The glow wire test specified in this standard uses simulation technology to evaluate the fire hazard caused by thermal stress in a short period of time due to heat sources such as hot parts or overload resistors. This standard applies to electrical and electronic equipment and their parts and components, and also to solid electrical insulating materials or other solid combustible materials. GB/T 5169.10-1997 Test method for fire hazard test of electrical and electronic products Glow wire test method - General GB/T5169.10-1997 Standard download decompression password: www.bzxz.net

GB/T 5169.10—1997
This standard is equivalent to the International Electrotechnical Commission IEC695-2-1/0 (1994-03, 1st edition) "Fire hazard testing for electric and electronic products Part 2 Test methods Part 1/Chapter 0 Glow-wire test method---General principles", which is a revision of GB5169.4--85. GB5169.4-85 "Glow-wire test method and guidance for fire hazard test of electric and electronic products" is replaced by the following standards: GB/T5169.10-1997 (idtIEC695-2-1/0:1994) Fire hazard test of electric and electronic products Test method Glow-wire
Test method - General
GB/T5169.11--1997 (idtIEC695-2-1/1:1994) Fire hazard test of electric and electronic products Glow-wire test and guidance || tt||Test method
Finished product
IEC695-2-1/2:1994 Fire hazard testing for electric and electronic products Part 2 Test methods Part 1/Chapter 2
Glow-wire test for flammability
IEC695-2-1/3:1994 Fire hazard testing for electric and electronic products Part 2 Test methods Part 1/Chapter 3 Materials
Glow-wire test for ignitability
This standard is used together with GB/T5169.11-1997. This standard was first issued in 1985.
This standard replaces GB5169.4-85 from the date of implementation. This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Conditions and Environmental Tests for Electric and Electronic Products. This standard is drafted by Guangzhou Electric Science Research Institute. The main drafters of this standard are Yao Daiyue and Liu. This standard is entrusted to Guangzhou Electric Science Research Institute for interpretation. 494
GB/T5169.10--1997
IEC Foreword
1) IEC (International Electrotechnical Commission) is a worldwide standardization organization composed of national electrotechnical committees (IEC National Committees). The IEC mission is to promote international cooperation on various standardization issues in the field of electrical and electronic engineering. To this end, in addition to organizing other activities, it also publishes various international standards and entrusts the formulation of IEC international standards to technical committees. Any IEC National Committee interested in the issue under discussion can participate in this formulation work. International organizations, governmental organizations and non-governmental organizations that have established relations with IEC can also participate in this formulation work. IEC works closely with the International Organization for Standardization (ISO) under the conditions stipulated in the agreement it has reached with it. 2) IEC's formal resolutions or agreements on technical issues are formulated by technical committees represented by national committees that are particularly interested in the issue, and express the international consensus on the issue as accurately as possible. 3) These resolutions or agreements are published in the form of standards, technical reports or guidelines, and are recommended for international use and accepted by the National Committees in this sense.
4) In order to promote international unification, the IEC National Committees undertake to adopt the IEC International Standards as faithfully as possible in their national or regional standards. Any inconsistencies between IEC standards and corresponding national or regional standards should be clearly pointed out in the national or regional standards as much as possible.
This International Standard (IEC695-2-1/0) was prepared by IECTC89: Fire Hazard Testing Technical Committee. This International Standard meets the safety basis requirements of IEC104 Guide. This International Standard is based on the following documents: Draft International Standard
89 (Central Office)18
89 (Central Office)18A
Voting Report
89 (Central Office)28
Full information on voting for this standard can be found in the voting report indicated in the table above. IEC695-2-1 replaces the 1991 version of IEC695-2-1, Chapter 7 of the 1981 version of IEC707, and Chapter 6 of the 1988 version of IEC829.
IEC695-2-1 consists of the following chapters: IEC695-2-1/0: Fire hazard testing for electric and electronic products Part 2: Test methods Part 1/Chapter 0: Glow-wire test method general
IEC695-2-1/1: Fire hazard testing for electric and electronic products Part 2: Test methods Part 1/Chapter 1: Glow-wire test and guidance for finished products
IEC695-2-1/2: Fire hazard testing for electric and electronic products Part 2: Test methods Part 1/Chapter 2: Materials Glow-wire test for flammability
IEC695-2-1/3: Fire hazard test for electric and electronic products Part 2: Test methods Part 1/Chapter 3: Glow-wire test for ignitability of materials
GB/T5169.10-1997
The best way to test the fire hazard of electric and electronic products is to completely replicate the conditions that occur in reality, but in most cases, this is impossible. Therefore, the fire hazard test of electric and electronic products is best to simulate the effects that occur in reality as much as possible based on realistic conditions. Parts of electric and electronic equipment may be exposed to overheating stress due to electrical effects, and their degradation may reduce the safety performance of the equipment. These parts should not be excessively affected by the heat and fire generated inside the equipment. Parts of insulating materials or other solid combustible materials that are easy to spread flames inside the equipment may be ignited by glow-wires or glow-elements. Under certain conditions, such as fault current flowing through the wire, component overload, and poor contact, some components will reach a certain temperature and cause nearby parts to ignite. 496
1 Scope
National Standard of the People's Republic of China
Fire hazard testing for electric and electronic products
Test methods
Glow-wire test methods-General
Fire hazard testing for electric and electronic productsTest methods
Glow-wire test methods-GeneralGB/T5169.10—1997
idt IEC 695-2-1/0:1994
Replaces GB5169.485
The glow-wire test specified in this standard uses simulation technology to assess the ignition hazard of thermal stress caused by heat sources such as glowing components or overload resistors in a short period of time.
This standard applies to electric and electronic equipment and their components and parts, and also to solid electrical insulating materials or other solid combustible materials. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T5169.11997 Fire hazard testing for electric and electronic products Part 4: Fire test terminology (idtIEC695-4: 1993)
GB7676-87 Direct-acting analog indicating electrical measuring instruments and their accessories (eqvIEC51) ZBY300-85 Industrial thermocouple scales and tolerances (idtIEC584-1: 1977) ISO/IEC52 Guide: 1990 Compilation of terms and definitions on fire ISO4046: 1978 Paper, paperboard, pulp and related terms-vocabulary 3 Description of the test
This standard specifies the glow wire test using a non-flame ignition source. The glow wire is a standardized resistance wire loop, which is electrically heated to a specified temperature and then brought into contact with the test sample under test conditions.
For detailed requirements of each test, see GB/T5169.11 and the chapters of IEC695-2-1/2 and IEC695-2-1/3. This standard gives detailed descriptions of the test devices used in other chapters. 4 Description of the test device
The glow wire is made of a nickel/chromium (80/20) wire with a diameter of 4mm to form a ring of specified size; when the ring is formed, small cracks should be avoided at its top.
The temperature of the glow wire is measured using an armored fine-wire thermocouple with a nominal diameter of 0.5mm. The wire is made of nickel-chromium and nickel-aluminum (K type) wire, suitable for continuous operation at temperatures up to 960℃, and their welding points are located inside the armored sheath. Thermocouples used to measure glow-wire temperature, the metal of the armored sleeve must be able to withstand a temperature of at least 1050°C. Glow-wire with thermocouple is shown in Figure 1.
Minimum 70
GB/T 5169.10—1997
1—Glow wire brazed on 3, 2—Thermocouple—0. 5+.2
ZEnlarged view
Dimensions in mm,
-Note tight fit, 3---bolt
Figure 1 Position of glow wire and thermocouple
The thermocouple is placed in the hole drilled at the top of the glow wire, see enlarged view Z of Figure 1. Good thermal contact should be ensured between the top of the thermocouple and the bottom of the hole and around it, and ensure that the thermocouple moves along the top of the glow wire due to thermal expansion. Its thermoelectric potential should meet the requirements of ZBY300, and its characteristics are approximately linear. The cold end of the thermocouple should be kept in a melting ice-water mixture, unless other methods are used, such as using a compensation box to obtain a reliable reference temperature.
The instrument for measuring thermoelectric potential should be accurate to within 1% (for example, Class 0.5 of GB7676). The glow wire is heated by electricity, and the current required to reach 960℃ at its top temperature is between 120A and 150A. The test device is designed to keep the glow wire on a horizontal plane, and it applies a force of 0.8N to 1.2N to the test sample. This pressure value should be maintained during the relative movement of the glow wire or the test sample in the horizontal direction over a distance of at least 7mm. Typical examples of test devices are shown in Figures 2a and 2b. In order to evaluate the spread of fire, such as the spread of fire caused by burning or hot particles falling from the sample, a specified base layer is placed under the test sample.
If the relevant standard does not specify, the following base layer should be used: a layer of silk paper is tightly wrapped on a smooth white pine board with a thickness of about 10mm, and placed at (200±5)mm below the point where the glow wire is applied to the test sample. If experiments show that other materials have the same function as white pine boards or silk paper, they can also be used as substitutes. Note: According to Article 6.86 of IS04046, packaging silk paper is a soft and strong light packaging paper, with a gram weight per square meter generally between 12g/m2 and 30g/m2, and is mainly used as a protective packaging for sensitive instruments. The device is operated in a combustion box without air circulation and where the test sample can be observed. The size of the combustion box should ensure that the loss of oxygen during the test will not significantly affect the test results. The test sample is installed at least 100mm away from each surface of the combustion box. After each test, the air containing the decomposition products of the test sample should be safely discharged from the combustion box. 498
GB/T5169.10—1997
1-positioning block, 2-trolley; 3-tension rope, 4-bottom plate; 5. Weight block, 6 positioner: 7--flame height measuring ruler 8--penetration measuring ruler; 9--glowing wire (see Figure 1); 10~--the opening on the bottom plate is used for particles falling from the test sample Figure 2a
Example of test device
1--positioning block, 2--height adjustment bolt 3--tension rope; 4--bottom plate; 5-weight block: 6--bolt; 7--flame height measuring ruler 8-penetration adjustment; 9--glowing wire; 10---limit bolt, 11--resistance roller diagram 2b Example of test device
5 Severity level
GB/T5169.10-1997
The temperature of the top of the glow wire and the duration of its application on the test sample are specified in GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3.
6 Calibration and verification of the temperature measurement system
6.1 Calibration
The calibration temperature of the temperature measurement system is 960℃. The standard method is to place a square silver foil with a purity of 99.8%, a thickness of 0.06mm and a side length of 2mm on the upper surface of the top of the glow wire. When the glow wire is heated to melt the silver foil, the temperature is 960℃. 6.2 Verification
The accuracy of the temperature measurement system at the top of the glow wire must be verified regularly. If the steps in 6.1 are followed and the indication value of the temperature measurement system is within 5K of 960℃, the system is considered to be operating normally. If the indication value is outside this range, the temperature measurement system should be repaired or replaced. After each verification, the silver residue on the top of the glow wire must be removed, such as using a wire brush. 7 Pretreatment
Before the test begins, the white pine board and silk paper should be placed in an atmospheric environment with a temperature of 15℃~35℃ and a relative humidity of 45%~75% for 24h.
The pretreatment of the test sample shall be carried out in accordance with the provisions of GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 8 Initial test
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 9 Test procedure
Note:
When conducting the test, personal safety protection measures should be taken to prevent: the risk of combustion or explosion;
——inhalation of smoke and (or) toxic products, and toxic residues.
9.1 The fixation of the test sample should not dissipate heat significantly due to support or fastening. The installation of the test sample should ensure that:
——the contact surface with the top of the glow wire remains vertical;——the top of the glow wire is applied to the part of the test sample surface that may be subjected to the same thermal stress as in normal use. 9.2 Before the test, the tip of the glow-wire shall be cleaned of any residues of the material previously tested, for example by means of a wire brush. 9.3 The glow-wire is energized and heated to a specified temperature (see Clause 5) as measured by a calibrated thermocouple. Before the test begins, care shall be taken to ensure that this temperature and the heating current remain constant for at least 60 s and that the test specimen is not affected by the effects of thermal radiation by maintaining a certain distance or by using suitable shielding during the heating or calibration period. 9.4 The tip of the glow-wire is then brought into contact with the test specimen for a specified period (see Clause 5) during which the heating current shall be kept constant. Thereafter, the glow-wire and test specimen are slowly separated to avoid further heating of the test specimen and any air flow which could affect the test result. The depth to which the glow-wire is pressed into the test specimen shall be limited by mechanical means to 7 mm. If, as the glow-wire is removed, the glow-wire carries with it a large portion of the flaming material in the test specimen and the test specimen passes the test, this shall be recorded in the test report. GB/T5169.10—1997
9.5 The number of test samples shall be as specified in GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 10 Observation and measurement
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 11 Evaluation of test results
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 12 Provisions that should be given when relevant standards adopt this test method The provisions that should be given when relevant standards adopt this test method include: the number of test samples;
- pretreatment and initial inspection of test samples, - the base layer used;
test surface and application point;
severity level;
observation and measurement,
evaluation criteria.
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 501A force of 2 N is applied and this pressure value shall be maintained during the relative movement of the glow wire or the test sample in the horizontal direction over a distance of at least 7 mm. Typical examples of test apparatus are shown in Figures 2a and 2b. In order to assess the spread of fire, such as the spread of fire caused by burning or glowing particles falling from the sample, a specified base layer is placed under the test sample.
If the relevant standard does not specify, the following base layer shall be used: a layer of silk paper is tightly wrapped on a smooth white pine board about 10 mm thick and placed (200 ± 5) mm below the point where the glow wire is applied to the test sample. If other materials are proven to have the same function as white pine boards or silk paper, they may be used as substitutes. Note: According to Article 6.86 of IS04046, packaging silk paper is a soft, strong and lightweight packaging paper with a grammage per square meter generally between 12g/m2 and 30g/m2, mainly used as protective packaging for sensitive instruments. The device is operated in a combustion box without air circulation and in which the test sample can be observed. The size of the combustion box should ensure that the loss of oxygen during the test will not significantly affect the test results. The test sample is installed at least 100mm away from each surface of the combustion box. After each test, the air containing the decomposition products of the test sample should be safely discharged from the combustion box. 498
GB/T5169.10—1997
1-positioning block, 2-trolley; 3-tension rope, 4-bottom plate; 5. Weight block, 6 positioner: 7--flame height measuring ruler 8--penetration measuring ruler; 9--glowing wire (see Figure 1); 10~--the opening on the bottom plate is used for particles falling from the test sample Figure 2a
Example of test device
1--positioning block, 2--height adjustment bolt 3--tension rope; 4--bottom plate; 5-weight block: 6--bolt; 7--flame height measuring ruler 8-penetration adjustment; 9--glowing wire; 10---limit bolt, 11--resistance roller diagram 2b Example of test device
5 Severity level
GB/T5169.10-1997
The temperature of the top of the glow wire and the duration of its application on the test sample are specified in GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3.
6 Calibration and verification of the temperature measurement system
6.1 Calibration
The calibration temperature of the temperature measurement system is 960℃. The standard method is to place a square silver foil with a purity of 99.8%, a thickness of 0.06mm and a side length of 2mm on the upper surface of the top of the glow wire. When the glow wire is heated to melt the silver foil, the temperature is 960℃. 6.2 Verification
The accuracy of the temperature measurement system at the top of the glow wire must be verified regularly. If the steps in 6.1 are followed and the indication value of the temperature measurement system is within 5K of 960℃, the system is considered to be operating normally. If the indication value is outside this range, the temperature measurement system should be repaired or replaced. After each verification, the silver residue on the top of the glow wire must be removed, such as using a wire brush. 7 Pretreatment
Before the test begins, the white pine board and silk paper should be placed in an atmospheric environment with a temperature of 15℃~35℃ and a relative humidity of 45%~75% for 24h.
The pretreatment of the test sample shall be carried out in accordance with the provisions of GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 8 Initial test
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 9 Test procedure
Note:
When conducting the test, personal safety protection measures should be taken to prevent: the risk of combustion or explosion;
——inhalation of smoke and (or) toxic products, and toxic residues.
9.1 The fixation of the test sample should not dissipate heat significantly due to support or fastening. The installation of the test sample should ensure that:
——the contact surface with the top of the glow wire remains vertical;——the top of the glow wire is applied to the part of the test sample surface that may be subjected to the same thermal stress as in normal use. 9.2 Before the test, the tip of the glow-wire shall be cleaned of any residues of the material previously tested, for example by means of a wire brush. 9.3 The glow-wire is energized and heated to a specified temperature (see Clause 5) as measured by a calibrated thermocouple. Before the test begins, care shall be taken to ensure that this temperature and the heating current remain constant for at least 60 s and that the test specimen is not affected by the effects of thermal radiation by maintaining a certain distance or by using suitable shielding during the heating or calibration period. 9.4 The tip of the glow-wire is then brought into contact with the test specimen for a specified period (see Clause 5) during which the heating current shall be kept constant. Thereafter, the glow-wire and test specimen are slowly separated to avoid further heating of the test specimen and any air flow which could affect the test result. The depth to which the glow-wire is pressed into the test specimen shall be limited by mechanical means to 7 mm. If, as the glow-wire is removed, the glow-wire carries with it a large portion of the flaming material in the test specimen and the test specimen passes the test, this shall be recorded in the test report. GB/T5169.10—1997
9.5 The number of test samples shall be as specified in GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 10 Observation and measurement
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 11 Evaluation of test results
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 12 Provisions that should be given when relevant standards adopt this test method The provisions that should be given when relevant standards adopt this test method include: the number of test samples;
- pretreatment and initial inspection of test samples, - the base layer used;
test surface and application point;
severity level;
observation and measurement,
evaluation criteria.
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 501A force of 2 N is applied and this pressure value shall be maintained during the relative movement of the glow wire or the test sample in the horizontal direction over a distance of at least 7 mm. Typical examples of test apparatus are shown in Figures 2a and 2b. In order to assess the spread of fire, such as the spread of fire caused by burning or glowing particles falling from the sample, a specified base layer is placed under the test sample.
If the relevant standard does not specify, the following base layer shall be used: a layer of silk paper is tightly wrapped on a smooth white pine board about 10 mm thick and placed (200 ± 5) mm below the point where the glow wire is applied to the test sample. If other materials are proven to have the same function as white pine boards or silk paper, they may be used as substitutes. Note: According to Article 6.86 of IS04046, packaging silk paper is a soft, strong and lightweight packaging paper with a grammage per square meter generally between 12g/m2 and 30g/m2, mainly used as protective packaging for sensitive instruments. The device is operated in a combustion box without air circulation and in which the test sample can be observed. The size of the combustion box should ensure that the loss of oxygen during the test will not significantly affect the test results. The test sample is installed at least 100mm away from each surface of the combustion box. After each test, the air containing the decomposition products of the test sample should be safely discharged from the combustion box. 498
GB/T5169.10—1997
1-positioning block, 2-trolley; 3-tension rope, 4-bottom plate; 5. Weight block, 6 positioner: 7--flame height measuring ruler 8--penetration measuring ruler; 9--glowing wire (see Figure 1); 10~--the opening on the bottom plate is used for particles falling from the test sample Figure 2a
Example of test device
1--positioning block, 2--height adjustment bolt 3--tension rope; 4--bottom plate; 5-weight block: 6--bolt; 7--flame height measuring ruler 8-penetration adjustment; 9--glowing wire; 10---limit bolt, 11--resistance roller diagram 2b Example of test device
5 Severity level
GB/T5169.10-1997
The temperature of the top of the glow wire and the duration of its application on the test sample are specified in GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3.
6 Calibration and verification of the temperature measurement system
6.1 Calibration
The calibration temperature of the temperature measurement system is 960℃. The standard method is to place a square silver foil with a purity of 99.8%, a thickness of 0.06mm and a side length of 2mm on the upper surface of the top of the glow wire. When the glow wire is heated to melt the silver foil, the temperature is 960℃. 6.2 Verification
The accuracy of the temperature measurement system at the top of the glow wire must be verified regularly. If the steps in 6.1 are followed and the indication value of the temperature measurement system is within 5K of 960℃, the system is considered to be operating normally. If the indication value is outside this range, the temperature measurement system should be repaired or replaced. After each verification, the silver residue on the top of the glow wire must be removed, such as using a wire brush. 7 Pretreatment
Before the test begins, the white pine board and silk paper should be placed in an atmospheric environment with a temperature of 15℃~35℃ and a relative humidity of 45%~75% for 24h.
The pretreatment of the test sample shall be carried out in accordance with the provisions of GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 8 Initial test
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 9 Test procedure
Note:
When conducting the test, personal safety protection measures should be taken to prevent: the risk of combustion or explosion;
——inhalation of smoke and (or) toxic products, and toxic residues.
9.1 The fixation of the test sample should not dissipate heat significantly due to support or fastening. The installation of the test sample should ensure that:
——the contact surface with the top of the glow wire remains vertical;——the top of the glow wire is applied to the part of the test sample surface that may be subjected to the same thermal stress as in normal use. 9.2 Before the test, the tip of the glow-wire shall be cleaned of any residues of the material previously tested, for example by means of a wire brush. 9.3 The glow-wire is energized and heated to a specified temperature (see Clause 5) as measured by a calibrated thermocouple. Before the test begins, care shall be taken to ensure that this temperature and the heating current remain constant for at least 60 s and that the test specimen is not affected by the effects of thermal radiation by maintaining a certain distance or by using suitable shielding during the heating or calibration period. 9.4 The tip of the glow-wire is then brought into contact with the test specimen for a specified period (see Clause 5) during which the heating current shall be kept constant. Thereafter, the glow-wire and test specimen are slowly separated to avoid further heating of the test specimen and any air flow which could affect the test result. The depth to which the glow-wire is pressed into the test specimen shall be limited by mechanical means to 7 mm. If, as the glow-wire is removed, the glow-wire carries with it a large portion of the flaming material in the test specimen and the test specimen passes the test, this shall be recorded in the test report. GB/T5169.10—1997
9.5 The number of test samples shall be as specified in GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 10 Observation and measurement
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 11 Evaluation of test results
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 12 Provisions that should be given when relevant standards adopt this test method The provisions that should be given when relevant standards adopt this test method include: the number of test samples;
- pretreatment and initial inspection of test samples, - the base layer used;
test surface and application point;
severity level;
observation and measurement,
evaluation criteria.
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 50111. IEC695-2-1/2 and IEC695-2-1/3. 9 Test procedure
Notes:
When conducting the test, personal safety protection measures should be taken to prevent: the risk of combustion or explosion;
- Inhalation of smoke and (or) toxic products, - toxic residues.
9.1 The fixation of the test sample should not dissipate heat significantly due to support or fastening. The installation of the test sample should ensure:
- The contact surface with the top of the glow wire remains vertical; - The top of the glow wire is applied to the part of the test sample surface that may be subjected to the same thermal stress as in normal use. 9.2 Before the test, the residues of the previous test material on the top of the glow wire must be removed, for example using a wire brush. 9.3 The glow-wire is energized and heated to a specified temperature (see Clause 5) which is measured by a calibrated thermocouple. Before the test is started, care shall be taken to ensure that this temperature and the heating current remain constant for at least 60 s and that the test specimen is not affected by thermal radiation by maintaining a certain distance or using appropriate shielding during the heating or calibration period. 9.4 The top of the glow-wire is then brought into contact with the test specimen for a specified period (see Clause 5) during which the heating current shall be kept constant. Thereafter, the glow-wire and test specimen are slowly separated to avoid further heating of the test specimen and any air flow that could affect the test result. The depth to which the glow-wire is pressed into the test specimen shall be limited by mechanical means to 7 mm. If, as the glow-wire is removed, the glow-wire carries with it most of the flaming material in the test specimen and the test specimen passes the test, this shall be recorded in the test report. GB/T5169.10—1997
9.5 The number of test samples shall be as specified in GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 10 Observation and measurement
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 11 Evaluation of test results
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 12 Provisions that should be given when relevant standards adopt this test method The provisions that should be given when relevant standards adopt this test method include: the number of test samples;
- pretreatment and initial inspection of test samples, - the base layer used;
test surface and application point;
severity level;
observation and measurement,
evaluation criteria.
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 50111. IEC695-2-1/2 and IEC695-2-1/3. 9 Test procedure
Notes:
When conducting the test, personal safety protection measures should be taken to prevent: the risk of combustion or explosion;
- Inhalation of smoke and (or) toxic products, - toxic residues.
9.1 The fixation of the test sample should not dissipate heat significantly due to support or fastening. The installation of the test sample should ensure: bZxz.net
- The contact surface with the top of the glow wire remains vertical; - The top of the glow wire is applied to the part of the test sample surface that may be subjected to the same thermal stress as in normal use. 9.2 Before the test, the residues of the previous test material on the top of the glow wire must be removed, for example using a wire brush. 9.3 The glow-wire is energized and heated to a specified temperature (see Clause 5) which is measured by a calibrated thermocouple. Before the test is started, care shall be taken to ensure that this temperature and the heating current remain constant for at least 60 s and that the test specimen is not affected by thermal radiation by maintaining a certain distance or using appropriate shielding during the heating or calibration period. 9.4 The top of the glow-wire is then brought into contact with the test specimen for a specified period (see Clause 5) during which the heating current shall be kept constant. Thereafter, the glow-wire and test specimen are slowly separated to avoid further heating of the test specimen and any air flow that could affect the test result. The depth to which the glow-wire is pressed into the test specimen shall be limited by mechanical means to 7 mm. If, as the glow-wire is removed, the glow-wire carries with it most of the flaming material in the test specimen and the test specimen passes the test, this shall be recorded in the test report. GB/T5169.10—1997
9.5 The number of test samples shall be as specified in GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 10 Observation and measurement
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 11 Evaluation of test results
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 12 Provisions that should be given when relevant standards adopt this test method The provisions that should be given when relevant standards adopt this test method include: the number of test samples;
- pretreatment and initial inspection of test samples, - the base layer used;
test surface and application point;
severity level;
observation and measurement,
evaluation criteria.
For detailed provisions, please refer to GB/T5169.11, IEC695-2-1/2 and IEC695-2-1/3. 501
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