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GB/T 5169.16-2017 (GB/T5169.16-2017)

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GB/T 5169.16-2017: PDF in English (GBT 5169.16-2017)

GB/T 5169.16-2017
Fire hazard testing for electric and electronic products--Part 16. Test flames--50 W horizontal and vertical flame test methods
ICS 13.220.40; 29.020
National Standards of People's Republic of China
Replace GB/T 5169.16-2008
Electrical and electronic products fire hazard test
Part 16. Test flame
50W horizontal and vertical flame test method
Part 16. Testflames-50Whorizontalandverticalflametestmethods
(IEC 60695-11-10.2013, Firehazardtesting-Part 11-10. Testflames-
50Whorizontalandverticalflametestmethods, IDT)
2017-12-29 released.2018-07-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Foreword I
Introduction III
1 range 1
2 Normative references 1
3 Terms and Definitions 2
4 Principle 5
5 The significance of the fire test 5
6 test device 6
7 sample 7
8 Test Method A - Horizontal Burning Test 8
9 Test Method B - Vertical Burning Test 11
Appendix A (informative) Accuracy of Test Method A 23
Appendix B (informative) Accuracy of Test Method B 24
Reference 25
Figure 1 Horizontal combustion test device 14
Figure 2 Supporting fixture for flexible specimens - Method A 15
Figure 3 Vertical Burning Test Device - Method B 16
Figure 4 Strip sample 17
Figure 5 Optional gauge gauge 17
Figure 6 Gap gauge 18
Figure 7 Application of flame 19
Figure 8 Application of flame with molten drops 19
Figure 9 HB sample gauge (example) 20
Figure 10 V sample gauge (example) 20
Figure 11 Flame front position 21 not "burned to the clamp"
Figure 12 Flame front position 22 "burn to clamp"
Table 1 Tolerance of nominal thickness 7
Table 2 Judging criteria for vertical burning classification 13
Table A.1 Linear Burning Rate 23
Table B.1 Afterflame time and afterflame plus afterburning time 24
GB/T 5169 "Electrical and Electronic Products Fire Hazard Test" consists of the following parts.
--- Part 1. Terminology for ignition test;
--- Part 2. General guidelines for the assessment of fire hazard;
---Part 5. Test flame test method, test method and guide;
--- Part 9. General rules for pre-selection test procedures for fire hazard assessment guidelines;
--- Part 10. Glow wire/hot wire basic test method Glow wire device and general test method;
--- Part 11. Glow wire/hot wire basic test method Glow wire flammability test method (GWEPT);
--- Part 12. Glow wire/hot wire basic test method Glow wire flammability index (GWFI) test method;
--- Part 13. Glow wire/hot wire basic test method Glow wire light-off temperature (GWIT) test method for materials;
---Part 14. Test flame 1kW nominal premixed flame device, validation test method and guidelines;
---Part 15. Test flame 500W flame device and confirmation test method;
--- Part 16. Test flame 50W horizontal and vertical flame test method;
---Part 17. Test flame 500W flame test method;
---Part 18. General principles of toxicity of combustion streams;
---Part 19. Unnormal thermal compression stress release deformation test;
--- Part 20. Summary and correlation of test methods for flame surface spread;
--- Part 21. Unusual hot ball pressure test method;
--- Part 22. Test flame 50W flame device and confirmation test method;
--- Part 23. Test flame tube-shaped polymeric material 500W vertical flame test method;
--- Part 24. Fire hazard assessment guidelines for insulating liquids;
--- Part 25. General rules for smoke blur;
--- Part 26. Summary and correlation of smoke fuzzing test methods;
--- Part 27. Smoke fuzzy small-scale static test method instrument description;
--- Part 28. Smoke fuzzy small-scale static test method materials;
---Part 29. General rules for heat release;
--- Part 30. Summary and correlation of heat release test methods;
--- Part 31. General rules for the spread of flame surfaces;
--- Part 32. Heat release of heat release insulating liquids;
--- Part 33. Fire hazard assessment guidelines for general ignitability;
--- Part 34. Fire hazard assessment guidelines Summary and correlation of ignitability test methods;
--- Part 35. General rules for corrosion hazards of combustion streams;
--- Part 36. Summary and correlation of test methods for corrosion hazards of combustion flows;
--- Part 38. Summary and correlation of toxicity test methods for combustion streams;
--- Part 39. Use and description of the toxicity test results of the combustion stream;
--- Part 40. Toxic toxicological assessment devices and test methods for combustion streams;
--- Part 41. Calculation and description of test results for toxic toxicity assessment of combustion streams;
--- Part 42. Test flame confirmation test guidelines;
--- Part 44. Fire hazard assessment guidelines for fire hazard assessment.
This part is the 16th part of GB/T 5169.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 5169.16-2008 "Electrical and electronic products - Fire hazard test - Part 16. Test flame 50W water
The main technical changes compared with GB/T 5169.16-2008 are as follows.
---Modified the chapter on normative references (see Chapter 2, Chapter 2 of the.2008 edition);
--- Modified some of the terms and definitions (see Chapter 3, Chapter 3 of the.2008 edition);
--- Revised the layout of the "sample" "Method A" and "Method B" chapters to make the organization clearer (see Chapters 7, 8 and 9).
Chapters 7, 8, and 9 of the.2008 edition);
--- Added the criteria for the evaluation of "burn to clamp fixtures" (see 9.2.4);
--- Removed the "burner/operator/test sample orientation" map (2008 Figure 6);
--- Added "gauge gauge" "application of flame" "application of flame when there is molten drip" "HB sample gauge (example)" "V specimen
Gauge (example) ""flame leading edge position not burned to the gripping fixture"" "burning to the flame front position of the gripping fixture" 7 diagrams
(See Figures 6, 7, 8, 9, 9, 10, and 12).
This section uses the translation method equivalent to IEC 60695-11-10.2013 "Fire hazard test Part 11-10. Test flame
50W horizontal and vertical flame test method.
The documents of our country that have a consistent correspondence with the international documents referenced in this part are as follows.
--- GB/T 5169.1-2015 Electrical and electronic products - Fire hazard testing - Part 1 . Fire test term (IEC 60695-4.
2012, IDT)
--- GB/T 5169.22-2015 Electrical and electronic products - Fire hazard test - Part 22. Test flame 50W
Set and confirm test methods (IEC 60695-11-4.2011, IDT)
---GB/T 5471-2008 Compression molding of plastic thermosetting plastic samples (ISO 295.2004, IDT)
---GB/T 9352-2008 Compression molding of plastic thermoplastic materials (ISO 293.2004, IDT)
--- GB/T 12006.1-2009 Plastic polyamide - Part 1. Determination of viscosity (ISO 307.2007, IDT)
---GB/T 16499-2008 Preparation of safety publications and application of basic safety publications and multi-disciplinary shared safety publications
Guidelines (neq IEC guide 104..1997)
---GB/T 20002.4-2015 Standardization Work Guide Part 4. Contents related to safety in the standard (ISO /IEC guide
51.2014, MOD)
This section has made the following editorial changes.
--- In line with the existing standard series, change the standard name to "Electrical and Electronic Products Fire Hazard Test Part 16. Test Fire
Flame 50W Horizontal and Vertical Flame Test Method.
This part was proposed by China Electrical Equipment Industry Association.
This part is under the jurisdiction of the National Standardization Technical Committee for Fire and Hazard Testing of Electrical and Electronic Products (SAC/TC300).
This section is responsible for drafting unit. China Electric Apparatus Research Institute Co., Ltd.
Participated in the drafting of this section. Guangdong Yuanrong New Materials Co., Ltd., Dongguan Entry-Exit Inspection and Quarantine Bureau Inspection and Quarantine Comprehensive Technology Center,
Beijing Tairuite Testing Technology Service Co., Ltd., Guangdong Entry-Exit Inspection and Quarantine Bureau Inspection and Quarantine Technology Center, Wenzhou Yaohua Telecommunications Co., Ltd.
Company, Weikai Testing Technology Co., Ltd., Zhongjiayuan (Beijing) Testing and Certification Co., Ltd., China Electronics Technology Standardization Research Institute, Shenzhen City
Quantity Quality Inspection Institute, Wuxi Sunan Test Equipment Co., Ltd., Zhuhai Gree Electric Co., Ltd., Ministry of Industry and Information Technology
Five Research Institutes, Shandong Provincial Product Quality Inspection Institute.
The main drafters of this section. Wu Qian, Chen Xin, Zheng Shaofeng, Gao Lingsong, Wu Zheng, Huang Kaiyun, Wang Sheng, Liu Yan, Wan Cheng, Li Yuxi, Wang Tong,
Ni Yunan, Chen Xiaoli, Zhang Yuanqin, Liu Ya.
The previous versions of the standards replaced by this section are.
---GB/T 5169.16-2002, GB/T 5169.16-2008.
All electrical and electronic products must be designed with fire risk and potential fire hazard in mind. Design of components, circuits and products, and
The purpose of the screening of materials is to understand potential fires under normal operating conditions and in the case of reasonably foreseeable abnormal use, failure and failure.
The risk is reduced to an acceptable level. How to achieve IEC 60695-1-10 and IEC 60695-1-11 developed by IEC /TC89
This purpose provides guidance.
The primary purpose of IEC 60695-1-10 and IEC 60695-1-11 is to provide guidance for the following actions.
a) prevent the ignition of live parts;
b) If ignition occurs, the fire is confined to the electrical and electronic product enclosure.
The secondary purpose is to minimize the extent to which the flame spreads outside the product, as well as to the combustion stream such as heat, smoke, toxicity and/or corrosive
Harmful effects are minimized.
Fires involving electrical and electronic products may also be caused by non-electric external sources of ignition. This factor should be considered in the overall risk assessment.
This section describes the small-scale test methods performed on materials used in electrical equipment. The 50W test flame is used as the ignition source. This section
The specified classification method can be used for quality assurance, pre-selection of product parts and materials, or to verify the minimum level of combustion required for the materials used in the finished product.
This test method cannot be used alone to describe or assess the risk of fire or fire of materials, products or components under actual fire conditions.
However, the results of this test can be used as an element of a fire risk assessment that takes into account all factors, the fire risk assessment and a specific end use
The risk assessment of the way is related.
This section may involve hazardous materials, operations, and equipment. Its purpose is not to solve all the security issues related to it.
question. Before using this section, users of this section should establish appropriate safety and health measures and determine their applicability and limitations.
Electrical and electronic products fire hazard test
Part 16. Test flame
50W horizontal and vertical flame test method
1 Scope
This part of GB/T 5169 specifies small-scale laboratory tests for comparing the combustion properties of different materials used in electrical and electronic products.
Procedure, in which the strip sample is placed horizontally or vertically and exposed to a small flame with a nominal power of 50 W. Test method
Used to determine the linear burning rate or self-extinguishing property of the material.
The test methods in this section are applicable to solid materials and foams having an apparent density of not less than 250 kg/m3 as determined by the method of ISO 845.
This section gives two test methods. Method A is a horizontal burning test designed to measure the linear combustion of materials under specified test conditions.
rate. Method B is a vertical burning test designed to measure the self-extinguishing ability of materials under specified test conditions.
Note 1. ISO 9772 describes a test method for measuring the combustion characteristics of materials for materials with an apparent density of less than or equal to 250 kg/m3.
ISO 9773 describes a test method for measuring the burning properties of materials, which is suitable for use in the use of method B of this part, because thin will produce distortion and /
Or the material that burns to the fixture.
The classification methods specified in the test methods described in this section (see 8.4 and 9.4) can be used for quality assurance, pre-selection of product constituent materials, or
Verify the minimum level of combustion required for the material used in the finished product.
Note 2. The pre-selection guide can be found in IEC 60695-1-30.
This section is intended to prepare standards for the Product Standards Committee in accordance with the principles set forth in IEC Guide 104 and ISO /IEC Guide 51.
One of the tasks of the Product Standards Committee is to use this series of standards wherever applicable. Unless relevant
Special mention or list, otherwise the requirements, test methods or test conditions of this section will not apply.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
ISO 291.2008 Standard environment for conditioning and testing of plastic specimens (Plastics-Standardatmospheresforcon-
Compression molding of ISO 293 plastic thermoplastic specimens (Plastics-Compressionmouldingoftestspecimensof
Catalyst materials)
ISO 294 (all parts) Injection molding of plastic thermoplastic specimens (Plastics-Injectionmouldingoftestspeci-
Compression molding of ISO 295 plastic thermosetting plastic samples (Plastics-Compressionmouldingoftestspecimensof
ISO 307 Plastics-Polyamides-Determination of Viscositynumber
ISO 9773 Determination of the burning characteristics of flexible vertical specimens when exposed to small flame ignition sources (Plastics-Determi-
ISO 13943.2008 Fire Safety Typo (FireSafety-Vocabulary)
Determination of the linear dimensions of ISO 16012 plastic test samples (Plastics-Determination oflineardimensionsof
IEC 60695-4 Fire hazard testing - Part 4. Terms relating to ignition tests of electric and electronic products (Firehazardtes-
ting-Part 4.Terminologyconcerningfiretestsforelectrotechnicalproducts)
IEC 60695-11-4 Fire hazard testing - Part 11-4. Test flame 50W flame apparatus and test method (Fire
hazardtesting-Part 11-4. Testflames-50Wflames-Apparatusandconfirmationaltestmethod)
IEC Guide 104 Preparation of safety publications and application guidelines for basic safety publications and multi-disciplinary shared safety publications (The
ISO /IEC Guide 51 Guidelines for safety aspects in safety aspects (Safetyaspects-Guidelinesfortheir
3 Terms and definitions
The following terms and definitions defined by ISO 13943.2008 and IEC 60695-4 apply to this document, for ease of use, the following
Some terms and definitions in ISO 13943.2008 and IEC 60695-4 are listed.
Afterflame afterflame
Under the specified test conditions, the material continues to flaming after removal of the ignition source.
[ISO 13943.2008, definition 4.6]
Afterflame time afterflametime
The period of time during which the residual flame lasts under the test conditions.
Note. This method is specified in method B as t1 and t2.
[ISO 13943.2008, definition 4.7]
Afterburning afterglow
After the ignition source is removed and the flame is terminated, the material continues to burn.
[ISO 13943.2008, definition 4.8]
Afterburning time afterglowtime
Under the test conditions, the period of time after the burn is continued.
Note. This method is specified in method B as t3.
[ISO 13943.2008, definition 4.9]
"Standard status" "asreceived"
The sample was pretreated under laboratory conditions for a period of time.
Burning (intransitiveverb) burn(intransitiveverb)
Withstand burning.
[ISO 13943.2008, definition 4.28]
Combustion performance burningbehaviour
< Fire test> The sample is placed under specified combustion conditions to test its response to fire or fire.
[ISO 13943.2008, definition 4.32]
Combustion combustion
An exothermic reaction of a substance with an oxidant.
Note. Combustion usually produces a combustion stream accompanied by a flame and/or heat.
[ISO 13943.2008, definition 4.46]
No ventilation environment draught-freeenvironment
The test results are not affected by the spatial environment in which the local airflow is significantly affected.
Note. Qualitative examples, such as. a space environment that keeps the candle flame substantially stable. Quantitative examples, such as. small-scale ignition tests, sometimes the largest specified
The air flow rate is 0.1 m/s or 0.2 m/s.
[ISO 13943.2008, definition 4.70]
Shell enclosure
< Electrical and Electronic Engineering> Covers for electrical and mechanical parts of protective equipment.
Note. Except for cables.
[ISO 13943.2008, definition 4.78]
Fire danger firehazard
An undesired potential substance or condition caused by a fire.
[ISO 13943.2008, definition 4.112]
Fire hazard assessment firehazardassessment
Assessment of the cause of the fire, the likelihood and type of subsequent fire development, and the likely consequences of the fire.
[IEC 60695-4, definition 3.2.10]
Flame retardant fireretardant
In order to inhibit, reduce or delay the burning of materials, a substance is added to the material or a treatment is applied to the material.
Note. Flame retardant does not necessarily inhibit ignition or terminate combustion.
[ISO 13943.2008, definition 4.123]
Fire risk firerisk
The possibility of quantifying the measurement with the consequences of the fire.
Note. It is usually evaluated by the product of the probability of occurrence of fire and the consequences of fire.
[ISO 13943.2008, definition 4.124]
Fire test firetest
Tests that measure fire performance or exposure to fires.
Note. The results of the ignition test can be used to quantify the severity of a sample's ignition or to determine its fire resistance or ignition response.
[ISO 13943.2008, definition 4.132]
Burning (verb) flame(verb)
Produce a flame.
[ISO 13943.2008, definition 4.134]
Flame (noun) flame(noun)
In a gaseous medium, rapid, spontaneous, and subsonic propagating combustion is usually accompanied by luminescence.
[ISO 13943.2008, definition 4.133]
Flame frontal flamefront
A boundary of a flaming combustion zone that propagates on the surface of the material or via a gas mixture.
[ISO 13943.2008, definition 4.136]
Flame spread flamespread
The spread of the flame front.
[ISO 13943.2008, definition 4.142]
Under the specified conditions, the material or product is accompanied by the ability to burn flames.
[ISO 13943.2008, definition 4.151]
Ignition ignition
Long-lasting light-off (not recommended)
< Normal> The beginning of burning.
[ISO 13943.2008, definition 4.187]
Ignition ignition
Long-lasting light-off (not recommended)
< flame burning> continues the beginning of the flame.
[ISO 13943.2008, definition 4.188]
Linear burning rate linearburningrate
Burning rate (not recommended)
Proportion of burning (not recommended)
The length of material burning per unit time under specified conditions.
Note 1. The representative unit is meters per second (m/s).
Note 2. The unit used in this section is millimeters per minute (mm/min).
[ISO 13943.2008, definition 4.214]
Melt dripping (noun) moltendrip(noun)
A droplet of material that has dripped due to heat being softened or liquefied.
Note. The droplets can be flaming or flameless.
[ISO 13943.2008, definition 4.232]
Self-extinguish (verb) self-extinguish (verb)
Self-extinguishing (not recommended)
Stop burning without external influence.
[ISO 13943.2008, definition 4.284]
4 Principle
Hold one end of the rectangular strip specimen in a horizontal or vertical state with the free end in contact with the specified test flame. By measuring level
The supported strip samples were evaluated for their burning performance at a linear burning rate under specified test conditions. By measuring the strip of vertical support at
Specify the afterflame and afterburning time under the test conditions (observing whether the material self-extinguishes), the burning degree of the burning particles and the dripping condition to evaluate the burning
5 The significance of the fire test
5.1 Vertical and horizontal tests
The ignition test of materials under the conditions specified in this section, comparing the relative combustion characteristics of different materials, controlling the manufacturing process or
There is considerable significance in assessing changes in combustion characteristics. The test results obtained by these ignition test methods depend on the shape and take of the sample.
Direction, and the environment around the sample and the ignition.
A striking feature of these ignition test methods is that the sample is placed in a horizontal or vertical position. It can be divided into flammable materials
Sex level.
Note 1. The test results obtained by the horizontal combustion (HB) method are not equivalent to the test results obtained by the vertical combustion (V) method.
Note 2. Test results obtained by these methods (HB and V) and test results obtained by the 5VA and 5VB combustion tests specified in IEC 60695-11-20
It is not equivalent because the thermal power of the test flame in this method is 50W, while the thermal power of the test flame in IEC 60695-11-20 is 500W.
5.2 Limitation of use of test results
The results obtained in accordance with this section should not be used alone to describe or assess the fire hazard of a particular material under actual fire conditions. Measured
Fire hazard needs to consider fuel action, combustion intensity (heat release rate), combustion products and environmental factors, including the nature of the ignition source, the exposed material
Orientation and ventilation conditions.
5.3 Physical properties that can affect combustion characteristics
The combustion characteristics measured by this test method are affected by factors such as the density of the material, the anisotropy, and the thickness of the sample.
5.4 Contracture and deformation
Some samples may shrink or deform in a fire without burning, in which case it is necessary to replenish samples of the same thickness to obtain effective
test results. If the thickness still does not yield valid test results, the specified thickness of the material should not be used in this test method.
Note. For flexible specimens that are flexible and have more than one specimen that is not ignited by fire, ISO 9773 provides a test for determining the flammability rating.
5.5 Effect of sample state adjustment
The burning characteristics of certain plastics may vary over time. Therefore, it is recommended to test before and after the appropriate state adjustment method. Preferred
The state adjustment method was performed in an oven at 70 ° C ± 2 ° C for 168 h ± 2 h. It can also be adjusted according to the relevant agreement.
Interval and temperature, but should be noted in the test report.
6 test device
6.1 Laboratory fume hood/test chamber
The volume of the laboratory fume hood/test chamber should be at least 0.5 m3. The test chamber shall allow observation of the progress of the test and shall be without a ventilation ring
Environment that allows for normal thermal cycling of air around the sample during combustion. The inner surface of the test chamber should be dark. Apply an illuminometer to the test
When the rear of the box is placed at the position of the specimen, the displayed illuminance should be less than 20lx. For safety and convenience, the test chamber (which can be completely sealed) should be installed.
There are exhaust devices, such as exhaust fans, to expel potentially toxic combustion products. If an exhaust is installed, it should be closed during the test.
The device was opened immediately after the test to expel the combustion stream. At this point, you may need a damper that is forced to close.
Note. A mirror can be placed in the test chamber to observe the other side of the specimen.
6.2 Laboratory Burner
Laboratory burners shall be confirmed in accordance with IEC 60695-11-4.
6.3 bracket
The bracket should have a clamp or similar device that adjusts the position of the specimen (see Figures 1 and 3).
6.4 timing device
The timing of the timing device should be at least 0.5s.
Note. Some labs have found it effective to use a sound activation timer as a means of calculating the flame application time.
6.5 measuring ruler
The scale of the gauge should be in millimeters (mm).
6.6 Wire mesh
The wire mesh should be 20 mesh (ie about 20 holes per 25mm), made of steel wire with a diameter of 0.40mm~0.45mm, and then
Cut into a square of about 125 mm x 125 mm.
6.7 Condition adjustment box
The condition adjustment box should maintain a temperature of 23 ° C ± 2 ° C, relative humidity of 50% ± 10%.
Note. Atmospheric environmental standards for plastic materials during conditioning and testing are described in ISO 291.2008.
6.8 micrometer
The micrometer should meet.
a) When the sample thickness is ≥ 0.25mm, the resolution is ≤ 0.01mm;
b) When the sample thickness is < 0.25mm, the resolution is ≤0.001mm.
6.9 HB support fixture
The HB support fixture is used to detect non-self-supporting specimens (see Figure 2).
6.10 Drying box
The drying oven should be filled with anhydrous calcium chloride or other desiccant to maintain the temperature at 23 °C ± 2 °C and the relative humidity not exceeding 20%.
6.11 Air circulation oven
The air circulation oven shall be capable of providing a temperature environment of 70 ° C ± 2 ° C, unless otherwise stated in the relevant specifications, the air exchange per hour shall be not less than
5 times.
6.12 cotton pad
Cotton pads should be made of absorbent cotton designated "100% cotton" or "pure cotton".
Note. This can also be "raw cotton".
7 sample
7.1 Preparation of samples
Specimens shall be prepared by appropriate ISO methods such as ISO 294 casting and injection molding, ISO 293 or ISO 295 compression molding or compression molding.
Make the shape you want. If this is not possible, the specimen should be made using the same manufacturing process as the molded part; if not,
Samples can be cut from representative molded parts of the finished product.
Note. If the sample cannot be prepared by the above method, consider using other alternative flame test methods (eg IEC 60695-11-5 needle flame method).
For any cutting process, all dust and particles on the surface should be carefully removed after finishing; and the edges of the slits should be smoothed with fine sandpaper.
7.2 Size of the sample
The dimensions of the strip specimen are. length 125mm ± 5mm, width 13.0mm ± 0.5mm, and at least the minimum sum should be provided in consideration of combustion classification.
Maximum thickness (see Figure 4). Preferred thickness values include 0.1mm, 0.2mm, 0.4mm, 0.75mm, 1.5mm, 3.0mm, 6.0mm
And/or 12.0mm.
Note 1. The gauges in Figures 9 and 10 can be used to confirm the appropriate sample size.
The thickness of the sample should not exceed 13.0 mm. In addition, other thicknesses may be used according to the agreement, and if so, they should be noted in the test report.
The edge of the specimen shall be smooth and the corner radius shall not exceed 1.3 mm.
At least 6 strip samples should be prepared for method A and at least 20 strip samples for method B.
Thickness measurement The center position of the sample is measured using a measuring scale, and the thickness values of the middle and both ends of the sample are measured with a micrometer.
For rigid specimens, the thickness shall be measured in accordance with ISO 16012. When using a ratchet micrometer, the speed of closing the micrometer should be
It is advisable to easily read the change on the scale or the digital reading. Continue to close the micrometer until the ratchet makes a squeaky sound 3 times, the friction sleeve
The tube is loose, or the two contact faces are in full contact with the sample. Record the indicated reading.
For flexible, non-rigid or flexible specimens, a metered micrometer can be used. And should stop when the pressure foot just touches the sample
Note 2. It can also be used to measure thickness if other measuring devices are suitable.
In order to accurately represent the nominal thickness of the sample, each measurement and total average should meet the tolerance requirements in Table 1.
Table 1 Tolerance of nominal thickness
Thickness x
< 0.02 ±10%
≤0.02~< 0.05 ±0.005
≤0.05~< 0.1 ±0.010
Table 1 (continued)
Thickness x
≤0.1~< 0.2 ±0.020
≤0.2~< 0.3 ±0.030
≤0.3~< 0.5 ±0.04
≤0.5~< 0.6 ±0.05
≤0.6~< 3.0 ±0.15
≤3.0~< 6.0 ±0.25
≤6.0~< 13.0 ±0.40
Note 3. For example, indicating a thickness of 1.5 mm, all samples should be measu...