ASTM F2819-10(2015)e2

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Designation: F2819 −10 (Reapproved 2015)
Standard Test Methods for
Measurement of Straightness of Bar, Rod, Tubing and Wire
to be used for Medical Devices
This standard is issued under the fixed designation F2819; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
ε NOTE—Editorial corrections were made in June 2016.
ε NOTE—Subsection 11.1.3 was corrected editorially in September 2017.
1. Scope It also applies to flatness (camber) of flat and shaped bar with
a maximum dimension between 6.35 and 101.6 mm (0.25 and
1.1 This standard covers the various test methods to be used
4 in). For measurement of flatness (camber), refer to Test
for measurement of straightness of bar, rod, tubing, and wire.
Method F2754/F2754M.
Thesetestmethodsapplyprimarilytobar,rod,tubing,andwire
that are ordered in the straightened and cut-to-length condition.
NOTE 3—The current version of Test Method F2754/F2754M covers a
different diameter range (0.0127 to 4.78 mm (0.0005 to 0.188 in.)) and
They also apply to small diameter tubing and wire that has
does not include superelastic NiTi. These exceptions would not affect the
been specially processed to roll off a spool in the straightened
camber measurement as conducted by Test Method F2754/F2754M.
condition.
1.6 These test methods apply to ferrous and non-ferrous
1.2 These test methods apply to straightness of round wire
alloys including linear-elastic or superelastic nitinol. Refer to
that has a diameter between 0.05 and 4.78 mm (0.002 and
Terminology F2005 for more details on NiTi terminology.
0.188 in.). They also apply to flatness (camber) of flat-shaped
1.7 The values stated in either SI units or inch-pound units
wire or ribbon with a maximum dimension between 0.05 and
are to be regarded separately as standard. The values stated in
4.78 mm (0.002 and 0.188 in.). For flatness (camber)
each system may not be exact equivalents; therefore, each
measurement, refer to Test Method F2754/F2754M.
system shall be used independently of the other. Combining
NOTE 1—The current version of Test Method F2754/F2754M covers a
different diameter range (0.0127 to 4.78 mm (0.0005 to 0.188 in.)) and
values from the two systems may result in non-conformance
does not include superelastic NiTi. These exceptions would not affect the
with the standard.
camber measurement as conducted by Test Method F2754/F2754M.
1.8 This standard does not purport to address all of the
1.3 These test methods apply to straightness of round tubing
safety concerns, if any, associated with its use. It is the
that has an outer diameter between 0.05 and 6.35 mm (0.002
responsibility of the user of this standard to establish appro-
and 0.25 in.).
priate safety, health, and environmental practices and deter-
1.4 These test methods apply to straightness of round rod
mine the applicability of regulatory limitations prior to use.
that has a diameter between 4.78 and 6.35 mm (0.188 and 0.25
1.9 This international standard was developed in accor-
in). It also applies to flatness (camber) of flat and shaped rod
dance with internationally recognized principles on standard-
with a maximum dimension between 4.78 and 6.35 mm (0.188
ization established in the Decision on Principles for the
and 0.25 in). For measurement of flatness (camber), refer to
Development of International Standards, Guides and Recom-
Test Method F2754/F2754M.
mendations issued by the World Trade Organization Technical
NOTE 2—The current version of Test Method F2754/F2754M covers a
Barriers to Trade (TBT) Committee.
different diameter range (0.0127 to 4.78 mm (0.0005 to 0.188 in.)) and
does not include superelastic NiTi. These exceptions would not affect the
2. Referenced Documents
camber measurement as conducted by Test Method F2754/F2754M.
2.1 ASTM Standards:
1.5 These test methods apply to straightness of round bar
F2005 Terminology for Nickel-Titanium Shape Memory
thathasadiameterbetween6.35and101.6mm(0.25and4in).
Alloys
F2754/F2754M Test Method for Measurement of Camber,
These test methods are under the jurisdiction of ASTM Committee F04 on
Medical and Surgical Materials and Devices and is the direct responsibility of
Subcommittee F04.15 on Material Test Methods. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
CurrenteditionapprovedMay1,2015.PublishedJuly2015.Originallyapproved contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
in 2010. Last previous edition approved in 2010 as F2819 – 10. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
F2819-10R15E02. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F2819 − 10 (2015)
Cast, Helix and Direction of Helix of Coiled Wire card is used to rotate the center of the sample back and forth on
2.2 Other Standards: the flat surface. The opposite ends of the sample should rotate
smoothly without wobble as is defined in 3.2.2 of these test
GGG-P-463 U.S. Federal Specification: Plate, Surface
(Granite) methods.
4.4 Gap Test (quantitative test method)—A common quan-
3. Terminology
titative method for measurement of straightness of wire with a
3.1 Fig. 1 and Fig. 2 show the physical meaning of
diameter less than 4.78 mm (0.188 in.) is the gap test. It can
straightness. Fig. 3 shows the definition of wobble in a straight
alsobeusedforrodwithadiameterbetween4.78and6.35mm
wire or tube as it is being rotated.
(0.188 and 0.25 in.), tubing with diameter 0.05 to 6.35 mm
(0.0002 to 0.25 in.) or bar with a diameter between 6.35 to
3.2 Definitions of Terms Specific to This Standard:
101.7 mm (0.25 to 4 in.), the gap test can be used to measure
3.2.1 straightness—Deviation of an axis or surface element
straightness. The gap test can also be used for flat or shaped
from linearity over a unit length in the unloaded (force and
wire and ribbon. In this method, a thickness gauge equal to the
momentfree)condition.Aperfectlystraightconditionisshown
gap must not fit between the rod, tubing, or bar and flat surface
in Fig. 1. A non-straight condition is shown in Fig. 2.
at any point along its length when rolled or rotated 360°. The
3.2.2 wobble—Elliptical rotation observed in a small diam-
gap defines the straightness of the rod, tubing, or bar.
eter wire or tube as it is being rotated around a central axis as
is shown in Fig. 3. 4.5 Total Indicator Readout (TIR) test (quantitative test
method)—In this method, a round rod with a diameter between
4. Summary of Test Method
4.78 and 6.35 mm (0.188 and 0.25 in.) or round bar with a
diameterbetween6.35to101.7mm(0.25to4in.),isplacedon
4.1 For bar, rod, tube, and wire, the deviation from the
two or more V-blocks. The test specimen is then rotated one
condition of resting flat on a smooth surface can be measured
revolution between two or more V-blocks that are a fixed
by using a quantitative or qualitative test method. Two quan-
distance (d) apart while measuring in the center with an
titative and two qualitative methods are the gap and TIR (Total
indicator. Total Indicator Readout (TIR) in the test specimen is
Indicator Readout) and inclined flat plate and finger roll tests,
then calculated.
respectively
4.2 Inclined Flat Plate Test (qualitative test method that can
5. Significance and Use
be made quantitative)—Acommonmethodformeasurementof
5.1 Significance—With the birth of minimally invasive sur-
straightness of wire or tubing with a diameter less than 4.78
geryinthe1960s,therehasbeenarequirementforguidewires.
mm (0.188 in.) is the inclined flat plate test. In this method, a
The guide wires serve as the access line by which procedures
sectioned piece of material is allowed to roll down an inclined
like balloon angioplasty and stent placement are conducted. A
table as is illustrated by Fig. 4 and Fig. 5. The material passes
guide wire typically consists of a mandrel, coil and in some
the test if it rolls freely down the table without stopping as is
cases a safety wire is used. The market for guide wires
shown by Fig. 5.
continues to grow as the number of procedures increases. For
4.3 Finger-Roll Test (qualitative test method)—A second
successful manufacturing of guide wires, linearity or straight-
common method for measurement of straightness that is used
ness of 304 stainless steel and nitinol wire that is used for the
for wire and tubing with a diameter less than 0.25 mm (0.010
manufacture of guide wire mandrels is critical to their end use
in.) is the finger-roll test. In this test, a cut length of wire or
performance. Users of guide wires require that they must
tubing is laid on a flat surface. A finger, pencil, pen, or plastic
navigate a tortuous anatomy.
5.1.1 Asecond part of minimally invasive surgery is the use
of machined or formed wire, tube, or rod. In this case,
Available from IHS, 321 Inverness Drive South Englewood, CO 80112,
straightness of rod, tube, and wire that is going to be machined
http://www.global.ihs.com.
FIG. 1 Definition of a “Straight” Condition
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F2819 − 10 (2015)
FIG. 2 Definition of a “Non-straight” Condition
FIG. 3 Definition of Wobble in a Small Diameter Tube or Wire as it is Being Rotated
FIG. 4 Example of a Table and Granite Parallel Used to Measure Straightness by the Roll Test
FIG. 5 Example of Inclined Surface Table and Protractor Used to Measure Straightness by the Roll Test Method
or subjected to a forming practice such as bending needs to be material. Depending upon the type of material and its metal-
very linear or straight so it is accurately fed into the equipment lurgical condition, it may be possible to reprocess the material
that is used for the machining or forming practice. Laser to reduce its non-linearity.
machiningisanexampleofamachiningoperationthatrequires
a wobble-free piece of rod, tubing, or wire so that it can be 6. Apparatus
properly fed into the alignment bushings of the laser. Wire
6.1 For the inclined flat plate test, a flat table preferably
forming equipment also requires wobble-free material for the
made of granite that can be precisely inclined is required. The
same reason.
flat table should have an inspection grade; grade A, flatness as
5.2 Use—These test methods can be used by users and set forth by Federal Specification GGG-P-463. A precise
producersofmedicalgradebar,rod,tubing,andwiretospecify measurement device and a prot
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