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Originally issued by Ministry of Labour Notification No. 19 of March 30, 1988
Latest Amendments: Ministry of Labour Notification No. 120 of December 25, 2000
Test particulate Particulate
Sodium chloride (NaCl)
Dioctyl phthalate (DOP)
Particulate size
From 0.06µm to 0.1µm
From 0.15µm to 0.25µm
Concentration
Lower than 50mg/m3
Lower than 100mg/m3
Flow rate  
85LPM
85LPM
Particulate filtering efficiency (the particulate filtering efficiency of the respirator through the test duration shall exceed the value described each in the right column of the Table on the right, according to the type of the respirator described in the left column of the same Table).  
In case where the test particulate is sodium chloride, filtering efficiency is measured until the cumulative sodium chloride supplied to the respirator reaches at 100mg.
In case where the test particulate is dioctyl phthalate, filtering efficiency is measured until the cumulative dioctyl phthalate supplied to the respirator reaches at 200mg.
Replaceable particulate respirator
RS1
Over 80.0%
RL1
Over 80.0%
RS2
Over 95.0%
RL2
Over 95.0%
RS3
Over 99.9%
RL3
Over 99.9%
Disposable particulate respirator
DS1
Over 80.0%
DL1
Over 80.0%
DS2
Over 95.0%
DL2
Over 95.0%
DS3
Over 99.9%
DL3
Over 99.9%
 
Test of inhalation resistance
(Flow rate at 40LPM)
Replaceable particulate respirator
Disposable particulate respirator
RS1 RL1
Below 70Pa
DS1 DL1
Below 60Pa (below 45Pa)
RS2 RL2
Below 80Pa
DS2 DL2
Below 70Pa (below 50Pa)
RS3 RL3
Below 160Pa
DS3 DL3
Below150Pa (below 100Pa)
( ) denotes those without exhalation valve
Test of exhalation resistance
(Flow rate at 40LPM)
Replaceable particulate respirator
Disposable particulate respirator
RS1 RL1
Below 70Pa
DS1 DL1
Below 60Pa (below 45Pa)
RS2 RL2
Below 70Pa
DS2 DL2
Below 70Pa (below 50Pa)
RS3 RL3
Below 80Pa
DS3 DL3
Below 80Pa (below 100Pa)
( ) denotes those without exhalation valve
Test of air tightness of exhalation valve at work
* The inner pressure must quickly decrease when the inner air is drawn.
* The time required for the inner pressure to be restored up to normal pressure must be longer than 15 seconds.
Test of carbon dioxide concentration increase in inspired air
The difference of carbon dioxide concentration in the inspired air between the conditions with and without the facepiece on the dummy head must be lower than 1.0%.
Dead space
Value calculated from the result of the test of carbon dioxide concentration increase in inspired air
Increased value of inhalation resistance
Test particulate
Sodium chloride (NaCl)
Flow rate After test particulate is being accumulated on the respirator at a flow rate of 85LPM, increased value of inhalation resistance is measured at a flow rate of 40LPM.
Amount of test particulate to be accumulated on the respirator prior to measurement 100mg

Brief explanation on terminology
Particulate Filtering Efficiency
The values, expressed in percentage, show how much particulates the respirator (filter) can capture. Generally speaking, filtering performance is better as the value increases, but inhalation resistance increases at the same time.

Inhalation Resistance
This is a criterion showing how easy the wearer can inhale while donning the respirator. Breathing is easier as the value decreases.

Exhalation Resistance
As opposed to inhalation resistance, this is a criterion showing how easy the wearer can exhale while donning the respirator. Breathing is easier as the value decreases.

Air Tightness of Exhalation Valve at Work
This is a test to confirm if the exhalation valve attaches firmly on the exhalation valve seat. As the inner pressure is negative, external air leaks to the inside unless firmly attached.
  Carbon Dioxide Concentration Increase in Inspired Air
This is a test to confirm if the difference of carbon dioxide concentration in inspired air with the respirator installed on dummy head is within 1% compared to the one without the respirator.

Dead Space
This is the value calculated from the result of the test of carbon dioxide concentration increase in inspired air. The value also represents effective volume inside the respirator as it is being donned on face. As the value decreases (effective volume is smaller), concentration level of carbon dioxide decreases because air inside the respirator circulates more effectively.

Increased Value of Inhalation Resistance
The value shows how much inhalation resistance increases after a known amount of particulates is being captured by the filter. The smaller the value is, the longer the respirator can be used.
 
Selection of particulate respirators appropriate for particulate working environment
Description of particulates and corresponding works
Required performance categories of particulate respirators
Particulate respirators used in the environment where there is a possibility of exposure to particulates, such as dioxin, during the work of waste material incineration.
Ordinance on Industrial Safety and Health, Article 592-5
Working environment without oil mist RS3 RL3
Working environment with oil mist RL3
Particulate respirators used in the working environment with a possibility of exposure to radioactive materials due to spillage or related emergency works.
Ordinance on Prevention of Ionizing Radiation Hazards, Article 38
Working environment without oil mist RS3 RL3
Working environment with oil mist RL3
Particulate respirators used in the working environment where metal fume (including welding fume) diffuses.
Ordinance on Prevention of Lead Poisoning, Article 58
Ordinance on Prevention of Hazards Due to Specified Chemical Substance, Article 43
Ordinance on Prevention of Hazards Due to Dust, Article 27
Working environment without oil mist RS2 RS3 DS2 DS3
RL2 RL3 DL2 DL3
Working environment with oil mist RL2 RL3 DL2 DL3
Particulate respirators used in the working environment where particulates, with the standard control concentration level of 0.1mg/m3 or less, diffuse.
Ordinance on Prevention of Lead Poisoning, Article 58
Ordinance on Prevention of Hazards Due to Specified Chemical Substance, Article 43
Working environment without oil mist RS2 RS3 DS2 DS3
RL2 RL3 DL2 DL3
Working environment with oil mist RL2 RL3 DL2 DL3
Particulate-related works except for the above. Working environment without oil mist RS1 RS2 RS3 DS1 DS2 DS3
RL1 RL2 RL3 DL1 DL2 DL3
Working environment with oil mist RL1 RL2 RL3 DL1 DL2 DL3
 
 
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