FED-STD-141 Paint, Varnish, Lacquer And Related Materials: Methods Of Inspection, Sampling And TestingThis standard elaborates the methods used to determine the physical and chemical properties of paint, varnish, lacquer, and related materials. The purpose of this standard is to establish standardized testing methodologies and to eliminate unnecessary or undesirable variations in test results when evaluating a product??s adherence to specification requirements. If any variation or modification of the methods established in this standard is required by any specification, the procedures listed in the specification will take precedence. Any conflict between this standard and any particular specification will be resolved in favor of the specification.

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METHOD 6242.2

March 22, 2001

2.2 Standards. Prepare standards by painting or otherwise finishing metal or wood panels in order to

obtain a suitable range of infrared reflectance values. The gloss and texture properties of the standards

should be nearly the same as those of the test specimens. Calibrate the standards according to method

6241.2. Replace the standards when they show signs of deterioration.

3. REAGENTS

3.1 Reagents. None required.

4. PROCEDURE

4.1 Calibrations. The photometer scale shall be carefully calibrated for linearity over the range of

reflectances to be measured. The standards shall be recalibrated at reasonable time intervals.

4.2 Performance of test.

4.2.1 Preparation of test specimen. The test specimen shall be prepared as described in the product

specification.

4.2.2 Determination of reflectance. The instrument readings for the test specimen shall be compared

with those of the standards and the reflectance value of the test specimen determined. Linear

interpolation is permissible if the instrument response is linear or if the scale interval between

reflectance standards is small. Upper and lower limit standards shall be used for a go no-go type of

measurement.

4.3 Report. The report shall include the reflectance values of the specimen for the two wavelength

regions and their acceptability as required by the governing specification. The instruments and standards

used shall be designated or described. Any unusual condition of the test specimen or situation under

which the test was conducted shall be reported. Any deviations from the specifications shall be reported.

5. PRECISION

5.1 Data. No data.

6. NOTES

6.1 Instruments. Other instruments meeting the prescribed irradiating and viewing geometry of the

method are: (1) the Hunter Associates Laboratory Color Difference Meter D25P, and (2) the Zeiss

Elrepho Photoelectric Reflectance Photometer. These instruments have to be modified to provide

detector and filter for measurements according to the method.

6.2 Measurements. Measurements made in the spectral region covered by 2.1.2 are useful when data

applicable to infrared photography are required. Measurements covered in 2.1.3 are intended to be

relatable to infrared image tubes.

FED. TEST METHOD STD. 141D