ASTM D1925-70(1988)e1 PDF

Scope: 1.1 This test method is intended primarily for determining the degree of yellowness (or change of degree of yellowness) under day-light illumination of homogeneous, nonfluorescent, nearly colorless transparent or nearly white translucent or opaque plastics. It is applicable to transmittance of transparent and translucent plastics and to reflectance of opaque plastics (Note 1). It is based upon tristimulus values calculated from data obtained on the Hardy-G.E.-type spectrophotometer,* but other apparatus is satisfactory if equivalent results are obtained. 1.2 The values stated in SI units are to be regarded as the standard. NOTE I-This test method has not been demonstrated for the determination of transmitted yellowness of plastics having a luminous transmittance below 25 %, and it has not been demonstrated for the determination of reflected yellowness of translucent plastics. 1.3 This standard may involve hazardous materials, operations, and eqicipment. This standard does not purport to address all o f the safety problems assaciated with its iae. It is the responsibility o f the user o f this standard to establish appropriate safety and health practices and determine the applicability o f regitlatory limitationsprior to use.

ASTM D1925-70(1988)e1 Referenced Document

ASTM D618 Standard Practice for Conditioning Plastics for Testing*， 2021-07-15 Update
ASTM E259 Standard Practice for Preparation of Pressed Powder White Reflectance Factor Transfer Standards for Hemispherical and Bi-Directional Geometries*， 1998-04-21 Update
ASTM E308 Standard Practice for Computing the Colors of Objects by Using the CIE System*， 1999-04-21 Update