Purpose: To discuss the measurement of Haze and what complies with ISO and ASTM methods.
There are several defined ways to measure Haze. These include:
- ISO 14782 Hazemeter with Compensation method Report %Haze D65/10
- ASTM D1003 Procedure A: Hazemeter method Report %Haze C/2 or A/2
- ASTM D1003 Procedure B: Spectrophotometer method Report %Haze C/2 or A/2
- ASTM D1003 Procedure B: Spectrophotometer method1 Report %Haze C/2 or A/2
The HunterLab compensation method uses the Haze port instead of a dedicated Compensation port to determine the intensity of light scattered by the instrument.
ISO 14782 is written such that only a dedicated Haze meter with photo detection that occurs in a sphere that has three ports; Entrance, Exit, and Compensation meets this requirement. VISTA does not conform to this method, but a dedicated Haze meter cannot provide colorimetric results such as XYZ or Lab.
The VISTA does conform to ASTM D1003 Procedure B, and when we employ the HunterLab compensation we get very good correlation to the ISO method. ISO states that in their round robin testing between the ISO 14782 and ASTM D1003 method there was an average 8.9% difference in readings. HunterLab's testing using our ASTM compliant VISTA with the HunterLab compensation method the differences were significantly less.
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