Methylene bisphenyl isocyanate
|
CAS
101-68-8
|
CH2(C6H4NCO)2
|
RTECS
NQ9350000
|
Synonyms & Trade Names
4,4'-Diphenylmethane diisocyanate; MDI; Methylene bis(4-phenyl isocyanate); Methylene di-p-phenylene ester of isocyanic acid
|
DOT ID & Guide
|
Exposure
Limits
|
NIOSH REL: TWA 0.05 mg/m3 (0.005 ppm) C 0.2 mg/m3 (0.020 ppm) [10-minute]
|
|
OSHA PEL: C 0.2 mg/m3 (0.02 ppm)
|
IDLH
75 mg/m3
See: 101688
|
Conversion
1 ppm = 10.24 mg/m3
|
Physical Description
White to light-yellow, odorless flakes. [Note: A liquid above 99°F.]
|
MW: 250.3
|
BP: 597°F
|
MLT: 99°F
|
Sol: 0.2%
|
VP(77°F): 0.000005 mmHg
|
IP: ?
|
|
Sp.Gr: 1.23 (Solid at 77°F) 1.19 (Liquid at 122°F)
|
Fl.P: 390°F
|
UEL: ?
|
LEL: ?
|
|
|
Combustible Solid
|
Incompatibilities & Reactivities
Strong alkalis, acids, alcohol [Note: Polymerizes at 450°F.]
|
Measurement Methods
NIOSH 5521, 5522, 5525; OSHA 18
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily
|
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
|
Respirator Recommendations
NIOSH
Up to 0.5 mg/m3:
(APF = 10) Any supplied-air respirator*
Up to 1.25 mg/m3:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode*
Up to 2.5 mg/m3:
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece
Up to 75 mg/m3:
(APF = 2000) Any supplied-air respirator that has a full facepiece and is 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 having an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters./Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
|
Exposure Routes
inhalation, ingestion, skin and/or eye contact
|
Symptoms
Irritation eyes, nose, throat; respiratory sensitization; cough, pulmonary secretions, chest pain, dyspnea (breathing difficulty); asthma
|
Target Organs
Eyes, respiratory system
|
|
See also: INTRODUCTION
See ICSC CARD: 0298 See MEDICAL TESTS: 0147
|
