Ceiling Recommended Exposure Limit

Ceiling Recommended Exposure Limit (CREL) Exposure limit which should not be exceeded at any time. 

NIOSH REL-Ceiling (Recommended Exposure Limits — Ceiling NIOSH 2005) is a 15-min ceiling. 

EPA has established that hydrogen sulfide is a regulated toxic substance and is a hazardous substance as defined under the Federal Water Pollution Control Act. OSH A has established an acceptable ceiling concentration of 20 parts per million (ppm) for hydrogen sulfide in the workplace, with a maximum level of 50 ppm allowed for 10 minutes maximum duration if no other measurable exposure occurs. NIOSH has set a maximum Recommended Exposure Limit (REL) ceiling value (10 minutes) of 10 ppm. A complete listing of federal and state regulations and recommendations are found in Chapter 7. 

NOISH Recommended exposure limit guidelines for occupational exposure TWA Ceiling (15 minutes) IDLH... 

Recommended Exposure Limit (REL) was developed by the National Institute for Occupational Safety and Health (NIOSH) and defines the highest allowable airborne concentration that is not expected to injure a worker expressed as a ceiling limit of time-weighted average for an eight- to ten-hour work day. 

Recommended Exposure Limit for Occupational Exposure (Ceiling) ... 

Also included are recommended exposure limits (RELs) pubhshed by NIOSH (1997) and/or threshold limit values (TLVs) published by the American Conference of Govermnental Industrial Hygienists (ACGIH). Unless noted otherwise, the NIOSH RELs are TWA concentrations for up to a 10-h workday during a 40-h workweek. The short-term exposure limit (STEL) is a 15-min TWA that should be exceeded at any time during the workday. Recommended ceiling values are concentrations that should never be exceeded at any time during the day. 

Exposure limits OSHA has set a PEL for hydrogen bromide as 3 ppm in an 8-hour period (TWA). Similarly, NIOSH has set a recommended exposure limit (REL) for hydrogen bromide of 3 ppm in working exposure. The ACGIH has set a ceiling of 3 ppm for hydrogen bromide as the working exposure. ... 

Acetylene is recognized internationally as a simple asphyxiant. The American Conference of Governmental Industrial Hygienists recommends that atmospheres containing acetylene have a minimum oxygen concentration of 18%. The National Institute of Occupational Safety and Health has a recommended exposure limit for acetylene of 2500 ppm as a ceiling. 

The National Institute for Occupational Safety and Health (NIOSH) has established a recommended exposure limit for halothane as a waste anesthetic gas of 2 ppm (16.2 mg m ) as a 60 min ceiling limit that should not be exceeded during any part of the workday. 

USA National Institute for Occupational Safety and Health values include a recommended exposure limit of 5 ppm as a 15 min ceiling value, and an immediately dangerous to life or health value of 300 ppm. 

The National Institute of Occupational Safety and Health (NIOSH) recommended exposure limit (REL) ceiling of 10 ppm ( 14mgm ) for 10 min. 

The ACGIH TLV, TWA, for 1,1,2-trichloroethane is reported to be 10ppm or 55mgm on skin. The ACGIH TLV, STEL/CEIL, is reported to be 10 ppm or 45mgm on skin. The NIOSH recommended exposure limit, TWA, is also 10ppm or 45mgm on skin. 

National Institute for Occupational Safety and Health recommended exposure limits 5mgm for total zinc oxide dust as a TWA for up to a 10 h workday and a 40h workweek and a 15 min ceiling of 15mgm (based on the risk of metal fume fever). 

NIOSH Recommended Exposure Limit for Occupation Exposure (8-hr TWA)-aryl or inorganic mercury as mercury mercury (organo) alkyl compounds as mercury mercury vapor as mercury 0.1 mg/m3 ceiling (skin) 0.01 mg/m3 TWA 0.03 mg/m3 STEL (skin) 0.05 mg/m3 TWA NIOSH 1992... 

Non-enforceable guidelines have also been established for formaldehyde. The American Conference of Governmental and Industrial Hygienists (ACGIH) has established a ceiling limit for occupational exposure (Threshold Limit Value [TLV]) of 0.4 ppm. NIOSH has a recommended exposure limit for occupational exposure (8-hour TWA) of 0.016 ppm, and a 15-minute ceiling limit of 0.1 ppm. 

TLV = Threshold limit value, ACGIH recommended exposure limit as an 8-hour time-weighted average for a 40-hour workweek (TLV-TWA) C = ceiling level (see p 528). 

Ceiling limit is an airborne concentration of a toxic substance in the work environment that should not be exceeded. In threshold limit value (TLV) and permissible exposure limit (PEL), or recommended exposure limit (REL), the maximum allowable concentration to which an employee may be exposed. If instantaneous monitoring is not feasible, then the ceiling is a 15-minute time-weighted average exposure not to be exceeded at any time during the working day. 

If applicable, exposure limits are listed in this section of the MSDS. The OSHA permissible exposure limit (PEL) is a legal, regulated standard. Other limits may also be listed. These include recommended exposure limits (REL) from the National Institute for Occupational Safety and Health (NIOSH) and threshold limit values (TLV) from the American Conference of Governmental Industrial Hygenists (ACGIH). Sometimes, short-term exposure and/or ceiling limits are shown. The ceiling limit should never be exceeded. 

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