Registration Dossier
Registration Dossier
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EC number: 231-545-4 | CAS number: 7631-86-9
Exposure related observations in humans: other data
Administrative data
- Endpoint:
- exposure-related observations in humans: other data
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: review - expertise - secondary source
Data source
Reference
- Reference Type:
- review article or handbook
- Title:
- Gesundheitsschaedliche Arbeitsstoffe. Toxikologisch-arbeitsmedizinische Begruendung von MAK-Werten (Maximale Arbeitsplatz-Konzentrationen). Amorphe Kieselsaeuren
- Author:
- MAK (Kommission zur Pruefung gesundheitsschaedlicher Arbeitsstoffe der Deutschen Forschungsgemeinschaft)
- Year:
- 1 994
- Bibliographic source:
- VCH Verlagsgesellschaft mbH, Weinheim
- Report date:
- 1989
Materials and methods
- Type of study / information:
- occupational exposure concentrations (monitoring)
- Endpoint addressed:
- not applicable
Test guideline
- Qualifier:
- no guideline available
- GLP compliance:
- no
Test material
- Reference substance name:
- Silicon dioxide
- EC Number:
- 231-545-4
- EC Name:
- Silicon dioxide
- Cas Number:
- 7631-86-9
- Molecular formula:
- O2Si
- IUPAC Name:
- dioxosilane
- Details on test material:
- FK 700, 86.65 % SiO2, 7.3 % hydration water (SiO2): Silica, precipitated, crystalline-free, CAS No.: 112926-00-8:Specific surface area (BET) = 700 m2/g
Constituent 1
Method
- Exposure assessment:
- measured
- Details on exposure:
- TYPE OF EXPOSURE: Inhalation
TYPE OF EXPOSURE MEASUREMENT: Area air sampling
EXPOSURE LEVELS: below MAK value
EXPOSURE PERIOD: =< work shift
DESCRIPTION / DELINEATION OF EXPOSURE GROUPS / CATEGORIES: no details
Results and discussion
Any other information on results incl. tables
Measurements that were conducted in the silica-producing or processing industry (Germany) during 1984 and 1986 resulted in average values of 2.2 and 4.4 mg/m3 of inhalable dust, the values of respirable dust during simultaneous determination (27 measurements) ranged between 0.7 and 1.7 mg/m3.
During industrial processing of amorphous silicas in various companies in the 1980th (Germany), concentrations of respirable dust ranged from 0.04 to 1.9 mg/m3 with an average of 0.46 mg/m3 (56 measurements). These findings included general dust that may have been unrelated to the specific process.
Applicant's summary and conclusion
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
