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ISO 7668-2010 pdf free download
ISO 7668-2010 pdf free download.Anodizing of aluminium and its alloys Measurement of specular reflectance and specular gloss of anodic oxidation coatings at angles of 200, 45°, 60° or 85°
Anodisation de I’aluminium et de ses alliages — Mesurage des caracteristiques de réflectivité et de brillant spOculaires des couches anodiques a angle fixe de 200, 45° 60° ou 85°.
Using a primary reference standard, or the higher of two working standards, adjust the instrument reading to the correct or selected value in the upper part of the scale with the sensitivity control (4.5). If a black-glass standard is used, the instrument shall indicate the relevant specular reflectance value, as indicated in Table 4, for the specular reflectance measurement, or the relevant specular gloss value, as indicated in Table 5, for the specular gloss measurement. if a glass prism is used for Method E, set the reading to the correct value as indicated in Table 3.
Take a second working standard of known specular reflectance or specular gloss for the angle being used, having a value in the lower half of the scale, and make a measurement with the same control settings.
For the specular reflectance measurement, if the reading for the second working standard is within 1 % of its assigned reflectance value, the proportionality requirement of 4.6 is conformed to. For the specular gloss measurement, if the reading for the second working standard in Methods A, B and C is within 1 gloss unit of its assigned value, the proportionality requirement of 4.6 is conformed to. For Method 0, the reading for the second working standard with a 600 gloss lower than 10 gloss units shall be within 1 gloss unit of its assigned value. For the second working standard with a 60° gloss higher than 10 gloss units, the reading may be within 2 gloss units of its assigned value.
If these requirements are not conformed to, the instrument shall be adjusted by the manufacturer, or in accordance with the manufacturers instructions, and the calibration procedure repeated until the second working standard can be measured with the required accuracy.
NOTE The most common cause of Incorrect results is damage or distortion of standards through lack of flatness. presence of dirt, or failure to locate the surface in the correct plane for measurement.
7 Measurement of specular reflectance and specular gloss
Calibrate the instrument as directed in Clause 6 and measure the specular reflectance or specular gloss of the test sample by placing it in firm contact with the instrument so that the plane of incidence and reflection is parallel to the direction of rolling or machining of the test sample. Measurement can be carried out in a plane normal to this direction if the anisotropy of the surface under examination is to be assessed.
7.2 Measurement of specular reflectance
For surfaces of low specular reflectance, set the black-glass primary reference standard (see 5.1.1) to read 10 times the relevant specular reflectance value in Table 4 and multiply each reading by 0,1.
For surfaces with a high specular reflectance, set the apparatus to the relevant specular reflectance value specified in Table 4, using a black-glass primary reference standard. Alternatively, in the case of Method E, the reflectometer may be set to the appropriate specular reflectance value specified in Table 3, using a glass prism (see 5.1.2).ISO 7668-2010 pdf free download.
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