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STRUCTURE OF PEARL LUSTRE PIGMENT (MICA / METAL OXIDE)

The effect of reflection, refraction and transmission of light at the individual layers produces interference / pearl effect. (as shown in the Fig..c)


PHYSICAL PROPERTIES:

Form Dry free – flowing powder
Density Approx 3 g /cm3
Chemical Resistance Resistant to diluted acids, alkalis, organic solvents.
Heat stability Non flammable, stable upto 800’c
Light fastness Good and very Good
Water solubility Insoluble
Toxicity Physiologically safe
Food packaging/ Toys for Children SUITABLE (consult national specifications)
Microwaves Behaves neutrally
Oil Number Depending on the pigment between 40 and 80 gram /100 gram.


IRIODIN FOR FOOD PACKAGINGS :
Lead* Pb 0.010% = 100 ppm
      Total amount
Arsenic* As 0.005% = 50 ppm
Mercury* Hg 0.005% = 50 ppm
Cadmium* Cd 0.010% = 100 ppm
Zinc* Zn 0.200% = 2000 ppm
Copper* Cu 0.001% = 10 ppm
      Soluble in N/10HCl
Selenium* Se 0.010% = 100 ppm
Barium* Ba 0.010% = 100 ppm
Antimony** Sb 0.050% = 500 ppm
Chromium** Cr 0.100% = 1000 ppm
Aromatic amines*   0.050% = 500 ppm Extraction method
* in line with French and Italian standards ** in line with Dutch standards ppm = parts per million