HG/T 3042-1989 Pure rubber hose and rubber hose for conveying conventional liquid fuel in internal combustion engine fuel system
Some standard content:
Chemical Industry Standard of the People's Republic of China
Rubber tubing and hoses for fuel circuitsforinternal combustion enginesusing conventional liquid fuelsHG/T 3042-1989 (1997)
Replaces GB10542-89
This standard equivalently adopts the international standard SO4639.1-1987 "Specification for rubber tubing and hoses for fuel circuits for internal combustion engines - Part 1: Conventional liquid fuels".
1 Subject content and scope of application
This standard specifies the technical requirements and test methods for rubber tubing and hoses for conveying conventional liquid fuels (including non-oxidizing compounds).
This standard applies to rubber tubing and hoses for conveying conventional liquid fuels (including non-oxidizing compounds) in internal combustion engine fuel systems. 2 Reference standards
Determination of tensile properties of vulcanized rubber
GB1189
GB1683
GB1690
GB1804
GB2941
GB3512
GB3672
GB5562
GB5563
GB5564
GB5567
GB6031
GB9571|| tt||GB9573
GB9576
GB9577
Appearance quality of hose
Determination method of permanent deformation of vulcanized rubber by constant deformation compression Test method of liquid resistance of vulcanized rubber
Tolerance and fit Limit deviation of dimensions without tolerance Standard temperature, humidity and time for parking and testing of rubber specimens Test method for hot air aging of rubber
Dimensional tolerance of molded and extruded solid rubber Physical test method for hose rubber layer
Hydraulic test method for hose
Test method for low temperature bending of hoses
Test method for vacuum resistance of hoses
Conventional test method for determination of international hardness of vulcanized rubber (30-85 IRHID) Evaluation of ozone resistance of rubber and plastic hoses under static conditions Dimension measurement method of rubber, plastic hoses and hose assemblies Selection, storage, use and maintenance guide of rubber, plastic hoses and hose assemblies Marking, packaging and transportation rules of rubber, plastic hoses and hose assemblies 3 Product types and sizes
3.1 Type
The pure rubber hose and rubber hose specified in this standard are divided into three types: approved by the Ministry of Chemical Industry of the People's Republic of China on February 1, 1989 and implemented on December 1, 1989
HG/T3042-1989 (1997)
Type 1 is a pure rubber hose with a maximum working pressure of 0.12MPa; Type 2 is a rubber hose with a working pressure from 0.00 to 0.12MPa (including 0.12MPa); Type 3 is a rubber hose with a working pressure from 0.00 to 0.30MPa (including 0.30MPa). 3.2 Grade
Type 1 pure rubber hose and Type 2 and Type 3 rubber hoses are divided into two grades: Grade A is a pure rubber hose and rubber hose used in an environment with a temperature of up to 100℃; Grade B
is a pure rubber hose and rubber hose used in an environment with a temperature of up to 125℃. 3.3 Dimensions
3.3.1 Pure rubber hose
The inner diameter and wall thickness of pure rubber hose shall comply with the provisions of Table 1. The tolerance value shall be selected within the appropriate range specified in GB3672. Table 1 Inner diameter and wall thickness
Nominal inner diameter
Nominal wall thickness
Note: The reference diameter of the connector on which the pure rubber hose is installed is 4, 4.5, 6, 8, 10, 12, 14mm. 3.3.2 Rubber hose
The dimensions, tolerances and concentricity of rubber hoses shall comply with the requirements of Tables 2 and 3. Table 2 Hose size
Nominal inner diameter
Nominal outer diameter
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Technical requirements
4.1 Rubber material
3.5 or less (including 3.5)
3.5 or more
Rubber material performance requirements are shown in Table 4.
Performance Items
Minimum value of tensile strength
Minimum value of elongation at break
Hot air aging
Grade A 100℃×70+h
100℃×70*h
Hardness change\)
Minimum value of change rate of tensile strength
Minimum value of change rate of elongation at break
Compression change
Maximum value
Type 1 100℃×24h
Type 2 and Type 3. Grade A 1 00℃×70+3h
B grade 125℃×70*h
Volume change rate of resistance to liquid CbZxz.net
Maximum value
Minimum value
Volume change rate of resistance to standard oil No. 3
Maximum value
Minimum value
HG/T3042-1989（1997)
Table 3 Hose concentricity
Table 4 Rubber material performance requirements
Note: 1) After aging, the maximum absolute value of hardness is 85IRHD. 4.2 Pure rubber hose and rubber hose
The properties of pure rubber hose and rubber hose are shown in Table 5.
Maximum concentricity deviation
Performance index
Pure rubber hose
Rubber hose
Inner rubber layer
Outer rubber layer
Leakage test
Tensile test
Performance items
Minimum bursting pressure type 2
Adhesion strength
Minimum value
Ozone resistance test after extraction
Low temperature flexure test
Clarity test
Maximum value| |tt||Insoluble impurities
Maximum value of fuel soluble matter
Maximum value of waxy matter extraction
Pure rubber hose and Grade A rubber hose
Grade B rubber hose
Maximum value of tensile permanent deformation
Grade A 100±1℃
Grade B 125±IC
Maximum value of liquid C penetration
Minimum value of tear strength
Vacuum resistance
5 Test methods
HG/T 3042 --1989 (1997)
Table 5 Performance requirements for pure rubber hose and rubber hose
g/(m224h）
Performance requirements
Pure rubber hose
No leakage
No breakage (no slippage)
Rubber hose
Observe at twice the magnification, no turtle attack
Observe at twice the magnification, no turtle attack
Inner rubber
Outer rubber
Ball can pass freely
5.1 The specimen can be cut from the pure rubber hose and rubber hose, or it can be made by vulcanizing the rubber material used to make the pure rubber hose and rubber hose under the same vulcanization conditions as the pure rubber hose and rubber hose. 5.2 The hardness of the rubber material shall be determined in accordance with GB6031. 5.3 The tensile strength and elongation at break of the rubber material shall be determined in accordance with GB528. 5.4 The aging resistance test of rubber shall be carried out in accordance with GB3512. 5.5 The compression deformation test of rubber shall be carried out in accordance with GB1683. 5.6 The liquid resistance test of rubber shall be carried out in accordance with GB1690. 5.6.1 For the pure rubber hose rubber and the inner rubber of the rubber hose, the test liquid C is used, the immersion temperature is the test room temperature, and the immersion time is 70h
5.6.2 For the pure rubber hose rubber and the inner and outer rubber of the rubber hose, No. 3 standard oil is used, the immersion temperature is 100℃, and the immersion time is 70h. 5.7: Leakage test method (only for pure rubber hose): The two ends of a section of pure rubber hose sample are respectively placed on the polished ends of two metal conduits processed according to the tolerance H14 specified in GB1804 and the diameter is equivalent to the value shown in the note of Table 1. The length of the placement is three times the nominal inner diameter of the pure rubber hose to make a pure rubber hose assembly. The airtight test is carried out according to the test method of GB5563, and the pure rubber hose should have no leakage. The test conditions are as follows:
Test medium: liquid C;
Pressure: 0.12MPa;
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Duration: 2min.
5.8 Tensile test (only for pure rubber hose): HG/T3042-1989 (1997)
Put a section of pure rubber hose on the end of a section of metal conduit according to the method described in 5.7. Then, lift the assembly to a vertical position and make the other end that is plugged bear a load of 10N. Use a pressure gauge to gradually increase the air pressure in the hose to 0.25MPa and maintain it for 2nin. The pure rubber hose shall not break or slip off. 5.9 The minimum burst pressure test shall be carried out in accordance with GB5563. 5.10 The adhesion strength test shall be carried out in accordance with GB5562. This test is only applicable to rubber hoses. 5.11 Test of ozone resistance after immersion in liquid C: Take a rubber hose or pure rubber hose of suitable length, plug both ends of the hose, but do not extend the hose body, then immerse the sample in a sufficient amount of liquid C at room temperature, take it out after 72 hours, dry it at 40℃ for 72 hours, and test it under the following conditions according to GB9571. After the test, magnify the two sides and observe that there should be no cracks. Test conditions:
Ozone concentration: 50±5pphm;
Continuous test time: 70*3h;
Elongation: 20%;
Temperature: 40℃.
5.12 Low temperature bending test is carried out according to GB5564. Test conditions:
Empty pure rubber hose or rubber hose: park at -25±2℃ for 24h; pure rubber hose or rubber hose filled with liquid C: park at -40±2℃ for 70*2h. The time between the filling of C liquid and the start of cooling of pure rubber hose or rubber hose shall not exceed 30 minutes. The bending radius shall be 12 times (rubber hose) or 25 times (pure rubber hose) of the nominal inner diameter. After the test, there shall be no cracks when the tube is magnified twice.
5.13 The content of insoluble impurities, the content of fuel soluble matter and the content of extractable waxy matter shall be determined according to the method specified in Appendix A. 5.14 Tensile permanent deformation
This test is applicable to the inner and outer rubber layers of pure rubber hose and hose. The test shall be carried out according to Appendix B. The sample shall be stretched to 1.5 times the length between the original markings and maintained for 24 hours at a temperature corresponding to the working temperature of each level of hose. 5.15 The penetration of liquid C shall be determined according to the method specified in Appendix C. 5.16 The tear strength of pure rubber hose shall be determined according to the method specified in Appendix D. 5.17 The vacuum resistance test of pure rubber hose and rubber hose shall be carried out according to GB5567. Test conditions. Test pressure: 80kPa;
Duration: 1560s;
True ball diameter: 0.8 times of nominal inner diameter.
6 Inspection rules 1)
6.1 Rubber hoses shall be inspected for appearance quality item by item in accordance with GB1189. 6.2 Rubber hose dimensions and concentricity shall be in accordance with GB9573. 6.3 Rubber hoses of the same model and grade but different specifications are grouped as one batch. The number of each batch shall not exceed 2000.
Select one specification from each batch of pure rubber hoses or rubber hoses as a representative. 6.4 Randomly sample ~ pieces to inspect various physical and mechanical properties, and conduct leakage tests and burst pressure tests. Instructions for use:
1] This content is not included in ISO4639.1.
1/130421989（1997)
6.5 If one of the test items fails, double the test sample should be taken from the same batch of products, and the failed item should be retested. If one of the test items still fails after the retest, the batch of products is considered unqualified. 6.6 Rubber hoses and pure rubber hoses should be inspected and accepted in batches by the manufacturer's technical inspection department, and each batch of products must be accompanied by a quality certificate before leaving the factory. 7 Marking, packaging, use and others
7.1 The marking, packaging and transportation of pure rubber hoses and rubber hoses shall comply with GB9577. 7.2 The selection, storage, use and maintenance of pure rubber hoses and rubber hoses shall comply with GB9576. 44
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A1 Scope
HG/T3042-1989 (1007)
Appendix A
Clarity and extraction test
(Supplement)
This appendix specifies the determination method for the amount of insoluble impurities, C liquid solubles and extracted waxy matter produced by pure rubber hoses and rubber hoses used in liquid fuel systems.
A2 Determination method
Take a section of pure rubber hose or rubber hose sample, inject C liquid into it, leave it at room temperature for 24 hours, then empty the sample and wash it with C liquid, collect the injected and rinsed C liquid, filter out the insoluble impurities, dry and weigh them, and get the weight of the insoluble impurities; then evaporate the filtered solution, dry and weigh it, and get the weight of the C liquid soluble matter; then use methanol to extract the waxy matter from the evaporated and dried product of the above filtrate, evaporate the obtained methanol extract, dry it, and weigh it to get the weight of the waxy extract. A3 Test instruments and reagents
A3.1 Glass funnel (weighed);
A3.2 Two evaporating bloods (weighed); A3.3 Beaker;
A3.4 Fuel evaporator with hood;
A3.5 85±5℃ adjustable ventilation drying oven; A3.6 Balance accurate to 0.1mg;
A3.7 Sintered glass funnel with third-grade (G3) porosity; A3.8 Liquid C specified in GB1690;
A3.9 Methanol with a purity of at least 99%;
A3.10 Metal stopper.
A4 Operation level
A4.1 Take a 300-500mm long pure rubber hose or rubber hose sample and measure the inner diameter. Hang the sample vertically, plug the lower end of the sample with a metal plug, inject liquid C into the sample, and then plug the top of the sample with a metal plug. Calculate the inner surface area of the sample, subtract the area occupied by the metal plug, and obtain the total inner wall area of the sample in contact with liquid C. A4.2 Place the assembly at standard laboratory temperature for 24 hours, then pull out the metal plug at the end of the sample and pour the liquid C in the tube into a beaker; then pull out the metal plug at the other end, hang the sample vertically, and take 20mL of liquid C each time to inject into the sample to elute the inner wall, elute 5 times in total, and collect all the eluent in the same beaker as mentioned above; filter all the liquid in the beaker with a sintered glass funnel, and use a small amount of fresh liquid C to elute the residue in the funnel, and pour the eluent into the aforementioned beaker. Place the sintered glass funnel in a drying oven at 85 ± 5°C and dry until constant weight is reached. Subtract the weight of the funnel to obtain the total weight of insoluble impurities.
A4.3 Pour all the liquid in the beaker into the evaporating dish, place it in an evaporator with a cover, evaporate most of the C liquid, then place the evaporating dish and the residue therein in a drying oven at 85 ± 5°C and dry until constant weight is reached. Subtract the weight of the evaporating dish to obtain the total weight of soluble substances extracted from the C liquid.
A4.4 Place the evaporating dish and the residue therein under a protective cover and place them at standard laboratory temperature for at least 16 hours. Then dissolve the residue in 30 mL of methanol at standard laboratory temperature. v .17bzw
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Use a sintered glass funnel to filter the methanol solution into another (second) evaporating dish, rinse the previous evaporating blood with 10mL of fresh methanol, and filter it into the second evaporating dish using a sintered glass funnel. Place the methanol solution in the second evaporating blood under a hooded evaporator to evaporate most of the methanol, and then dry the residue at 85±5°C until constant weight is reached. Subtract the evaporation weight to get the total weight of the waxy extract. A5 Result Expression
Respectively divide the total amount of insoluble impurities, the total amount of soluble matter in liquid C, and the total amount of waxy extract by the inner wall area of the sample in contact with liquid C. The resulting values are the insoluble impurity content, the soluble matter in liquid C, and the waxy extract content per square meter of the inner wall of the sample. Material content. A6 Test report
The test report shall include the following contents:
The national standard number of this test method;
b. The national standard number of the pure rubber hose or rubber hose for this test; the test results obtained.
Appendix B
Determination method of tensile permanent deformation
(Supplement)
This appendix refers to the international standard ISO2285-1981 "Vulcanized rubber-Determination of tensile permanent deformation at room temperature and high temperature". B1 Scope
This appendix specifies the determination method of tensile permanent deformation of vulcanized rubber at room temperature and high temperature. B2 Test equipment
B2.1 Tensile device
It consists of a metal guide rod and a set of upper and lower clamps. The clamp at one end is fixed and the clamp at the other end can be moved. B2.2 High temperature box
B3 Test specimen
Use the type 1 test specimen specified in GB528.
B4 Test steps
B4.1. Before the test, print out markings with a spacing of 25±0.05mm on the type 1 test specimen, and clamp the specimen to the stretching device. B4.2 Use a stretching speed of 2-10mm/s to stretch the specimen until the spacing between the specimen markings is 1.5 times the length between the original markings. After placing it at the standard laboratory temperature for 20-30min, put it in a high temperature box at the specified temperature, take it out after 24h, and cool it for 30-50min; remove the strain at a speed of 2-10mm/s, remove the specimen, and place it freely on a wooden flat plate. After 30min, measure the length between the markings with an accuracy of 0.5mm.
B5 Result Expression
Calculate with formula (B1):
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Tensile permanent deformation %
Where: L. Original length between markings before stretching, mm; L, length between markings after stretching, mm;
L.—Length between markings after recovery, mm.
The average value of the test results of three samples should be calculated as the measurement result. L2 - Lo
Liquid C penetration test
(Supplement)
This appendix refers to the international standard ISO8308-1978 "Rubber, plastic hoses and pure rubber hoses - Determination of pipe wall properties".
C1 Scope
This appendix specifies the method for determining the resistance of pure rubber hoses and rubber hoses to liquid C penetration. C2 Test device (as shown in Figure C1)
Pressure regulator
Test principle
Main valve
Safety valve
Pressure gauge
Figure C1 Instruments for liquid penetration test
Relief valve
-Liquid penetration hose and pure rubber
Installation shield
Liquid filling valve
After maintaining the constant test pressure (50±5kPa specified in this test) for 24 hours, remove the pressure and measure the volume change of the liquid in the measuring cylinder at the top of the hose before and after pressurization, so as to calculate the weight of C liquid penetrated per square meter of hose wall every 24 hours. 47
C4 Test method
HG/T3042-1989 (1997)
C4.1 Measure the inner diameter D of the pure rubber hose or rubber hose sample and the net length L between the two end pipe joints. C4.2 Install the sample on the test device (see Figure C1), fill the sample and the measuring cylinder with the test liquid until the top of the measuring cylinder is full, then close the filling valve.
C4.3 Pressurize the measuring cylinder and the sample to 50±5kPa, close the main valve, keep it for 5 minutes, open the pressure relief valve to release the pressure, and record the liquid level in the measuring cylinder, which is the initial reading Vo. The purpose of this step is to remove the gas dissolved in the liquid. C4.4 Pressurize the measuring cylinder and the sample to 50±5kPa again, close the main valve after 24 hours, release the pressure, and record the liquid level in the measuring cylinder V24h after 5 minutes.
C5 Result Expression
(Vo- V24h ) : d
Yuan·D·L
Where: P—Liquid C penetration, g/(m224h); D—Inner diameter, m;
L—Net length, m;
d—C liquid density, Mg/m;
V24h is the volume of liquid in the measuring cylinder after pressure relief for 24h, m2; V. -The volume of liquid in the initial measuring cylinder, m2. Appendix D
Tear resistance test of pure rubber hose
(Supplement)
D1 Scope
This appendix specifies the method for the tear resistance test of pure rubber hose with a ratio of inner diameter to outer diameter less than or equal to 0.5. D2 Test Principle
A dynamometer is used to measure the force required for the specimen to extend the initial tear. D3 Test equipment
Carefully sharpened knife or razor blade.
D3.2 Inertia-free dynamometers that meet the following conditions. a. Device capable of recording the load-travel curve of the moving fixture. b. The scale load range selected should be such that the tear load value produced is within the scale range of 15% to 85% of the full scale. c. The fixture movement speed is constant at 100 ± 10 mm/min. d. A fixture head capable of clamping the specimen in an appropriate position (the specimen must not be damaged or slip off) D3.3 Thickness gauge.
Parking enclosure with standard laboratory temperature and humidity. D4 Test specimen
D4.1 Shape and size
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HG/T3042-1989 (1997)
The shape and size of the test specimen shall comply with the provisions of Figure D1. 50
Figure D1 Shape and size of the test specimen
Cut a section of the test specimen with a length of 80±1mm from the pure rubber hose, and the cross section at one end must be perpendicular to the axial direction. Use a knife to cut 30±1mm along the axial direction of the pure rubber hose from one side of any diameter position of the vertical section, and then completely cut the pure rubber hose along the axial direction from the other side of the diameter position to obtain the test specimen.
D4.2 Number of specimens
At least three specimens should be measured.
D4.3 Placement of specimens
The specimens should be placed in accordance with the provisions of GB2941.
D5 Operating procedures
First measure the thickness of the specimen, then clamp the specimen in the instrument fixture (see Figure D2), set the load scale, and start stretching the specimen until the specimen is torn along the entire length.
Figure D2·Position of the specimen in the fixture
Result calculation and expression
The average value of the tear strength, expressed in kN, is obtained as follows: remove 10% of the load at the head and tail of the AB part of the measured curve (as shown in Figure D3) to obtain the CD part. a.
·49·1Measure the inner diameter D of the pure rubber hose or rubber hose sample, and the net length L between the two end pipe joints. C4.2Install the sample on the test device (see Figure C1), fill the sample and the measuring cylinder with test liquid until the top of the measuring cylinder is full of scale, then close the filling valve.
C4.3Press the measuring cylinder and the sample to 50±5kPa, close the main valve, keep it for 5min, open the pressure relief valve to release the pressure, and record the liquid level in the measuring cylinder, which is the initial reading Vo. The purpose of this step is to exclude the gas dissolved in the liquid. C4.4Press the measuring cylinder and the sample to 50±5kPa again, close the main valve after 24h, release the pressure, and record the liquid level in the measuring cylinder V24h after 5min.
C5 Result Expression
(Vo- V24h ) : d
Yuan·D·L
Where: P—Liquid C penetration, g/(m224h); D—Inner diameter, m;
L—Net length, m;
d—C liquid density, Mg/m;
V24h is the volume of liquid in the measuring cylinder after pressure relief for 24h, m2; V. -The volume of liquid in the initial measuring cylinder, m2. Appendix D
Tear resistance test of pure rubber hose
(Supplement)
D1 Scope
This appendix specifies the method for the tear resistance test of pure rubber hose with a ratio of inner diameter to outer diameter less than or equal to 0.5. D2 Test Principle
A dynamometer is used to measure the force required for the specimen to extend the initial tear. D3 Test equipment
Carefully sharpened knife or razor blade.
D3.2 Inertia-free dynamometers that meet the following conditions. a. Device capable of recording the load-travel curve of the moving fixture. b. The scale load range selected should be such that the tear load value produced is within the scale range of 15% to 85% of the full scale. c. The fixture movement speed is constant at 100 ± 10 mm/min. d. A fixture head capable of clamping the specimen in an appropriate position (the specimen must not be damaged or slip off) D3.3 Thickness gauge.
Parking enclosure with standard laboratory temperature and humidity. D4 Test specimen
D4.1 Shape and size
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HG/T3042-1989 (1997)
The shape and size of the test specimen shall comply with the provisions of Figure D1. 50
Figure D1 Shape and size of the test specimen
Cut a section of the test specimen with a length of 80±1mm from the pure rubber hose, and the cross section at one end must be perpendicular to the axial direction. Use a knife to cut 30±1mm along the axial direction of the pure rubber hose from one side of any diameter position of the vertical section, and then completely cut the pure rubber hose along the axial direction from the other side of the diameter position to obtain the test specimen.
D4.2 Number of specimens
At least three specimens should be measured.
D4.3 Placement of specimens
The specimens should be placed in accordance with the provisions of GB2941.
D5 Operating procedures
First measure the thickness of the specimen, then clamp the specimen in the instrument fixture (see Figure D2), set the load scale, and start stretching the specimen until the specimen is torn along the entire length.
Figure D2·Position of the specimen in the fixture
Result calculation and expression
The average value of the tear strength, expressed in kN, is obtained as follows: remove 10% of the load at the head and tail of the AB part of the measured curve (as shown in Figure D3) to obtain the CD part. a.
·49·1Measure the inner diameter D of the pure rubber hose or rubber hose sample, and the net length L between the two end pipe joints. C4.2Install the sample on the test device (see Figure C1), fill the sample and the measuring cylinder with test liquid until the top of the measuring cylinder is full of scale, then close the filling valve.
C4.3Press the measuring cylinder and the sample to 50±5kPa, close the main valve, keep it for 5min, open the pressure relief valve to release the pressure, and record the liquid level in the measuring cylinder, which is the initial reading Vo. The purpose of this step is to exclude the gas dissolved in the liquid. C4.4Press the measuring cylinder and the sample to 50±5kPa again, close the main valve after 24h, release the pressure, and record the liquid level in the measuring cylinder V24h after 5min.
C5 Result Expression
(Vo- V24h ) : d
Yuan·D·L
Where: P—Liquid C penetration, g/(m224h); D—Inner diameter, m;
L—Net length, m;
d—C liquid density, Mg/m;
V24h is the volume of liquid in the measuring cylinder after pressure relief for 24h, m2; V. -The volume of liquid in the initial measuring cylinder, m2. Appendix D
Tear resistance test of pure rubber hose
(Supplement)
D1 Scope
This appendix specifies the method for the tear resistance test of pure rubber hose with a ratio of inner diameter to outer diameter less than or equal to 0.5. D2 Test Principle
A dynamometer is used to measure the force required for the specimen to extend the initial tear. D3 Test equipment
Carefully sharpened knife or razor blade.
D3.2 Inertia-free dynamometers that meet the following conditions. a. Device capable of recording the load-travel curve of the moving fixture. b. The scale load range selected should be such that the tear load value produced is within the scale range of 15% to 85% of the full scale. c. The fixture movement speed is constant at 100 ± 10 mm/min. d. A fixture head capable of clamping the specimen in an appropriate position (the specimen must not be damaged or slip off) D3.3 Thickness gauge.
Parking enclosure with standard laboratory temperature and humidity. D4 Test specimen
D4.1 Shape and size
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HG/T3042-1989 (1997)
The shape and size of the test specimen shall comply with the provisions of Figure D1. 50
Figure D1 Shape and size of the test specimen
Cut a section of the test specimen with a length of 80±1mm from the pure rubber hose, and the cross section at one end must be perpendicular to the axial direction. Use a knife to cut 30±1mm along the axial direction of the pure rubber hose from one side of any diameter position of the vertical section, and then completely cut the pure rubber hose along the axial direction from the other side of the diameter position to obtain the test specimen.
D4.2 Number of specimens
At least three specimens should be measured.
D4.3 Placement of specimens
The specimens should be placed in accordance with the provisions of GB2941.
D5 Operating procedures
First measure the thickness of the specimen, then clamp the specimen in the instrument fixture (see Figure D2), set the load scale, and start stretching the specimen until the specimen is torn along the entire length.
Figure D2·Position of the specimen in the fixture
Result calculation and expression
The average value of the tear strength, expressed in kN, is obtained as follows: remove 10% of the load at the head and tail of the AB part of the measured curve (as shown in Figure D3) to obtain the CD part. a.
·49·
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