ALTANA Haze-Gard Dual - Manual (Page 43)

42
English
Illumination
Specimen
comp-port
Light trap
11.3 The Measurement Principle
A beam strikes the specimen and
then enters an integrating sphere.
The light, which is uniformly distri-
buted by the matte white coating on
the sphere wall is measured by a
detector. The total transmittance is
measured with the sphere outlet
closed and haze is measured with
the outlet open.
In the measurement method based
on ISO 13468 and ISO 14782, the
sphere effectiveness is taken into
account in the measurement.
11.4 Standards
ASTM D 1003:
Standard Test Method for Haze and
Luminous Transmittance of Trans-
parent Plastics.
ASTM D 1044:
Standard Test Method for Resis-
tance of Transparent Plastics to
Surface Abrasion.
ISO 13468
Plastics - Determination of the total
luminous transmittance of transpa-
rent materials.
ISO 14782
Plastics - Determination of haze for
transparent materials.
11 Parameters