Dear Sir. Concerning your issue about the determination of TiO2 pigment in the thermoplastic paint using chemical analysis Percent Titanium Dioxide by chemical analysis you can follow this procedure procedure: Weigh the crucible and ash (see Section 9) to 0.1 mg and calculate the percent of ash which is also equal to the percent filler (pigments and beads). After weighing the above ashed materials, carefully transfer the ash to an agate or similar impervious-type mortar. Grind the ash to a consistent fine powder except for the glass beads. The pulverized ash must be stirred each time specimens are taken to weigh the prescribed amount for the analysis. Weigh 1 6 0.1 g of ash for the titanium analysis. Proceed with the titanium analysis as described in Test Methods D 1394. The Jones Reductor or aluminum reduction method may be used. At the end of the digestions described in Test Methods D 1394, filter the undigested materials through a 3-in. 45-µm (No. 325) sieve with hot water. This will prevent clogging of the Jones Reductor. This step is not necessary if the aluminum reduction method is used. Calculate the percent of titanium dioxide (TiO2) from the total ash weighed. The result gives the percent of TiO2 in the total thermoplastic specimen. Calculate the percent ash A as follows:

A =  (S/W). 100

where: S = weight of ash, g, and W = weight of thermoplastic specimen used, g.

Calculate the percent of total TiO2 in the T based on percent ash:

T = 0.08 AMN/CSa

where: A = ash (pigment + filler + beads), %, Sa = weight of ash used, g, M = amount of 0.1 N potassium permanganate (KMnO4) solution used, mL, (see the paragraph on titration with KMnO4 solution of the Procedure section of the Jones Reductor Method of Test Methods D 1394), N = normality of KMnO4 used, C = correction factor for TiO2 pigment used (usually 1.0). This represents the purity of the pigment if specified, and 0.08 = weight of TiO2 per 1 mL of 1 N KMnO4, g. . For more detailed, I think the following below links may help you in your analysis:

http://marron-co.com/marron/PAINT%20STANDARD/ASTM%20%20PAINTS/0602/D4797.pdf

https://www.astm.org/Standards/D1394.htm

Thanks

Thank you sir for the reply.

I am not able to access D1394. Do have a soft copy of ASTM D1394 process.

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