upon by both parties
Volatile matter
5445-1
5.3Width
JB/T6488.4-1995
Measure at least three places with a ruler with a scale of 0.5mm and report the average value. 5.4 Edge curvature
According to the provisions of Chapter 13 of GB5019.
5.5 Length
Measure the end diameter of the mica tape roll or disk with a ruler with a scale of 0.5mm. 5.6 Composition
According to the provisions of Chapter 3 of GB5019.
5.7 Dielectric strength
According to the provisions of Chapter 16 of GB5019.
5.8 Tensile strength
According to the provisions of Chapter 5 of GB5019.
5.9 Stiffness
According to the provisions of Chapter 7 of GB5019.
Air permeability
According to the provisions of GB5402.
Inspection rules
6.1 The same raw materials and processes are used to continuously produce mica tapes for no more than 24 hours. Each batch of mica tapes should have the same performance. Each batch of mica tapes must be inspected before delivery. The inspection items are 4.1, 4.2, 4.3 and 4.4 of this standard, Table 4, Items 1 and 2.
6.2 Take samples from no less than 5% of the total number of packaging bamboo shoots (bags) in a batch, and the batch size should not be less than 3 bamboo shoots (bags) per hour. Take one drum from each bamboo shoot and inspect it according to 4.1 and 4.2 of this standard. Take one drum from a batch and inspect it according to 4.3 and 4.4 of this standard. 6.3 Items 3 and 4 in Table 4 of 4.4 of this standard shall be inspected at least once a year. 6.4 Others shall comply with the provisions of Chapter 2 of GB5020. 7
Marking, packaging, transportation, storage
The powder mica tape should be rolled on a tube core with an inner diameter of 40mm±2mm. The wall thickness of the tube core should not exceed 5mm, which can also be agreed upon by the supply and demand parties. For single-sided reinforced powder mica tape, unless otherwise specified in the order contract, the material should be rolled with the mica paper side facing outward. 7.2
The storage period of powder mica tape from the date of leaving the factory is shown in Table 5. Table 5
Product model
Below 5℃
5442-1
5443-1
5444-1
5445-1
7.3Others should comply with the provisions of Chapter 3 of GB5020. Additional notes:
This standard is proposed and managed by the National Technical Committee for Standardization of Insulating Materials. This standard was drafted by Shanghai Mica Insulation Material Factory. Storage period
6~20℃
The main drafters of this standard are Li Yuanzhang, Yang Lihua, Gu Haigen, and Zhu Chaying. 90
21~35c
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