PROJECT REPORT
Total Emittance and Hemispherical Spectral Reflectance Test Report

DSET Report #: 5017501, May 29, 1998

1.0    INTRODUCTION
This report presents results of total emittance and spectral reflectance measurements on the following six coatings on metal coded as:

ULTRA KOTE, SNOWBRITE, INSULKOTE, PERMAKOTE,

PERMAKOTE PLUS, ULTRA KOTE XL

2.0    TEST METHODS AND PROCEDURES;
Emittance
Near-normal infrared reflectance measurements were performed in accordance with ASTM E408-71 (reapproved 1990), method A. A Gier Dunkle Instruments Infrared Reflectometer Model DB 100 was utilized for the measurements.
Inside the detector portion are two semi-cylindrical cavities. One of the cavities is heated by an electrical heater and the other stabilizes at approximately room temperature. Thus, the two cavities are maintained at different temperatures. As the cavities rotate, the sample is alternately irradiated at 13 Hz. A vacuum thermocouple views the sample through an optical system that focuses through slits in the ends of the cavities. The detector receives energy emitted by the sample and energy reflected by the sample. Only the reflected energy contains an alternating component as the sample is alternately irradiated by the hot and cold cavities. An amplifier is synchronized with the cavity rotation to pass only the desired alternating signal, which is then rectified and filtered. The zero and gain are set with standards of known emittance. The calibration is rechecked at several intervals during the measurement. Hemispherical emittance was converted from normal emittance by using equations provided by the National Fenestration Rating Council in NFRC 301-93.
Reflectance
Hemispherical spectral reflectance measurements were performed in accordance with ASTM Standard Test Method E903-88 (1992). The measurements were performed with a Beckman 5240 Spectrophotometer utilizing an integrating sphere (Fig A1.3 of E903-88 (1992)). Total reflectance measurements were obtained in the solar spectrum from 2500nm to 300nm at an incident angle of 15 degrees. The measurements employ a detector-baffled, wall-mounted integrating sphere that precludes the necessity of employing a reference standard except to define the instrument’s 100% line. The measurements are properly denoted as being “hemispherical spectral reflectance”.

3.0    OBSERVATIONS, DEVIATIONS AND WAIVERS
All measurements were performed on the uncoated surface. The values reported for emittance represent the average of at four measurements.

4.0    RESULTS

 

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