Edition 8 / 08.10.2012 Page 1 of 6

The flame retardant for the 21

st century

for application in:

Plastics Paints

Coatings Paper

ALFRIMAL

Edition 8 / 08.10.2012 Page 2 of 6

ALFRIMAL©

Aluminium hydroxide (ATH) and magnesium hydroxide (MDH) are produced and sold by

Alpha Calcit under the brand name ALFRIMAL.

Four product families of ALFRIMAL© are available:

ALFRIMAL aluminium hydroxide Standard ATH

ALFRIMAL aluminium hydroxide Steep ATH

ALFRIMAL aluminium hydroxide Fine ATH

ALFRIMAL MG magnesium hydroxide Fine MDH

Aluminium hydroxide and magnesium hydroxide do function extremely well as flame retardants due to

the fact that they give off a third of their weight in form of water at specific temperatures.

1. This decomposition reaction is endothermic, it uses up energy and by doing so it cools the

fire down.

2. The evaporating water hinders oxygen to get into contact with the flammable gases

from pyrolysis.

3. The remaining oxide stays on the surface of the solids forming a non-reactive protection layer.

Edition 8 / 08.10.2012 Page 3 of 6

ALFRIMAL©

The following table shows the standard ATH grades of ALFRIMAL©.

Standard grades ATH can be used as flame retardant for all applications or they can be combined

with steep and/or fine ATH grades.

Typical particle size distribution of standard ATH grades of ALFRIMAL©

Sta

nd

ard

AT

H

Top cut

[µm] D 50 % Value

[µm] Ry

BET [m2/g]

ALFRIMAL© 449 100 23 94 1

ALFRIMAL© 446 40 12 96 3

ALFRIMAL© 443 28 8 96 4

ALFRIMAL 443

ALFRIMAL 446

ALFRIMAL 449

Edition 8 / 08.10.2012 Page 4 of 6

ALFRIMAL©

S and ALFRIMAL

© X

The following table shows the grades of ALFRIMAL© with steep particle size distribution and steep

ATH can be used in case where sharp top cut is needed and/or finer particle sized products have to

be included into the combination.

Ste

ep

AT

H

Top cut

[µm] D 50 % Value

[µm] Ry

BET [m2/g]

ALFRIMAL© 802 200 90 87 < 1

ALFRIMAL© 601 X 110 60 94 < 1

ALFRIMAL© 447 S 50 17 96 1

ALFRIMAL© 444 S 25 11 96 2

ALFRIMAL© X represents high white ATH grade used e.g. in solid surface applications.

Typical particle size distribution of steep ATH grades of ALFRIMAL©

ALFRIMAL 444 S

ALFRIMAL 447 S

ALFRIMAL 601 XS

ALFRIMAL 802

Edition 8 / 08.10.2012 Page 5 of 6

ALFRIMAL© 104

ALFRIMAL© 104 represents a fine particle-sized product. Whereas standard ATH qualities

show spherical structures, the fine quality is composed of primary particles in the submicron

range which recombine as clusters.

Fin

e

AT

H

Top cut [µm]

D 50 % Value [µm]

Ry BET

[m2/g]

ALFRIMAL© 104 10 3,6 96 10

ALFRIMAL

© MG-H 4

ALFRIMAL© MG-H 4 is based on natural magnesium hydroxide (brucite). H means hydrophobic .

Magnesium hydroxide shows a high pH-value of 10 in combination with a BET surface of 7 m²/g. This

results in a high activity in formulations and as catcher of acid fire gasses in flame protection agents

as well as in PVC formulations. ALFRIMAL© MG-H 4 is temperature resistant up to 300 °C.

ALFRIMAL© MG-H 4 is required for products with compounding and/or processing temperatures of >

200 °C when ATH shall not be used. ALFRIMAL© MG-H 4 can be used for polypropylene even at

processing temperatures of about 250 °C.

Fin

e

MD

H

Top cut [µm]

D 50 % Value [µm]

Ry

ALFRIMAL© MG-H 4 20 4 95

Typical particle size distribution fine grades of ALFRIMAL©

ALFRIMAL 103

◙ ALFRIMAL 104

◙ ALFRIMAL MG-H 4

Edition 8 / 08.10.2012 Page 6 of 6

o Headquarter and Western Europe

Alpha Calcit Füllstoffgesellschaft mbH & Co. KG

Otto-Hahn Strasse 9 - 11

D 50997 Cologne

Germany

www.alpha-calcit.de

Phone +49 2236 8914-0

Fax +49 2236 40644

info@alpha-calcit.de

o Eastern Europe

Alpha Mineral Füllstoffgesellschaft mbH

Gallmansegg 40

A 8573 Kainach

Austria

Phone +43 3148 2310711

Fax +43 3148 7157

info@alpha-calcit.at

Plant, NL-Amsterdam

Plant Querceta, Italy

Alpha Compound, D-Cologne

Alpha Micron, I-Sacile TR-Saraylar

Alpha Calcit Granulat, A-Kainach