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These organic pigments find wide. application in plastics, plaints liquid inks, Textiles, rubber,cosmetics, artist colours, etc. they have exellent dispersion and ethology characteristics required for printing ink requirements with good transparency gloss and tone these pigments are homogenous belonging to azo or phthalocyanine groups.
The physical chemical, colouristic as well as fastness properties of the pigments depend to a large extent on the type of binders used, presence of driers, hardners, the substrate and film thickness etc.
Specific Gravity: Specific gravity has been determined in an inert liquid at 20 C
Oil Absorption: 10gm of pigment is placed on a glass plate and acid refined linseed oil is added from a burrette in drops, and the paste rubbed to get a spreadable paste the quantity of Oil required for 100gmsof pigment is then calculated and expressed as ml. 01/100 grm pigment.
Light fastness: The prints of the pigments dispersed in printing ink medium is exposed along with standard blue scale and rating expressed in 1 to 8 scale 8 denoted excellence and 1 denotes poor fastness.
Heat Resistance: A stoving paint of the pigment is prepared in non-yellowing medium and applied to a tin panel, the temperature upto which there is negligible change in the shade after stoving for 30 minutes in noted.
Fastness to solvents and chemicals: The test is carried out by placing 0.5gms of pigment in a folded paper, sealed at the top and suspended in 20 cc of solvent in a stopped test tube at room temperature for 24 hours. the staning noted and expressed in 1 to 5 scale.
Fastness to solvents and chemicals: The test is carried out by placing 0.5gms of pigment in a folded paper, sealed at the top and suspended in 20 cc of solvent in a stopped test tube at room temperature for 24 hours. the staning noted and expressed in 1 to 5 scale.
In case of water, acid or alkali 0.5 gm of pigment is mixed with 10ml each and these liquid heated in a water bath for 10 minutes cooled and filtered, the filterate is assessed for colouration.
Soap Bleeding: The test is carried out by placing completely dried draw down/print on 20% jelly made with neutral white soap for 24 hours extent of bleeding noted and expressed in 1 to 5 scale.
Fastness Data:
Light fastness: 1-8Scale, 8 denotes excellent and 1 denotes poor.
other fastness: 1-5Scale 5 denotes excellent and 1 denotes poor.
Abbreviations:
Sieve Residue is determined by working up a known quantity of pigment in water and carrying out wet sieving of pigment water slurry under running tap water using gentle brushing with soft bristle brush, residue obtained on 240 mesh (0.063 mm) screen dried, weighed and reported in accordance with DIN 53195.
The percentage by mass of matter volatile from a pigment sample is determined at 105 C by means of an infra red lamp, the sample is being heated off until it reaches constant weight (according to ISO 787/2) and weight loss is reported.
pH is determined as per DIN ISO 787. An aqueous pigment slurry containing 5% pigment is filtered off and filtere's pH value is measured by a calibrated glass electrode pH meter at room temperature and reported.
Sample preparation for spectro - photometer exposure is carried out carefully and accurately using respective pigment. Full shade(full tones) are self colour of pigments Reduction shades (reduction tones) are reduced shade with TiO2 Rutile.
Area View :Small area view
Observer : 10o
light source : D65 artificial daylight
Geometry : 8o Diffuse spec. Incl.
Residual shade in accordance with CIElab formula (DIN6174) is divided inti dL,dC dH and dE.
Weather fastness is carried out on controlled prepared stoving paint of respective pigment in full shade and reduction shade in duly calibrated QUV weatherometer for 600 hours and reported on 1-5 scale greyscale. (1-poor and 5-excellent)
Determination of heat stability is determination of temperature in C at which the discolouration correspondans to the colour difference, dE-3.0 units.
Printing inks : Tested in metal deco (long oil alkyd resin system) for 30 mins.
Paints : Tested in alkyd/melamine system for 30 mins.
Plastic : Tested in polyolefins. it is however advisable for a user to carry out heat stability tests in applicationunder given set of processing conditions Intended.
Fastness to bleed (plastics): Fastness to bleed or migration resistance is the extent of bleeding into wrapper/ rubber / white polythene sheet at 30 C for 24 hours. Migration resistance is reported on 1-5 scale (1-poor, 5- excellent).
The information provided is based on our present state of knowledge and is intended to proved general notes on our products and their uses. It should not therefore be construed as guaranteeing specific properties of the products described of their suitability for a particular application. Any existing industrial property rights must be observed. The quality of our products is guaranteed under our general conditional of sale.
