ASTM C201

Standard Test Method for Thermal Conductivity of Refractories

The heat flow through a refractory is determined with a water-cooled copper calorimeter. The temperature limit of refractory must be specified, as well as the hot face or mean test temperatures desired. The maximum hot face temperature for testing is 2700°F. The specimens required are six 9" bricks or an 18" x 13.5" x 2.5" slab.

First hot face temperature specified:  $1400
Each additional test temperature:  $350
First mean temperature specified:  $1650
Each additional test temperature:  $350

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SIGNIFICANCE AND USE

The thermal conductivity of refractories is a property required for selecting their thermal transmission characteristics. Users select refractories to provide specified conditions of heat loss and cold face temperature, without exceeding the temperature limitation of the refractory. This test method establishes the testing for thermal conductivity of refractories using the calorimeter.

This procedure requires a large thermal gradient and steady state conditions. The results are based upon a mean temperature.

The data from this test method are suitable for specification acceptance, and design of multi-layer refractory construction.

The use of these data requires consideration of the actual application environment and conditions.

1. SCOPE

1.1 This test method covers the determination of the comparative thermal conductivity of refractories under standardized conditions of testing. This test method is designed for refractories having a conductivity factor of not more than 200 Btu·in./h·ft2·°F (2818 W/m·K), for a thickness of 1 in. (25 mm).

1.2 Detailed ASTM test methods to be used in conjunction with this procedure in testing specific types of refractory materials are as follows: Test Method C 182, Test Method C 202, Test Method C 417, and Test Method C 767.

COPYRIGHT NOTICE

Extracted, with permission, from ASTM C201 Standard Test Method for Thermal Conductivity of Refractories, copyright ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. A copy of the standard may be purchased from ASTM International, phone 610-832-9555, e-mail: service@astm.org, website:www.astm.org.

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