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ASTM D4166-99

(Test Method)

Standard Test Method for Measurement of Thickness of Nonmagnetic Materials by Means of a Digital Magnetic Intensity Instrument

Standard Test Method for Measurement of Thickness of Nonmagnetic Materials by Means of a Digital Magnetic Intensity Instrument

SCOPE
1.1 This test method covers the measurement of thickness of any nonmagnetic material by means of a digital magnetic intensity instrument.  
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
09-Jul-1999
ICS
17.040.20 - Properties of surfaces
Technical Committee
D20 - Plastics
Drafting Committee
D20.23 - Reinforced Thermosetting Resin Piping Systems and Chemical Equipment
Current Stage
Ref Project

Relations

Replaced By
ASTM D4166-99(2004)e1 - Standard Test Method for Measurement of Thickness of Nonmagnetic Materials by Means of a Digital Magnetic Intensity Instrument (Withdrwan 2008)
Effective Date
01-Oct-2004
Referred By
ASTM D3567-17(2022) - Standard Practice for Determining Dimensions of “Fiberglass” (Glass-Fiber-Reinforced Thermosetting Resin) Pipe and Fittings
Effective Date
10-Jul-1999

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ASTM D4166-99 - Standard Test Method for Measurement of Thickness of Nonmagnetic Materials by Means of a Digital Magnetic Intensity InstrumentASTM D4166-99 - Standard Test Method for Measurement of Thickness of Nonmagnetic Materials by Means of a Digital Magnetic Intensity Instrument
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ASTM D4166-99 - Standard Test Method for Measurement of Thickness of Nonmagnetic Materials by Means of a Digital Magnetic Intensity Instrument
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
An American National Standard
Designation: D 4166 – 99
Standard Test Method for
Measurement of Thickness of Nonmagnetic Materials by
Means of a Digital Magnetic Intensity Instrument
This standard is issued under the fixed designation D 4166; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope * 4. Interferences
1.1 This test method covers the measurement of thickness of 4.1 Any instrument measuring the intensity of a magnetic
any nonmagnetic material by means of a digital magnetic field can sometimes be influenced by a strong artificial or
intensity instrument. natural magnetic field.
1.2 This standard does not purport to address all of the 4.2 Any magnetic material located in the space between the
safety concerns, if any, associated with its use. It is the magnet and the sensor will distort the measurement.
responsibility of the user of this standard to establish appro- 4.3 A major temperature change (+10°F, +5.6°C) will cause
priate safety and health practices and determine the applica- a slight drift in calibration, requiring a recalibration at the new
bility of regulatory limitations prior to use. temperature prior to making the measurement.
1.3 There is no similar or equivalent ISO standard.
5. Apparatus
2. Summary of Test Method
5.1 Micro Digital Magnetic Thickness Sensor.
2.1 In this test method, a magnetic sensing device is
6. Sampling
calibrated and placed on one side of the material to be
measured. A magnet of known intensity is placed on the 6.1 Two separate measurements at each location shall be
taken. If a variation in excess of 0.01 in. (0.25 mm) appears, a
opposite side and the distance between the magnet and the
magnetic sensing device shows as a digit that can be converted third measurement shall be taken.
to inch-pound or metric units by reference to a table.
7. Procedure
3. Significance and Use
7.1 Calibration—Calibrate the magnetic sensing device as
3.1 This test method is useful for measuring the wall follows:
7.1.1 Center the magnet supplied with the apparatus on the
thickness of plastic vessels and other plastic structures where
the geometry of the equipment does not permit direct measure- end of the sensor head and depress the “set’’ button. This
establishes the zero measurement point.
ment by conventional methods, such as micrometers, calipers,
and rulers. This test method is not limited to plastics and can be 7.2 Measurement:
7.2.1 Place the magnet used in the calibration procedure
used for all nonmagnetic materials. It provides for a rapid and
accurate thickness measurement, without the need for drilling (7.1) on one side of the material to be measured.
7.2.2 Place the magnetic sensing device on the opposite side
and repair of holes.
3.2 Accuracies are not affected by density variations, per- and move it in a criss-cross motion until the digit reaches its
lowest point. This denotes that the magnetic sensing device is
mitting the measurement of composites made up of a variety of
materials of varying densities. By placement of the magnetic centered on the magnet.
7.2.3 Depress the “set’’ button to lock in the measurement
source on the mold surface, thickness measurement
...

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SCOPE
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