Gloss measurement

Gloss is the property people argue about most, because the eye recognises it instantly but cannot put a number on it. A reflectometer measures how much light a surface reflects specularly at a defined angle and turns the impression into a figure in gloss units. Only then can a batch be released, a complaint be substantiated, or a tolerance be agreed at all.

The measuring angle follows the gloss range: 60° is the standard angle for the mid range, 20° resolves more finely in high gloss, and 85° separates matt surfaces that all look alike at 60°. Instruments with three angles in one housing take that decision off your hands. If haze is involved — the milky halo beside the reflection — an additional haze measurement is needed; it explains why two panels with identical gloss values can look different.

What matters when choosing

• The gloss range of the surface dictates the angle — when in doubt, use a three-angle instrument
• Clarify the test standard required by the customer or quality system beforehand
• Measurement spot size must suit the part geometry, especially on small or curved parts
• Mobile use in production or stationary laboratory work
• Statistics, data storage and connection to your QC evaluation
• Plan the calibration standard and check interval from the start

Instruments in this category

Trade names from our range. Click a name to ask Corvus — he knows the technical data and helps you narrow things down.

Data sheets, operating manuals and quotations are available on request. We quote prices individually, because configuration, accessories and the scope of calibration decide the figure.

After the purchase

An instrument is only worth something once its readings hold up. Calibration, adjustment, repair and operator training are handled from Aesch — the same contact, the same language.