Test, testing light-fastness

Washing-, rubbing- and light fastness of the dyed PET fibers at different temperatures were also tested. All fastness measurements of the dyed samples with C02PES MARINE SM1F gave very good results. 

In many applications ultramarine blue is stable to around 400 °C, violet to 280 °C and pink to 220 °C. All have excellent light fastness with a 7-8 rating (full and reduced shades) on the International Blue Wool Scale. Color fade attributed to light exposure or moderate heat is almost always caused by acid attack. Ultramarines react with all acids, and if there is sufficient acid, the pigment is completely decomposed, losing all color, to form silica, sodium and aluminum salts, sulfur, and hydrogen sulfide. Evolution of hydrogen sulfide with acids is a useful test for ultramarine. 

The Microtox test system utilizes a strain of naturally occurring luminescent bacteria - Vibrio fischeri. Exposure to a toxic substance causes a disruption of the respiratory process of the bacteria resulting in reduced light output. The effective concentration (EC50) is determined as the concentration of a toxicant that causes a 50% reduction in light output over a prescribed period of time (typically 5, 15, or 30 min). The test is fast, fairly simple to conduct, uses small sample sizes, and is relatively inexpensive. Results correlate well with those from other toxicity bioassays such as fish and Daphnia. The test is used... 

Dye C.I. number Light-fastness effect on dyeing S.D.C. Test 3,... 

The light fastness is of the order of 5 to 6 and washing fastness when tested by the ISO Washing Test No. 2 is between 4 and 5. It is recommended that, in order to achieve the best wet fastness, dyeing should be followed by back tanning, in the manner which will be described when dealing with the application of acid dyes to polyamides. 

Before hand testing of light stabilizing activity of DTIU while introducing it into a polymer as mechanical additive was carried out. Data of Table 24 show that DTIU possesses photostabilizing activity that gives the reason to consider the fact that its condensation with CDA will improve light fastness of the latter. 

R.D. Wagner, R.S. Leslie, F. Sehlaeppi, Methods of testing of light-fastness of textile materials painting//7 ex/. Diem, and color (1985), No 2, 14-24 (in Russian). 

Pugh, S. L., Guthrie, J. T., The Development of Light Fastness Testing and Light Fastness Standards, Rev. Prog. Color. Relat. Top. 2001, 31, 42 56. 

Optical Tests. Refractive index, light transmission, color range, scattering, light fastness. 

Light fastness properties were measured according to ISO 105 B02. Samples were subjected, for 32 h, to artificial light at 420 nm and irradiance of 0.65 W/m. For this purpose, a Q-SUN XENON test chamber was used. 

The microcapsules were found to be most prone to damage from exposure to daylight, where the protective shields were broken and microcapsules deflated (Figure 2.22). Two of the fastness to dayhght tests revealed extremely poor light-fastness properties... 

Light fastness can be determined by the following test norms ... 

Hot light fastness DIN EN ISO 105-B06 Colour fastness and ageing to artihcial light at high temperatures Xenon arc fading lamp test... 

Light fastness DIN ISO EN 105-B02 Colour fastness to artificial light Xenon arc fading test... 

Light fastness was tested in air drying paint at 1 /3 SD. Assessment was made against the 8-step Blue Scale (DIN 54003) in which rating 8 denotes excellent and rating 1 very poor light fastness. 

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