These saddles are mostly used as heat transfer media and are of much higher density and require good high temperature resistance.These saddles are called "Saddle for RTO’s".
In fact, many customers also accept Ceramic Saddle as the use in RTO’s, Since both the saddles have nearly same physical and chemical properties. Such as Olpidurr, LTG, Anguil etc.
Chemical composition for Saddle for RTO’s
|
SiO2
|
Al2O3
|
Fe2O3
|
CaO
|
K2O+Na2O
|
|
>70%
|
23-30%
|
<1%
|
1-2%
|
2-4%
|
Physical properties for Saddle for RTO’s
|
Index
|
Water absorption
%
|
Acid-resisting strength %Wt. Loss(ASTMc279)
|
Firing temperature
℃
|
Softening point
℃
|
Density
kg/m3
|
|
Value
|
<0.5
|
<4
|
1280-1320
|
>1400
|
2350
|
Geometric Properties of Saddle for RTO’s
|
Nominal
size
|
Approx. weight
|
Surface area
|
Void fraction(%)
|
Packing factor(1/ft)
|
|
lb/cuft
|
Kg/m3
|
ft2/ft3
|
m2/m3
|
|
1/2"
|
45
|
720
|
190
|
623
|
71.7
|
200
|
|
3/4"
|
43
|
688
|
102
|
334
|
73
|
130
|
|
1"
|
43
|
688
|
77
|
253
|
73
|
85
|
|
1.5"
|
40
|
640
|
50
|
164
|
75
|
50
|
|
2"
|
36
|
577
|
35
|
115
|
77.4
|
37
|
|
3"
|
39
|
623
|
28
|
92
|
75.5
|
24
|
These saddles are made from chemical porcelain and have excellent resistance to
acids except in the case of hydrofluoric acid.
Moisture absorption must beless than half a percent.
The porcelain’s specific gravity is 2.3-2.4g/cm3 and an average heat capacity(between 20℃ and 500℃ of 0.22 cal/g.℃)
Saddle for RTO’ss’softening point is 1400℃ min. And they show good thermal shock resistance during repeated cycling between 20℃ and 820 ℃.
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