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Chemical Sampling Information (CSI)
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General Description

Synonyms: Plumbago, Potelot; Corbo minerals; Black lead; Carburet of iron; Silver lead; Crayon noir

OSHA IMIS Code Number: 9090

Chemical Abstracts Service (CAS) Registry Number: 7782-42-5

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: VV7780000

Chemical Description and Physical Properties:

a soft greasy-feeling solid platy mineral useful as a lubricant
molecular weight: 12
vapor pressure: approx 0 mm
melting point: 6040°F

Incompatibilities: Very strong oxidizers, such as fluorine, chlorine trifluoride, potassium peroxide

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

General Industry: 15 mppcf (Z-3)

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 2 mg/m3 TWA (Respirable fraction)

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 2.5 mg/m3 TWA

Health Factors

Potential Symptoms: Coughing, dyspnea, black sputum, pulmonary function impaired; fibrosis

Health Effects: Cumulative lung damage (Pneumoconiosis) (HE10)

Affected Organs: Respiratory system, CVS

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • sampling media: Tared Low Ash Polyvinyl Chloride (LAPVC) filter 5 microns preceded by 10 mm Nylon Cyclone
    maximum volume: 960 Liters   
    maximum flow rate:     2.0 L/min
    current analytical method: Gravimetric analysis followed by X-ray diffraction
    method reference: 11, 2 (OSHA ID-142)
    sampling and analytical error: 0.02
    method classification: Fully Validated
    note: Field method for determining compliance with Graphite standard. Following this analysis, submit sample to the Salt Lake Technical Center for analysis of free Silica content (OSHA Method ID-142). If the free silica exceeds 1%, apply the Free Silica standard. If the free silica is <1%, apply the Natural Graphite standard. If filter is not overloaded, samples may be collected up to an 8-hour period. Submit bulk sample in separate package when request for silica analysis is made.

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