Altana Haze-Gloss Manual Uživatelský manuál stáhnout pdf (Strana 20)

AUTO-RANGE

60°

20.7

85°

47.2

• If highly reflective surfaces are

measured using the 60° geometry

and the measured value exceeds 70

units, the measurement should be

repeated using the 20° geometry.

• Matt surfaces showing measured

values of less than 10 units (using the

60° geometry), should be measured

using the 85° geometry.

In order to obtain a better differentiation

of the measured values, we recom-

mend the 85° geometry in all cases in

which the value measured at 60° is

below 30 units. Application recommen-

dations differ in the various standards.

While the ASTM D 523 standard sets

the upper limit for changing from 60° to

85° geometry at the value of 10 gloss

untis, ISO 2813 sets this limit at 30

units. These limits should be regarded

as recommendations.

Mirror Reflection Measurements

The haze-gloss offers an extended

measuring range, which allows for the

measurement of samples with great

reflecting power (polished metal

surfaces, mirrors). In this mode the

gloss values range up to:

2000 gloss units at 20°

1000 gloss untis at 60°

160 gloss units at 85°

(calibration performed at the manufac-

turer).

As mirror gloss measurements are

often related to customers' standards,

haze-gloss offers the possibility to

calibrate against customer-specified

standards (see Chapter 5, Calibration).

Note

• In the auto-range mode the 60/85°

dual angle geometry is used for

reflectometer values below 30; the

60° single angle geometry is used for

reflectometer values between 30 and

70, and the 20°/60° dual angle geo-

metry is used for reflectometer values

exceeding 70. (Reflectometer values

always relate to 60°)

• It is not useful to take measurements

on samples showing contaminations,

scratches or other damages, unless

you want to evaluate the degree of

such defects by means of gloss

measurement.