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f o r t h e r e f r a c t o r y I n d u s t r y
In the field of modern ‘high-tech’ refractory materials,
superground Martoxid® aluminum oxides from
Huber | Martinswerk play an extraordinary important
role as a high-temperature resistant binding system.
Similar to high quality raw materials [e.g., SiC, white fused alumina and tabular alumina], superground Martoxid® aluminum oxides help fulfill the customer’s requirements concerning high temperature resistance, mechanical stability and processing characteristics, but are more economical.
The demand on high-tech refractory products is marked by a distinct growth worldwide. This tendency can be explained by the following requirements:• Longer operational life of refractories• Operation at higher temperatures• Improved properties for cost effective production
These requirements only could be achieved by using high-quality synthetic raw materials.
Huber | Martinswerk has met the challenge to fulfill the increasing demand of the market and developed the superground Martoxid® MR generation of low soda aluminum oxides.
Based on the low soda aluminas, Huber | Martinswerk offers a wide range of tailor made superground aluminum oxides for different applications:
Martoxid®MR-32;MR-42;MR-42/B;MR-23;andMR-70
These super ground aluminum oxides are preferably used as high reactive binding systems in low and no cement castables as well as in slide gates, nozzles, lances, kiln furnitures and ceramic filters.
The main properties of these aluminas are characterized by particle size distribution, specific surface area and soda content.
The most demanding requirements are met by the Martoxid® MR aluminas:• Low Soda Content [≤ 0.1%]• High Ceramic Reactivity• Low Content of Mixing Water• Excellent Rheological Qualities
Additionally, Huber | Martinswerk offers a line of ground aluminas:
Martoxid®MZS-3;MDS-6;DN-206;andPN-202
Completing the comprehensive product line is our five unground alumina grades:
Martoxid®DN-6;MDS;MZS;PN-6;andRN
We look forward to consulting with you about the product best-suited for your application. More details for all of the high performing Martoxid grades we offer like chemical and physical properties, specific surface area, particle size distribution, water absorption, green density and fired density are featured in this brochure.
KeyChemicalandPhysicalProperties
Superground Martoxid Grades Ground Martoxid Grades
Property
Na2O[%]
Fe2O3[%]
MR-32
≤ 0.1
≤ 0.03
MR-42
≤ 0.1
≤ 0.03
MR-42B
≤ 0.1
≤ 0.03
MR-70
≤ 0.1
≤ 0.03
MR-23
≤ 0.1
≤ 0.03
DN-206
≤ 0.5
≤ 0.03
MDS-6
≤ 0.1
≤ 0.03
MZS-3
≤ 0.1
≤ 0.03
PN-202
≤ 0.5
≤ 0.03
DN-6
≤ 0.5
≈ 0.02
MDS
≤ 0.06
≈ 0.02
MZS
≤ 0.1
≈ 0.02
PN-6
≤ 0.5
≈ 0.02
RN
≤ 0.5
≈ 0.02
Unground Martoxid Grades
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
00 1.0 3.0 5.0 7.0 9.0 11.0 13.0 15.0
DN
-20
6M
DS
-6
MZ
S-3
MR-32
MR-70
PN-202
Me
dia
n P
art
icle
Siz
e [µm
]
Specific Surface Area [m2/g]
MR-23
MR-42
Chemical Property
D50 [µm]
[µm]
DN-6
0.2 – 0.5
80
6
MDS
0.5 – 0.7
70
4
MZS
0.6 – 1.3
70
2.5
PN-6
4 – 14
80
1
RN
0.2 – 20
70
3
Specific Surface Area [m2/g]
Primary Crystal Size
MR-70 MR-32 MR-42/B MR-42 MR-23 PN-202 MZS-3 MDS-6 DN-206 DN-6 MDS MZS PN-6 RN
Refractory Bricks
Ceramic Fibers for InsulationMortars, Cements
SpinelsSlide Gate Nozzles
Preshaped Castables
Kiln FurnitureVibration Castables
Self-Flowing CastablesCeramic Filters for Foundries
CruciblesRiser for Foundries
Slag Binder in Iron and Steel ProductionGunning Castables
Refractory ApplicationsSuperground Grades Ground Grades Unground Grades
Huber | Martinswerk’s Key Martoxid® Calcined Aluminas For the Refractory Industry
f o r t h e r e f r a c t o r y I n d u s t r y
Martoxid® Unground Grades Specific Surface Area, Average Granule Size [d50] and Primary Crystal Size
Martoxid® Superground and Ground GradesMedian Particle Size Versus Specific Surface Area
Martoxid® Superground Grades Green and Fired Density Ceramic Properties
2.7
2.6
2.5
2.4
2.3
2.2
2.1
225 50 75 100 1500 1550 1600 1650 1700
4.00
3.80
3.60
3.40
3.20
3.00
2.80
2.60
2.50
MR-32
MR-23
MR-42/BMR-70
MR-42
Green Density Fired Density at 100 MPa
[g/c
m3]
[ml/
100
g]
20
15
10
5
0
Water Absorption Data
Operating Pressure [MPa] Temperature [˚C]
MR-32 MR-42/BMR-42 MR-70 MR-23
MR-32
MR-23
MR-42
MR-70
The superground Martoxid® aluminum oxide grades meet and exceed the requirements of many applications applicable to the refractory industry. Above you will find key points for green and fired density along with water absorption data for the superground products.
Since we offer five unique products with varying chemical and physical properties, our technical experts will work closely with you to completely understand your specific application to identify and customize the Martoxid product solution perfect for your situation.
THERE ARE NO IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Refer to the Huber | Martinswerk Standard Conditions of Sale for the only express warranties applicable to the Huber | Martinswerk products. Products incorporating Huber | Martinswerk products are not warranted by Huber | Martinswerk. In no event is Huber | Martinswerk liable for consequential damages. Martoxid® is used, applied for, or registered as a trademark of Huber | Martinswerk in various countries around the world. ©2019 J.M. Huber Corporation and Martinswerk GmbH Martoxid/CalcinedAlumina/Refractory/Rev1/Jan2019
Email: [email protected]: hubermaterials.com/refractory
Europe / Middle East / Africa North America
MartinswerkGmbH HuberEngineeredMaterialsKölnerStraße110 3100CumberlandBlvd.D-50127Bergheim Suite600+49-2271-902-0 Atlanta,Georgia30339Fax:+49-2271-902-710 866-564-8237
Huber | Martinswerk has more
than half a century of supplying
Martoxid® calcined aluminas for
refractory industry applications. In addition to our innovative Martoxid grades, we provide superior technical expertise and service along with a deep dedication toward providing fast, personalized customer support. We look forward to working with you. Contact us today for more information and to attain samples of our array of Martoxid® calcined alumina products for your refactory-related applications.
Asia Pacific
HuberFireRetardantAdditives[Qingdao]Co.Ltd.8thFloor;No.2Building,No.7WuyishanRoadHuangdaoDistrictQingdao,Shandong266555China+86-532-58792008
