This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of unsaturated polyester glass fiber reinforced sheet molding compound and unsaturated polyester glass fiber reinforced bulk molding compound series products. This standard is applicable to sheet and bulk molding compounds made of unsaturated polyester resin as binder and glass fiber as reinforcing material. JB/T 7770-1995 Unsaturated polyester glass fiber reinforced molding compound JB/T7770-1995 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Unsaturated polyester glass fiber reinforced molding compound 1 Subject content and scope of application
JB/T7770—1995
This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of unsaturated polyester glass fiber reinforced sheet molding compound and unsaturated polyester glass fiber reinforced lumpy model material series products. This standard is applicable to sheet and lumpy model materials made of unsaturated polyester resin as binder and glass fiber as reinforcing material. 2 Reference standards
GB1033—86
GB1043-79
GB1408—89
GB140989
GB1411—78
GB4207—84
GB10064-88
GB 11020--89
GB11026.1—89
JB3961—85
ZBK08002—90
3Product Classification
Test method for density and relative density of plastics
Test method for impact of simply supported beam of plastics
Test method for electrical strength of solid insulating materialsTest method for relative dielectric constant and dielectric loss factor of solid insulating materials at room temperature, sound pressure and high pressure (including wavelength)
Test method for high voltage and low current intermittent withstand test of solid electrical insulating materialsMethod for determination of comparative hysteresis tracking index and resistive tracking index of solid insulating materials under humid conditions Test method for insulation resistance of solid insulating materials Test method for determining the burning properties of solid electrical insulating materials after exposure to an ignition source Guide for determining the potential resistance of electrical insulating materials General procedure for establishing ageing test methods and evaluation of test results Test method for heat-resistant moulding compounds for electrical insulation General rules for inspection, marking, packaging, transportation and storage of glass fiber reinforced plastics for electrical insulation The types and characteristics of unsaturated polyester glass fiber reinforced sheet moulding compounds are shown in Table 1. 3.1
The types and characteristics of unsaturated polyester glass fiber reinforced bulk moulding compounds are shown in Table 2. Table 1
4341(SMC-1)
4343(SMC-2)
4331(SMC- 3) The glass fiber length is 25~50mm, suitable for molding large-scale, high-functional strength structural parts. Approved by the Ministry of Machinery Industry in 1995--10-09. High mechanical strength, excellent electrical properties, low shrinkage, flame retardant, attached charge, high resistance to leakage tracking, heat resistance, products can be used for a long time at 155°C. Excellent mechanical and electrical properties, low shrinkage, flame retardant, double resistance to electricity, high resistance to leakage tracking, heat resistance: the products can be used for a long time at 155C. Good mechanical and electrical properties, high resistance to hysteresis. | Thin, the product can be used for a long time at 130 ℃
Main purpose
Used for insulating structural parts of electrical products such as electrical appliances and motors with high mechanical and electrical strength, and structural parts in the fields of automobiles, ships, and buildings
Used for insulating structural parts of electrical appliances, motors and other electrical products with high mechanical and electrical performance requirements
Used for general structural parts with mechanical and electrical strength requirements
1996-01-01 implementation
4542(DMC-1)
JB/I 7770—1995
Machinery and health are excellent
Receiving period household certificate rental account, kitchen appliance
sweet and smooth electric tracking, heat resistant, the product can be used for a long time at 1550
The fiber length is 3~13mm, suitable for
4344(DMC—3" molding transfer complex belt parts 4332:DMC—3
4 Technical requirements
4.1 Appearance
Excellent mechanical and electrical properties, low maintenance cost, plastic flame retardant, electrical resistance, high short-circuit electric
short tracking, heat resistant, the product can be used for a long time at 155
Mechanical and electrical Good performance, mainly used in electrical appliances, motors and other electrical products with high requirements on performance and electrical strength. Used in electrical appliances, motors and other electrical products with high requirements on performance and electrical performance. Maintaining structure 5. Used in electrical appliances, motors and other electrical products with general requirements on performance and electrical skin. High leakage tracking resistance, can be used for long-term sale at 130℃. No foreign impurities shall be mixed in the glass fiber reinforced molding compound and polyacetal. After molding, the surface of the product should be neat and smooth, without bubbles and blotches.
4.2 Performance indicators
The performance indicators of unsaturated glass fiber reinforced molding plastics after molding shall be determined according to Table 3. Table 3
Green Name
Water Absorption
Mold Shrinkage
Heat Deformation Degree (A)
Impact Strength (Simply Supported Beam, No Notch)
Flexural Strength
Insulation Electrical
After Water Intensification for 24h
Electrical Strength (90℃ Transformer)
Xinbo Niu
Dielectric Loss Factor 1M
Relative Dielectric Constant (1M)
Time Leakage Current Index PT
Absorbency
Long-term Thermal Stability Index
SMC-1SMC-
31.0×10\
SMC--3
|DMC—iDMC--2bZxz.net
1. 75~1.95
>1. 0×10t
EMC—3
1. 0×10*
5Test method
5.1 Selection
According to 3B3961, Section/
JB/T 77701995
5.2 Sample preparation/
Prepare according to the relevant provisions of JB3961, Part 2→ Sample pressing and packaging
Molding temperature
150~160
5.3 Sample handling and test environment
According to the relevant provisions of Chapter 3 of JB3961. 5.4 External specifications
Visual evaluation.
s.5 Density
Determined according to GB1033·Medium Energy A Method
5.6 Water absorption||t t||Molding method
Material is not allowed to be preheated
Measured according to method 1 in Chapter 8 of JB3961, and the test is expressed in grams. 3.7 Molded box thickness
Measured according to Chapter 10 of JB3961
5.8 Heat deformation temperature
Measured according to Chapter 18 of JB3961, using method A. 5.9 Bending strength:
Measured according to Chapter 17 of JB3961
5.10 Impact strength of simply supported beam (completed) measured according to GB1043, test consumption 5.11 Insulation electrical testing: According to GB10064, using can pin electrodes, sample thickness 0.0 ± 0.25mm, 3 samples per group, test voltage 5℃ 0~1000V, 5.1? Electric strength: According to GB140g. After the sample is preheated in 90°C air compressor oil for 30min, a rapid pressure test is used. The sample is a bacterial sheet with a diameter of 100±1mm and a thickness of 3.00.25mm. The number of samples per group is 5, 5.1 3 Dielectric loss factor and relative dielectric constant are measured according to CB1409, using a loop spectrum source, test diameter 50±0.5mm, 2~4mm film, 3 pieces per group, high frequency: two-electrode system, plate diameter 50mm. 5.14 Electrical resistance
Measured according to C1411:
5.15 Tracking index (PT
Measured according to GB4207:
5.16 Flame retardancy
Measured according to the fire sink straight specimen FV method in GB1102V). 5.17 Long-term heat resistance
Measured by the method specified in GB11026.1. The end point judgment standard is a 50% decrease in the initial value of bending strength and electrical strength. 6 Inspection rules
JB/T7770—1995
Perform according to the relevant provisions of Chapter 2 of ZBK08002. The factory inspection items are 5, 6, 7 (only normal insulation resistance), 8, and 11 in Table 3 of Chapter 4. 6.1
6.2 Type inspection items are 1 to 13 items in Table 3 of Chapter 4. 6.3 Long-term heat resistance is not included in the factory inspection and type inspection items, but is only used as product identification content. 6.4 Every 5t is a batch of products.
7 Marking, packaging, transportation and purchase and storage
Marking and packaging
shall be carried out in accordance with the relevant provisions of Chapter 3 of ZBK08002, 7.2 Transportation
shall be carried out in accordance with the relevant provisions of Chapter 3 of ZBK08002. It shall not be close to heat sources. 7.3 Storage
shall be carried out in accordance with the relevant provisions of Chapter 3 of ZBK08002, and the product should be stored in a dry and ventilated warehouse below 30℃. From the date of leaving the factory, the storage period is three months. After the storage period, it can still be used after passing the inspection according to Article 6.2. Additional remarks:
This standard is proposed and managed by the National Technical Committee for Standardization of Insulating Materials. This standard was drafted by Guilin Electrical Science Research Institute of the Ministry of Machinery Industry. This standard was drafted by Dongfang Insulation Material Factory, Harbin Insulation Material Factory, Wuxi County Micro Motor Factory, and Hangzhou Hongshen Electrical Industry Company. The main drafters of this standard are Tang Peihan, Zhang Rong, Lang Yongfu, Wang Jingwu, and Gao Jinhuan.
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