Labomat Essor, your specialist in measuring and testing instruments, presents its Haze measuring devices here

This measurement can be made by reflection or transmission

Haze is an optical effect caused by a microscopic texture or residue on a surface. Visible Symptoms: A milky finish is apparent on the surface with loss of reflected contrast. Halos and patterns can be seen around reflections from high intensity light sources. Causes: poor dispersion, incompatibility of raw materials, additive migration, vehicle quality, baking / drying / curing conditions, polish marks, fine scratches, aging, oxidation, poor cleanliness / surface residue.

What is the Haze measurement by transmission?

Novo-Haze TX quantifies the optical qualities of transparent materials. The two most important aspects are:

1. Transmission - a measure of the total amount of light that passes through a material which is influenced by absorption and reflection properties. In the plastic film industry, the transmission measurement is linked to the opacity of the material and / or to the hiding power of the applied coatings.

2. Transmission Haze - a measure of the light scattering characteristics of a material. Fog can be due to airborne particles or contaminants in a sample or to fine surface texture and contamination.

The haze measurement can be used to quantify the optical characteristics of plastics and packaging films.

In packaging applications, blurry films can reduce the consumer's perception of quality, as packaged products may appear cloudy and indistinct. For plastics with haze, the visibility of the test material becomes more apparent and the contrast of the objects seen is reduced.

Salad seen through a film with or without the Haze effect

Transmission measurement according to: ASTM D1003, CIE C)

The cloudy appearance of transparent materials is an important attribute which determines their suitability for applications. For example, packaging materials should generally be of maximum transparency in order to reproduce the vivid colors and finer details of the product, while for cosmetics, high opacity may be desired. Conventional methods of quantifying the appearance of transparent materials generally use a dedicated "haze-meter" instrument configured to quantify the amount of light scattered over a certain range of angles from the direction of the incident beam. Although established for a long time, this test method suffers from a number of weaknesses. Being based on an arbitrary range of scattering angles, the definition of "haze" does not directly correlate with the human perception of transparency.