JB/T 5970-1991 Test methods for pressure-sensitive adhesive tapes for electrical use
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Test Methods for Pressure-Sensitive Adhesive Tapes for Electrical Use
JB/T 397091
This standard is formulated with reference to the International Electrotechnical Commission (IEC) publication 454-2 (first edition, 1974) "Specification for Pressure-Sensitive Adhesive Tapes for Electrical Use Part 2: Test Methods", publication 454-2A (first edition, 1978) "First Supplement to Publication 454-2 (1974), Specification for Pressure-Sensitive Adhesive Tapes for Electrical Use Part 2: Test Methods" and publication 454-3-5 (first edition, 1980) Specification for Pressure-Sensitive Adhesive Tapes for Electrical Use Part V: Requirements for Fiber Paper Coated with Thermosetting Adhesives" Appendix A "Adhesion Delamination during Heat Treatment (Warping Test)". 1 Subject Content and Scope of Application
This standard specifies the test methods for the physical, mechanical and electrical properties of pressure-sensitive adhesive tapes for electrical use (hereinafter referred to as adhesive tapes). This standard is applicable to the determination of various properties of pressure-sensitive adhesive tapes for electrical use. 2 Reference standards
Test method for determination of electrolytic corrosion caused by insulating materials GB10582
GB11026.1 Guidelines for determining heat resistance of electrical insulating materials Part 1: General procedures for establishing aging test methods and evaluating test results
GB3280
GB1408Www.bzxZ.net
Stainless steel cold and hot rolled steel plates
Test method for power frequency electrical strength of solid insulating materials 3 Sampling and test environment conditions
3.1 The samples for each test of adhesive tape shall be taken from any 3 reels. When sampling, the outer three layers of each reel of adhesive tape shall be peeled off. 3.2 Before sampling, the reeled adhesive tape samples must be placed in a standard environment of 23±2℃ and relative humidity of 45% to 55% for at least 24 hours. Unless otherwise specified, all samples shall be treated in this environment for 1 hour and tested under the same standard environment. If the test is not carried out under the standard environment, each test must be started within 3 minutes after being removed from the standard environment. 4 Thickness
4.1 Test apparatus
Deadweight dial micrometer (thickness gauge). The diameter of the upper measuring surface is 6-8 mm, and the diameter of the lower measuring surface should be larger than the diameter of the upper measuring surface. The graduation value of the dial should be 0.002 mm. The pressure applied to the sample should be 100±10 kPa. The accuracy of the micrometer is calibrated with a thickness gauge. The measurement error of the micrometer should not exceed 0.005 mm. 4.2 Samples
Cut one sample from the disk at intervals of not less than 300 mm, and each sample is not less than 75 mm long, for a total of 9 samples. 4.3 Procedure
Place the sample between the micrometer measuring heads, with the adhesive side facing down and tightly fitting the lower measuring surface. Gently lower the upper measuring head to the surface of the sample and read the reading within 2 seconds, accurate to 0.005 mm.
4.4 Results
Take the median of the 9-point measurement as the test result. Record the maximum and minimum values. Expressed in millimeters. Approved by the Ministry of Machinery and Electronics Industry on June 16, 1992, and implemented on December 1992
5 Electrolytic corrosion
The test was carried out in accordance with the provisions of GB10582.
6 High-temperature penetration resistance
6.1 Apparatus
One steel frame
One steel shaft
7——Screws + nuts
JB/T5970——91
Figure 1 Penetration test machine diagram
Steel C-clip
Steel shaft block
8——Electrical contact indicator
10-—Phenolic laminate insulation block
13 ——Adhesive tape test piece
16—Screws for connecting the circuit
Adjustable base weight
Screws for fixing the shaft block
9—Wire outside the furnace
Nuts and magnetic guide rods
12—Stainless steel ball with a diameter of 1.5 mm fixed on the guide rod14—Screws
17—Platinum resistor jack
Stainless steel plate, 100 mm long, 30 mm wide, 3 mm thick. 15—Stainless steel plate
18—10N load
The heating furnace of the penetration test machine has a heating rate of 30 ± 5℃/h. The heating temperature can reach up to 250℃. A steel ball with a diameter of 1.5 mm is installed at the concave end of the magnetic steel rod. The steel rod is installed on the C-shaped clamp, which can rotate freely and has a weight balance weight. When there is no load on the lower foot of the C-shaped clamp, the steel ball should not exert pressure on the steel plate. During the test, the lower leg of the C-shaped clamp is vertically hung with a 10N load applied to a horizontal stainless steel plate.
The instrument is equipped with a device that can indicate the electrical conduction between the steel ball and the steel plate. A 220V power supply is used. The temperature of the steel plate should be measured as close as possible to the point where the pressure is applied. It is recommended to use a platinum resistance to measure the temperature. 6.2 Samples
Take a sample from the plate at intervals of not less than 300mm, each 25mm long, and take a total of 5 samples. 6.3 Procedure
When the steel ball is not loaded, place the sample under the steel ball at room temperature, then gently add a load to the steel ball so that the load applied to the sample is 10N, and then evenly increase the temperature at a rate of 30±5℃/h until the instrument shows that the sample is penetrated. The temperature indicated by the instrument at this time is the penetration temperature of the sample.
6.4 Results
Take the median value of the 5 penetration temperatures as the test result, and record the maximum and minimum values. 14
7 Resistance to flame spread
JB/T5970-91
7.1 Principle
The following tests are conducted on samples of certain size and under certain conditions; a. Time from ignition to self-extinguishing;
b. Burning length of the adhesive tape.
7.2 Loading
a. Protective device: The protective device is a metal box with dimensions of 250mm×250mm×750mm (see Figure 2). The sample is hung on a movable clip, which is located in the center 30mm below the top edge of the protective device. 12mm holes are evenly distributed around the 25mm above the bottom edge of the protective device.
Stopwatch: Accuracy is 0.2s.
Bunsen burner: The inner diameter of the lamp tube is about 4mm. It can produce a blue flame 20~25mm high. c.
d. Ignition material: The ignition material is made of cellulose film or quantitative filter paper in a triangle shape with a base of 25mm and a height of 30mm. The filter paper should be stored in a dryer for more than 24 hours before use. The quantitative weight of the cellulose film is 50-60g/m. And it is a material that has not been treated in any way.
Fuel: liquefied petroleum gas, natural gas or coal gas. 7.3 Sample
The sample is tested within 3 minutes after being taken out of the pan. The sample is pulled out radially from the pan at a speed of about 300mm/s, and one strip is cut every 300mm. Each strip is 300mm long, and a total of 5 samples are taken. 3
Top view
Stereoscopic view
Front view
Figure 2 Protection device diagram
2 Sliding window
A movable
Side view
Opening surface
When the width of the tape is 25 mm or less, the sample is the original tape width. If the width of the tape is greater than 25 mm, a 25 mm width is cut from the middle of the tape as the sample. A sharp knife should be used to cut the sample to avoid cracking at the edge. Use ink or other suitable methods to draw a line perpendicular to the long side at 50 mm from one end of the sample. Note: Samples with a width less than 25 mm will receive different flame resistance grades. 7.4 Procedure
The bottom edge of the ignition material is attached to the adhesive surface of one end of the tape sample, overlapping by a maximum of 5 mm. A 50 mm mark line is made from the overlapping edge of this end. The other end of the sample is clamped with a clip and hung vertically in a metal box. After opening the movable window and igniting the top of the ignition material with a gas flame, immediately remove the Bunsen burner, close the movable window, and start timing. When the flame goes out, stop timing. 7.5 Results
JB/T5970--91
7.5.1 If 4 out of 5 samples do not burn. 7.5.2 If 4 out of 5 samples extinguish themselves before the 50mm mark, they are rated as "self-extinguishing". Record the median, maximum, minimum and maximum burning length (mm) of the burning time (s) of the 5 samples. 7.5.3 If the burning, melting or carbonization of 4 out of 5 samples exceeds the 50mm mark, they are rated as "flammable". Record the median, maximum and minimum burning time (s) of the 5 samples. 7.5.4 If the product cannot be rated as the above three situations, the test results of each sample shall be stated in the test report. 8 Long-term heat resistance
The long-term heat resistance of the adhesive tape is determined by the breakdown voltage method and the mass loss method in accordance with GB11026. The failure standard is shown in the product standards. 8.1 Breakdown voltage method
8.1.1. Sample
The width of the adhesive tape should be 12~25mm (25mm is more suitable). Wrap a layer of adhesive tape on a clean brass rod with a diameter of 8mm in a way that is slightly less than half a wrap. The wrapped adhesive tape part should be at least 200mm long. The brass rod should be long enough to leave a section at one end without adhesive tape for connecting wires. The adhesive tape is stretched during wrapping, as follows: adhesive tape with a breaking elongation of less than 40%: stretch no more than 20%; adhesive tape with a breaking elongation of 40% to 100% stretches about 20% to 30%; adhesive tape with a breaking elongation of more than 100% stretches about 30% to 50%. Thermosetting adhesive tapes should be cured immediately after wrapping according to the conditions specified by the manufacturer. Prepare a sufficient number of specimens according to the provisions of Chapter 8 of GB11026.1. Each group of specimens at each aging temperature should be no less than 5. During wrapping, if the actual stretch length is slightly deviated, it will not affect the test results. The tension during wrapping should be constant. The same tension must be used for adhesive tapes with the same substrate. 8.1.2 Procedure
The breakdown test should be carried out in accordance with GB1408, using the method of continuously increasing voltage. The average time from the start of pressure application to the breakdown of the sample should be 1020s. Before the test, a 100mm wide metal box is wrapped in the middle of the sample as an electrode, and a brass rod is used as the other electrode. Determine the original breakdown voltage value in accordance with Article 8.1 of GB11026.1. The oven used should comply with the provisions of GB11026. Carry out aging test in accordance with the provisions of GB11026.1. The sample is placed vertically in the oven with the end without adhesive tape facing down. After the sample is taken out, it needs to be placed in a standard environment of 23±2℃ and relative humidity of 45%~55% for 24h, and then the breakdown test is carried out. 8.1.3 Evaluation
Evaluate in accordance with GB11026 to determine the long-term heat resistance of the adhesive tape. 8.2 Mass loss
8.2.1 Sample
Take 15 adhesive tape samples with a length of 100mm and a width of 25mm, and determine their original mass values according to Article 8.1 of GB11026.1, accurate to 0.1mg.
8.2.2 Randomly divide the samples into three groups, 5 in each group, and put them into three ovens with different aging temperatures. The samples can be hung freely on a light metal rack or placed in a vertically placed loose-mouthed test tube. The oven used should comply with the provisions of GB11026. Carry out aging test according to the provisions of GB11026.1. After the sample is taken out, it needs to be placed in a desiccator for 24h, and then its mass value is determined, accurate to 0.1mg. After weighing, the sample continues to age. 8.2.3 Evaluation
Evaluate according to GB11026.1 to determine the long-term heat resistance of the adhesive tape. 16
Curing properties of thermosetting adhesive tape
9. Adhesion of primary heat treatment (adhesive facing substrate) 9.1.1 Apparatus
JB/T5970-91
Pressing tape: can be selected from Appendix A;
Metal plate or glass plate: smooth surface, area of about 600mm×200mm; b.
50g magnetic code with clip.
9.1.2 Samples
Take samples according to the method in 7.3, each with a length of 150mm and a width of 12mm, and take 16 samples in total. If the width of the tape is greater than 12mm, cut 12mm in the middle of the tape as a sample. Use a sharp knife to cut the sample to avoid edge damage.
Prepare three samples on the glass plate according to the above method. Gently press the adhesive side of one tape onto the back of the other tape, with a bonding area of 12 mm × 12 mm and a deviation of ±0.3 mm. Without any additional pressure, roll the roller back and forth twice on the bonding surface at a speed of approximately 10 mm/s.
9.1.3 Procedure
Each sample is hung with a 50 g base code with a clip and then hung in an oven at the temperature specified in the product standard. If the bonding difference surface is not completely separated after 20 minutes, it is considered to have passed.
9.1.4 Results
Record the number of passed and failed tests. Three samples are considered qualified. 9.2 Adhesion after heat treatment (adhesive facing substrate) 9.2.1 Apparatus
The press code can be selected from Appendix A:
b Smooth metal plate or glass plate, area approximately 600 mm × 200 mm; e, magnetic code with 5006 clips.
9.2.2 Test specimens
Prepare three test specimens according to the method described in Article 9.1.2. 9.2.3 Procedure
The three test specimens are connected in an oven at the temperature specified in the product standard. After the specified time, a 500g magnetic code with a ferrite is hung on each specimen and hung within 15:00. Before the code is attached, the code should be placed in the oven at the specified temperature for a certain period of time to ensure the temperature balance between the code and the oven. After the code is attached, the oven is closed and the timing is started. When 20 minutes have passed, record whether the code falls off. If it does not fall off, it is considered to have passed. 9.2.4 Results
Record the number of passed and failed specimens. Three passed specimens are considered to be qualified. 3 Tensile strength and break length
10.1 Apparatus
The force indication value of the tensile testing machine should be able to read 1% of the breaking load, and it should be equipped with an automatic recording device for tensile force and elongation. 10.2 Samples
The method of Article 7.3 of this standard is adopted. The length of the sample is 280mm, and 5 samples are taken in total. The width of the sample is 25mm, and the width of the drill tape is less than 1:25m. The width of the adhesive tape is used as the width of the sample. If the width of the adhesive tape is greater than 25mm, a 25mm wide sample is cut from the middle of the tape. The width is measured at the three points of the effective length of the sample, and the arithmetic mean is taken as the width of the sample. The thickness of the test piece is determined according to the method of Chapter 4 of this standard. 13.3 Procedure
The test piece is flat and placed in the head. And ensure that the sample does not slide in the head. For adhesive tapes with a tearing rate of 50% or less, the actual tearing distance is 200mm; for adhesive tapes with a breaking elongation greater than 0.9, the tearing distance is 100mm. The tensile speed is 50 mm/min for tapes with elongation at break equal to or greater than 0.1 mm; 30 im/min for tapes with elongation at break greater than 20%. Record the maximum tensile load and tear length. The elongation at break is calculated using the increase in the distance between the chuck and the clamp. If the specimen breaks within mm of the chuck or within the chuck, it is invalid. 10.4. Calculation 10.4.1 Tensile strength 5 is calculated according to formula (1): Tensile strength of the specimen, N.1 m (width) x mm (thickness): F-maximum load when the specimen breaks; b-test width, length, test width: 0.4.2 Breaking Stop length according to (2 formula:
-specimen breaking time distance, :
L, sample breaking time distance, L.-test details during the tensile test distance. m. 30.5 Results
Take the median of 5 measurements as the trial value, and record the maximum and minimum values. Summer 1
Adhesion
31.1 Device
Stainless steel plate size is %,: 64 <2mm, see 5 pieces. Along the long edge of the steel plate, 50mm from the end, 12.20 or 30mm intervals are made into 5 points, and the light is measured. The direction of the light should be parallel to the long side of the plate. Surface roughness, wheel home calculation flat groove net hope a company.05u1 Sample
Take 15 adhesive tape samples with a length of 100mm and a width of 25mm, and determine their original mass value according to Article 8.1 of GB11026.1, accurate to 0.1mg.
8.2.2 Randomly divide the samples into three groups, 5 in each group, and put them into three ovens with different aging temperatures. The samples can be hung freely on a light metal rack or placed in a vertically placed loose-mouthed test tube. The oven used should comply with the provisions of GB11026. Carry out aging test according to the provisions of GB11026.1. After the sample is taken out, it needs to be placed in a dryer for 24h, and then its mass value is determined, accurate to 0.1mg. After weighing, the sample continues to age. 8.2.3 Evaluation
Evaluate according to GB11026.1 to determine the long-term heat resistance of the adhesive tape. 16
Curing properties of thermosetting adhesive tape
9. Adhesion of primary heat treatment (adhesive facing substrate) 9.1.1 Apparatus
JB/T5970-91
Pressing tape: can be selected from Appendix A;
Metal plate or glass plate: smooth surface, area of about 600mm×200mm; b.
50g magnetic code with clip.
9.1.2 Samples
Take samples according to the method in 7.3, each with a length of 150mm and a width of 12mm, and take 16 samples in total. If the width of the tape is greater than 12mm, cut 12mm in the middle of the tape as a sample. Use a sharp knife to cut the sample to avoid edge damage.
Prepare three samples on the glass plate according to the above method. Gently press the adhesive side of one tape onto the back of the other tape, with a bonding area of 12 mm × 12 mm and a deviation of ±0.3 mm. Without any additional pressure, roll the roller back and forth twice on the bonding surface at a speed of approximately 10 mm/s.
9.1.3 Procedure
Each sample is hung with a 50 g base code with a clip and then hung in an oven at the temperature specified in the product standard. If the bonding difference surface is not completely separated after 20 minutes, it is considered to have passed.
9.1.4 Results
Record the number of passed and failed tests. Three samples are considered qualified. 9.2 Adhesion after heat treatment (adhesive facing substrate) 9.2.1 Apparatus
The press code can be selected from Appendix A:
b Smooth metal plate or glass plate, area approximately 600 mm × 200 mm; e, magnetic code with 5006 clips.
9.2.2 Test specimens
Prepare three test specimens according to the method described in Article 9.1.2. 9.2.3 Procedure
The three test specimens are connected in an oven at the temperature specified in the product standard. After the specified time, a 500g magnetic code with a ferrite is hung on each specimen and hung within 15:00. Before the code is attached, the code should be placed in the oven at the specified temperature for a certain period of time to ensure the temperature balance between the code and the oven. After the code is attached, the oven is closed and the timing is started. When 20 minutes have passed, record whether the code falls off. If it does not fall off, it is considered to have passed. 9.2.4 Results
Record the number of passed and failed specimens. Three passed specimens are considered to be qualified. 3 Tensile strength and break length
10.1 Apparatus
The force indication value of the tensile testing machine should be able to read 1% of the breaking load, and it should be equipped with an automatic recording device for tensile force and elongation. 10.2 Samples
The method of Article 7.3 of this standard is adopted. The length of the sample is 280mm, and 5 samples are taken in total. The width of the sample is 25mm, and the width of the drill tape is less than 1:25m. The width of the adhesive tape is used as the width of the sample. If the width of the adhesive tape is greater than 25mm, a 25mm wide sample is cut from the middle of the tape. The width is measured at the three points of the effective length of the sample, and the arithmetic mean is taken as the width of the sample. The thickness of the test piece is determined according to the method of Chapter 4 of this standard. 13.3 Procedure
The test piece is flat and placed in the head. And ensure that the sample does not slide in the head. For adhesive tapes with a tearing rate of 50% or less, the actual tearing distance is 200mm; for adhesive tapes with a breaking elongation greater than 0.9, the tearing distance is 100mm. The tensile speed is 50 mm/min for tapes with elongation at break equal to or greater than 0.1 mm; 30 im/min for tapes with elongation at break greater than 20%. Record the maximum tensile load and tear length. The elongation at break is calculated using the increase in the distance between the chuck and the clamp. If the specimen breaks within mm of the chuck or within the chuck, it is invalid. 10.4. Calculation 10.4.1 Tensile strength 5 is calculated according to formula (1): Tensile strength of the specimen, N.1 m (width) x mm (thickness): F-maximum load when the specimen breaks; b-test width, length, test width: 0.4.2 Breaking Stop length according to (2 formula:
-specimen breaking time distance, :
L, sample breaking time distance, L.-test details during the tensile test distance. m. 30.5 Results
Take the median of 5 measurements as the trial value, and record the maximum and minimum values. Summer 1
Adhesion
31.1 Device
Stainless steel plate size is %,: 64 <2mm, see 5 pieces. Along the long edge of the steel plate, 50mm from the end, 12.20 or 30mm intervals are made into 5 points, and the light is measured. The direction of the light should be parallel to the long side of the plate. Surface roughness, wheel home calculation flat groove net hope a company.05u1 Sample
Take 15 adhesive tape samples with a length of 100mm and a width of 25mm, and determine their original mass value according to Article 8.1 of GB11026.1, accurate to 0.1mg.
8.2.2 Randomly divide the samples into three groups, 5 in each group, and put them into three ovens with different aging temperatures. The samples can be hung freely on a light metal rack or placed in a vertically placed loose-mouthed test tube. The oven used should comply with the provisions of GB11026. Carry out aging test according to the provisions of GB11026.1. After the sample is taken out, it needs to be placed in a dryer for 24h, and then its mass value is determined, accurate to 0.1mg. After weighing, the sample continues to age. 8.2.3 Evaluation
Evaluate according to GB11026.1 to determine the long-term heat resistance of the adhesive tape. 16
Curing properties of thermosetting adhesive tape
9. Adhesion of primary heat treatment (adhesive facing substrate) 9.1.1 Apparatus
JB/T5970-91
Pressing tape: can be selected from Appendix A;
Metal plate or glass plate: smooth surface, area of about 600mm×200mm; b.
50g magnetic code with clip.
9.1.2 Samples
Take samples according to the method in 7.3, each with a length of 150mm and a width of 12mm, and take 16 samples in total. If the width of the tape is greater than 12mm, cut 12mm in the middle of the tape as a sample. Use a sharp knife to cut the sample to avoid edge damage.
Prepare three samples on the glass plate according to the above method. Gently press the adhesive side of one adhesive tape onto the back of the other tape, with a bonding area of 12 mm × 12 mm and a deviation of ±0.3 mm. Without any additional pressure, roll the roller back and forth twice on the bonding surface at a speed of approximately 10 mm/s.
9.1.3 Procedure
Each sample is hung with a 50 g base code with a clip and then hung in an oven at the temperature specified in the product standard. If the bonding difference surface is not completely separated after 20 minutes, it is considered to have passed.
9.1.4 Results
Record the number of passed and failed tests. Three samples are considered qualified. 9.2 Adhesion after heat treatment (adhesive facing substrate) 9.2.1 Apparatus
The press code can be selected from Appendix A:
b Smooth metal or glass plate, area approximately 600 mm × 200 mm; e, magnetic code with 5006 clips.
9.2.2 Test specimens
Prepare three test specimens according to the method described in Article 9.1.2. 9.2.3 Procedure
The three test specimens are connected in an oven at the temperature specified in the product standard. After the specified time, a 500g magnetic code with a ferrite is hung on each specimen and hung within 15:00. Before the code is attached, the code should be placed in the oven at the specified temperature for a certain period of time to ensure the temperature balance between the code and the oven. After the code is attached, the oven is closed and the timing is started. When 20 minutes have passed, record whether the code falls off. If it does not fall off, it is considered to have passed. 9.2.4 Results
Record the number of passed and failed specimens. Three passed specimens are considered to be qualified. 3 Tensile strength and break length
10.1 Apparatus
The force indication value of the tensile testing machine should be able to read 1% of the breaking load, and it should be equipped with an automatic recording device for tensile force and elongation. 10.2 Samples
The method of Article 7.3 of this standard is adopted. The length of the sample is 280mm, and 5 samples are taken in total. The width of the sample is 25mm, and the width of the drill tape is less than 1:25m. The width of the adhesive tape is used as the width of the sample. If the width of the adhesive tape is greater than 25mm, a 25mm wide sample is cut from the middle of the tape. The width is measured at the three points of the effective length of the sample, and the arithmetic mean is taken as the width of the sample. The thickness of the test piece is determined according to the method of Chapter 4 of this standard. 13.3 Procedure
The test piece is flat and placed in the head. And ensure that the sample does not slide in the head. For adhesive tapes with a tearing rate of 50% or less, the actual tearing distance is 200mm; for adhesive tapes with a breaking elongation greater than 0.9, the tearing distance is 100mm. The tensile speed is 50 mm/min for tapes with elongation at break equal to or greater than 0.1 mm; 30 im/min for tapes with elongation at break greater than 20%. Record the maximum tensile load and tear length. The elongation at break is calculated using the increase in the distance between the chuck and the clamp. If the specimen breaks within mm of the chuck or within the chuck, it is invalid. 10.4. Calculation 10.4.1 Tensile strength 5 is calculated according to formula (1): Tensile strength of the specimen, N.1 m (width) x mm (thickness): F-maximum load when the specimen breaks; b-test width, length, test width: 0.4.2 Breaking Stop length according to (2 formula:
-specimen breaking time distance, :
L, sample breaking time distance, L.-test details during the tensile test distance. m. 30.5 Results
Take the median of 5 measurements as the trial value, and record the maximum and minimum values. Summer 1
Adhesion
31.1 Device
Stainless steel plate size is %,: 64 <2mm, see 5 pieces. Along the long edge of the steel plate, 50mm from the end, 12.20 or 30mm intervals are made into 5 points, and the light is measured. The direction of the light should be parallel to the long side of the plate. Surface roughness, wheel home calculation flat groove net hope a company.05u3 methods are used. The length of the sample is 280mm, and 5 samples are taken in total. The width of the sample is 25mm, and the width of the drill tape is 1:25m. The width of the adhesive tape is used as the width of the sample. If the width of the adhesive tape is greater than 25mm, a 25mm wide sample is cut from the middle of the tape. The width is measured at approximately three equal parts of the effective length of the sample, and the arithmetic mean is used as the width of the sample. The thickness of the test piece is determined according to the method in Chapter 4 of this standard. 13.3 Procedure
The test piece is flat and placed in the center. And ensure that the sample does not slide in the center. For adhesive tapes with a tearing rate of 50% or less, the actual tearing distance is 200mm; for adhesive tapes with a breaking elongation greater than 0.9, the tearing distance is 100mm. The tensile speed is 50 mm/min for tapes with elongation at break equal to or greater than 0.1 mm; 30 im/min for tapes with elongation at break greater than 20%. Record the maximum tensile load and tear length. The elongation at break is calculated using the increase in the distance between the chuck and the clamp. If the specimen breaks within mm of the chuck or within the chuck, it is invalid. 10.4. Calculation 10.4.1 Tensile strength 5 is calculated according to formula (1): Tensile strength of the specimen, N.1 m (width) x mm (thickness): F-maximum load when the specimen breaks; b-test width, length, test width: 0.4.2 Breaking Stop length according to (2 formula:
-specimen breaking time distance, :
L, sample breaking time distance, L.-test point distance during stretching. m. 30.5 Result
Take the median of 5 measurements as the trial value, and record the maximum and minimum values. Summer 1
Adhesion
31.1 Device
Stainless steel plate size is %,: 64<2mm, see 5 pieces. Make 5 equidistant points along the long edge of the steel plate starting from 50mm from the end with an interval of 12.20 or 30mm, report the table high light, and the direction of the light should be parallel to the long side of the plate. Surface roughness, wheel home calculation flat groove net hope a company.05u3 methods are used. The length of the sample is 280mm, and 5 samples are taken in total. The width of the sample is 25mm, and the width of the drill tape is 1:25m. The width of the adhesive tape is used as the sample width. If the width of the adhesive tape is greater than 25mm, a 25mm wide sample is cut from the middle of the tape. The width is measured at approximately three equal parts of the effective length of the sample, and the arithmetic mean is used as the sample width. The test thickness is determined according to the method in Chapter 4 of this standard. 13.3 Procedure
The test tape is flat and placed in the head. And ensure that the sample does not slide in the head. For adhesive tapes with a tearing rate of 50% or less, the actual tearing distance is 200mm; for adhesive tapes with a breaking elongation greater than 0.9, the tearing distance is 100mm. The tensile speed is 50 mm/min for tapes with elongation at break equal to or greater than 0.1 mm; 30 mm/min for tapes with elongation at break greater than 20%. Record the maximum tensile load and tear value. The elongation at break is calculated using the increase in the distance between the chuck and the clamp. The specimen is invalid if it breaks within mm of the chuck or within the chuck. 10.4. Calculation 10.4.1 Tensile strength 5 Calculate according to formula (1): Tensile strength of the specimen, N.1 m (width) x mm (thickness): F-maximum load when the specimen breaks; b-test width, length, test width: 0.4.2 Breaking Stop length according to (2 formula:
-specimen breaking time distance, :
L, sample breaking time distance, L.-test details during the tensile test distance. m. 30.5 Results
Take the median of 5 measurements as the trial value, and record the maximum and minimum values. Summer 1
Adhesion
31.1 Device
Stainless steel plate size is %,: 64 <2mm, see 5 pieces. Along the long edge of the steel plate, 50mm from the end, 12.20 or 30mm intervals are made into 5 points, and the light is measured. The direction of the light should be parallel to the long side of the plate. Surface roughness, wheel home calculation flat groove net hope a company.05u
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