1. Scope

1.1 This test method covers the evaluation of specific light-transmitting and wide-angle-light-scattering properties of planar sections of materials such as essentially transparent plastic. Two procedures are provided for the measurement of luminous transmittance and haze. Procedure A uses a hazemeter as described in Section and Procedure B uses a spectrophotometer as described in Section . Material having a haze value greater than 30 % is considered diffusing and should be tested in accordance with Practice E 167.

1.2 The values stated in SI units are to be regarded as standard. Note 1For greater discrimination among materials that scatter a high percent of light within a narrow forward angle, such as is the case with abraded transparent plastics, adjust the hazemeter and perform measurements in accordance with Test Method D 1044.

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.

This test method is not equivalent to ISO 13468-1 and ISO/DIS 14782.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D618 Practice for Conditioning Plastics for Testing

D883 Terminology Relating to Plastics

D1044 Test Method for Resistance of Transparent Plastics to Surface Abrasion

E259 Practice for Preparation of Pressed Powder White Reflectance Factor Transfer Standards for Hemispherical and Bi-Directional Geometries

E284 Terminology of Appearance

E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

E2387 Practice for Goniometric Optical Scatter Measurements

ISO Standards

Keywords

haze; luminous transmittance; regular transmittance; transparent plastics; Haze; Light transmission and reflection; Spectrophotometry; Transmittance and reflectance--plastics; Transparent plastics ;

ICS Code

ICS Number Code 83.140.99 (Other rubber and plastic products)

DOI: 10.1520/D1003-07

ASTM International is a member of CrossRef.