Registration Dossier
Registration Dossier
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EC number: 270-659-9 | CAS number: 68475-76-3 A complex combination of finely divided inorganic particles separated from the exit gases formed during the manufacture of Portland cement. The flue dust consists of uncalcined raw materials along with partially calcined materials. Some Portland cement clinker is usually included. The major constituents of kiln dust are calcium carbonate, clays, shales, quartz and sulfate salts. The following materials may also be present:@Dolomite@Ca(OH)2@Feldspars@CaSO4@Fly ash@KCl@Iron oxides@K2CO3@CaF2@K2SO4@CaO@Na2SO4@Glasses of SiO2, Al.s@Portland cement chemicals [659
Endpoint summary
Administrative data
Description of key information
Flue Dust is not acutely toxic.
Key value for chemical safety assessment
Acute toxicity: via oral route
Endpoint conclusion
- Dose descriptor:
- LD50
- Value:
- 2 000 mg/kg bw
Acute toxicity: via inhalation route
Endpoint conclusion
- Dose descriptor:
- LC50
- Value:
- 6 040 mg/m³ air
Acute toxicity: via dermal route
Endpoint conclusion
- Dose descriptor:
- LD50
- Value:
- 2 000 mg/kg bw
Additional information
To save animal life, no separate acute oral toxicity testing was done. Information are available from a oral repeated dose toxicity study, where flue dust was tested as part of the animal diet. Even with the highest tested dose (1848 mg/kg bw in the dose range find study) no mortality was observed. So it is assumed that in a single acute toxicity test, even a dose of 2000 mg/kg bw will not implicate mortality.
In an acute dermal toxicity study in rats with Flue Dust, no deaths occured at the limit dose of 2000 mg/kg bw. Therefore, the LD50 for acute dermal toxicity is > 2000 mg/kg bw.
From an acute inhalation toxicity study in rats with Flue Dust, it was concluded that the 4-hour LC50 for Flue Dust is above 6.04 g/m³ for male and female rats.
Justification for classification or non-classification
The available information indicates that Flue Dust is not acutely toxic. Therefore, classification for acute toxicity is not warranted.
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