GB/T 20186.1-2006 PDF in English
GB/T 20186.1-2006 (GB/T20186.1-2006, GBT 20186.1-2006, GBT20186.1-2006)
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Secondary coating materials used for optical fiber -- Part 1: Polybutylene terephthalate
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GB/T 20186.1-2006: PDF in English (GBT 20186.1-2006) GB/T 20186.1-2006
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 33.180.10
M 33
Secondary Coating Materials Used for Optical Fiber –
Part 1: Polybutylene Terephthalate
ISSUED ON: APRIL 05, 2006
IMPLEMENTED ON: OCTOBER 01, 2006
Issued by: General Administration of Quality Supervision, Inspection
and Quarantine
Standardization Administration of PRC.
Table of Contents
Foreword ... 4
1 Scope ... 5
2 Normative References ... 5
3 Requirements ... 6
4 Test Methods ... 7
5 Inspection Rules ... 10
6 Mark, Package, Transportation and Storage ... 12
Appendix A (Normative) Preparation of Standard Specimen for Secondary
Coating Materials ... 13
Appendix B (Normative) Test Methods of Moisture Content for Secondary
Coating Materials ... 15
Appendix C (Normative) Thermal Hydrolysis Property for Secondary Coating
Materials – Strength Test Methods ... 16
Appendix D (Normative) Compatibility of Secondary Coating Materials and the
Filling Ointment ... 18
Appendix E (Informative) Technical Requirements and Test Methods of PBT
Loose Tube ... 20
Appendix F (Informative) Preparation of Tubular Specimen for Loose Tube . 23
Appendix G (Informative) Sampling Method for the Tubular Specimen of
Loose Tube ... 25
Appendix H (Informative) Test Method for Mechanical Properties of Loose
Tube ... 26
Appendix J (Informative) Test Method for Axis Backward Shrinkage of Loose
Tube ... 28
Appendix K (Informative) Test Method for Thermal Hydrolysis of Loose Tube
... 29
Appendix L (Informative) Test Method for Thermal Aging Resistance of Loose
Tube ... 30
Appendix M (Informative) Test Method for Side Pressure Resistance of Loose
Tube ... 31
Appendix N (Informative) Test Method for Bending Resistance of Loose Tube
... 33
Appendix O (Informative) Compatibility between Filling Compound and Loose
Tube – Test Method for Winding Resistance ... 35
Foreword
GB/T 20186 Secondary Coating Materials Used for Optical Fiber includes the following
parts:
--- Part 1: Polybutylene Terephthalate;
--- Part 2: Modified Propylene Resin.
This Part is Part 1 of GB/T 20186. This Part was formulated by reference of the
following standards, such as American Society for Testing Materials Standard ASTM D
4507 Specification for Thermoplastic Polyester, IEC 60794-1-2:1999 Optical Fiber
Cables – Part 1-2: Generic Specification – Basic Optical Cable Test Procedures,
American Bellcore Communication Research Institute Standard: Specification for
Optical Fiber Loose Tube GR-20-CORE 6.3.4 Cable Material Compatibility (1998), ISO
relevant material standards, advanced standards of the international similar products,
and YD/T 769-2003 Central Beam Tube Type Fully Filled Outdoor Single-Mode Optical
Cable for Communication, etc.
This Part’s Appendixes A, B, C, D are normative.
This Part’s Appendixes E, F, G, H, J, K, L, M, N, O are informative.
This Part was proposed by Ministry of Information Industry of PRC.
This Part shall be under the jurisdiction of Ministry of Information Industry
(Communication).
Drafting organization of this Part: Wuhan Research Institute of Posts and
Telecommunications.
Chief drafting staffs of this Part: Hu Zhanhong, and Wei Zhongcheng.
Secondary Coating Materials Used for Optical Fiber –
Part 1: Polybutylene Terephthalate
1 Scope
This Part specifies the technical requirements, test methods, inspection rules, mark,
package, transportation and storage of polybutylene terephthalate of secondary
coating materials used for optical fiber.
This Part is applicable to the manufacture, use and acceptance of secondary coating
materials PBT used for optical fiber loose tube.
2 Normative References
The provisions in following documents become the provisions of this Part through
reference in this Part of GB/T 20186. For dated references, the subsequent
amendments (excluding corrigendum) or revisions do not apply to this Part, however,
parties who reach an agreement based on this Part are encouraged to study if the
latest versions of these documents are applicable. For undated references, the latest
edition of the referenced document applies.
GB/T 1033-1986 Test Method for Density and Relative Density of Plastics
GB/T 1034-1998 Plastics – Determination of Water Absorption (eqv ISO 62:1980)
GB/T 1036-1989 Determination for Coefficient of Linear Expansion of Plastics
GB/T 1040-1992 Plastics – Determination of Tensile Properties
GB/T 1410-1989 Methods of Test for Volume Resistivity and Surface Resistivity of
Solid Insulating Materials (eqv IEC 60093:1980)
GB/T 1634.1-2004 Plastics - Determination of Temperature of Deflection under
Load - Part 1: General Test Method
GB/T 1634.2-2004 Plastics - Determination of Temperature of Deflection under
Load - Part 2: Plastics, Ebonite and Long-Fiber-Reinforced Composites
GB/T 1843-1996 Plastics – Determination of Izod Impact Strength (eqv ISO 180-
1993)
GB/T 2828.1-2003 Sampling Procedures for Inspection by Attribute - Part1:
Sampling Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-Lot
Inspection (ISO 2859-1:1999, IDT)
GB/T 2829-2002 Sampling Procedures and Tables for Periodic Inspection by
Attributes (Apply to Inspection of Process Stability)
GB/T 2918-1998 Plastics – Standard Atmospheres for Conditioning and Testing
(idt ISO 291-1997)
GB/T 2951.1-1997 Common Test Methods for Insulating and Sheathing Materials
of Electric Cables - Part 1: Methods for General Application - Section One:
Measurement of Thickness and Overall Dimensions - Tests for Determining the
Mechanical Properties (idt IEC 60811-1-1:1993)
GB/T 2951.37-1994 Test Method for Determining Mechanical and Physical
Properties of Electric Cables and Wires - Test for Oxidative Inductive Time
GB/T 2411-1980 Plastics – Shore Hardness Test (eqv ISO 868:1978)
GB/T 3682-2000 Determination of the Melt Mass-Flow Rate (MFR) and the Melt
Volume-Flow Rate (MVR) of Thermoplastics (idt ISO 1133: 1997)
GB/T 9341-2000 Plastics – Determination of Flexural Properties (idt ISO 178:1993)
GB/T 17037.1-1997 Injection Molding of Test Specimens of Thermoplastic
Materials - Part 1: General Principles and Molding of Multipurpose and Bar Test
Specimens (idt ISO 294-1:1996)
ISO 1628-5:1986 (E) Plastics – Determination of the Viscosity of Polymers in
Dilute Solution Using Capillary Viscometers – Part 5: Thermoplastic polyester (TP)
Homopolymers and Copolymers
3 Requirements
3.1 Appearance
The product is the milky white, milky yellow or colorless transparent cylindrical particles
with diameter of 2mm~4mm, length of 2mm~4mm. The particles shall be smooth, free
of impurities and free of beads.
3.2 Physical and mechanical properties and electrical properties
The physical and mechanical properties and electrical properties of PBT materials shall
meet the requirements of Table 1.
Table 1 – Physical and Mechanical Properties and Electrical Properties of PBT
Materials
Table 1 – Continued
4 Test Methods
4.1 Appearance
Visually examination under natural light.
SN Names of items Units Indicators
Density
Melt index
Moisture content
Coefficient of water saturation
Yield strength
Yield elongation
Elongation at break
Tensile modulus of elasticity
Bending modulus of elasticity
Bending strength
Melting point
Shore hardness HD
Izod impact strength
Linear expansion factor (23°C~80°C)
Volume resistivity
Deflection temperature under load
Intrinsic viscosity
Thermal hydrolysis
Strength method
Yield strength
Elongation at break
Intrinsic viscosity
Compatibility between materials and
filling compounds
Strength method
Yield strength
Elongation at break
* is typical value of melting index. Supplier and purchaser of material can determine as per specific conditions of their own production and use
4.2 Specimen preparation
The specimen preparation required by each property in Table 1 shall, refer to the
method specified in GB/T 17037.1, specially performed according to the method
specified in Appendix A (normative).
4.3 Standard environment for conditioning and testing of plastic specimens
It shall be performed according to the Conditions 2, 3, 4 in GB/T 2918-1998.
4.4 Density
It shall be performed according to the method specified in GB/T 1033.
4.5 Melt index
It shall be performed according to the method specified in GB/T 3682-2000. The
specimen must be dried for 4h at 100°C.
4.6 Moisture content
It shall be performed according to the method specified in Appendix B (normative).
4.7 Coefficient of water saturation
It shall be performed according to the Method 1 specified in GB/T 1034-1998.
4.8 Tensile yield strength, tensile yield elongation, elongation at break, tensile
modulus of elasticity
4.8.1 It shall be performed according to the method specified in GB/T 1040. Adopt the
Type-I standard specimen.
4.8.2 The test speed for the following properties such as tensile yield strength, yield
elongation, elongation at break shall be 50mm/min; while the test speed for the tensile
modulus of elasticity shall be 5mm/min.
4.9 Bending strength, bending modulus of elasticity
It shall be performed according to the method specified in GB/T 9341. Adopt the
standard specimen of (80×10×4) mm3-type. The test speed shall be (2.0±0.4) mm/min.
4.10 Melting point
It shall be performed according to the method specified in GB/T 2951.37.
4.11 Shore hardness HD
It shall be performed according to the method specified in GB/T 2411.
4.12 Izod impact strength
4.12.1 It shall be performed according to the method specified in GB/T 1843. The
length and width of the standard specimen are 80mm and 10.2mm, respectively; the
height range is 4mm~10.2mm.
4.12.2 In the middle of the standard specimen in 4.12.1, a notch with (45±1) °, and a
curvature radius (R) of the bottom of (0.25±0.05) mm shall be machined; the remaining
part of the notch is (8±0.2) mm Type-A notch specimen. The notched Type-A standard
specimen can also be made from a single injection of the notched standard specimen
mold.
4.13 Linear expansion factor
It shall be performed according to the method specified in GB/T 1036.
4.14 Volume resistivity
It shall be performed according to the method specified in GB/T 1410. Take the
standard specimen with diameter of 100mm, thickness no greater than 2mm.
4.15 Deflection temperature under load
It shall be performed according to Method-A using bending stress of 1.80MPa, or
Method-B using bending stress of 0.45MPa specified in GB/T 1634. Take the standard
specimen of (80×10×4) mm3. The specimen in the test shall be placed horizontally.
4.16 Intrinsic viscosity
It shall be performed according to the method specified in ISO 1628-5-1986 (E). The
solution shall use the mixed solvents between 1,2 dichlorobenzene and phenol in a
ratio of 1:1.
4.17 Thermal hydrolysis property
The test method of thermal hydrolysis properties may be selected according to the
actual situation of the material supplier and purchaser.
4.17.1 Determination of strength
4.17.1.1 The specimen shall be the Type-I dumbbell standard specimen specified in
GB/T 1040, and prepared according to the Appendix A (Normative).
4.17.1.2 Test the strength of the specimen after thermal hydrolysis performance test in
accordance with the requirements in Appendix C (normative).
4.17.2 Determination of intrinsic viscosity
4.17.2.1 Take about 5g of PBT pellets; place them in a constant temperature and
humidity box with temperature controlled at (85±1) °C, humidity controlled at (85±5) %
for 30 days; take them out and adjust for 24h at the 23°C environment.
4.17.2.2 Determine the viscosity of the materials according to the method specified in
4.16.
4.18 Compatibility between material and filling ointment
4.18.1 The specimen shall be the Type-I dumbbell standard specimen specified in
GB/T 1040, and prepared according to the Appendix A (Normative).
4.18.2 Follow the method specified in Appendix D (normative) to test the compatibility
of materials.
5 Inspection Rules
Inspection can be divided into exit-factory inspection, type inspection, and user
acceptance inspection.
5.1 Exit-factory inspection
5.1.1 The exit-factory inspection shall perform the sampling inspection according to
GB/T 2828.1. This Part specifies that the products produced in the same time section,
by the same raw materials, and the same process are one batch. When the yield is
large, the quantity of each batch must not exceed 50t.
5.1.2 Each batch of PBT products shall be inspected by the quality inspection
department of the material manufacturer. The product can only leave the factory after
passing the inspection. The exit-factory products shall be accompanied by a quality
inspection certificate.
5.1.3 According to the requirements of Clause 3, the inspection items in 3.1 and 3.2
Table 1 are the exit-factory inspection items.
5.1.4 If the exit-factory inspection is unqualified, then the products shall be unqualified.
If product properties do not meet the requirements in 3.1 and 3.2 Table 1, then it is said
that the exit-factory inspection is unqualified.
If there are one or more unqualified unit products, then they are called unqualified
products.
5.2 Type inspection
5.2.1 Type inspection shall be carried out according to the provisions of GB/T 2829.
Random sampling inspection shall be taken from one batch or several batches that
pass the exit-factory inspection to judge whether the stability and reliability of the
products during the producing period meet the requirements of this Part.
5.2.2 Type inspection shall be performed at least once every 6 months. All items in 3.1
and 3.2 Table 1 shall be inspected.
5.2.3 Type inspection shall be carried out in one of the following situations:
a) When products are performing stereotyping appraisement;
b) When the changes in raw materials, processes, and equipment may influence
the product performances after the formal production;
c) When production is restored after long-term shut-down;
d) When there is a big difference between the exit-factory inspection results and the
previous type inspection results;
e) When the State Technical Supervision Bureau proposes to carry out the type
inspection.
5.2.4 Qualified and unqualified type inspection
a) Qualified inspection:
If product properties meet the requirements of each property in 3.1 and 3.2 Table
1, then the type inspection is qualified.
b) Unqualified inspection
If there are one or more unqualified unit products, then the type inspection is
called unqualified.
5.2.5 Treatment of unqualified type inspection
If the type inspection is unqualified, t hen the material manufacturer shall immediately
stop the exit-factory inspection. Immediately analyse the cause, take measures and
eliminate the unqualified factors till the new type inspection is qualified, can the exit-
factory inspection be restored.
5.3 User acceptance inspection
5.3.1 The user acceptance inspection shall examine all the items in 3.1 and 3.2 Table
1 of Clause 3.
5.3.2 For products that have been ordered for delivery, the manufacturer shall, in
principle, allow returns as long as one item is found not to meet the requirements of
3.1 and 3.2 Table 1 in Clause 3. However, it shall, under the supervision of the
industry’s authoritative quality inspection agency, jointly form an inspection group by
the supplier and the purchaser to reinspect, or reinspect by the industry’s authoritative
quality inspection agency. In principle, the re-inspection is only against the unqualified
items.
6 Mark, Package, Transportation and Storage
6.1 Mark
6.1.1 The packaging bag of the products that inspected qualified shall be indicated the
name of the materials, code, trademark, designation, batch number (or date of
production), standard number, quality, manufacturer (including address, telephone,
post code); and have the marks for “heat-proof” and “moisture-proof”.
6.1.2 Each batch of products delivered shall have product inspection report sheet and
certificate of conformity.
6.2 Package
The product is applied with negative pressure packaging with inner packaging of
composite metal film and outer packaging bag with moisture-proof composite paper;
or negative pressure packaging with packaging bags negotiated between the supplier
and the purchaser. The net mass per bag is 25kg or the mass that is recognized by
both the supplier and the purchaser.
6.3 Transportation
When transporting the products, do not expose them to the sun and rain; and keep
them dry, clean, intact and pollution-free.
6.4 Storage
The products shall be stored in a clean, dry, cool and ventilated warehouse. The
storage period shall be one year since the date of production.
Appendix A
(Normative)
Preparation of Standard Specimen for Secondary Coating
Materials
A.1 Applicable scope
This method is applicable to the preparation of standard specimens required for the
material property test in Table 1.
A.2 Method summary
Specimens shall be prepared by one-step injection molding method.
A.3 Devices
A.3.1 Injection molding machine: screw injection molding machine or plunger injection
molding machine.
A.3.2 Mold: according to the mold of standard specimen required for various properties
in standards of the normative references.
A.4 Injection molding condition
A.4.1 Material temperature: the temperature shall be gradually raised according to the
melting state of the materials. The temperature distribution of the barrel is
(220~240) °C, (220~240) °C, (210~230) °C.
A.4.2 Mouth mold temperature (°C) for the material injection: 220~240.
A.4.3 Mold temperature (°C): 50~60.
A.4.4 Injection molding time (s): 7.
A.4.5 Dwell time (s): 15.
A.4.6 Injection molding pressure (MPa): 7±1.
A.4.7 Mold opening time (s): 12.
A.4.8 Cooling speed: after the injection of each specimen, take out the mold and
cooled it off naturally at 23°C environment.
A.4.9 Injection molding cycle (s): 40 (except the equipment pre-heat time).
A.4.10 The maximum injection molding quantity is 50% of the rated capacity of the
equipment.
A.5 Injection molding procedures
A.5.1 Place about 2kg of granular specimen into an oven at (100±1) °C to dry it for at
least 8h.
A.5.2 Raise the temperature of the injection molding machine barrel step by step.
A.5.3 Add 2kg of materials to the hopper of the screw injection molding machine or the
hopper of the plunger injection molding machine.
A.5.4 Allow the injection molding machine to inject freely; according to the molten state
of the materials that are freely injection into a suitable container, adjust the temperature
of the various levels of barrels and the temperature of mouth mold.
A.5.5 Mold-closing injection, inject materials into the standard mold, which shall be
finished in 7s.
A.5.6 Pressurizing to ensure that the pressure of the materials in the injection barrel is
constant at (7±1) MPa; maintain for 15s.
A.5.7 Mold-opening, take out the standard specimen from the mold and cooled it off
naturally at 23°C environment; after 12s, repeat the procedures of A.5.5.
Appendix B
(Normative)
Test Methods of Moisture Content for Secondary Coating Materials
B.1 Test devices
B.1.1 Weighing dish.
B.1.2 Air circulation test box, the temperature control accuracy is ±1°C.
B.1.3 Analytical balance with an accuracy of ±0.1mg.
B.1.4 Dryer.
B.2 Test procedures
B.2.1 The weight dish is dried at 100°C; take it out and place into a dryer to cool off to
the room temperature; and make its constant weight; then record the mass to be W0,
accurate to ±0.1mg.
B.2.2 Take about 10g of specimen from the original packaging bag and place it into
the weighing dish with constant weight to weigh; record the mass to be W1, accurate
to ±0.1mg. This process shall be finished within 10min.
B.2.3 Place the specimen into 100°C air-circulation test box for 4h; take out the
specimen and place into the dryer to cool off to the room temperature; immediately
weigh it; record the mass to be W2, accurate to 0.1mg.
B.3 Calculation of results
Calculate the test results according to the following formula:
B.4 Record
Record the test results.
Appendix C
(Normative)
Thermal Hydrolysis Property for Secondary Coating Materials –
Strength Test Methods
C.1 Test devices
C.1.1 Temperature and humidity test box: temperature-controlled accuracy is ±1°C;
humidity-controlled accuracy is ±5%.
C.1.2 Electronic tensile machine: accuracy is 1%.
C.2 Test conditions
C.2.1 Temperature: (85±1) °C.
C.2.2 Humidity: (85±5) %.
C.2.3 Time: 20×24h.
C.3 Test procedures
C.3.1 Take out 5 Type-I standard dumbbell specimens specified in accordance with
GB/T 1040 and prepared according to Appendix A.
C.3.2 Place the sample into the temperature humidity test box. The sample shall be
hung vertically in the test box to ensure that all sides of the sample can be exposed to
the standard test environment.
C.3.3 Adjust the temperature and humidity to the environment specified in C.2.1 and
C.2.2; then start counting.
C.3.4 The specimen shall be maintained for 20×24h under the condition of C.3.3.
C.3.5 Take out the specimen. Place the specimen in the dryer under the room
temperature and adjust for 24h.
C.3.6 Test the tensile properties of the specimen according to the method specified in
GB/T 1040. Test speed is 50mm/min.
C.4 Results and record
C.4.1 Calculate the yield strength and elongation at break of the materials after the
hydrolysis resistance test according to the method specified in GB/T 1040.
C.4.2 Record the inspection results.
Appendix D
(Normative)
Compatibility of Secondary Coating Materials and the Filling
Ointment
D.1 Test devices
D.1.1 Air circulation test box: temperature-controlled accuracy is ±1°C.
D.1.2 Electronic tensile testing machine: the accuracy is 1%.
D.1.3 Container filled with optical fiber ointment.
D.1.4 Paper towels for cleaning.
D.2 Test conditions
D.2.1 Temperature: (85±1) °C.
D.2.2 Time: 45×24h.
D.3 Test procedures
D.3.1 Take out 5 Type-I standard dumbbell specimens specified in accordance with
GB/T 1040 and prepared according to Appendix A.
D.3.2 Place the specimen into a container filled with ointment.
D.3.3 Place the container in an air circulation test box whose temperature is controlled
at (85±1) °C.
D.3.4 Under the condition of (85±1) °C, maintain for 45×24h.
D.3.5 Take out the specimen after the completion of the aging time; use the paper
towel to gently wipe the ointment; cool off to the room temperature.
D.3.6 After 24h, according to the method specified in GB/T 1040; the gauge length is
50mm; tensile the specimen at the test speed of 50mm/min.
D.4 Calculation of results
D.4.1 Calculate the yield strength and elongation at break of the specimen according
to the method specified in GB/T 1040.
D.4.2 Take the arithmetic mean of the 5 specimens as the test results of the specimen.
D.5 Record
Record the test results.
Appendix E
(Informative)
Technical Requirements and Test Methods of PBT Loose Tube
E.1 Scope
This section specifies, after the secondary coating material PBT for optical fibre is
extruded into a loose tube, the technical requirements and test methods of the loose
tube.
E.2 Informative References
The provisions in following documents become the provisions of this Appendix through
reference in this Appendix. For dated references, the subsequent amendments
(excluding corrigendum) or revisions do not apply to this Appendix, however, parties
who reach an agreement based on this Appendix are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
IEC 60794-1-2 34 Method G7: Tube Kinking
American Bellcore Communication Research Institute Standard: Specification for
Optical Fiber Loose Tube GR-20-CORE 6.3.4 Cable Material Compatibility (1998)
E.3 Requirements
After the PBT secondary coating material is extruded into the loose tube, its physical
and mechanical properties shall meet the requirements of Table E.1.
Table E.1 – Physical and Mechanical Properties of PBT Loose Tube
E.4 Test methods
E.4.1 Mechanical properties of loose tube
E.4.1.1 The tubular specimen for the secondary coating material shall be prepared
according to the method specified in Appendix F (informative). It can also be performed
according to the material user’s actual preparation method of the loose tube.
E.4.1.2 The sampling method for the tubular specimen of the secondary coating
material shall be performed according to the method specified in Appendix G
(informative).
E.4.1.3 The mechanical properties of loose tube shall be performed according to the
method specified in Appendix H (informative). The specimen is the same as E.4.1.1.
The sampling method is the same as E.4.1.2.
E.4.2 Axis backward shrinkage of loose tube
It shall be performed according to the method specified in Appendix J (informative).
The specimen is the same as E.4.1.1. The sampling method is the same as E.4.1.2.
E.4.3 Thermal hydrolysis of loose tube
It shall be performed according to the method specified in Appendix K (informative).
The specimen is the same as E.4.1.1. The sampling method is the same as E.4.1.2.
E.4.4 Thermal aging resistance of loose tube
SN Names of items Units Indicators
Mechanical properties of loose tube
Yield strength
Yield elongation
Elongation at break
Axis of the loose tube is shrunk backward
Thermal hydrolysis of loose tube
Yield strength
Elongation at break
Thermal aging resistance of loose tube
Side pressure resistance of loose tube
Bending resistance of loose tube
Compatibility between loose tube and filling compound
1. Winding resistance
2. Strength method
Yield strength
Elongation at break
No cracks or breaks
No cracks or breaks
No blushing or cracks
It shall be performed according to the method specified in Appendix L (informative).
The specimen is the same as E.4.1.1. The sampling method is the same as E.4.1.2.
E.4.5 Side pressure resistance of loose tube
It shall be performed according to the method specified in Appendix M (informative).
The outer diameter of the specimen Φ (3.0±0.2) mm, wall thickness (0.5±0.1) mm. The
sampling method is the same as E.4.1.2.
E.4.6 Bending resistance of loose tube
Refer to the Method IEC 60794-1-2-G7 specified in IEC 60794-1-2; it shall be specially
performed according to the method specified in Appendix N (informative). The
specimen is the same as E.4.1.1. The sampling method is the same as E.4.1.2.
E.4.7 Compatibility between loose tube and filling ointment
E.4.7.1 Winding resistance
The winding resistance method shall be performed according to the method specified
in Appendix O (informative). The specimen is the same as E.4.1.1. The sampling
method is the same as E.4.1.2.
E.4.7.2 Strength method
E.4.7.2.1 The specimen for strength method is the same......
......
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