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Oil AbsorptionNYTAL talc has low oil absorption in the 25-40g/100g range.
NYTAL 3300 and 7700 grades have a narrower PSD and
lower oil absorption than standard Nytal grades. Minex®
oil absorptions are even lower (20-35g/100g), allowing
higher loadings and increased solids volume in primers and
topcoats to meet increasingly stringent VOC regulations
without compromising rheological properties.
pHThe pH of NYTAL talc is in the 9.5 to 10 range. The pH
of Minex® is similar, providing formulation compatibility and
package stability.
BrightnessVanderbilt reports GE brightness values of 88 or higher for
NYTAL. Minex® offers TAPPI brightness values in the 80-90
range for clean, crisp whites and tint bases.
WeatheringMinex® S-4, Minex® S-7, and Minex® S-10 are the
industry standards for colour retention and chalking
resistance. Minex® provides superior colour retention and
chalk, dirt and mildew resistance when compared to Nytal.
Weathering studies are available upon request.
Minex® Functional Fillers
MorphologyNYTAL talc, produced in Gouverneur, New York by R T
Vanderbilt, is a mineral mixture containing approximately
70% tremolite, a hard silicate, and 30% platy talc. As such
its behaviour in paint formulations is more similar to hard
fillers such as Minex® than it is to traditional talcs. It can be
seen from the micrographs below that both minerals have
an angular morphology.
V.08.2011
Replacement for Nytal Industrial Talcs
Figure 1 Nytal®
Figure 2 Minex®
Property Comparison TableGrade D50/µm Hegman pH Brightness Oil Absptn/g/100g
Nytal 200 10 1 9.5 88 29
Minex 3 10.8 2.5 9.9 87 24
Nytal 300 5.5 4 9.5 88 29
Minex S-6 5.1 5 10.1 85 22
Nytal 400 3.0 5.0 9.5 88 39
Minex S-7 4.3 5.5 10.2 86 27
Nytal 7700 2.0 6.5 9.5 91 39
Minex S-10 1.9 6.4 10.3 85 33
Nytal 3300 10 4.0 9.5 88 25
Minex S-4 9.2 4.0 10.1 82 21
Sibelco Specialty Minerals Europe
Op de Bos 300, NL-6223 EP Maastricht
P.O. Box 423, NL-6200 AK Maastricht
T + 31 (0)43 3663777, F +31 (0)43 3648272
www.sibelco-specialty-minerals.eu Our companies are ISO-certificated