Methyl isocyanate liquid and vapor permeation through selected respirator diaphragms and chemical protective clothing.

Details

• Personal Author:
  Berardinelli, Stephen P. Jr. ; Moyer, Ernest S.
• Description:
  Tests were conducted to determine the ability to withstand permeation by liquid methyl-isocyanate (624839) of 22 chemical protective clothing materials and in regulator diaphragms from four different closed circuit, positive pressure self contained breathing apparatuses. The chemical protective clothing materials that exhibited the longest methyl-isocyanate breakthrough times were an MSA aluminum laminate and a Chem Fab Teflon Nomex laminate. The aluminum laminate, however, cracked when flexed. Breakthrough times for most flexed materials were very much shorter than for unflexed materials. Flexing did not affect breakthrough time of one specimen of Teflon Nomex laminate. While no garment material was deemed capable of affording workers adequate protection for at least 1 hour, the Chem Fab laminate was considered the least permeable by liquid methyl-isocyanate. Results of the tests of liquid methyl- isocyanate permeability upon respirator diaphragms indicated that penetration at high concentrations would occur within 2 minutes of direct contact with the material. The authors recommend that total encapsulating suits with the respirator on the inside should be worn by personnel who may come into contact with methyl-isocyanate in either vapor or liquid form during emergency response operations. [Description provided by NIOSH]
• Subjects:
  Manufacturing And Industrial Facilities Occupational Health Personal Protective Equipment Protective Clothing Respiratory Protective Devices Safety
• Keywords:
  Body-protection Chemical-industry-workers NIOSH-Author Personal-protective-equipment Protective-clothing Respirators Respiratory-protection
• ISSN:
  0002-8894
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DSR - Division of Safety Research
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  324-329
• Volume:
  48
• Issue:
  4
• NIOSHTIC Number:
  nn:00169018
• Citation:
  Am Ind Hyg Assoc J 1987 Apr; 48(4):324-329
• CAS Registry Number:
  Methyl isocyanate (CAS RN 624-83-9)
• Federal Fiscal Year:
  1987
• Peer Reviewed:
  True
• Source Full Name:
  American Industrial Hygiene Association Journal
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:c37646d484476fd1e4851aedf7a8a7933da644d17f73ff77454f190cf0b1d71855f1d8d96e060959da380090a92856f7c30d2740a3d827ed23559e780a5c02eb
• Download URL:
  https://stacks.cdc.gov/view/cdc/185186/cdc_185186_DS1.pdf
• File Type:
  [PDF - 560.66 KB ]