The certification of opal glassFunded under: FP2-BCR 4
The report describes the development of a certified reference material for the calibration of instruments for colour measurements such as colorimeters or spectrophotometers. The aim has been to develop a stable, robust alternative to the normally used barium sulphate, which is brittle and only available in rather small samples. After some trial melts of different compositions of white, opaque glass and measurements of their reflectance and opacity, the final composition as given in the report was selected. The production consisted of 6 melts which gave in total about 1,300 samples of 100 by 100 mm with a thickness of 14 mm. Measurements of the homogeneity of the reflectance of the specimens from different parts of the melts showed that only the first part of each was homogeneous and gave a satisfactory consistency. Samples for certification have therefore only been taken from the first half of each melt. The certified values of the diffuse reflectance have been established. The opacity, fluorescence and thermochromism were also measured and found satisfactory.
Bibliographic Reference: EUR 12833 EN (1990) 58 pp., MF, ECU 4, blow-up copy ECU 7.50
Record Number: 199011207 / Last updated on: 1994-12-01
Original language: en
Available languages: en