Some standard content:
National Standard of the People's Republic of China
Silicone resin glass lamiated sheets
Silicone resin glass lamiated sheetsUDC
678.84.072
419.004.1
GB4206-84
This standard applies to silicone laminated glass cloth SIGC1 type silicone laminated glass cloth sheets which are made of silicone resin as binder and alkaline glass cloth as substrate by heating and pressing. The dielectric properties of SIGC1 type silicone laminated glass cloth sheets are excellent in the dry state and the performance is still good in the wet state. They are suitable for the electronic industry and other electrical circuits.
SIGC2 type silicone laminated glass cloth sheets have excellent heat resistance and are suitable for mechanical and electrical purposes at high temperatures. This standard is equivalent to the technical requirements of SIGCi type and SIGC2 type laminated sheets formulated by the International Organization for Standardization 1S01642-1979 (E) "Specification for Heat-resistant Resin Industrial Laminated Sheets". Technical requirements
1.1 AppearancewwW.bzxz.Net
The edges of the laminate should be cut neatly, and there should be no delamination or cracks on the end faces. The surface of the laminate is not allowed to have bubbles, wrinkles and eyes, but slight scratches, pits and color differences are allowed, and a small amount of color spots are allowed. 1.2 Size and deviation
1.2.1 Width and length:
The range of the width and length of the laminate and the deviation of the corresponding size shall comply with the provisions of Table 1. Table 1
Width and length
(nominal size)
4501000
1000～2000
Note: If it is different from the specified nominal size, it can be produced after the agreement between the supply and demand parties. 2.2 Thickness
The nominal thickness of the laminate and its deviation are as specified in Table 2. The measuring device has an accuracy of .11mm, a measuring head diameter of 6-8mm, and the pressure acting on the sample should be 0.1-0.2kgf/cm. Table 2
Nominal thickness
Single point deviation
±0,24
Standard thickness
Single point deviation
±0,60
Nominal thickness
Note: Non-nominal thickness can be manufactured by negotiation between the two parties, and the deviation is adopted as follows. The deviation value of the larger nominal thickness: National Standard Kitchen 1484-03-18 Issued
Academic Points Edited
1984-12-01 Implementation
GB 4206--84
1.3 Warpage
Laminated board with a nominal thickness of 3mm or more, with the concave surface facing upwards, is placed freely on a horizontal surface. The distance from a light ruler placed on the board in any direction to any point on the upper surface of the board should not exceed the corresponding value listed in Table 3. Table 3 Maximum allowable distance from the ruler to the board surface
1.4 Machinability
Ruler length
Laminated boards should not have cracks or slag after sawing, drilling, turning, milling, planing and other mechanical processing.
1.5 The physical, mechanical and electrical properties of laminated boards should comply with the provisions of Table 4. Table 4
Test method
Flexural strength of perpendicular slab
(minimum value)
Impact strength (notched specimen, parallel slab test) Simply supported (minimum value)
Beam (Charpy) method
Electrical strength in the vertical direction, at 90 ± 2 ℃: Imin in transformer oil
(minimum value)
Directional insulation resistance after immersion in water
(minimum value)
1MHz dielectric loss factor after immersion in water
(maximum value)
1MHz relative dielectric constant after immersion in water
(maximum value)
Water absorption coefficient
(maximum)
Legal terms
kgf/cm2
kgf.cm/cm2
(KJ/m\)
Maximum value of the tested plate||t t||Maximum or minimum standard
Nominal thickness m
Minimum 1.5
Minimum 5
Minimum 3
Maximum 3
SIgCi:SIGC2
1×102
1×10°
Brother table
*For SIGC2 type, at 180+5 overheated cylinder oil is treated with 1cm scale, and the strength of the flange measured at 180+5 is not less than 40% of the value specified in the table, **Nominal thickness is less than or equal to 3 For plates with a nominal thickness of mm, the two parties shall negotiate separately. **For plates with a nominal thickness of less than 3mm, the supply and demand parties shall negotiate separately. Plate thickness mm
GB4206—84
Indicator mE
Maximum water absorption
Plate thickness mm
[Single-sided processing*)
Indicator mg
Note: If the measured average value of the sample thickness is between the two thickness values listed in Table 5, its water absorption index value shall be obtained by the internal extension method; if the measured average value of the sample thickness is less than 0.4mm, the water absorption index value equivalent to the minimum thickness shall be used. If the nominal thickness is 25mm and the half-average measured thickness exceeds 25mm, the index value of 25mm shall be used.
2 Test method
2.1 Sampling method| |tt||Take the sample in the direction specified in the product standard at a distance of not less than 50m2 from the edge. The rear end of the sample should be half-smooth, without delamination and cracks, and the surface should be free of damage and burnt. 2.2 Appearance
Evaluate by visual observation.
2.3 Machining
Conducted by negotiation between the supply and demand parties.
2.4 Determination of bending strength of vertical board layer
The bending strength of vertical board layer shall be tested according to the bending strength test method of GB1304-77 "General Test Method for Electrical Insulating Thermosetting Laminated Products".
The sample should be cut from the tested board, and 5 samples should be taken in the longitudinal and transverse directions. When the thickness of the tested board is 10mm, the sample should be processed from the - side of the board to 10±0.5mm. The size of the sample is: length: L = 20hmm* (h accurate to 0.02mm) width: 6 = 1.5 ± 0.5mm
Adjust the support span (L,) so that L, = 16hmm and measure the span accurately to within 0.5%. The sample is placed at 23 ± 2℃ and relative humidity 45% ~ 55% for at least 24h, and the test is started within 3min after taking ll from the environment. Apply the load perpendicular to the board layer. Calculate the average value between the vertical and horizontal squares respectively, and take the lower one as the test result. 2.5 Determination of impact strength (Cnarpy)
The impact strength is tested according to the impact strength test method in GB1304--77, but a notched sample should be used. The sample should be pierced from the tested board, and 5 samples are taken longitudinally and transversely. The bottom of the notch is perpendicular to the board layer, and the arc radius of the bottom edge should be less than 0.2mm. When cutting the specimen from a plate with a thickness of 5 to 10 mm, its thickness is the same as the plate thickness. When cutting specimens from a plate with a thickness of more than 10 mm, cut the specimen evenly from both sides to 10 ± 0.5 mm. The size of the notched specimen is shown in the figure. When the specimen thickness is less than 10 mm, a steel gasket should be placed behind the impact test support to make the thickness of the specimen heating plate 10 ± 0.5 mm. * The material with a nominal thickness greater than 25 mm should be cut into a relatively smooth surface to 22.5 mm. ** When the plate thickness hc5 mm, 1L=16h+20 mm, GB4206-84
The span of the support is 70 mm. The angle of the hammer of the testing machine is 30°, and the radius of the tip corner is 2+0.5 mm. The sample is placed at 23±2℃ and relative humidity of 45%～55% for 24h. The test is started within 3min after it is taken out of the environment. The average values of the longitudinal and transverse directions of the impact direction should be calculated for each layer. The lower average value is taken as the test result. The impact strength is calculated according to the following formula: A
aa=-bhx
I: a-impact strength, kgf·cm/cm, A-impact energy consumed by breaking the sample, kgf·cmb-width of the notch part of the test grid, cm, h-thickness of the middle part of the notch of the sample, cn. 1*=10+.3
Laminate plate standard for measuring impact strength Notch sample 2.6 Determination of withstand voltage in parallel to the layers
The withstand voltage test in parallel to the layers is carried out according to 31408-78 "Test methods for power frequency breakdown voltage, puncture strength and withstand voltage of solid electrical insulation materials".
. The sample length is 100mm and the width is 25±0.2mm, thickness is the original thickness of the tested sheet. Take three samples, and cut the two long sides of the samples into two parallel planes perpendicular to the surface of the material. The sample is placed between two parallel metal plate electrodes, and the voltage is applied to the 25mm wide sample between the two electrodes. For thin materials, two samples can be placed appropriately (that is, their long sides form a suitable angle) to support the electrodes. The electrode should be large enough so that the electrode covers the sample by at least 15mm on each side of the sample. The sample should be treated at 50±2℃ and relative humidity less than 20% for 24h, cooled to 90±2℃ in the room, and kept in transformer oil for 0.5~1h, and then immediately carried out a 1min withstand voltage test in the oil. The test results are qualified if the three samples are not broken down, and are expressed in kV. 2.7 Determination of insulation resistance in parallel layers after flooding The insulation resistance after immersion in water is tested in accordance with GB1410-78 "Test method for insulation resistance, volume resistance and surface resistivity of solid electrical insulating materials".
The length of the sample is 76+mm, the width is 50+mm, and the thickness is the same as the tested board. Four samples are used, 2 longitudinal and 2 transverse. The sample should be buried for 24 hours at 50±2℃, the temperature is less than 20%, cooled to room temperature, and immersed in 23±2 distilled water for 24±1h. Take the sample out of the water, wipe it with a clean cloth or filter paper, insert the electrodes, the distance between the electrodes is 25±1mm, and measure the insulation resistance at 15~35℃ in an environment with a relative humidity of no more than 75%. The external voltage is 500±12V. The measurement should be completed within 1.5~2min after the sample is taken out of the water. Calculate the average value of the longitudinal and transverse directions respectively, and take the lower average value as the test result. 2.8 Determination of dielectric loss tangent and relative dielectric constant at 1MHz after immersion in water GB 4206-84
Dielectric loss tangent at 1MHz after immersion in water, relative dielectric constant shall be tested according to GB1409-78 "Test method for dielectric constant and dielectric loss tangent of solid medium and high insulation materials at power frequency audio frequency and high frequency". The sample size is 55mm×55mm, and two samples shall be tested. The test uses oil-pasted aluminum foil electrodes, diameter×50±0.1mm. The sample shall be treated at 50=2℃, relative humidity less than 20%, for 24h, cooled to room temperature, immersed in 23±2 distilled water for 24h, then taken out and wiped with clean cloth, blotting paper or filter paper. The electrode is added with the sample after immersion in water, and the reading is tested at 1MH2 frequency within 2umin after taking out. The test environment is temperature 23±2℃, relative humidity 45%～55%. The test results are an average value of the dielectric load and two half-mean values of the relative dielectric coefficient. 2.9 Determination of water absorption
2.9.1 Instrument
Day with a sensitivity not greater than 1mg;
Oven, controllable temperature 50±2℃,
Container with controllable temperature 23±0.5℃;
d. Dryer.
2.9.2 Sample
50±1mm square, take 3 pieces. The thickness of the sample is the thickness of the tested plate. The cut surface is smooth. 2.9.3 Test steps
After the sample is dried in an oven at 50±2℃ for 24±1h, it is cooled in a dryer. Each sample is weighed accurately to 1m, and then the sample is placed in a container filled with distilled water. The water temperature is controlled at 23±0.5℃. After 24±1h, they are taken out of the water and all surface moisture is wiped off with a clean cloth or filter paper. The sample is weighed again within 1min. If necessary, the sample can be weighed in a weighing bottle. 2.9.4 Calculation and expression of results
m=m2-m;
Where: m-
Water absorption of the sample, mg
The weight of the sample before immersion in water, mg
m2—The weight of the sample after immersion in water, mg.
The arithmetic mean of the values obtained from the three samples is taken as the test result. 3 Inspection rules
The acceptance rules shall comply with the relevant provisions of GB1305-77 "General Rules for Acceptance, Packaging, Labeling, Storage and Transportation of Electrical Insulation Thermal Laminated Products". The test is recommended to be carried out as follows: Articles 1.1, 1.2, 1.3 and Item 3 of Table 4 of Article 1.5 of this standard, of which Articles 1.1, 1.2 and 1.3 are for sheet-by-sheet inspection.
Labeling, packaging, transportation and storage shall comply with the provisions of GB1305-77. Additional remarks:
This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard was issued by the Shanghai Insulation Material Factory of the Ministry of Machinery Industry and drafted by the Guangzhou Electric Science Research Institute. The main drafters of this standard are Shan Yongnian, Li Ying and Liu Rihua.
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