Properties

Fastness Properties.

The fastness properties were tested on polyester with 5 g/l Niu® White R Liquid by Pad - Thermosol method. The figures give information on change in whiteness:

Light : 5 - 6
Washing : 40º C (Test 1) : 5
60º C (Test 3) : 5
95º C (Test 4) : 4 - 5
Perspriration : alkaline : 5
Acidic : 5
Dry Cleaning : 4
Dry - Heat pleating : Mild (180ºC) : 5
Severe (210 C) : 4 - 5
Water : 4 - 5
Sea Water : 4 - 5
Hypochlorite Bleaching : 4 - 5

Fluorescent Brightening Agent Chemical Definition.

The Fluorescent Brightening Agent are colourless fluorescent dyes. They are also called Optical Brighteners. In accordance with their definition as "COLORLESS" Fluorescent dyes, their Colouristic performance is that of fluorescent dyes, without absorbing light in the visible range of the spectrum. They absorb ultraviolet rays present in incident sunlight. This absorbed ultraviolet light is Re-Emitted by the Fluorescent Brightening Agent, which is of longer wavelength than the incident ultraviolet light and is known as the Fluorescence light. This generally falls in the blue region of the visible spectra. The Fluorescence light is then superimposed on the reflected light thereby restoring the balance of different colours and hence producing brilliant white effect.