On the measurement of haze

Possible pitfalls and errors in the measurement of haze by ASTM Method D 1003 are pointed out and discussed. This property is an important measure of the optical clarity of plastic films and sheets. Although special hazemeters are usually used for the measurement, it is demonstrated that accurate haze measurements can be performed by using widely available integrating‐sphere spectrophotometers. Additional advantages of obtaining both spectrophotometric and goniophotometric data for the characterization and interpretation of haze are pointed out.