ISO/FDIS 25160

ISO/TC 17/SC 17
Secretariat: SAC
Date: 2026-06-3008-21
Testing method for hose reinforcement wire
Méthode d'essai pour le fil de renforcement des tuyaux
FDIS stage
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Contents
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Diameter . 2
4.1 Measuring with a micrometer . 2
4.2 Measuring with non-contact methods — Laser . 5
5 Breaking force and yield force and elongation . 5
5.1 Principle . 5
5.2 Apparatus . 7
5.3 Test procedure . 8
6 Knot strength . 9
6.1 Principle . 9
6.2 Apparatus . 9
6.3 Test procedure . 9
7 Torsion resistance . 10
7.1 Principle . 10
7.2 Symbols . 10
7.3 Apparatus . 11
7.4 Test procedures . 11
8 Reverse bending or flexions . 12
8.1 Principle . 12
8.2 Apparatus . 13
8.3 Procedure . 16
9 Cast and dead cast . 17
9.1 Principle . 17
9.2 Apparatus . 17
9.3 Procedure . 17
10 Determination of mass and composition of coating . 18
10.1 Determination of mass and composition of coating by X-ray fluorescent spectrometers . 18
10.2 Determination of mass and composition of coating by atomic absorption spectrometry . 20

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Foreword
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and wire products.
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Testing method for hose reinforcement wire
1 Scope
This document specifies test methods of round steel hose reinforcement wire which are used for hose
reinforcement. Test methods on mechanical properties and chemical properties (coating analysis) are
included.
By agreement, these test methods maycan be applied to similar single filaments used for reinforcement of
other rubber products.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 7800:2012, Metallic materials — Wire — Simple torsion test
ISO 23717, Steel wire and wire products — Hose reinforcement wire
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 23717 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/
3.1 3.1
breaking force
force level (BL) at fracture, expressed in N
3.2 3.2
maximum force
F
m
highest force the test piece withstands, expressed in N
3.3 3.3
elongation
percent total elongation at break (A ) is the extension at break divided by the original specimen length
t
times 100
3.4 3.4
yield force
force level at 0,2 % permanent elongation offset, expressed in N
4 Diameter
4.1 Measuring with a micrometer
4.1.1 Principle
Hold a wire sample between two parallel circulars faced spindles of a micrometer. Close the movable spindle
gradually with controlled speed until it is in contact with the specimen. Read the value on the micrometer.
4.1.2 Apparatus
4.1.2.1 Micrometer
a) a) A precision cylindrical outside micrometer with non-rotating spindle type (see
Figure 1Figure 1).).
b) b) In a laboratory setting, a digital precision micrometer with resolution of 0,001 mm shall be
used.
c) c) Circular spindle Φ6,35 mm
d) d) Measuring range is from 0 mm to 25 mm.
e) e) Measuring force range: < 10 N.

Figure 1 — Cylindrical outside micrometer
4.1.3 Test procedure
4.1.3.1 Sample preparation
a) a) Cut a sample at length (about 10 cm to 15 cm).
b) b) A right-angle bend in the wire is to be applied to assist in rotating the wire between
measurements.
c) c) The measured area of the wire shall be as straight as possible.
d) d) The wire surface shall be clean. Dirt and lubricant residues shall be removed with a clean tissue.
4.1.3.2 Zero-setting of the micrometer
a) a) Verify if the ‘display and nonius’ for digital micrometers and ‘nonius’ for analogue micrometers
show 0,000 mm when the anvils are closed in a controlled way with 3 friction clicks.
b) b) When ‘reset action’ is needed; always first clean the anvil surface of the micrometer with clean
paper before the reset button is used.
c) c) This ‘zero-setting’ procedure needs to be done before each test series.
4.1.3.3 Methods of measuring
a) a) Method 1: Cylindrical outside micrometer: open and close method (see Figure 2Figure 2).).

Key
d1 the first reading, expressed in millimetres (mm)
d is the second reading, expressed in millimetres (mm)
d is the third reading, expressed in millimetres (mm)
da is the maximum diameter, expressed in millimetres (mm)
db is the minimum diameter, expressed in millimetres (mm)
Figure 2 — Diameter test diagrams
1) 1) The movable anvil is closed until it is in contact with the specimen. The closing speed shall be
controlled until 3 clicks heard. The closing speed shall be controlled to avoid too high closing pressure
and pressure overshoots.
2) 2) Measure value 1 and record as d1.
3) 3) Measure value 2 at 60°+/-° ± 10° rotation of the wire and record as d .
4) 4) Measure value 3 at another 60°+/-° ± 10° rotating of the wire and record as d .
NOTE 1 Avoid measuring every 90° because after 2 rotations one is measuring at same angle again.
NOTE 2 When measuring method ‘out of roundness’ (ovality) is required.
5) 5) Axially rotate the specimen between successive measurements to find maximum and minimum
diameter.
6) b) Method 2: Cylindrical outside micrometer: rotating method (see Figure 2Figure 2).).
1) 1) The movable anvil is closed until it is in contact with the specimen and stay closed under a
manually applied stable closing force.
2) 2) The sample is manually rotated 360° while the anvils are still in close position.
3) 3) Maximum and minimum diameter is noted.
4) 4) Average diameter is calculated out of Max and Min.
4.1.3.4 Calculations and report
4.1.3.4.1 Method when no ovality or out of roundness is required
Determine the wire diameter by calculating the arithmetic mean of minimum 3 readings with
Formula (1)Formula (1).
d = ( d + d + d )/3 (1)
0 1 2 3
where
d is wire diameter
st
d is the 1 reading
nd
d is the 2 reading
rd
d is the 3 reading
d is the wire diameter;
st
d is the 1 reading;
nd
d2 is the 2 reading;
rd
d is the 3 reading.
4.1.3.4.2 Method when ovality or out of roundness is required
Determine the ‘Ovality’ by calculating the difference of the two readings with Formula (2)Formula (2):
Ov= da-db (2)
where
d = (d + d )/2 (3)
0 a b
da is the maximum diameter, expressed in millimetres (mm));
db is the minimum diameter, expressed in millimetres (mm));
d is the average diameter, expressed in millimetres (mm)).
4.2 Measuring with non-contact methods –— Laser
a) a) Resolution of 0,001 mm is minimum requirement.
b) b) Sample surface needs to be cleaned prior to test.
c) c) Sample needs to be perfect perpendicular positioned towards the laser beam.
d) d) Sample needs to be rotatable during testing having multiple measurements to calculate
average diameter or non-contact measuring devices shall be able to test in multiple angles (min 4) to take
average diameter.
5 Breaking force and yield force and elongation
5.1 Principle
This test method covers the measurement of breaking force, yield force, and elongation of single filament steel
reinforcement wire in a tensile test. Both ends of a test sample are clamped under a defined pretension in a
tensile testing machine; increasing load under a constant rate of extension is applied until the specimen
breaks. The change in force is measured versus the increase in separation of the specimen clamps to form a
force-extension curve. Breaking force (load) and maximum force and percent elongation at break and yield
force are measured or calculated (see Figure 3Figure 3).).
Key
F force
ep specified percentage plastic extension
0 zero point
mE slope of the elastic part of the stress-percentage extension curve
e percentage extension a fracture
F maximum force
m
At percentage total extension at fracture
Figure 3 — Tensile force - elongation curve
5.2 Apparatus
5.2.1 Tensile testing machine
a) a) Constant-Rate-of-Extension (CRE) tensile testing machine, its capacity shall ensure that the
measured force required to fracture the wire is within the calibrated range of the loadcell.
b) b) The capability of cross-head speed: ≥ 150 mm/min.
c) c) Machine accuracy Class 0,5 = Load weighing accuracy: +/-± 0,5 %
d) d) Load cell capacity depends on type and characteristics of the tested wire.
e) e) The structure of the machine and gripping systems shall be able to handle the axial force.
5.2.2 Grips
Grip types shall be selected according to the wire dimensions and wire characteristics and within the range of
the load cell. They can be wedge grips type, action screw type, or pneumatic action type with suitable jaw faces
(for example: smooth and ceramic or serrated jaw faces) to avoid failure of specimen at gripping point and
avoid slippage of specimen within the jaws.
5.2.3 Extensometer
a) a) Contact or no-contact extensometer.
b) b) Resolution of 0,001 % of the gauge length.
c) c) Standard clamp to clamp distance is 250 mm or 500 mm
Standard extensometer is 200 mm.
d) d) Extensometer accuracy Class 05.
— — Contact extensometer with sensor and contact arms
— — Non-contact extensometer
e) e) Video extensometer
f) f) Laser extensometer
g) g) Light extensometer
5.2.4 Oven
a) a) An oven is required only when testing at elevated temperature is specified.
b) b) The oven shall have a temperature capacity of at least 200 °C.
c) c) An oven with a built-in timer is recommended.
5.3 Test procedure
5.3.1 Sample preparation
a) a) Sample taking process shall avoid any undulations, loops, bends or damage of the wire and
wire surface.
b) b) Cut a piece of wire of the used test length plus twice the length of a jaw face.
c) c) When slippage occurs in the clamps, a new sample specimen shall be taken to retest.
d) d) When requested the wire can be thermally aged in an oven. Aging time and aging temperature
as agreed with requester. Standard aging conditions are: 60 min ± 1 min, at 150 °C ± 3 °C.
5.3.2 Test settings
a) Test length:
— — Standard gauge length Lo: = 500 mm
— — Standard extensometer gauge Le: = 200 mm
— — The gauge length Lo and Le can be adjusted according to the requester.
b) b) Speed:
— — Preload speed: 5 mm/min to 15 mm/min
— — Test speed @at 500 mm: 100 mm/min
— — Test speed @at 250 mm: 25 mm/min
— — Test speed with extensometer: 20 to 60 mm/min
c) c) Preload:
3 N for wires ≤ 0,50 mm
5 N or 10 N for wires > 0,50 mm;
d) d) The preload can be adjusted the wire is not taut at preload level.
— — General rule: The preload shall be as low as possible, but the wire shall be taut status between the
clamps, not slack.
e) e) The number of datapoints to construct the curve shall be at least 15001 500 datapoints.
5.3.3 Test process
a) a) Test carried out under controlled conditions shall be made at a temperature of 23 °C +/-± 5 °C.
b) b) Secure the specimen in the centre of the top clamp. Load the other end in the bottom clamp.
c) c) Manually apply a pretension just below the applied pre-load to take out any residual curvature
before initiating the test.
d) d) Start the machine and record force and extension of curve generated.
e) e) Run until specimen breaks.
f) f) When fracture location is closer than 3 mm from the grips then test cannot be validated.
g) g) Test is to discard, and new sample specimen is to test.
h) h) If these fractures close to clamps frequently occurs:
— — reduce clamping force but avoid slippage out of the clamps.
— — choose different jaw faces (for example: smooth and ceramic and light serrated jaw faces)
5.3.4 Calculation
Calculation of test parameters is done
...