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Chemical Sampling Information (CSI)
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General Description

Synonyms: Hydrogenated MDI; Dicylohexylmethane-4,4'-diisocyanate; HMDI; Desmodur W

OSHA IMIS Code Number: 2651

Chemical Abstracts Service (CAS) Registry Number: 5124-30-1

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: NQ9250000; 44209

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: UN3080 Poison, Flammable

Chemical Description and Physical Properties:
solid
molecular formula: C15H22N2O2
Exposure Limits

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 0.005 ppm, 0.054 mg/m3 TWA

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 0.01 ppm ceiling

Health Factors

Health Effects: Irritation-Skin---Marked (HE14) Skin sensitization (HE3); Asthma (HE9)

NIOSH/OSHA/DOE Health Guideline: Methylene-bis(4-Cyclohexylisocyanate)

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):
  • sampling media: Coated Glass Fiber Filter (37 mm open face) Coated with 1.0 mg 1-(2-Pyridyl)piperazine
    analytical solvent: 90/10 (v/v) Acetonitrile/Dimethylsulfoxide
    minimum time: 15 Minutes
    maximum flow rate: 1.0 L/min (Ceiling)
    analytical method 1: High Performance Liquid Chromatography; HPLC/UV/FLU
    method reference: 2 (OSHA PV2092)
    method classification: Partially Validated
    note: OSHA personnel may obtain coated filters from SLTC. Refrigerate coated filters and protect from light until used.
Conditions: Column: Mobile Phase: Detector Wavelength: Detection Limit:

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