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Significance and Use
Measured gloss values of specimens depend on the angle of illumination, refractive index of the material, and the geometric distribution of the reflected light.
Haze is produced by irregularities in the reflecting surface that affect the distribution of flux reflected around the specular angle. The procedures specified in Test Method D 523
In this test method, values for reflection haze are obtained from two measurements of specular gloss, one made with a large receptor aperture and the other made with a small receptor aperture. The geometric conditions have been chosen to permit the use of glossmeters that provide 60° specular gloss measurements (large receptor aperture) and 20° specular gloss measurements (small receptor aperture) as specified in Test Method D 523
An additional method for the measurement of reflection haze is given in Test Method E 430
1.1 This test method describes a procedure for using two specular gloss measurements to obtain a haze index for high-gloss nonmetallic specimens (1-4). It is particularly useful for evaluating the haze in clear finishes on nonglossy substrates, and the haze in reflected images produced by the surfaces of opaque glossy pigmented finishes.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D523 Test Method for Specular Gloss
D823 Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels
D3964 Practice for Selection of Coating Specimens for Appearance Measurements
E284 Terminology of Appearance
E430 Test Methods for Measurement of Gloss of High-Gloss Surfaces by Abridged Goniophotometry
ICS Number Code 87.040 (Paints and varnishes)
ASTM D4039-09, Standard Test Method for Reflection Haze of High-Gloss Surfaces, ASTM International, West Conshohocken, PA, 2009, www.astm.orgBack to Top