Label abbreviations descriptions

METHYLENE BIS(4-CYCLOHEXYLISOCYANATE)

Chemical Identification
CAS # 5124-30-1
Formula
 

C₁₅H₂₂N₂O₂
Synonyms
 

dicyclohexylmethane 4,4'-diisocyanate; DMDI; bis(4-isocyanatocyclohexyl)methane; HMDI; hydrogenated MDI; reduced MDI; saturated MDI; 1,1-methylene bis(4-isocyanatocyclohexane)

Physical Properties
Physical description Clear, colorless to light-yellow liquid.
Boiling point Molecular weight 262.4
Freezing point/melting point <14°F Vapor pressure 0.001 mmHg at 77°F
Flash point >395°F Vapor density
Specific gravity 1.07 at 77°F Ionization potential
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating NFPA fire rating
NFPA reactivity rating NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 2651
Sampling group
Sampler/Sampling media Isocyanate Sampling Filter Kit - GFF (37 mm, open-faced) coated with 1 mg 1-(2-pyridyl)piperazine [SLTC103]
Sampling time*
 

15 min
Sampling volume (TWA)*
 

15 L
Sampling flow rate (TWA)*
 

1 L/min
Sampling volume (STEL/Peak/C)*
 
 

 
Sampling flow rate (STEL/Peak/C)*
 

 
Analytical method instruments UHPLC
Method reference OSHA 5002 (fully validated)
Notes
 
 

Refrigerate coated filters until used. Sample open-faced!!
Special requirements
 
 

 

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media
 
 

 
Bulk Method
 
 

 

On-Site Screening Techniques
Device Hazard Assessment Test Kit for Aliphatic Isocyanates
Model/Type 769-1003
Sampling information
(see manufacturer instructions) 		Isocyanate Surface and Dermal Sampling, Hazard Assessment Test Kit for Aliphatic Isocyanates

Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA
 
 

 

 REL-TWA
 
 

 

 TLV-TWA
 
 

0.005 ppm [1985]

 PEL-TWA
 
 

0.005 ppm (0.054 mg/m³)
PEL-STEL
 
 

 

 REL-STEL
 
 

 

 TLV-STEL
 
 

 

 PEL-STEL
 
 

 
PEL-C
 
 

 

 REL-C
 
 

0.01 ppm (0.11 mg/m³)

 TLV-C
 
 

 

 PEL-C
 
 

 
Skin notation
 
 

NA

 Skin notation
 
 

N

 Skin notation
 
 

N

 Skin notation
 
 

N
Notes:
 
 

Not established

 Notes:
 
 

 

 Notes:
 
 

 

 Notes:
 
 

See also Section 5198.
Health factors:  See NIH-NLM PubChem. IDLH
Carcinogenic classifications: Not listed Notes:
 
 

 
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
 
 

 

Additional Resources and Literature References

Last Updated Date : 04/02/2025