BS EN ISO 21068-1:2008
Chemical analysis of silicon-carbide-containing raw materials and refractory products General information and sample preparation
Standard number: | BS EN ISO 21068-1:2008 |
Pages: | 18 |
Released: | 2008-09-30 |
ISBN: | 978 0 580 58091 8 |
Status: | Standard |
BS EN ISO 21068-1:2008
This standard BS EN ISO 21068-1:2008 Chemical analysis of silicon-carbide-containing raw materials and refractory products is classified in these ICS categories:
- 81.080 Refractories
This part of ISO 21068 gives definitions and specifies techniques for the preparation of samples for the chemical analysis of silicon-carbide-containing raw materials and refractory products including:
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graphite brick containing silicon carbide;
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silicon carbide brick (includes the bricks containing silicon nitride);
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refractories containing carbon and/or silicon carbide mixed with clay;
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refractories containing carbon and/or silicon carbide mixed with silica (and fused silica);
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refractories containing carbon and/or silicon carbide mixed with high alumina material;
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refractories containing carbon and/or silicon carbide mixed with magnesia (and dolomite);
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refractories containing carbon and/or silicon carbide mixed with chrome mineral or magnesia-chrome materials;
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refractories containing carbon and/or silicon carbide except those described in a) to g) above.
The items of chemical analysis described in ISO 21068, Parts 1 to 3 are as follows:
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loss on drying (LOD);
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loss on ignition (LOI);
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total carbon, Ctotal;
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free carbon, Cfree;
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silicon carbide, SiC;
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free silicon (Sifree);
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free aluminium (Alfree);
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free magnesium (Mgfree);
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free iron (Fefree);
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silicon(IV) oxide (SiO2);
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aluminium oxide (Al2O3);
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iron(III) oxide (total iron oxide calculated as Fe2O3);
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titanium(IV) oxide (TiO2);
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calcium oxide (CaO);
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magnesium oxide (MgO);
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sodium oxide (Na2O);
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potassium oxide (K2O);
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chromium(III) oxide (Cr2O3);
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zirconium oxide (ZrO2);
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boron oxide (total boron calculated as B2O3);
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nitrogen;
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oxygen;
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nitrides (undifferentiated: Si3N4, AlN, BN, sialon, oxy-nitrides, etc.).
The range of determination specified in this part of ISO 21068 is given in Table 1.
Table 1
Range of determination
Component | Range % by mass |
---|---|
LOI | –10 to 99 |
Ctotal | 0,01 to 99 |
Cfree | 0,01 to 99 |
SiC | 3 to 99 |
Sifree | 0,1 to 10 |
Alfree | 0,1 to 10 |
Mgfree | 0,1 to 10 |
Fefree | 0,1 to 10 |
SiO2 | 0,1 to 95 |
Al2O3 | 0,1 to 95 |
Fe2O3 | 0,1 to 15 |
TiO2 | 0,1 to 5 |
CaO | 0,1 to 60 |
MgO | 0,1 to 95 |
Na2O | 0,1 to 5 |
K2O | 0,1 to 5 |
Cr2O3 | 0,1 to 40 |
ZrO2 | 0,1 to 1 |
B2O3 | 0,1 to 5 |
Si3N4 | 0,1 to 35 |