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Tetramethyl lead (as Pb)

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Synonyms & Trade Names
Lead tetramethyl, Tetramethylplumbane, TML
CAS No.
75-74-1
RTECS No.
TP4725000
DOT ID & Guide
Formula
Pb(CH₃)₄
Conversion
IDLH
40 mg/m3 (as Pb)
See: 75741
Exposure Limits
NIOSH REL
TWA 0.075 mg/m3 [skin]
OSHA PEL
TWA 0.075 mg/m3 [skin]
Measurement Methods
NIOSH 2534
See: NMAM or OSHA Methods
Physical Description
Colorless liquid (unless dyed red, orange, or blue) with a fruity odor. [Note: Main usage is in anti-knock additives for gasoline.]
Molecular Weight
267.3
Boiling Point
212°F (Decomposes)
Freezing Point
-15°F
Solubility
0.002%
Vapor Pressure
23 mmHg
Ionization Potential
8.50 eV
Specific Gravity
2.00
Flash Point
100°F
Upper Explosive Limit
?
Lower Explosive Limit
?
Class II Combustible Liquid: Fl.P. at or above 100°F and below 140°F.
Incompatibilities & Reactivities
Strong oxidizers such as sulfuryl chloride or potassium permanganate
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
insomnia, bad dreams, restlessness, anxious; hypotension; nausea, anorexia; delirium, mania, convulsions; coma
Target Organs
central nervous system, cardiovascular system, kidneys
Personal Protection/Sanitation
(See protection codes)
Skin:Prevent skin contact (>0.1%)
Eyes:Prevent eye contact
Wash skin:When contaminated (>0.1%)
Remove:When wet or contaminated (>0.1%)
Change:Daily
Provide:Quick drench (>0.1%)
First Aid
(See procedures)
Eye:Irrigate immediately
Skin:Soap wash immediately
Breathing:Respiratory support
Swallow:Medical attention immediately
Respirator Recommendations

NIOSH/OSHA

Up to 0.75 mg/m3:
(APF = 10) Any supplied-air respirator

Up to 1.875 mg/m3:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode

Up to 3.75 mg/m3:
(APF = 50) Any supplied-air respirator that has a tight-fitting facepiece and is operated in a continuous-flow mode
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece

Up to 40 mg/m3:
(APF = 1000) Any supplied-air respirator operated in a pressure-demand or other positive-pressure mode

Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus

Escape:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister
Any appropriate escape-type, self-contained breathing apparatus

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 0200   MEDICAL TESTS: 0225
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health