Image available on the official notice.
Koken “Gas respirator model R-5-08, and 3 other products” - Recall
Official notice
5 Nov 2026
Last checked
5 Nov 2026
An official CAA Japan notice concerns Koken “Gas respirator model R-5-08, and 3 other products” - Recall. It has been found that the connection between the retaining ring used to attach the cartridge and the mask body may fit tightly and be difficult to tighten. Reason for the voluntary recall: It has been found that, in some gas respirators on the market, the connection between the retaining ring (*) used to attach the cartridge and the mask body fits tightly and may be difficult to tighten. If used without the retaining ring properly attached, an airtight seal between the mask body and cartridge may not be maintained, potentially affecting the performance of the gas respirator. (*) In products with the confirmed defect, the cartridge is secured to the mask body by tightening the retaining ring, creating an airtight seal between the mask body's gasket and the cartridge. Published 2026-11-05.
What to do now
We apologize for the inconvenience, but if you have an affected product, please contact your nearest sales office or distributor.
Official notice
2026-11-05
The hazard
The hazard
It has been found that the connection between the retaining ring used to attach the cartridge and the mask body may fit tightly and be difficult to tighten. Reason for the voluntary recall: It has been found that, in some gas respirators on the market, the connection between the retaining ring (*) used to attach the cartridge and the mask body fits tightly and may be difficult to tighten. If used without the retaining ring properly attached, an airtight seal between the mask body and cartridge may not be maintained, potentially affecting the performance of the gas respirator. (*) In products with the confirmed defect, the cartridge is secured to the mask body by tightening the retaining ring, creating an airtight seal between the mask body's gasket and the cartridge.
How to check if you're affected
How to check if you're affected
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Affected products
Product 1
Hazard
Where it was sold
Where it was sold
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Location 1
Affected area 1
Company & contacts
Company & contacts
Brand
Manufacturer
Phone
Brand: 興研. Contact: 興研株式会社営業所. Phone 011-212-1527, 022-374-0420, 025-255-0121, 043-293-0411, 048-524-2928, 03-5276-8063, 045-242-6566, 052-753-7872, 076-298-1010, 06-6326-9223, 078-511-0414, 086-423-2321, 082-511-1281, 0897-34-8927, 0942-38-1651.
Source & status
Source & status
Recall details
Recall details
Event id
Source tier
Documents, notices & source
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