Properties
The data are summarized in Tables
The tests are carried out under the following conditions:
Light fastness
The light fastness is determined, in the case of water – soluble dyes in
aqueous solution and in the case of color lakes and iron oxides in
nitrocellulose, against the 8 – step
wool scale (DIN 54 004) where 8 denotes the best light fastness.
It is to be noted that the light fastness of the colorant can be affected by
the substrate.
Solubility
The data denote: g of colorant in 1000g of solvent.
A solution prepared in accordance with the data in Table 1 exhibits no
precipitate after 24 hours at 20 ° C.
Acid and alkali resistance
Tested in various acid and alkali concentrations. The data relate to a
24-hour test of the colorant. The assessments have the following
significance.
Very good = resistant in 10% strength hydrochloric acid and sodium carbonate
solution.
Good = resistant 1% strength hydrochloric acid and sodium carbonate
solution.
Satisfactory = resistant 0.1% strength hydrochloric acid and sodium
carbonate solution.
Moderate = resistant 0.01% strength hydrochloric acid and sodium carbonate
solution.
Poor = not resistant in 0.01% strength hydrochloric acid and sodium
carbonate solution.
Heat resistance
The colorant is tested in the form pf a powder. The figure stated is the
highest temperature at which no coloristic change occurs in 4 hours .
The effect of the substrate on the temperature resistance of the colorant
must be taken in to account.
Specifications
The specifications and analytical methods of the Varnacol/Varnalite grades
are available on request.
Application
Water – soluble dyes are generally used in the form of aqueous solutions.
Here it must be taken into account that the solubility in
hard water is lower than in demineralized water.
If dry mixtures are colored, the colorant should be mixed beforehand into an
aliquot of the product.
Miscibility
The water- soluble Varnacol dyes are miscible in any proportion, as are the
insoluble Varnalite color lakes and the insoluble Varnalite iron oxides.
Form supplied
Powder
For specific applications, some products are available in other forms, for
example as pastes or granules.
Storage
The powders have a virtually unlimited shelf life, provided they are kept
cool and dry in sealed vessels.
Safety
The colorants mentioned herein have no known adverse effects, if property
used.
If handled correctly with due attention to the safety and industrial hygiene
precautions necessary in handling chemicals and to the instructions and
directions contained in
our safety data sheets, these colorants cause no deleterious effects
according to our past experience and the information available to us.
Please Note
The directions given in this publication are to the best of our present
knowledge. Owing to the large number of possible factors in the processing
and application of our products, they do not release the processor from the
obligation to carry out his own tests and trials. No legally binding
assurance of certain properties or of the suitability for a specific use may
be derived from our directions. Any property rights and existing rules and
regulations must be heeded by the recipient of our products on his own
authority. |