ASTM E423 Standard Test Method for Normal Spectral Emittance at Elevated Temperatures of Nonconducting Specimens

    What is ASTM E423 

    ASTM E423 is an accurate method for determining the normal spectral emittance of electrically non-conducting materials at temperatures ranging from 1000 to 1800 K and wavelengths ranging from 1 to 35 m. This test method requires a specific specimen size and design, as well as a specific heating and viewing procedure.

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    This test requires a spectrophotometer. Optical alignment of the spectrophotometer is should be perfect to minimize differences in absorbance along the two paths of the instrument. Careful adjustment of the chopper timing is needed to reduce overlap of the reference and sample signals (cross-talk), and precautions to reduce stray radiation in the spectrophotometer are required to keep the zero line flat. With proper adjustment, the “100 % line” will be flat to within 3%.

    What is the Scope of ASTM E423?

    ASTM E423 is a standard test method for identifying the typical spectral emittance of nonconducting specimens at extreme temperatures.

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    • Materials: It’s especially well-suited to determining the typical spectral emittance of materials like ceramic oxides, which have low heat conductivity and are translucent to significant depths below the surface but become essentially opaque at thicknesses of 10 mm or less.
    • Usage: This test method can be utilized as a reference technique for production and acceptance testing in the event of a disagreement because of its high accuracy.
    • Limitations: Not recommended for routine production or acceptance testing due to requirements for expensive equipment and elaborate precautions (though usable as a reference method in disputes).

    ASTM E423 Samples Preparation and Equipment

    For ASTM E423, the specimens must be hollow cylinders with wall thicknesses sufficient to be essentially opaque, but not exceeding 10 mm, and a diameter of 25.4 +0-0.5 mm.

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    For typical spectral emittance, measure six replicate specimens of each material.

    ASTM E423 Testing Procedure and Requirements

    The utilization of a cylindrical sample that rotates in an electrically heated furnace and achieves virtually isothermal conditions, as well as the use of electronic controls to keep the host specimen and blackbody reference at the same temperature, are crucial aspects of ASTM E423. In general, the measurement process compares the brightness of a heated object to that of a laboratory blackbody furnace operating at the same temperature, as a function of wavelength.

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    ASTM E423 Results Analysis and Interpretation

    ASTM E423 test provides spectral emittance, ∈, of the specimen, where the height of the specimen line, Sλ, minus the zero line, Zλ, divided by the height of the 100 % line, Hλ, minus the zero line, is used to calculate the values. 

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    FAQ

    Where can I get the astm e423 tested?
    You can share your astm e423 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 e423 test to various testing techniques.
    Please contact us for a detailed quote for your astm e423 testing needs. Cost incurred to carry out different astm e423 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.
    The required number of samples or specimens should comply with the procedure given in the astm e423 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
    MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.
    The turnaround time for astm e423 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.
    Malhar Khole
    About Author
    Malhar Khole
    Malhar Khole is a Material Testing Associate at MaTestLab Inc. and holds a postgraduate degree in Material Science and Technology from IIT (BHU), Varanasi.
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