MaTestLab > Test Standards > ASTM A342 Standard Test Methods for Permeability of Weakly Magnetic Materials
Last updated 10th March 2025
ASTM A342 Standard Test Methods for Permeability of Weakly Magnetic Materials
ASTM A342 includes four procedures for measuring the relative permeability of materials with a relative permeability not exceeding 6.0. Materials often tested using these methods, like austenitic stainless steels, might display weak ferromagnetism, resulting in variations in magnetic permeability and magnetic field strength. Therefore, results obtained through different methods may not closely match. Four methods are used to perform this specification.
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ASTM A342 Introduction
ASTM A342 encompasses four procedures for determining the relative permeability of materials with a relative permeability not exceeding 6.0. Materials commonly tested by these methods, such as austenitic stainless steels, may exhibit weak ferromagnetism, meaning their magnetic permeability varies with magnetic field strength.
ASTM A342 Test Method
Fluximetric Method
This method is suitable for materials with relative permeabilities ranging from 1.0 to 4.0.
Low Mu Permeability Indicator Method
This method is appropriate for measuring the permeability of a material as either “less than” or “greater than” that of calibrated standard inserts, with relative permeabilities falling between 1.01 and 6.0.
Flux Distortion Method
Flux distortion testing is applicable for materials with relative permeabilities ranging from 1.0 to 2.0.
Vibrating Sample Magnetometry
The test method is suitable for materials with relative permeabilities falling within the range of 1.0 to 4.0.
A342 Equipment and Sample Preparation
Specimen Detail
Materials commonly examined using these methods, such as austenitic stainless steels, may exhibit weak ferromagnetism.
Specimen Size
The test specimens must be straight bars, rods, wires, or strips with a uniform cross-section. The cross-sectional area should be at least 0.2 cm² [20 mm²], and the length should be no less than 10 cm [100 mm].
A342 Test Result and Interpretation
ASTM A342 is a standard test method that effectively detects the permeability of materials with a permeability equal to or less than 6. The magnetic properties of the materials are also observed.
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Tests Related to ASTM A342
ASTM A342 is related to tests, including ASTM A34 for magnetic material sampling and ASTM A341 for measuring magnetic properties based on direct current in soft magnetic materials.
Use of A342 in Various Industries
It is one of the widely used standards among aerospace, automotive, and electronics industries to ensure the compatibility of weakly magnetic components in applications like shielding, sensors, and precision instruments, especially in those areas that deal with electromagnetic interference.
Materials Commonly Tested with A342
It tests stainless steels, nickel-based alloys, and weakly magnetic materials, used in low magnetic permeability environments such as medical devices, scientific equipment, and cryogenic applications for materials with minimal magnetic distortion.
Common Challenges and Troubleshooting in A342 Testing
Testing has its challenges in maintaining consistent conditions, dealing with variations in specimens, and ensuring the calibration of equipment. Troubleshooting usually involves instrument drift, improper sample placement, and contamination. Adherence to the guidelines of the standard is crucial to minimize inaccuracies.
Safety and Best Practices in A342 Testing
Tests related include careful management of equipment as well as electromagnetic fields avoiding operator exposure or instrument damage. It also includes use of routine calibration, utilization of clean, accurately-sized samples, and compliance to specific environmental conditions.
Importance of A342
It is an important standard in measuring magnetic permeability, which ensures that weakly magnetic materials meet specific application requirements, ensuring product performance, regulatory compliance, and quality assurance in demanding applications such as precision instrumentation and EMI-sensitive environments.
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Where can I get the astm a342 tested?
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Please contact us for a detailed quote for your astm a342 testing needs. Cost incurred to carry out different astm a342 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.
How many samples are required for astm a342?
The required number of samples or specimens should comply with the procedure given in the astm a342 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
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How many days will it take to complete the astm a342 test?
The turnaround time for astm a342 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
Where can I get the astm a342 tested?
You can share your astm a342 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm a342 test to various testing techniques.
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