Koken Dust Mask Options

Manufacturer: KOKEN LTD.

Important points when wearing a respirator

Dust respirators use high-efficiency filters to prevent the inhalation of hazardous dust. To protect yourself from inhaling dust when wearing a dust respirator, the performance of this filter and the “tight seal” (fit) between the mask and your face are extremely important.

1. Filter Technology with High Particle Collection Efficiency

Mighty (Uni) Micron Filter
Through unique technology, the sheep wool is electrostatically charged, and this electrostatic force draws particles to the fiber surface. This is the primary mechanism for collecting particles. A high-density fiber structure is not required, thus integrating the two contrasting features of “high collection efficiency” and “low inhalation resistance.”

It consistently maintains the highest standard of performance and quality, and has been utilized for a long time as an outstanding filter.

Applicable products are on P.4 ~ 6, P.11

Alpha Ring Filter

Increasing the filter’s fiber density improves collection efficiency. To meet airflow resistance standards, paper filters require an expanded surface area.

For the first time in Japan, ultra-fine fibers were formed into a pristine circular shape in a single process to create the Alpha Ring filter. Today, this filter continues to succeed in expanding the surface area while maintaining a compact shape, significantly reducing airflow resistance.

Applicable products are from P.8 to P.11

Dust Respirator Standards

In addition to JIS standards, dust respirators are tested according to national assay standards based on national regulations. The contents of these standards are comprehensive, ensuring the manufacture of products that meet strict safety requirements.

Dust Respirator Standards	In addition to JIS standards, dust respirators are tested according to national assay standards based on national regulations. The contents of these standards are comprehensive, ensuring the manufacture of products that meet strict safety requirements.

Note: The table below is excerpted from the “Dust Respirator Standards”.

Disposable Dust Respirator
Replaceable Dust Respirator	Isolation Type Dust Respirator
Replaceable Dust Respirator	Direct Connection Type Dust Respirator

Inhalation Resistance (Test flow rate 40 ℓ/min)	Replaceable Type			Disposable Type
Test Aerosol	Type	NaCl (Sodium Chloride) particles		DOP (Dioctyl Phthalate) particles
	Particle Size	0.06 μm to 0.1 μm		0.15 μm to 0.25 μm
	Concentration	50mg/m³ or less		100mg/m³ or less
Test Flow Rate		85 ℓ/min		85 ℓ/min
Particle Collection Efficiency (Continuous measurement, must meet the value in the right column)		For NaCl test aerosol Loaded up to 100mg		For DOP test aerosol Loaded up to 200mg
	Replaceable Type	RS1	80.0% or more	RL1	80.0% or more
		RS2	95.0% or more	RL2	95.0% or more
		RS3	99.9% or more	RL3	99.9% or more
	Disposable Type	DS1	80.0% or more	DL1	80.0% or more
		DS2	95.0% or more	DL2	95.0% or more
		DS3	99.9% or more	DL3	99.9% or more
	RS1　RL1		70Pa or less	DS1　DL1	60Pa or less (45Pa or less)
	RS2　RL2		80Pa or less	DS2　DL2	70Pa or less (50Pa or less)
	RS3　RL3		160Pa or less	DS3　DL3	150Pa or less (100Pa or less)
Exhalation Resistance (Test flow rate 40 ℓ/min)	Replaceable Type			Disposable Type
	RS1　RL1		70Pa or less	DS1　DL1	60Pa or less (45Pa or less)
	RS2　RL2		70Pa or less	DS2　DL2	70Pa or less (50Pa or less)
	RS3　RL3		80Pa or less	DS3　DL3	80Pa or less (100Pa or less)

( ) indicates products without an exhalation valve.

Exhalation Valve Airtightness	Exhalation valve operation leak test	– When air is drawn, the internal pressure must decrease immediately – The time for internal pressure to return to normal atmospheric pressure must be 15 seconds or more
Carbon Dioxide (CO2) Concentration Increase	Using a test headform and an artificial lung to inhale/exhale air containing CO2. The difference in CO2 concentration in the inhaled air between wearing and not wearing the mask must be 1.0% or less.
Dead Space Volume	Calculated from the (Carbon Dioxide Concentration Increase Test)

Inhalation Resistance Increase	Test Aerosol	NaCl (Sodium Chloride)
	Test Flow Rate	Measured at 40 ℓ/min after loading test dust at 85 ℓ/min
	Amount loaded onto dust respirator	100mg

Test Aerosol and Collection Efficiency Disposable Type / Replaceable Type		S	L	Classification (Particle Collection Efficiency)
		Test aerosol is solid Sodium Chloride (NaCl)	Test aerosol is liquid Dioctyl Phthalate (DOP)	Classification (Particle Collection Efficiency)
R	Replaceable Dust Respirator	RS1	RL1	Class 1 (80.0% or more)
		RS2	RL2	Class 2 (95.0% or more)
		RS3	RL3	Class 3 (99.9% or more)
D	Disposable Dust Respirator	DS1	DL1	Class 1 (80.0% or more)
		DS2	DL2	Class 2 (95.0% or more)
		DS3	DL3	Class 3 (99.9% or more)

High-Performance Filter + Facepiece Designed for Easy Fit

2. Facepiece Fit Technology

Even if a dust respirator has a high collection efficiency filter, it is meaningless if dust leaks through the face-to-mask seal during use. This is primarily caused by a “gap at the face contact area when worn.”

We consider mask fit to be just as important as filter performance. Therefore, our company has long developed technologies to enhance the airtightness of the facepiece seal.

Silicone Facepiece
Silicone is a hypoallergenic material that is gentle on the skin. Its surface is flexible and effortlessly adapts to facial movements, ensuring a comfortable fit. The material also remains stable during use.

HAWC Lip Structure
The lip design ensures a high degree of adhesion, maximizing the “suction cup” effect when wearing the mask to ensure an airtight facial seal.

Free Position Under Chin
The unique curve of the face contact area prevents dust from leaking in. By aligning the nose portion first, it accommodates various facial dimensions, providing a secure fit for a wide range of face sizes (see image below).

Fit Status of the Free Position Under Chin Mask
(Simulated image with the mask cut away to clearly show where it contacts the chin).

For individuals with large faces:
The outer section of the mask rests naturally against the chin to provide a proper fit.

For individuals with small faces:
The inner section of the mask naturally positions itself against the chin to secure the fit.

FF Lip		Wearing Stability		Built-in Fit Checker
	Designed to naturally conform to various facial sizes and shapes, providing a seamless fit.		Uses a 3D-shaped polyband harness that conforms to the shape of the head, cradling it to enhance fit and sealing performance.		A built-in fit checker allows you to test the mask’s seal at any time (available for the 1005, 1010A, 1015, and 1180 series).

Optional Accessories (Replaceable Dust Respirators)

Moisture Sponge

Use this when you feel discomfort due to moisture (sweat, breath condensation) accumulating inside the mask. (Disposable type)

Egg-shaped Moisture Sponge (50 pcs/pack)	Type A Moisture Sponge (For Bonnet types) (10 pcs/pack)

Inhalation Port Cover

This cover minimizes the direct entry of flying objects into the filter. It is suitable for tasks generating significant spatter (welding slag) or sparks.

Inhalation Port Cover (2 pcs/pack).

Cannot be attached to the following models: 1005 Series, 1010A, Model 1015, Hi-Luck Series.

Visor Cover (Lens Protector)

This cover protects the mask’s visor lens from scratches and dust accumulation.


Visor Cover for H-VII (10 pcs/pack) Compatible models: Model 1521H, 1521U.	Visor Cover for H-VII Type A (10 pcs/pack) Compatible models: Model 1521H, 1521U.	Visor Cover for HV (5 pcs/pack) Compatible models: Model 1721H, 1781DW, 1781DWC.

Dedicated Glasses for Full-Face Masks

If you require vision correction (e.g., for nearsightedness/farsightedness), the use of these dedicated glasses is mandatory.

Glasses for High Scope V Series
Compatible models: Model 1721H, 1781DW, 1781DWC.

Dedicated Glasses Clip for Full-Face Masks

For the High Scope VII series masks, you can wear your everyday prescription glasses by combining them with this dedicated glasses clip.

Glasses Clip Type A
Compatible models: Model 1521H, 1521U.

Fit Test Adapter

Used when conducting quantitative fit testing with measurement equipment.
*Please use the dedicated sampling adapter corresponding to each specific mask model.

KBC Filter

This is an auxiliary filter that removes Ozone odors generated during welding and neutralizes odors from organic solvents (at levels below the permissible limit).


KBC Filter for 1005 Series Compatible models: Model 1005RR, 1005RRX.	KBC Filter for 1021/1091 Series Compatible models: Model 1021R, 1021RX, 1091D.	KBC Filter for 1121/1191 Series Compatible models: Model 1121R, 1121RX, 1191SD, 1191D, 1122R.