Bayferrox® 943 is a reddish iron oxide yellow pigment. Find out more about our HIGH PERFORMANCE PIGMENTS under www.bayferrox.com

1. Inorganic Pigments
Competence Center Paints
Bayferrox®
943

2. 2
Bayferrox®
943 is a reddish iron oxide yellow pigment
which was launched more than 20 years ago and is proven in
practical use. While most iron oxide yellow pigments crystallize
to form a Goethite-like lattice (α-FeO(OH)), Bayferrox®
943
has the crystal structure of Lepidocrocite (γ-FeO(OH)). The
differences are shown in figure 1.
Bayferrox®
943
Crystal structure of Goethite Crystal structure of Lepidocrocite
The differences in the crystal structure lead to a different
shape of the pigment particles (figure 2). Compared to
Bayferrox®
930, which has a pronounced needle shape like
nearly all iron oxide yellow pigments, the Bayferrox®
943
particles have a significant lower aspect ratio. That means the
relationship of length to thickness is significant smaller. Thus the
Bayferrox®
943 shows a different viscosity behavior
Electron micrograph
of Bayferrox®
943
Electron micrograph
of Bayferrox®
930
Figure 1:
in pigment preparations. Due the low aspect ratio this
pigment produces also a much less silking effect than other
iron oxide yellows.
Figure 2:

3. Figure 4:
Coloristic Properties
The difference in the crystal structure has an influence on the
light absorption respective on the reflectance (figure 3) and with
that on the coloristic properties.
Bayferrox®
943
3
Figure 3: Spectral reflectance of Bayferrox®
943 in comparison
to Bayferrox®
930
0,0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
1,0
200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800
Bayferrox 930
Bayferrox 943
Caused by the difference in the light absorption, this product
is characterized by its reddish, relative brilliant color shade and
high tinting strength. The color shade of Bayferrox®
943 is
special compared to other iron oxide pigments (figure 4). One
can reach areas in the color space which are normally not ac-
cessible for iron oxide pigments alone.
Shade as generated by printing technique used.
100 % color accuracy cannot be guaranteed due to printing techniques.
Full Shade 1:5 Reduction with Tronox®
R-KB-2

4. Viscosity Behavior
As mentioned before the pigment crystallizes in very short nee-
dles. Beside that the shape of the crystals is the reason for an
interesting low viscosity behavior in pigment preparations, even
at high shear rates, which is of special importance if the pigment
preparation is used in tinting machines (figure 6).
Bayferrox®
943
4
1:25
1:10
1:5
1:1
1:0
16,0
26,0
36,0
46,0
56,0
0,0 5,0 10,0 15,0 20,0
Bayferrox 910 Bayferrox 920 Bayferrox 930 Bayferrox 943
Figure 5: Coloristic properties of Bayferrox®
943 compared with regular
Bayferrox®
yellow types, reduced with Tronox®
R-KB-2 in different
ratio’s (1 : 0; 1 : 1; 1 : 5; 1 : 10; 1 : 25 with pvc 10 % in medium oil alkyd)
Figure 6: Viscosity behavior in a
universal colorant (52% solids)
at different shear rates
0,0
0,5
1,0
1,5
2,0
2,5
3,0
0,0
Bayferrox 910 Bayferrox 943
200 400 600 800 400 600 800
viscosity
[Pa.s]
shear rate [s-1
]
Cone-Plate Rheometer
Figure 5 shows the coloristic behavior of Bayferrox®
943
in comparison to regular iron oxide yellows in full shade and in
various reductions with titanium dioxide. Although Bayferrox®
943 is an iron oxide pigment, its performance properties differ
from those of the other Bayferrox®
products.

5. 5
0
5
10
15
20
25
30
35
40
160 170 180 190 200 210 220 230 240 250 260
Heat stability of Bayferrox®
943 in Silikophen®
P80X(full shade) (45 mi-
nutes at the mentioned temperature). Shade as generated by printing technique
used. 100 % color accuracy cannot be guaranteed due to printing techniques.
Figure 8: Color deviation of Bayferrox®
943 in
Silikophen®
P80X (full shade), versus temperature
(treated 45 minutes at the respective temperature)
Heat Stability
The heat stability of the product is similar to that of the other
iron oxide yellows. The pigment powder is unaffected by
temperatures up to approx. 180 °C. In coating systems the
binder has a certain stabilizing function regarding the heat
Bayferrox®
943
Figure 7:
stability. Depending on the system, the pigment could be used
at temperatures up to slightly above 200 °C (figures 7 and 8). It
is always recommended to check the limits of the heat stability
in the original system under the intended conditions.

6. Weather and Chemical Stability
Bayferrox®
943 also exhibits the excellent weather
stability found in other iron oxide pigments. A system based
on a weather-stable binder and pigmented with Bayferrox®
943 will exhibit similar properties to systems colored with
other Bayferrox®
pigments. Color retention is slightly poorer
in systems based on sensitive binders. It is always recom-
mended that the user carries out trials.
Like all iron oxide pigments Bayferrox®
943 is resistant to
alkalis and completely insoluble in organic media.
Uses
Bayferrox®
943 can universally be used in all coatings
systems. In powder and coil coatings the limited heat stability
must be considered.
The clean reddish undertone makes the pigment perfect to
reach a number of pastel tones which are normally not ac-
cessible with iron oxide yellow alone. Due the relative clean
color shade and high tinting strength and the low viscosity
behavior the pigment has also a high performance in tinting
systems.
Bayferrox®
943
6
Beside the coatings application, Bayferrox®
943 is suit-
able for use in plastics, as long as they do not require high
heat stability. Another popular application for Bayferrox®
943 was found in laminated paper.

7. 7

8. LANXESS Deutschland GmbH
Business Unit Inorganic Pigments
Competence Center Paints
47812 Krefeld, Germany
www.lanxess.com
www.bayferrox.de
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sult your LANXESS representative in Germany or contact
the Regulatory Affairs and Product Safety Department of
LANXESS Germany or – for business in the USA – your
LANXESS Corporation representative, the LANXESS
Regulatory Affairs Manager in Pittsburgh, Pennsylvania.
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mulations and recommendations are beyond our con-
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Bayferrox®
is a registered trademark of Bayer AG, Leverkusen, Germany.