Do HunterLab sphere instruments conform to ASTM D1003? Follow
Yes, but note there are two different approved instrument geometries cited in the ASTM 1003 method.
The industry reference method for instrumental haze measurement is ASTM D1003 Standard Test Method for Haze and Luminous Transmittance of Transparent Plastics. This is written around the design of the original Haze meter with a 0°/diffuse sphere geometry, a 30-mm diameter port and defined collection angles.
Our sphere instruments with CIE d/8° geometries will measure relative transmittance haze in close agreement with a conforming ASTM D1003 Procedure A Haze meter and meet the requirements of ASTM D1003 Section 8 Procedure B Spectrophotometers.
Our colorimetric spectrophotometers and the Haze Meter both have sphere geometries but they are not identical nor were they designed to be. As shown in ASTM D1003, Procedure B Table 4, conforming sphere instruments such as HunterLab’s will agree closely with the original Hazemeter at the low clear end and pick up a gradual bias to about 2.5 units at the Haze% = 30 level.
HunterLab sphere spectrophotometers are built in conformance with a CIE d/8° sphere geometry for measuring color. In addition to relative Haze% and Y Total in transmittance, they can measure product color (L*, a*, b*, color differences, Yellowness Index, Y transmittance, Whiteness Index in transmittance and reflectance including and excluding the specular reflectance).
For many applications where a transparent solid or liquid must be “clear and colorless”, HunterLab sphere spectrophotometers can quantify both with a single measurement.
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