Question: Can HunterLab transmittance instruments measure Haze and Clarity?
While the term "clarity" is a common noun that refers to the transparency or purity of a substance it has two very different Colorimetric meanings depending on Industry of use. Two answers will be provided, one for the measurement of transparent plastics and one for the measurement of pharmaceutical liquids.
Answer for Transparent Plastics:
Haze equals the percentage of regular rays that are diffracted greater than 2.5 degrees from normal. This is sometimes called Wide angle scattering and this measurement is defined by ASTM D1003.
Clarity equals the percentage of regular rays that are diffracted at an angle of less than 2.5 degrees from normal. This is sometimes called Narrow angle scattering. This measurement can only be done using a Hazemeter that is configured either specifically for a Clarity reading, or once that that dual detectors to simultaneously collect both Wide and Narrow angle scattering.
The Vista can measure both the color and the %Haze of a specimen, it can not measure the Clarity. A Hazemeter can measure both the %Haze and Clarity of a specimen, it can not measure the Color.
Answer for Pharmaceutical Liquids:
EP2.2.1 The Clarity and Degree of Opalescence of Liquids, states "A liquid is considered clear if its clarity is the same as that of water R or of the solvent used when examined under the conditions described above, or if its Opalescence is not more pronounced than that of reference suspension I
HunterLab transmission instruments can be used to measure the color and clarity and opalescence of Pharmaceutical liquids.
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