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
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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/T6488.4-1995wwW.bzxz.Net 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 value 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 Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.