Specification
Version: 1.0 
Revision Date: 03/28/2016 
000000023874 
7/18 
Calcium Carbonate 
(Limestone) - 
Respirable fraction. 
TWA    3 mg/m3 Canada. British Columbia OELs. 
(Occupational Exposure Limits for 
Chemical Substances, Occupational 
Health and Safety Regulation 296/97, 
as amended) (07 2007) 
Calcium Carbonate 
(Limestone) - Total 
dust. 
TWA    10 mg/m3 Canada. Quebec OELs. (Ministry of 
Labor - Regulation Respecting the 
Quality of the Work Environment) (12 
2008) 
Polyethylene - 
Respirable fraction. 
TWA    3 mg/m3 Canada. British Columbia OELs. 
(Occupational Exposure Limits for 
Chemical Substances, Occupational 
Health and Safety Regulation 296/97, 
as amended) (05 2013) 
Polyethylene - Total 
dust. 
TWA    10 mg/m3 Canada. British Columbia OELs. 
(Occupational Exposure Limits for 
Chemical Substances, Occupational 
Health and Safety Regulation 296/97, 
as amended) (05 2013) 
Polyethylene - 
Respirable particles. 
TWAEV    3 mg/m3 Canada. Ontario OELs. (Control of 
Exposure to Biological or Chemical 
Agents) (11 2010) 
Polyethylene - 
Inhalable 
TWAEV    10 mg/m3 Canada. Ontario OELs. (Control of 
Exposure to Biological or Chemical 
Agents) (11 2010) 
Polyethylene - Total 
dust. 
TWA    10 mg/m3 Canada. Quebec OELs. (Ministry of 
Labor - Regulation Respecting the 
Quality of the Work Environment) (11 
2011) 
Heavy aromatic 
naphtha - Non-aerosol. 
- as total hydrocarbon 
vapor 
TWA   200 
mg/m3
Canada. British Columbia OELs. 
(Occupational Exposure Limits for 
Chemical Substances, Occupational 
Health and Safety Regulation 296/97, 
as amended) (05 2013) 
Heavy aromatic 
naphtha - Non-aerosol. 
- as total hydrocarbon 
vapor 
TWAEV   200 
mg/m3
Canada. Ontario OELs. (Control of 
Exposure to Biological or Chemical 
Agents) (11 2010) 
Heavy aromatic 
naphtha  
TWA  400 ppm  1,590 
mg/m3
Canada. Quebec OELs. (Ministry of 
Labor - Regulation Respecting the 
Quality of the Work Environment) (11 
2011) 
1,2,4-Trimethylbenzene   TWA  25 ppm    Canada. British Columbia OELs. 
(Occupational Exposure Limits for 
Chemical Substances, Occupational 
Health and Safety Regulation 296/97, 
as amended) (07 2007) 
1,2,4-Trimethylbenzene   TWAEV  25 ppm    Canada. Ontario OELs. (Control of 
Exposure to Biological or Chemical 
A
g
ents
)
(
11 2010
)
1,2,4-Trimethylbenzene   TWA  25 ppm  123 
mg/m3
Canada. Quebec OELs. (Ministry of 
Labor - Regulation Respecting the 
Quality of the Work Environment) (12 
2008) 
4,4'-Methylene CEILING  0.01 ppm    Canada. British Columbia OELs. 










