The Standard for Dust Mask has
been enacted as follows conforming to and in order to enforce the Industrial
Safety and Health Law (Law No. 57 of 1972).
Contents
(Type of Dust Mask)
Article 1
Dust mask, described in Article 13 Part 5 of the Enforcement Order of
Industrial Safety and Health Law (Cabinet Order No. 318, 1972) shall be
categorized, according to the form described on the right column of the
following Table, into the type described on the left column of the same
Table.
|
Type
|
Form
|
|
Replaceable type dust
mask
|
Front or
back mounted type
dust mask
|
It is composed of a filter cartridge, a breathing tube, an inhalation valve,
a facepiece, exhalation valve(s) and head harness. Clean air filtered
by the filter cartridge is inhaled from the inhalation valve through the
breathing tube and exhaled air is exhausted from the exhalation valve(s)
to outside atmosphere.
|
|
Directly connected dust
mask
|
It is composed of filter cartridge(s),
inhalation valve(s), a facepiece , exhalation valve(s) and head harness.
Clean air filtered by the filter cartridge is inhaled from the inhalation
valve, and exhaled air is exhausted from the exhalation valve(s) to
outside atmosphere.
|
|
Disposable type dust mask
|
It is composed of a filter
united with a facepiece and head harness. Clean air filtered by the
filtering facepiece is inhaled, and the exhaled air is exhausted through
the filtering facepiece or through both of an exhalation valve and the
filtering facepiece if the filtering facepiece involves an exhalation
valve.
|
2 The facepiece of dust mask shall be categorized, according to the
shape described in right column of the following Table, into types described
in left column of the same Table.
|
Type
|
Form
|
|
Full-face facepiece
|
It covers whole face.
|
|
half mask facepiece
|
It covers only nose and
around mouth.
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3 Dust mask shall be categorized, according to the performance, i.e.
each replaceable type dust mask into RS1, RS2, RS3, RL1, RL2 and RL3, and
each disposable type dust mask into DS1, DS2, DS3, DL1, DL2 and DL3.
(Materials)
Article 2
The materials to be used for each part of dust mask shall conform to
the requirements described in the following items.
1. The material used at the part tightly
contacted with face must give no harm on the skin.
2. The filter material must give no harm
to human body.
3. The material used must be strong enough not to be defected to give
tear or distortion by ordinary application.
(Test on Strength)
Article 3
The individual part of dust mask shall conform to the requirements
described in the right column of the following Table, when it is subject
to the tests described in the middle column of the same Table, according
to the category described in the left column of the same Table.
|
Category
|
Testing Procedures
|
Conditions
|
|
Head harness and its mounting
base
|
(Pulling Test)
Each combination of head
harness and its mounting base is pulled with tension force of 50 Newton
for full-face type facepiece, with tension force of 25 Newton for half
mask facepiece and with tension force of 10 Newton for disposal dust
mask, and investigated whether breakage or separation is caused..
|
Breakage or separation
on both parts must not be caused.
|
|
Breathing tube and its mounting base of front or back mounted type
dust mask
|
(Pulling Test)
Breathing tube and its
mounting base are pulled with tension force of 98 Newton and investigated
whether breakage or separation is caused.
|
Breakage or separation
must not be caused.
|
(Structure)
Article 4
The structure of dust mask shall conform to the requirements
shown in the following each item.
1. It must be not easy to break.
2. It must be easy to wear, and not to
give a pressed feeling or pain when being worn.
3. The dead space must not be too large.
4. It must not remarkably narrow the visual
field of the wearer.
5. The respirator having full-face type
facepiece should not be dimmed at eyepiece(s) by exhalation.
6. Those dust mask having replaceable filter
cartridge(s), inhalation valve(s), exhalation valve(s) and head harness should
be so designed that those replaceable parts are easily replaced. And,
the air tightness between face and facepiece can be easily checked anytime
by wearers themselves.
7. On the disposable dust mask, the filtering
facepiece must keep the shape within the service duration without deform.
8. On the disposable dust mask, inward
leakage and wet breathing resistance must not be remarkably high.
9. In the disposal dust mask, if facepiece
is made of the filtering material, it must be formed so that the filtering
facepiece is fitted to face.
Article 5
The individual part of dust mask shall conform to the
requirements described in the right column of the following Table, according
to the part described in the left column of the same Table.
|
Part
|
Requirements
|
|
Inhalation valve
|
It must work reliably
and quickly even for ordinary breathing.
|
|
Exhalation valve
|
1. It
must work reliably and quickly for ordinary breathing, at both wet or dry
condition at valve and valve seat.
2. When
inside and outside pressure of the dust mask is in equilibrium, the exhalation
valve must be kept close tightly, whichever the facepiece is directed to.
3. It
must be protected by cover or alike measures so that damage is not caused
by forces given from outside.
|
|
Head harness
|
1. It
must have appropriate length and elasticity.
2. The
length of harness must be adjustable. However, on the disposable dust mask,
this is not necessarily required as far as the air tightness onto the face
is kept.
|
|
Connecting tube
|
1. It
must have appropriate elasticity for expansion and contraction of length,
and must cause no inconvenience in airflow when it is bent into variety
of forms.
2. It
must cause no problem in airflow when it was pressed by chin or arm.
3. The
length must be long enough to cause no restriction of head movement.
|
(Performance Tests)
Article 6
The performance of dust mask shall conform to the requirements described
in the right column of the following Table when tested according to the
test procedures described in the left column of the same Table.
|
Test procedures
|
Requirements
|
|
(Test of particulate filtering
efficiency)
The particulate filtering efficiency is measured
by the measurements of the particle concentration of the test air flow before
and after it passes the dust mask, and by the succeeding calculation in use of
the following equation. The particle used for the test of particulate filtering
efficiency is chosen either of the following two kinds depending on the kind of
the particulate filter. The particle size distribution of the test particles is
represented by the count median diameter.
Particulate filtering efficiency (%) =
Concentration before passing -
(mg/cubic meter) |
Concentration after passing
(mg/cubic meter) |
X 100 |
 |
Concentration before passing
(mg/cubic meter) |
|
|
|
1. The case where the test particle is sodium chloride;
The concentrations of sodium chloride in the test flow before and after
passing through the dust mask are continuously measured with a sodium chloride
concentration measuring instrument with the light scattering method.
The count median diameter of the particle size of sodium chloride shall
be from 0.06 micrometer to 0.10 micrometer and the geometrical standard
deviation of the particle size distribution shall be less than 1.8.
The air flow containing sodium chloride at the concentration lower than
50 mg per cubic meter with the variation range less than 15% is made pass
through the respirator at the flow rate of 85 liters per minute until the
cumulative sodium chloride supplied to the respirator reaches at 100mg.
The particulate filtering efficiency is calculated for the maximum concentration
of sodium chloride after passing the respirator during the test.
|
1. The case where the test particle is sodium chloride;
The particulate filtering efficiency of the respirator through the test
duration shall exceed the value described each in the right column of the
Table below, according to the type of the respirator described in the left
column of the same Table.
|
|
Type
|
Particulate filtering efficiency
(%)
|
|
Replaceable
dust mask
|
RS1
|
80.0
|
|
RS2
|
95.0
|
|
RS3
|
99.9
|
|
Disposable
dust mask
|
RS1
|
80.0
|
|
RS2
|
95.0
|
|
RS3
|
99.0
|
|
2. The case where the test particle is dioctyl phthalate;
The concentrations of dioctyl phthalate in the test flow before and after
passing through the dust mask are continuously measured with a dioctyl
phthalate concentration measuring instrument with the light scattering
method. The count median diameter of the particle size of dioctyl
phthalate shall be from 0.15 micrometer to 0.25 micrometer and the geometrical
standard deviation of the particle size distribution shall be less than
1.6. The air flow containing dioctyl phthalate at the concentration
lower than 100 mg per cubic meter with the variation range less than 15%
is made pass through the dust mask at the flow rate of 85 liters per minute
until the cumulative dioctyl phthalate supplied to the respirator reaches
at 200mg. The particulate filtering efficiency is calculated for
the maximum concentration of dioctyl phthalate after passing the respirartor
during the test.
|
2. The case where the test particle is dioctyl phthalate;
The particulate filtering efficiency during the test duration
shall be exceeding the value described each in the right column of the
Table below, according to the type of the respirator described in the
left column of the same Table.
|
|
Type
|
Particulate filtering efficiency (%)
|
|
Replaceable
dust mask
|
RL1
|
80.0
|
|
RL2
|
95.0
|
|
RL3
|
99.9
|
|
Disposable
dust mask
|
DL1
|
80.0
|
|
DL2
|
95.0
|
|
DL3
|
99.0
|
|
(Test of inhalation resistance)
This test measures the difference between inner and outer pressure of the
dust mask on a dummy head during passing air flow at the rate of 40 liters
per minute in the direction of inhalation. (This pressure difference is
hereafter called as "inhalation resistance" in this Table.)
|
The inhalation resistance
shall not exceed the values described in the right column of the Table
below, according to the type of the dust mask described in the left
column of the same Table.
|
|
Type
|
Inhalation Resistance
(Pascal)
|
|
Replaceable
dust mask
|
RS1 and RL1
|
70
|
| RS2 and RL2 |
80
|
| RS3 and RL3 |
160
|
|
Disposable
dust mask
|
DS1 and DL1
|
60
45 for those without exhalation
valve
|
| DS2 and DL2 |
70
50 for those without exhalation
valve
|
| DS3 and DL3 |
150
100 for those without
exhalation valve
|
|
(Test of exhalation resistance)
This test measures the difference between inner and outer pressure of the
dust mask mounted on exhalation resistance test equipment when an air flow
is passed at the rate of 40 liters per minute into the dust mask in the
direction of exhalation. (This pressure difference is hereafter called
as "exhalation resistance" in this Table.)
|
The exhalation resistance
shall not exceed the values described in the right column of the Table
below, according to the kind of the dust mask described in the left
column in the same Table.
|
|
Type
|
Exhalation resistance
(Pascal)
|
|
Replaceable
dust mask
|
RS1 and RL1 |
70 |
|
RS2 and RL2
| 70 |
|
RS3 and RL3
| 80 |
|
Disposable
dust mask
|
DS1 and DL1
|
60
45 for those without exhalation
valve
|
|
DS2 and DL2
|
70
50 for those without exhalation
valve
|
|
DS3 and DL3
|
80
60 for those without exhalation
valve
|
|
(Test of air tightness of exhalation valve at work)
First, the exhalation valve with the valve seat is mounted on an air tightness
test equipment, and then the decrease of the inner pressure of the valve
is confirmed by drawing the inside air by a drawing pump at the rate of
1 liter per minute. Next, the inner pressure is adjusted at -1,470 Pascal
against the atmospheric pressure, and then the drawing of the inner space
of the valve is stopped, and then the time for the inner pressure to recover
to the atmospheric pressure is measured. The capacity of the inner
space of the exhalation valve seat shall be 50 cubic centimeters.
|
1. The inner pressure must quickly decrease when the inner air is
drawn.
2. 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)
In the atmosphere of 25±5°C, the facepiece is put on a dummy
head with the dimensions described in the following picture, and the connected
artificial breathing apparatus is driven at the rate of 15 times a minute
and 2.0±0.1 liters per stroke (The artificial breathing apparatus
supplies exhalation air with 5.0% carbon dioxide.). During this procedure,
the carbon dioxide concentration in the inspired air is measured until
the concentration reaches a constant concentration. The same procedure
is performed with the dummy head without a facepiece.
Dummy Head (in mm)
|
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%.
|
(Labeling and Others)
Article 7 Dust mask shall carry indications
of the items below, at easily observable place.
1. Name of manufacturer
2. Date of manufacture
3. Name of Respirator Type
4. Service time ( Only for disposable dust
mask. )
Dust mask shall be attached with a printed matter describing the
items shown below, when it is transferred or lent.
1. Scope of application
2. Remarks in application
3. Increased value of inhalation resistance
4. Leakage rate (Only for disposable dust
mask.)
5. Wet air-flow resistance (Only for disposable
dust mask.)
6. Procedure for the wearer to check the
air tightness between face and facepiece.
The increased value of inhalation resistance, leakage rate and wet
air flow resistance indicated in the previous Table shall be measured each
by the procedure provided in the items below, with exceptions when other
procedures accepted by the Director General of the Labour Standards Bureau
of the Ministry of Health, Labour and Welfare is applied.
|
1. Increased value of
inhalation resistance
The difference between inner and outer pressure of a respirator put on
a dummy head is measured with an air flow at the flow rate of 40 liters
per minute in the inhalation direction when 100 mg of cumulative sodium
chloride is supplied to the dust mask for the particulate filtering efficiency
test.
2. Leakage rate
Sodium chloride concentration in the inner space of the disposable dust
mask is measured which are worn by each of the ten test persons whose facial
dimensions shall be those shown in the left column and the middle column
of the following table. The person wearing a disposable dust mask
breath at 10 times per minutes for 3 minutes in the air containing sodium
chloride aerosol of which the count median diameter is around 0.5 micrometer
and the concentration is 10 mg ± 2 mg per cubic meter, and the aerosol
concentration inside the respirator is measured. The leakage rate
is calculated by using the following equation.
Leakage rate (%) =
|
Average of sodium chloride concentration in dead space during testing X 2
( mg per cubic meter )
|
X 100 |
|
Sodium chloride concentration in the air outside the respirator
( mg per cubic meter ) |
|
|
Width of lips (cm)
|
Distance between nose base and chin (cm)
|
Number of person
|
|
over 3.5 less than 4.5
over 3.5 less than 4.5
over 3.5 less than 4.5
over 4.5 less than 5.5
over 4.5 less than 5.5
over 4.5 less than 5.5
over 4.5 less than 5.5
over 5.5 less than 6.5
over 5.5 less than 6.5
over 5.5 less than 6.5
|
over 10.5 less than 11.5
over 11.5 less than 12.5
over 12.5 less than 13.5
over 10.5 less than 11.5
over 11.5 less than 12.5
over 12.5 less than 13.5
over 13.5 less than 14.5
over 11.5 less than 12.5
over 12.5 less than 13.5
over 13.5 less than 14.5
|
1
1
1
1
1
1
1
1
1
1
|
|
3. Wet
air flow resistance
The difference between inner and outer pressure of disposable dust mask
is measured after passing air of 40 °C saturated with water vapor through
the disposable dust mask mounted on a dummy head, at the flow rate of 30
liters per minute, in the room of the temperature 25°C ± 5°C.
|
(Exceptions of this Standard)
Article 8
The provisions related to this official announcement are not applied
when the Director General of Labour Standards Bureau of the Ministry of
Health, Labour and Welfare accepted that the dust mask has equivalent or
better performance than dust mask conforming to this standard, regarding
those dust mask of which material, structure or performance is special,
or is used at special conditions, and to which application of the provisions
from Part 1 through Part 6 of this standards are not appropriate.
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