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GB/T 13542.2-2021Plastic films for electrical purposes - Part 2: Methods of test (English PDF)

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

October 11, 2021

Implementation date

May 1, 2022

Scope

GB/T 13542.2-2021 (Plastic films for electrical purposes - Part 2: Methods of test) is available as an English-translated PDF.

GB/T 13542.2-2021 — This document describes the test methods for films used for electrical insulation. This document applies to films for electrical insulation.

Document preview — GB/T 13542.2-2021

National Standard of the People's Republic of China

Classification: K 15

Issued by: State Administration for Market Regulation, China National Standardization Administration

1 Scope1
2 Normative references1
3 Terms and definitions2
4 General description of the test2
4.1 Sampling2
4.2 Pretreatment conditions2
4.3 Test condition2
5 thickness2
5.1 Overview2
5.2 Mechanical Law3
5.2.1 Overview3
5.2.2 Single layer method3
5.2.2.1 Principle3
5.2.2.2 Measuring instrument3
5.2.2.3 Measurement3
5.2.2.4 Results3
5.2.3 Stacking method3
5.2.3.1 Measuring instrument3
5.2.3.2 Measurement3
5.2.3.3 Results3
5.3 Gravimetric method (mass density method)4
5.3.1 Determine the average thickness of the sample by gravimetric method4
5.3.1.1 Principle4
5.3.1.2 Measuring instrument4
5.3.1.3 Measurement4
5.3.1.4 Results4
5.3.2 Determine the average thickness of rolls by gravimetric method4
5.4 Lateral thickness distribution and longitudinal thickness variation4
6 Density4
7 width4
8 Windability (offset/curved or recessed)5
8.1 Principle5
8.2 Overview6
8.3 Method A6
8.3.1 Principle6
8.3.2 Offset/arc measurement6
8.3.2.1 Equipment6
8.3.2.2 Sample7
8.3.2.3 Procedure7
8.3.2.4 Results7
8.3.3 Measurement of depression7
8.3.3.1 Equipment7
8.3.3.2 Sample7
8.3.3.3 Procedure7
8.3.3.4 Results8
8.4 Method B8
8.4.1 Principle8
8.4.2 Equipment8
8.4.3 Sample8
8.4.4 Procedure8
8.4.5 Results9
9 Surface roughness9
9.1 Overview9
9.2 Measuring principle9
9.3 Test equipment and supplies9
9.4 Sample9
9.5 Procedure9
9.6 Results9
10 Porosity9
10.1 Test equipment9
10.2 Sample9
10.3 Procedure10
10.4 Results10
11 Coefficient of friction10
12 Wetting tension (polyolefin film)10
12.1 Principle10
12.2 Equipment10
12.3 Reagent10
12.4 Sample11
12.5 Condition processing11
12.6 Procedure12
12.7 Evaluation12
12.8 Results12
13 Tensile strength and elongation at break12
13.1 Overview12
13.2 Sample12
13.3 Test speed12
13.4 Procedure12
13.5 Test results13
14 Edge tearing13
14.1 Overview13
14.2 Sample13
14.3 Procedure13
14.4 Test results14
15 Internal tear14
16 Stiffness14
17 Surface resistivity14
18 Volume resistivity14
18.1 Method 1 Electrode method14
18.2 Method 2 Model capacitor method (applicable to winding capacitor dielectric films or thinner films for method 1)15
18.2.1 Principle15
18.2.2 Sample15
18.2.3 Equipment or appliances16
18.2.4 Procedure16
18.2.5 Results16
19 Dielectric dissipation factor and permittivity16
19.1 Overview16
19.2 Method 1 Contact electrode method16
19.2.1 Overview16
19.2.2 Sample and specimen handling16
19.2.3 Sample condition processing before measurement16
19.2.4 Contact electrode measurement17
19.2.4.1 Overview17
19.2.4.2 Electrode material18
19.2.4.2.1 Evaporating or vacuum spraying metal18
19.2.4.2.2 Conductive silver paint18
19.2.4.2.3 Metal foil18
19.3 Method 2 Non-contact electrode measurement18
19.3.1 Overview18
19.3.2 Air substitution method18
19.3.2.1 Variable pitch method18
19.3.2.1.1 Principle18
19.3.2.1.2 Electrode structure19
19.3.2.1.3 Measuring the bridge19
19.3.2.1.4 Sample19
19.3.2.1.5 Procedure19
19.3.2.1.6 Results20
19.3.2.2 Variable capacitance method20
19.3.2.2.1 Principle20
19.3.2.2.2 Electrode structure20
19.3.2.2.3 Measuring the bridge20
19.3.2.2.4 Sample20
19.3.2.2.5 Procedure20
19.3.2.2.6 Results21
19.3.3 Fluid discharge method21
19.4 Method 3 Model capacitor method21
19.4.1 Overview21
19.4.2 Equipment21
19.4.3 Sample22
19.4.4 Procedure22
19.4.5 Test results22
20 Dielectric loss factor in the immersed state23
21 Electric strength23
21.1 AC and DC test (sheet-like film sandwiched between metal electrodes)23
21.2 DC test (model capacitor element)23
21.2.1 Test device23
21.2.2 Samples and their preparation23
21.2.3 Procedure23
21.2.4 Test results23
21.3 DC test with film thickness less than or equal to 6µm23
22 Electric Weakness24
22.1 Overview24
22.2 Method A---Narrow Strip Test Method24
22.2.1 Test device24
22.2.2 Sample25
22.2.3 Procedure25
22.2.4 Results25
22.3 Method B---plate method25
22.3.1 Overview25
22.3.2 Test device26
22.3.3 Procedure26
22.3.4 Results26
22.4 Method C---wide strip roll test method27
22.4.1 Overview27
22.4.2 Unwinding system27
22.4.2.1 Overview27
22.4.2.2 Method C127
22.4.2.3 Method C227
22.4.2.4 Method C328
22.4.3 Weakness Counter29
22.4.4 Procedure29
22.4.5 Results29
23 Resistance to surface discharge breakdown29
24 Electrolytic corrosion30
25 melting point30
25.1 Method A---DSC Method30
25.2 Method B-Meniscus Method30
25.2.1 Overview30
25.2.2 Test equipment and materials30
25.2.3 Sample30
25.2.4 Procedure30
25.2.5 Results31
26 Shrinkage rate31
26.1 Sample31
26.2 Procedure31
26.3 Results32
27 Dimensional stability under tension32
27.1 Equipment32
27.2 Sample32
27.3 Procedure32
27.4 Results33
28 Dimensional stability under pressure33
28.1 Equipment33
28.2 Sample33
28.3 Procedure33
28.4 Results34
29 High temperature penetration resistance34
29.1 Overview34
29.2 Principle34
29.3 Equipment34
29.4 Specimen35
29.5 Procedure35
29.6 Results35
30 Volatile content (thermal weight loss)35
30.1 Equipment35
30.2 Sample35
30.3 Procedure36
30.4 Results36
31 Long-term heat resistance36
32 Combustibility36
32.1 Method A36
32.1.1 Principle36
32.1.2 Equipment36
32.1.3 Sample37
32.1.4 Conditional processing37
32.1.5 Procedure37
32.1.6 Explanation of results37
32.2 Method B38
33 Hygroscopicity in humid air38
33.1 Equipment or appliances38
33.2 Specimen38
33.3 Procedure38
33.3.1 Hygroscopicity of materials in receipt state38
33.3.2 Hygroscopicity of dry materials38
33.3.3 Results39
34 Liquid absorption39
34.1 Principle39
34.2 Equipment39
34.3 Sample39
34.4 Procedure39
34.5 Results40
35 Ionic impurity extraction40
36 Influence of insulating varnish/liquid polymerizable resin compound40
36.1 Equipment40
36.2 Sample40
36.3 Procedure40
36.3.1 Insulating paint40
36.3.2 Liquid polymerizable resin compound41
36.4 Results41
References42
Figure 1 Schematic diagram of winding property measurement (method A offset/arc measurement)5
Figure 2 Schematic diagram of winding property measurement (method A offset/arc measurement and method B offset/arc, dent measurement)5
Figure 3 Schematic diagram of winding property measurement (measurement of dent)6
Figure 4 Schematic diagram of edge tear test14
Figure 5 Schematic diagram of the sample structure of a model capacitor for measuring volume resistivity15
Figure 6 Three-electrode system for low frequency (maximum 50kHz) measurement17
Figure 7 Two-electrode system for high frequency (above 50kHz) measurement17
Figure 8 The principle of non-contact electrode structure Figure19
Figure 9 Schematic diagram of sample structure for measuring dielectric loss factor and permittivity22
Figure 10 The principle diagram of the breakdown measurement system for thin films with a thickness less than or equal to 6 µm24
Figure 11 Schematic diagram of electric weakness test (Method A)25
Figure 12 Schematic diagram of electric weakness test (Method B)26
Figure 13 Schematic diagram of electric weakness test (Method C1)27
Figure 14 Schematic diagram of electrical weakness test (Method C2)28
Figure 15 Schematic diagram of electric weakness test28
Figure 16 Schematic diagram of melting point determination by meniscus method31
Figure 17 Schematic diagram of dimensional stability test under tension33
Figure 18 Schematic diagram of dimensional stability test under pressure34
Figure 19 Schematic diagram of high temperature resistance penetration tester35
Table 1 The concentration of the mixture of ethylene glycol monoethyl ether and formamide used when measuring the wetting tension of polyethylene and polypropylene films11
Table 2 Material self-extinguishing classification38

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"

Drafting.

This document is Part 2 of GB/T 13542 "Film for Electrical Insulation". GB/T 13542 has released the following parts.

---Part 1.Definitions and general requirements;

---Part 2.Test method;

---Part 3.Biaxially oriented polypropylene film for capacitors;

---Part 4.Polyester film;

---Part 6.Polyimide film for electrical insulation.

This document replaces GB/T 13542.2-2009 "Films for Electrical Insulation Part 2.Test Methods", and is compatible with GB/T 13542.2-2009

Compared with.2009, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

a) Modified the measurement value of the single-layer method in 5.2.2 thickness measurement from 27 times to 9 times (see 5.2.2.3, 4.1.1.3 of the.2009 edition);

b) In 5.4 "Transverse thickness distribution and longitudinal thickness change", "Usually use infrared or laser non-contact measurement methods to measure thickness

Spend. If the film forming and winding thickness changes are required, the manufacturer installs this measuring device on the production line. Measurement minimum score

The resolution, accuracy, and measurement surface area (width and length) are specified in the product standard (see 5.4,.2009 edition

4.4);

c) Chapter 8 "Coilability (Offset/Curved and Concavity)", adds the content of the principles of Method A and Method B (see 8.3.1 and 8.4.1,

7.2 and 7.3 of the.2009 edition);

d) Chapter 11 "Coefficient of Friction", "Principle" is added (see Chapter 11, Chapter 9 of the.2009 edition);

e) Chapter 13 "Tensile Strength and Elongation at Break" is revised to the method according to GB/T 1040.3-2006 (see Chapter 13,.2009

Chapter 11 of the edition); Chapter 14 "Edge tearing" is modified to follow the method of Chapter 10 in GB/T 1310.2-2009 (see Chapter

Chapter 14, Chapter 12 of the.2009 edition); Chapter 15 "Internal tearing" adds the measurement method of GB/T 16578.1 (see Chapter 15

Chapter, Chapter 13 of the.2009 edition);

f) Chapter 17 "Surface resistivity" is revised to the method according to GB/T 31838.3 (see Chapter 17, Chapter 15 of the.2009 edition);

Chapter 18 "Volume Resistivity" Method 1 The electrode method is modified to the method of GB/T 31838.2, and the diameter of the high-voltage electrode is determined by

27mm is modified to at least 40mm (see 18.1, 16.1 of the.2009 edition);

g) Chapter 20 "Dielectric loss factor under immersion state" is added (see Chapter 20);

h) Chapter 21 "Electrical Strength" has added the DC test method according to GB/T 1408.2 (see 21.1, 18.2 of the.2009 edition) and

Direct current test clauses for thin films less than or equal to 6µm (see 21.3);

i) Chapter 22 "Electrical Weakness", modify Method C to Method C1, Method C2 or Method C3 (see 22.4,.2009 edition of 19.3);

j) Chapter 23 "Surface discharge breakdown resistance", amended to comply with GB/T 22689 (see Chapter 23, Chapter 20 of the.2009 edition); Chapter 25

Chapter "Melting Point" DSC method was revised from the method according to IEC 61074.1991 to the method according to GB/T 19466.3 (see 25.1,.2009 edition)

22.1); Chapter 29 "High Temperature Penetration Resistance", amended to be in accordance with Chapter 10 of GB/T 20631.2-2006 (see Chapter 29,

Chapter 26 of the.2009 edition);

k) Chapter 32 "Combustibility", method B is added, according to the test method in Chapter 20 of GB/T 20631.2-2006 (see 32.2).

This document uses the redrafting method to modify and adopt IEC 60674-2.2019 "Plastic Film for Electrical Use Part 2.Test Methods".

Compared with IEC 60674-2.2019, this document combines Chapter 35 and Chapter 36 into one chapter in structure.

Compared with IEC 60674-2.2019, this document has technical differences.

The vertical single line (%00) of the position is marked.

The technical differences between this document and IEC 60674-2.2019 and the reasons are as follows.

a) Regarding normative reference documents, this document has made adjustments with technical differences to adapt to my country's technical conditions and adjustments.

The situation is collectively reflected in Chapter 2 "Normative Reference Documents", and the specific adjustments are as follows.

1) Replace ISO 534 with GB/T 451.3, which is equivalent to adopting international standards;

2) Replace ISO 1183 with GB/T 1033.1, which is equivalent to the international standard;

3) Replace IEC 60243-2 with GB/T 1408.2 which is equivalent to adopting international standards;

4) Replace IEC 60250.1969 with GB/T 1409-2006 which is modified to adopt international standards;

5) Replace ISO 4593 with GB/T 6672 which is equivalent to adopting international standards;

6) Replace ISO 4592 with GB/T 6673 which is equivalent to adopting international standards;

7) Replace IEC 60589 with GB/T 7196 which is equivalent to adopting international standards;

8) Replace ISO 8295 with GB/T 10006, which is equivalent to adopting international standards;

9) Replace IEC 60426 with GB/T 10582 which is equivalent to adopting international standards;

10) Replace IEC 60216 (all parts) with GB/T 11026 (all parts) equivalent to adopting international standards;

11) Replaced with GB/T 13542.3, GB/T 13542.4, and GB/T 13542.6 which are modified to adopt international standards

IEC 60674-3 (all parts);

12) Replace ISO 6383-1 with GB/T 16578.1 which is equivalent to adopting international standards;

13) Replace ISO 6383-2 with GB/T 16578.2 which is equivalent to the international standard;

14) Replace ISO 11357-3.2011 with GB/T 19466.3 which is equivalent to adopting international standards;

15) Replace IEC 60454-2.2007 with GB/T 20631.2-2006, which is equivalent to adopting international standards;

16) Replace IEC 60343 with GB/T 22689 which is equivalent to adopting international standards;

17) Replace IEC 62631-3-1 with GB/T 31838.2 which is equivalent to adopting international standards;

18) Replace IEC 62631-3-2 with GB/T 31838.3 which is equivalent to adopting international standards;

19) Added normative reference document GB/T 25915.1-2010.

b) A chapter "Terms and Definitions" has been added (see Chapter 3).

c) For ease of use, test conditions have been added in 4.3 (see 4.3).

d) For the convenience of use, in Chapter 5 "Thickness", the regulations on measuring instruments, measurement procedures and calculation formula of "mass density method" have been added.

Formula (see 5.2.2.2, 5.2.3.1, 5.3.1.2~5.3.1.4).

e) Taking into account the actual needs of our country, in Chapter 8 "Winding", the "Diameter of the roller in the "equipment" clause is 100mm +/-

"10mm" is revised to "The diameter of the roller is 100mm+/-1mm" (see Chapter 8).

f) Taking into account the actual needs of our country, specific measurement methods have been added to Chapter 9 "Surface Roughness" (see Chapter 9).

g) Taking into account the actual needs of our country, in Chapter 10 "void ratio" added test instruments, samples and procedures (see 10.1, 10.2, 10.3).

h) Taking into account the actual needs of our country, in Chapter 13 "Tensile Strength and Elongation at Break", test procedures and result calculations have been added (see

13.4 and 13.5).

i) Taking into account the actual needs of our country, in Chapter 14 "Edge Tearness", samples, test procedures, test results and schematic diagrams have been added

(See 14.2, 14.3, 14.4).

j) Taking into account the actual needs of our country, in Chapter 18 "Volume Resistivity", Figure 4 and equipment or appliances are added (see 18.2.2 and

18.2.3).

k) Taking into account the actual needs of our country, in Chapter 19 "Dielectric Dissipation Factor and Permittivity", IEC 60674-2 (2001 No.

1st revision) "Non-contact electrode measurement" method (variable capacitance method, variable spacing method), and refined the calculation formula;

The "Capacitor Method" has been refined and the calculation formula has been added (see 19.3.2.1 and 19.3.2.2); in the "Fluid Discharge Method" has been added

Equipment, samples and test results (see 19.4).

l) For the convenience of use, in Chapter 21 "Electrical Strength", the test device, sample and its preparation and procedures have been added to the "DC Test"

And test results (see 21.2.1~21.2.4).

m) Taking into account the actual needs of our country, the thickness of the aluminum foil electrode in the "Electrical Weakness" test in Chapter 22 is changed from 6µm to 7µm, and the

The applied DC voltage is changed from 100V/µm to the voltage value of.200V/µm specified in the product standard (see 22.2.1 and 22.3.2).

n) Taking into account the actual needs of our country, "Method B-Meniscus Method" (see 25.2) has been added to Chapter 25 "Melting Point".

o) For ease of use, in Chapter 26 "Shrinkage Rate", the calculation formula for the result has been added (see 26.3).

p) For ease of use, in Chapter 27 "Dimensional stability under tension" and Chapter 28 "Dimensional stability under pressure", equipment and

Schematic diagram of the test (see 27.1, 28.1 and Figure 18).

q) For ease of use, in Chapter 29 "High Temperature Penetration Resistance", equipment, procedures and test diagrams have been added (see 29.3 and 29.5).

r) For ease of use, in Chapter 30 "Volatile Content", equipment has been added (see 30.1).

s) Taking into account the actual needs of our country, in Chapter 32 "Combustibility", the "sample distance from the top of the burner 9.5mm" is changed to "sample distance

The tip of the burner is 10mm" (see 32.1.5); test method B has been added (see 32.2).

t) For ease of use, in Chapter 33 "Hygroscopicity in Moist Air", the calculation formula for the result has been added (see 33.3.3).

The following editorial changes have been made to this document.

--- In order to coordinate with existing standards, the standard name is revised to "Electrical Insulating Film Part 2.Test Methods."

Introduction

The electrical insulation film standards are widely used in the research and development, production, quality inspection, sales, acceptance and technical exchanges of this series of products.

GB/T 13542.2-2009 mainly solves the problem that the standard is too long because of its long standard age, and many contents need to be based on new changes in the current product test method.

The actual needs and urgent need to amend and improve the problem, IEC also launched IEC 60674-2.2019 (version 2.1) according to technological development, so it is necessary

Follow the changes in international standards to revise the original national standards. The revised standard can ensure its timeliness and scientificity, and it is suitable for electrical insulating films.

The test method standards have been re-regulated, which can guide the industry to more effectively carry out the testing and evaluation of electrical insulating films, which can improve electrical

The quality and application reliability of gas insulating film products.

Electrical insulating films involve many types of products, and the corresponding IEC 60674 (Plastic Film Specification for Electrical Uses) standard is divided into different parts.

Compiled separately (or articles), in order to maintain the basic consistency with the corresponding IEC standard compilation method, plus the technical performance of different types of film products

The requirements are also different, and different parts need to be listed separately when compiling this product standard.

GB/T 13542 specifies the definition and general requirements, test methods, and product standards of individual materials for electrical insulating films.

Partial composition.

---Part 1.Definitions and general requirements. The purpose is to determine the terms and definitions and general requirements of electrical insulating films.

---Part 2.Test method. The purpose is to determine the test method for electrical insulating films.

---Part 3.Biaxially oriented polypropylene film for capacitors. The purpose is to determine the classification of biaxially oriented polypropylene film for capacitors

And naming, size, performance requirements and film characteristics.

---Part 4.Polyester film. The purpose is to determine the classification, size, performance requirements and film characteristics of polyester film for electrical insulation.

---Part 6.Polyimide film for electrical insulation. The purpose is to determine the classification and naming and size of polyimide film for electrical insulation

Dimensions, performance requirements and film roll characteristics.

Films for electrical insulation. Part 2.Test methods

1 Scope

This document describes the test methods for films used for electrical insulation.

This document applies to films for electrical insulation.

2 Normative references

The content of the following documents constitutes an indispensable clause of this document through normative references in the text. Among them, dated quotations

Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to

This document.

GB/T 451.3 Measurement of paper and cardboard thickness (GB/T 451.3-2002, idtISO 534.1988)

GB/T 1033.1 Determination of the density of plastic non-foam plastics Part 1.Immersion method, liquid pycnometer method and titration method

(GB/T 1033.1-2008, ISO 1183-1.2004, IDT)

GB/T 1040.3-2006 Determination of tensile properties of plastics Part 3.Test conditions for films and sheets (ISO 527-3.

1995, IDT)

GB/T 1310.2-2009 Impregnated fabrics for electrical purposes Part 2.Test methods (IEC 60394-2.1972, IDT)

GB/T 1408.1-2016 Insulating material electric strength test method Part 1.Power frequency test (IEC 60243-1.2013,

IDT)

GB/T 1408.2 Insulating material electric strength test method Part 2.Additional requirements for applied DC voltage test

(GB/T 1408.2-2016, IEC 60243-2.2013, IDT)

GB/T 1409-2006 Determines the permittivity and dielectric loss of electrical insulating materials at power frequency, audio frequency, and high frequency (including meter wave wavelength)

Recommended method of dissipation factor (IEC 60250.1969, MOD)

GB/T 6672 Plastic film and sheet thickness determination mechanical measurement method (GB/T 6672-2001, idtISO 4593.1993)

GB/T 6673 Determination of the length and width of plastic films and sheets (GB/T 6673-2001, idtISO 4592.1992)

GB/T 7196 Test method for determination of ionic impurities in electrical insulating materials by liquid extraction (GB/T 7196-2012, IEC 60589.

1997, IDT)

GB/T 10006 Plastic film and sheet friction coefficient determination method (GB/T 10006-2021, ISO 8295.1995, IDT)

GB/T 10580-2015 Standard conditions for solid insulating materials before and during the test (IEC 60212.2010, IDT)

GB/T 10582 Test method for electrical insulating materials to determine electrolytic corrosion caused by insulating materials (GB/T 10582-2008,

IEC 60426.2007, IDT)

GB/T 11026 (all parts) Heat resistance of electrical insulating materials [IEC 60216 (all parts)]

GB/T 13542.3 Films for electrical insulation Part 3.Biaxially oriented polypropylene film for capacitors (GB/T 13542.3-

2006, IEC 60674-3-1..1998, MOD)

GB/T 13542.4 Film for electrical insulation Part 4.Polyester film (GB/T 13542.4-2009, IEC 60674-3-2.

1992, MOD)

GB/T 13542.6 Film for electrical insulation Part 6.Polyimide film for electrical insulation (GB/T 13542.6-2006,

IEC 60674-3-4/6.1993, MOD)

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — all pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 451.3 · GB/T 451.3-2002 · GB/T 1033.1 · GB/T 1033.1-2008 · ISO 1183 · GB/T 1040.3-2006 · ISO 527 · GB/T 1310.2-2009 · IEC 60394 · GB/T 1408.1-2016 · IEC 60243 · GB/T 1408.2 · GB/T 1408.2-2016 · GB/T 1409-2006 · IEC 60250.1969 · GB/T 6672 · GB/T 6672-2001 · GB/T 6673 · GB/T 6673-2001 · GB/T 7196 · GB/T 7196-2012 · IEC 60589 · ISO 8295.1995 · GB/T 10580-2015 · IEC 60212.2010 · GB/T 10582 · GB/T 10582-2008 · IEC 60426.2007 · GB/T 11026 · IEC 60216 · GB/T 13542.3 · IEC 60674 · GB/T 13542.4 · GB/T 13542.4-2009 · GB/T 13542.6 · GB/T 13542.6-2006

Cited by

GB/T 13542.5-2022Films used for electrical insulation - Part 5: Balanced biaxially oriented polyethylene naphthalate films

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