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Paints solubility tests

In some laboratories, comparative analyses begin with solubility tests. The difference between the suspect and the control samples can often be determined quickly through the reaction and the different solubility of the paint binders with a variety of chemical reagents (e.g., chloroform, acetone, concentrated sulfuric acid, etc.) only when differences cannot be detected with these tests is it necessary to employ instrumental methods. [Pg.1727]

If solubility tests reveal that microtraces of paint contain organic pigments, these latter can be... [Pg.1727]

If an exhibit of evidence is consumed in testing, the tests performed on it can never be repeated or verified. While this is not a limitation when the case consists of several milliliters of blood or a large bindle of white powder, other cases are not so simple. If the exhibit is a single fiber or one tiny paint chip, analytical options are limited. Solubility tests would be a poor choice for a single paint chip, but microspectrophotometry (nondestructive) would be ideal. [Pg.6]

FIGURE 14.5 Residual content of HD on painted metal test sheets for solvents with different solubility parameters. The hatched range marks the region of typical solubility parameters of CW agents and gives the acceptable level of residnal contamination. (Based on data from Wellert, S., Imhof, H., Altmann, H.J., Dolle, M., Richardt, A., and Hellweg, T., Colloid Polym. ScL, 285, 2008.)... [Pg.396]

Figure 14.5 shows the result of decontamination of HD from two sorts of painted metal test sheets for several solvents. The residual content, reflecting the residual contamination after decontamination, is plotted as a function of the solubility parameter of the used solvents. For solvents with solubility parameters comparable to values of CW agents the lowest and tolerable residual contents were observed [4]. [Pg.396]

Even small traces of certain corrosion stimulants, notably soluble chlorides and sulphates, can maintain a continuing corrosion process under a paint film because the salts accelerate the initial dissolution of ferrous iron (and other metal ions) but are not immobilised in the hydrated oxide corrosion products. Filiform corrosion is the most spectacular example of this phenomenon, but progressive spread, preceded by blistering, is also observed from scratches or other breaks in a coating, for example during salt spray tests. [Pg.618]

This catalytic system was very flexible because by simple modification of the reaction conditions it was possible to prepare oxidized polymers with the desired level of carboxyl and carbonyl functions. No waste was formed because the process did not involve any acids, bases or buffer solutions. The incipient wetness process is very easy to scale up. Hydrophilic starch was prepared in batches of 150 L and incorporated successfully in paint formulations. Good results were also obtained with in vitro and in vivo tests for cosmetic formulation. Interestingly, this is a rather unique example of a heterogeneous catalytic process involving a soluble catalyst and a solid substrate. [Pg.69]

The first attempts at predicting solubility were largely empirical. Paint technologists employed various approaches. In one approach kauri-butanol values were equal to the minimum volume of test solvent that produced turbidity when added to a standard solution of kauri-copal resin in 1-butanol. The aniline point is the lowest temperature where equal volumes of aniline and the test solvent are completely miscible. Both tests are measures of the relative aromaticity of the test solvent. [Pg.51]

Qualitative chemistry is an area of chemistry concerned with identifying substances. In Activity 9.1 you will perform a qualitative analysis to detect the presence of certain ions that, in turn, may reveal an art forgery. The ions could come from paints that were not available at the time of the artwork. In this qualitative analysis, metal ions (cations) and nonmetal ions (anions) are reacted with solvents and with each other. Then the cations and anions present are identified by the products produced. In addition, flame tests and pH determinations are used to identify ions. Qualitative analysis is an engaging opportunity for you to develop experience with chemical change and review solubility principles. Nowadays, however, most of the time a chemist analyzes a substance to detect ion content using quantitative analytical computerized instruments. [Pg.330]

If your painting involves stripping first, use one of the following biodegradable, water-soluble, noncaustic, nontoxic strippers. Also be sure not to strip paint with lead in it. If you re not sure, and have an old house, have it tested. [Pg.47]

The removal of soils and stains by application of solvents to the tapa using the suction feature of the table was not successful. A Bolivian tapa hood with a painted decoration was chosen for testing of stain removing capabilities. The hood had been defaced with green felt-tip marker ink, which proved soluble in a variety of solvents, including both acetone and water. [Pg.178]

Colouring substances on the basis of naphthoilentetracarboxylic acid for mass dyeing of PA-fibres using polymeric concentrate of the dye [113] were obtained in Rubezhansk branch of SRAPIK. It should be noted that the most part of the dyes of this class are yellow and apply yellow paint on PA fibre and are fully soluble in polymer melt. Dyes of the following structures were tested ... [Pg.16]

Hansen, C.M., Solubility parameters, in Paint Testing Manual, J.V. Koleske, Ed., American Society for Testing and Materials, Philadelphia, 1995, 383 04. [Pg.556]

Desai and Clarke (149) reported successful results using zinc-containing compounds. Sell et al. (ISO, 151) described surface treatment with chromium-copper-boron salts. Field weathering tests, leaching tests, and electron-probe microanalysis showed that this treatment was resistant to leaching and weathering. Water-soluble extractives in redwood and redcedar were fixed by treating the wood surface with dilute solutions of copper and chromium salts. This treatment permits direct application of latex paints to these woods (146). [Pg.290]


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