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IEC 60674-2:2016

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Specification for plastic films for electrical purposes - Part 2: Methods of test
Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Superseded date

01-24-2019

Published date

11-18-2016

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 General notes on tests
4 Thickness
5 Density
6 Width
7 Windability (bias/camber and sag)
8 Surface roughness
9 Space factor
10 Coefficient of friction
11 Wetting tension (polyolefine films)
12 Tensile properties
13 Edge tearing resistance
14 Tear resistance
15 Stiffness of film
16 Surface resistivity
17 Volume resistivity
18 Dissipation factor and permittivity
19 Dissipation factor under impregnated conditions
20 Electric strength
21 Electrical weak spots
22 Resistance to breakdown by surface discharges
23 Electrolytic corrosion
24 Melting point
25 Dimensional change
26 Dimensional stability under tension with rising
   temperature
27 Dimensional stability under pressure with rising
   temperature
28 Resistance to penetration at elevated temperature
29 Volatile content (loss of mass on heating)
30 Thermal endurance
31 Burning characteristics
32 Water absorption in a damp atmosphere
33 Absorption of liquid
34 Ionic impurities
35 Effect of insulating varnishes
36 Effect of polymerisable resinous compounds in
   a liquid state

IEC 60674-2:2016 is applicable to plastic films used for electrical purposes. This part of IEC 60674 gives methods of test. This second edition cancels and replaces the first edition published in 1988 and Amendment 1 (2001). This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- this document was completely revised editorially and technically and included in the IEC 60674 series of standards;
- the test methods are updated to reflect today's state of the art;
- a method to obtain DC electric strength is now specified according to IEC 60243-2. Keywords: plastic films for electrical purposes
The contents of the corrigendum of December 2017 have been included in this copy.

Committee
TC 15
DevelopmentNote
Stability Date: 2020. (11/2016)
DocumentType
Standard
ISBN
978-2-8322-6425-6
Pages
89
PublisherName
International Electrotechnical Committee
Status
Superseded
SupersededBy
Supersedes

I.S. EN 60243-2:2014 ELECTRIC STRENGTH OF INSULATING MATERIALS - TEST METHODS - PART 2: ADDITIONAL REQUIREMENTS FOR TESTS USING DIRECT VOLTAGE
BS EN 60243-2:2014 Electric strength of insulating materials. Test methods Additional requirements for tests using direct voltage
BS EN 60674-3-2:1998 Specification for plastic films for electrical purposes. Specifications for individual materials Requirements for balanced biaxially oriented polyethylene terephthalate (PET) films used for electrical insulation
NF EN 60674 3 4 TO-6 : 1995 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEETS 4 TO 6: REQUIREMENTS FOR POLYIMIDE FILMS USED FOR ELECTRICAL INSULATION
BS EN 60674-3-8 : 2011 PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 8: BALANCED BIAXIALLY ORIENTED POLYETHYLENE NAPHTHALATE (PEN) FILMS USED FOR ELECTRICAL INSULATION (IEC 60674-3-8:2011)
BS 7290-1(1990) : 1990 AMD 10058 PLASTIC FILMS FOR ELECTRICAL PURPOSES - DEFINITIONS AND GENERAL REQUIREMENTS
CEI EN 60674-3-3 : 1999 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 3: REQUIREMENTS FOR POLYCARBONATE (PC) FILMS USED FOR ELECTRICAL INSULATION
VDE 0345-3-2 : 1999 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS; SHEET 2: REQUIREMENTS FOR BALANCED BIAXIALLY ORIENTED POLYETHYLENE TEREPHTHALATE (PET) FILMS USED FOR ELECTRICAL INSULATION
CEI EN 60674-3-7 : 1999 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 7: REQUIREMENTS FOR FLUOROETHYLENE-PROPYLENE (FEP) FILMS USED FOR ELECTRICAL INSULATION
IEC 60674-3-8:2011+AMD1:2016 CSV Plastic films for electrical purposes - Part 3: Specifications for individual materials - Sheet 8: Balanced biaxially oriented polyethylene naphthalate (PEN) films used for electrical insulation
EN 60674-3-3:1998 Specification for plastic films for electrical purposes - Part 3: Specifications for individual materials - Sheet 3: Requirements for polycarbonate (PC) films used for electrical insulation
EN 60243-1:2013 ELECTRIC STRENGTH OF INSULATING MATERIALS - TEST METHODS - PART 1: TESTS AT POWER FREQUENCIES (IEC 60243-1:2013)
EN 60243-2:2014 Electric strength of insulating materials - Test methods - Part 2: Additional requirements for tests using direct voltage
BS 7290-3.3(1995) : 1995 AMD 10108 PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SEC3.3: REQUIREMENTS FOR POLYCARBONATE (PC) FILMS USED FOR ELECTRICAL INSULATION
PD IEC/TS 62332-3:2016 Electrical insulation systems (EIS). Thermal evaluation of combined liquid and solid components Hermetic motor-compressors
11/30258054 DC : 0 BS EN 60243-1 - ELECTRICAL STRENGTH OF INSULATING MATERIALS - TEST METHODS - PART 1: TESTS AT POWER FREQUENCIES
BS 7290-3.7(1995) : 1995 AMD 10109 PLASTIC FILMS FOR ELECTRICAL PURPOSES - SPECIFICATIONS FOR INDIVIDUAL MATERIALS - REQUIREMENTS FOR FLUOROETHYLENE-PROPYLENE (FEP) FILMS USED FOR ELECTRICAL INSULATION
BS 7290-3.2(1995) : 1995 AMD 10107 PLASTIC FILMS FOR ELECTRICAL PURPOSES - SPECIFICATIONS FOR INDIVIDUAL MATERIALS - REQUIREMENTS FOR BALANCED BIAXIALLY ORIENTED POLYETHYLENE TEREPHTHALATE (PET) FILMS USED FOR ELECTRICAL INSULATION
I.S. EN 60674-3-1:1999 PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 1: BIAXIALLY ORIENTED POLYPROPYLENE (PP) FILM FOR CAPACITORS (IEC 60674-3-1:1998)
EN ISO 13000-1:2005 Plastics - Polytetrafluoroethylene (PTFE) semi-finished products - Part 1: Requirements and designation (ISO 13000-1:2005)
IEC TS 62332-3:2016 Electrical insulation systems (EIS) - Thermal evaluation of combined liquid and solid components - Part 3: Hermetic motor-compressors
IEC 62899-201:2016 Printed electronics - Part 201: Materials - Substrates
I.S. EN ISO 13000-2:2006 PLASTICS - POLYTETRAFLUOROETHYLENE (PTFE) SEMI-FINISHED PRODUCTS - PART 2: PREPARATION OF TEST SPECIMENS AND DETERMINATION OF PROPERTIES
I.S. EN ISO 13000-1:2006 PLASTICS - POLYTETRAFLUOROETHYLENE (PTFE) SEMI-FINISHED PRODUCTS - PART 1: REQUIREMENTS AND DESIGNATION
VDE 0345-3-7 : 1999 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS; SHEET 7: REQUIREMENTS FOR FLUOROETHYLENE-PROPYLENE (FEP) FILMS USED FOR ELECTRICAL INSULATION
DIN EN 60674-3-3 : 1999 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS; SHEET 3: REQUIREMENTS FOR POLYCARBONATE (PC) FILMS USED FOR ELECTRICAL INSULATION
DIN EN 60674-3-4 TO 6 : 1999 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS; SHEETS 4 TO 6: REQUIREMENTS FOR POLYIMIDE FILMS USED FOR ELECTRICAL INSULATION
VDE 0345-3-3 : 1999 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS; SHEET 3: REQUIREMENTS FOR POLYCARBONATE (PC) FILMS USED FOR ELECTRICAL INSULATION
DIN EN 60674-3-7 : 1999 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS; SHEET 7: REQUIREMENTS FOR FLUOROETHYLENE-PROPYLENE (FEP) FILMS USED FOR ELECTRICAL INSULATION
VDE 0345-3-4 BIS 6 : 1999 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS; SHEETS 4 TO 6: REQUIREMENTS FOR POLYIMIDE FILMS USED FOR ELECTRICAL INSULATION
CEI EN 60674-3-8 : 2012 PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 8: BALANCED BIAXIALLY ORIENTED POLYETHYLENE NAPHTHALATE (PEN) FILMS USED FOR ELECTRICAL INSULATION
BS EN 60674-3-3:1998 Specification for plastic films for electrical purposes. Specifications for individual materials Requirements for polycarbonate (PC) films used for electrical insulation
14/30304003 DC : 0 BS EN 62899-1 ED.1 - PRINTED ELECTRONICS - MATERIALS - PART 1: SUBSTRATES
NF EN 60674-3-8 : 2012 AMD 1 2017 PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 8: BALANCED BIAXIALLY ORIENTED POLYETHYLENE NAPHTHALATE (PEN) FILMS USED FOR ELECTRICAL INSULATION
BS EN 60674-3-7:1998 Specification for plastic films for electrical purposes. Specifications for individual materials Requirements for fluoroethylene-propylene (FEP) films used for electrical insulation
NF EN 60674 3-3 : 1998 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 3: REQUIREMENTS FOR POLYCARBONATE (PC) FILMS USED FOR ELECTRICAL INSULATION
I.S. EN 60243-1:2013 ELECTRIC STRENGTH OF INSULATING MATERIALS - TEST METHODS - PART 1: TESTS AT POWER FREQUENCIES (IEC 60243-1:2013 (EQV))
I.S. EN 60674-3-7:1999 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 7: REQUIREMENTS FOR FLUOROETHYLENE-PROPYLENE (FEP) FILMS USED FOR ELECTRICAL INSULATION
CEI EN 60243-2 : 2015 ELECTRIC STRENGTH OF INSULATING MATERIALS - TEST METHODS - PART 2: ADDITIONAL REQUIREMENTS FOR TESTS USING DIRECT VOLTAGE
NF EN 60674 3-2 : 1998 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 2: REQUIREMENTS FOR BALANCED BIAXIALLY ORIENTED POLYETHYLENE TEREPHTALATE (PET) FILMS USED FOR ELECTRICAL INSULATION
I.S. EN 60626-3:2008 COMBINED FLEXIBLE MATERIALS FOR ELECTRICAL INSULATION - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS (IEC 60626-3:2008 (EQV))
BS EN ISO 13000-1:2005 Plastics. Polytetrafluoroethylene (PTFE) semi-finished products Requirements and designation
ISO 13000-1:2005 Plastics Polytetrafluoroethylene (PTFE) semi-finished products Part 1: Requirements and designation
DIN EN 60674-3-2 : 1999 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS; SHEET 2: REQUIREMENTS FOR BALANCED BIAXIALLY ORIENTED POLYETHYLENE TEREPHTHALATE (PET) FILMS USED FOR ELECTRICAL INSULATION
NF EN 60674 3-1 : 1998 AMD 1 2012 PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 1: BIAXIALLY ORIENTED POLYPROPYLENE (PP) FILM FOR CAPACITORS
NF EN 60674 3-7 : 1998 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 7: REQUIREMENTS FOR FLUOROETHYLENE-PROPYLENE (FEP) FILMS USED FOR ELECTRICAL INSULATION
BS EN 60626-3 : 2008 COMBINED FLEXIBLE MATERIALS FOR ELECTRICAL INSULATION - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS
BS EN 60243-1:2013 Electric strength of insulating materials. Test methods Tests at power frequencies
I.S. EN 60674-3-4 TO 6:1997 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEETS 4 TO 6: REQUIREMENTS FOR POLYIMIDE FILMS USED FOR ELECTRICAL INSULATION
BS EN 60674-3-1 : 1998 PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 1: BIAXIALLY ORIENTED POLYPROPYLENE (PP) FILM FOR CAPACITORS
I.S. EN 60674-3-3:1999 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 3: REQUIREMENTS FOR POLYCARBONATE (PC) FILMS USED FOR ELECTRICAL INSULATION
BS IEC 62899-201 : 2016 PRINTED ELECTRONICS - PART 201: MATERIALS - SUBSTRATES
CEI EN 60243-1 : 2014 ELECTRIC STRENGTH OF INSULATING MATERIALS - TEST METHODS - PART 1: TESTS AT POWER FREQUENCIES
CEI EN 60674-3-4/6 : 1998 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEETS 4 TO 6: REQUIREMENTS FOR POLYIMIDE FILMS USED FOR ELECTRICAL INSULATION
I.S. EN 60674-3-2:1999 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 2: REQUIREMENTS FOR BALANCED BIAXIALLY ORIENTED POLYETHYLENE TEREPHTHALATE (PET) FILMS USED FOR ELECTRICAL INSULATION
BS EN ISO 13000-2:2005 Plastics. Polytetrafluoroethylene (PTFE) semi-finished products Preparation of test specimens and determination of properties
IEC 60674-3-3:1992 Specification for plastic films for electrical purposes - Part 3:Specifications for individual materials - Sheet 3: Requirements forpolycarbonate (PC) films used for electrical insulation
IEC 60674-3-1:1998+AMD1:2011 CSV Plastic films for electrical purposes - Part 3: Specifications for individual materials - Sheet 1: Biaxially oriented polypropylene (PP) films for capacitors
IEC 60674-3-7:1992 Specification for plastic films for electrical purposes - Part 3: Specifications for individual materials - Sheet 7: Requirements for fluoroethylene-propylene (FEP) films used for electrical insulation
IEC 60243-1:2013 Electric strength of insulating materials - Test methods - Part 1: Tests at power frequencies
ISO 13000-2:2005 Plastics Polytetrafluoroethylene (PTFE) semi-finished products Part 2: Preparation of test specimens and determination of properties
IEC 60243-2:2013 Electric strength of insulating materials - Test methods - Part 2: Additional requirements for tests using direct voltage
04/30091874 DC : DRAFT FEB 2004 BS EN ISO 13000-1 - PLASTICS - POLYTETRAFLUOROETHYLENE (PTFE) SEMI-FINISHED PRODUCTS - PART 1: REQUIREMENTS AND DESIGNATION
BS EN 60674-3-4 to 6:1995 Specification for plastic films for electrical purposes. Specifications for individual materials Requirements for polyimide films used for electrical insulation
CEI EN 60674-3-2 : 1999 SPECIFICATION FOR PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 2: REQUIREMENTS FOR BALANCED BIAXIALLY ORIENTED POLYETHYLENE TEREPHTHALATE (PET) FILMS USED FOR ELECTRICAL INSULATION
I.S. EN 60674-3-8:2011 PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 8: BALANCED BIAXIALLY ORIENTED POLYETHYLENE NAPHTHALATE (PEN) FILMS USED FOR ELECTRICAL INSULATION
EN ISO 13000-2:2005 Plastics - Polytetrafluoroethylene (PTFE) semi-finished products - Part 2: Preparation of test specimens and determination of properties (ISO 13000-2:2005)
EN 60626-3:2008/A1:2012 COMBINED FLEXIBLE MATERIALS FOR ELECTRICAL INSULATION - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS (IEC 60626-3:2008/A1:2012)
EN 60674-3-8:2011/A1:2017 PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 8: BALANCED BIAXIALLY ORIENTED POLYETHYLENE NAPHTHALATE (PEN) FILMS USED FOR ELECTRICAL INSULATION (IEC 60674-3-8:2011/A1:2016)
EN 60674-3-1:1998/A1:2011 PLASTIC FILMS FOR ELECTRICAL PURPOSES - PART 3: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - SHEET 1: BIAXIALLY ORIENTED POLYPROPYLENE (PP) FILM FOR CAPACITORS (IEC 60674-3-1:1998/A1:2011)
IEC 60626-3:2008+AMD1:2012 CSV Combined flexible materials for electrical insulation - Part 3:Specifications for individual materials
IEC 60674-3-2:1992 Specification for plastic films for electrical purposes - Part 3: Specifications for individual materials - Sheet 2: Requirements for balanced biaxially oriented polyethylene terephthalate (PET) films used for electrical insulation
EN 60674-3-2:1998 Specification for plastic films for electrical purposes - Part 3: Specifications for individual materials - Sheet 2: Requirements for balanced biaxially oriented polyethylene terephthalate (PET) films used for electrical insulation
DIN EN ISO 13000-2:2006-02 Plastics - Polytetrafluoroethylene (PTFE) semi-finished products - Part 2: Preparation of test specimens and determination of properties (ISO 13000-2:2005)
DIN EN ISO 13000-1:2006-02 Plastics - Polytetrafluoroethylene (PTFE) semi-finished products - Part 1: Requirements and designation (ISO 13000-1:2005)
EN 60674-3-4 to 6:1995 Specification for plastic films for electrical purposes - Part 3: Specifications for individual materials - Sheets 4 to 6: Requirements for polyimide films used for electrical insulation
EN 60674-3-7 : 1998 Specification for plastic films for electrical purposes - Part 3: Specifications for individual materials - Sheet 7: Requirements for fluoroethylene-propylene (FEP) films used for electrical insulation

IEC 60243-1:2013 Electric strength of insulating materials - Test methods - Part 1: Tests at power frequencies
IEC 60454-2:2007 Pressure-sensitive adhesive tapes for electrical purposes - Part 2: Methods of test
IEC 60212:2010 Standard conditions for use prior to and during the testing of solid electrical insulating materials
IEC 60250:1969 Recommended methods for the determination of the permittivity and dielectric dissipation factor of electrical insulating materials at power, audio and radio frequencies including metre wavelengths
IEC 60343:1991 Recommended test methods for determining the relative resistance of insulating materials to breakdown by surface discharges
IEC 62631-3-2:2015 Dielectric and resistive properties of solid insulating materials - Part 3-2: Determination of resistive properties (DC methods) - Surface resistance and surface resistivity
IEC 62631-3-1:2016 Dielectric and resistive properties of solid insulating materials - Part 3-1: Determination of resistive properties (DC methods) - Volume resistance and volume resistivity - General method
ISO 4591:1992 Plastics — Film and sheeting — Determination of average thickness of a sample, and average thickness and yield of a roll, by gravimetric techniques (gravimetric thickness)
IEC 60394-2:1972 Varnished fabrics for electrical purposes. Part 2: Methods of test
ISO 11357-3:2011 Plastics Differential scanning calorimetry (DSC) Part 3: Determination of temperature and enthalpy of melting and crystallization
ISO 1183:1987 Plastics Methods for determining the density and relative density of non-cellular plastics
IEC 60589:1977 Methods of test for the determination of ionic impurities in electrical insulating materials by extraction with liquids
IEC TR 60648:1979 Method of test for coefficients of friction of plastic film and sheeting for use as electrical insulation
IEC 60426:2007 Electrical insulating materials - Determination of electrolytic corrosion caused by insulating materials - Test methods
ISO 534:2011 Paper and board — Determination of thickness, density and specific volume
IEC 60243-2:2013 Electric strength of insulating materials - Test methods - Part 2: Additional requirements for tests using direct voltage
ISO 6383-2:1983 Plastics Film and sheeting Determination of tear resistance Part 2: Elmendorf method
ISO 527-3:1995 Plastics Determination of tensile properties Part 3: Test conditions for films and sheets
ISO 4592:1992 Plastics — Film and sheeting — Determination of length and width
ISO 6383-1:2015 Plastics Film and sheeting Determination of tear resistance Part 1: Trouser tear method
ISO 4593:1993 Plastics Film and sheeting Determination of thickness by mechanical scanning

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