Polishing - Alteo Alumina

Specialty aluminas
Polishing
applications
201311112
www.alteo-alumina.com
Technical
features
Polishing
Polishing is a multi-stage
process that aims to improve
the surface condition of any
object.
These stages are:
Pre-polish
Polish
Finishing
During each polishing step two sequential
actions take place:
Stock removal
Buffing or Lapping
During stock removal, alumina agglomerates
break down into primary crystals that
continue the “smoothing” or buffing action.
The polishing behaviour of an alumina is
measured and expressed by two key
characteristics:
Cut (the ability to remove stock)
Polish ( the ability for buffing/lapping)
02
The calcination degree determines the
primary crystal size and therefore the
stock removal capability of an alumina.
Large primary crystals will give more
abrasion. A coarse alumina grade will
generate higher stock removal compared to
a finer grade, but agglomerate toughness is
dominant.
ALTEO has developed a wide range of
tailor-made polishing grade aluminas, taking
advantage of its unique range of specialty
alumina feedstock and access to the
required processing technologies.
Polishing Aluminas
Product range
Our polishing aluminas can be applied in all
of the usual ways:
In solid compounds
In liquid compounds
As dry powder
In suspension – slurry
All of our grades meet key customer
requirements:
Well defined topcut
Stable PSD
Consistent product quality
Contamination free
The best alumina-based products by
segment
Segment
Very soft
soft
Product
Medium
Medium hard
Hard
Steel, Stainless Steel
Chrome
Brass
Non-ferrous Metals
Precious Metals
Aluminium
Stones
Plastics
Wood
Glass
Electronics
Varnishes
Cleaners Automotive
Rubbing compounds
03
Very soft
agglomerates
A4G10, A4G20, A4BS,
AR75B10
Type:
Very fine and low calcined grades.
Properties:
Low to very low cut and very high polish
effect.
Technical interest:
Used to give a high gloss.
Applications:
Steel & Stainless steel, precious metals,
stones, plastics, wood, glass, electronics,
varnishes, cleaners, automotive rubbing
compounds.
Characteristics
D50
Top cut
BET
Alpha Alumina content
Primary crystal
Oil absorption
Na2O
Cut
Polish
Unit
A4G10
A4G20
A4BS
AR75B10
μm
0.5
8
6
95
~
0.4
16
0.06
1
9.5
2
20
2.2
~95
1.8
14
0.06
2
7.5
2.5
16
75
~25
<0.1
43
0.25
2
9
8
75
75
~25
<0.1
48
0.25
3
6
μm
m2/g
%
μm
ml/100g
%
-
Typical data
Soft
agglomerates
AR12TA, AR12B25, AR12B15,
AR12B10, AR12B5, AR12BFM
Type:
Low calcined grades.
Properties:
Low cut and high polish effect.
Technical interest:
Used to give a high gloss.
Applications:
Steel & Stainless steel, chrome, brass,
non-ferrous metals, precious metals,
stones, plastics, glass, electronics,
varnishes, cleaners, automotive rubbing
compounds.
Characteristics
Unit
D50
Top cut
BET
Alpha Alumina content
Primary crystal
Oil absorption
Na2O
Cut
Polish
μm
μm
m2/g
%
μm
ml/100g
%
-
AR12TA AR12B25 AR12B15 AR12B10 AR12B5 AR12BFM
25
100
12
~70
<0.4
46
0.35
2.5
8
45
200
12
~70
<0.4
50
0.35
3
8
15
90
12
~70
<0.4
42
0.35
2
8
10
75
12
~70
<0.4
40
0.35
1.5
8.5
5
40
12
~70
<0.4
38
0.35
1
9
3.5
20
12
~70
<0.4
38
0.35
1
9
Typical data
100
AR12BFM
AR12B5
Particle size distribution Malvern Mastersizer S
90
80
70
60
AR12B10
AR12B15
AR12B25
(%) 50
40
30
20
10
AR12TA
04
0
0
1
10
100
1000
Medium
agglomerates
Characteristics
AR308TA AR4TA AR4B25 AR4B15 AR4B5
Unit
D50
Top cut
BET
Alpha Alumina content
Primary crystal
Oil absorption
Na2O
Cut
Polish
μm
μm
m2/g
%
μm
ml/100g
%
-
50
200
8
85
~
<1
48
0.35
3.5
7.5
90
200
5
92
~
<1
50
0.25
6
3
15
100
5
92
~
<1
42
0.25
4
4
25
125
5
92
~
<1
46
0.25
5
3.5
5
53
5
92
~
<1
38
0.25
3.5
5
AR4SB
AR308TA, AR4TA, AR4B25,
AR4B15, AR4B5, AR4SB
0.5
8
7
92
~
<1
28
0.25
1.5
7.5
Type:
Calcined aluminas with an alpha content
of ~90%.
Technical interest:
Mainly used for polishing and finishing
when both treatments are required. Also,
for pre-polishing.
Applications:
Steel & Stainless steel, brass, non-ferrous
metals, aluminium.
Typical data
Medium hard
agglomerates
Characteristics
AC44B6 AC44B5 AC44B4 AC34B3 AC12TA AC12B15 AC12B5
Unit
D50
Top cut
BET
Alpha Alumina content
Primary crystal
Oil absorption
Na2O
Cut
Polish
μm
μm
m2/g
%
μm
ml/100g
%
-
6
63
0.8
>97
2.5
23
0.35
5
4
5
45
0.9
>97
2.5
22
0.35
5
4
4
32
1
>97
2.5
21
0.35
5
4
3.5
20
1.2
>97
2.7
20
0.25
4
5
40
200
1
>97
1.5
54
0.04
4
7
15
90
1.2
>97
1.5
34
0.04
3
6.5
5
63
1.3
>97
1.5
26
0.04
2.5
7
AC44B6, AC44B5, AC44B4,
AC34B3, AC12TA, AC12B15, AC12B5
Type:
Calcined aluminas with a high alpha
content.
Technical interest:
Mainly used for pre-polishing. These
grades are also used for polishing and
finishing when both treatments are
required.
Applications:
Steel & Stainless steel, chrome.
Typical data
100
Particle size distribution (Cilas)
90
AC34B3
AC44B4
80
70
60
AC44B5
AC44B6
(%) 50
40
30
20
10
0
0.1
1
10
100
1000
05
Hard
agglomerates
AC45TA, AC36TA, AC35TA,
AC35B5
Type:
Calcined aluminas with a high alpha
content.
Technical interest:
Mainly used for pre-polishing.
These grades are used for polishing when
both treatments are required.
Applications:
Steel & Stainless steel, chrome.
Characteristics
D50
Top cut
BET
Alpha Alumina content
Primary crystal
Oil absorption
Na2O
Cut
Polish
Unit
AC45TA
AC36TA
AC35TA
AC35B5
μm
50
200
0.6
>97
2.5
46
0.35
7
3
65
200
0.4
>97
3.2
50
0.25
8.5
2
70
200
0.45
>97
2.9
48
0.25
8
3
5
32
0.6
>97
2.9
20
0.25
5
3
μm
m2/g
%
μm
ml/100g
%
-
Typical data
06
ALTEO
AT A GLANCE
World’s largest supplier of specialty aluminas
with 700 000 tonnes of alumina based products
(hydrate, calcined, tabular and fused aluminas)
Headquartered in Gardanne (France)
with 4 production facilities in Europe
Global sales network
Development centre in Europe
Leading positions
www.alteo-alumina.com
ALTEO - Route de Biver B.P. 43
13541 Gardanne Cedex
France
design: www.sharkydesign.com
in Abrasives, Refractory, Ceramics (technical and
standard), Specialty Glass, Chemicals, Feedstock

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