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Introduction
 Ceramic saddles for RTO’s are mostly used as heat transfer media and are of much higher density and require good high temperature resistance.
In fact, some customers also accept saddles for chemical and petrochemical use in RTO’s, because both the saddles have nearly same physical and chemical properties.
 Chemical composition
SiO2 |
Al2O3 |
Fe2O3 |
CaO |
K2O+Na2O |
>70% |
23-30% |
<1% |
<1-2% |
<2-4% |
Physical properties
Index |
Value |
Specific gravity(g/cm3) |
2.25-2.35 |
Water absorption(%) |
<0.5 |
Acid-resisting strength, %Wt. Loss (ASTMc279) |
<4 |
Firing temperature(℃) |
1280-1320 |
Softening point(℃) |
>1400 |
Density(kg/m3) |
2350 |
Technical data
Spec. (inch) |
Spec. (mm) |
Approx. weight (kg/m3) |
Surface area (m²/m³) |
Free volume (%) |
Packing factor (l/ft) |
1/2” |
12 |
720 |
623 |
71.7 |
200 |
3/4” |
19 |
688 |
334 |
73 |
130 |
1” |
25 |
688 |
253 |
73 |
85 |
1.5” |
38 |
640 |
164 |
75 |
50 |
2” |
50 |
577 |
115 |
77.4 |
37 |
3” |
76 |
623 |
92 |
75.5 |
24 |
Advantage
These saddles are made from chemical porcelain and have excellent resistance to acids except in the case of hydrofluoric acid.
Moisture absorption must less 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.℃)
XINTAO ceramic saddles for RTO’s softening point is 1400℃ min. And they show good thermal shock resistance during repeated cycling between 20℃ and 820 ℃.
Thermal shock test for saddles for RTO’S
 For example shipping the saddles over 80 M3:
Randomly pick 100-200 pieces of ceramic saddles for RTO’s from the batch or shipment
For each sample selected, heat it up to 820℃ and maintain them at this temperature for 30 minutes
Drop the hot pieces into cold 20℃ water
Repeat steps 2 & 3 for10 times on each and every piece in the sample lot.
Examine the pieces and count the percent that show clear signs of breakage and/or cracking. Our standard is “less” than seven (7%) percent.
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