Plastics Technology Laboratories  

Haze and Luminous Transmittance of Transparent Plastics

ASTM D1003
(method B)

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Haze is the scattering of light as it passes through a transparent material, resulting in poor visibility and/or glare. Haze can be inherent in the material, a result of the molding process, or a result of surface texture. Haze can also be a result of environmental factors such as weathering or surface abrasion. Luminous Transmittance measures the amount of light that passes through a sample. Thus haze and transmission measurements can be useful in product development, process development, and end use performance testing.

Test Procedure:
The BYK Gardner Spectrophotometer is highly automated. After specifying the illuminant, observer angle, and the reference color, the test sample is inserted into the specimen holder, and the spectrophotometer takes the reading. Three readings should be taken and the results averaged.

Specimen size:
Typically a 50 mm (2") or 100 mm (4") disk, although any flat sample that the specimen holder will grasp can be tested.

Haze (%)
Total Luminous Transmittance (%)
Diffuse Transmittance (%)

Equipment Used:
BYK Gardner Spectrophotometer

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**Please note that this test description is intentionally generic in nature and aimed at providing a descriptive summary to enhance test understanding. For more information please contact a Intertek PTL Technical Representative at . Due to copyright restrictions, we are not able to provide copies of standards. Standards can be obtained from appropriate standards authorities.

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