NATO to GOST & GOST to NATO (RD40x1/7-KR40H4) Adapter Set

thingiverse

NATO to GOST (RD40x1/7-KR40H4) & GOST to NATO (KR40H4-RD40x1/7) Adapter Set ==================================================================== This prototype design for 40MM NATO (RD40x1/7”) to GOST 8762-75 (KR40H4), and reversed GOST to NATO, gas mask thread conversion set. Designed to help cross compatibility of commercial off the shelf (COTS) filters with other manufacturer’s respirators during this global PPE shortage. Part Description: ============= NATO_TO_GOST_COUPLER_GEN1.stl GOST_TO_NATO_COUPLER_GEN1.stl Initial model release of two-part 40MM NATO (RD40x1/7) to GOST 8762-75 (KR40H4) and reversed GOST to NATO coupling set. Disclaimers/Risks: ============== 1.) Use Proper Gaskets Requires 40 mm OD gasket or o-ring on the interior RD40x1/7 or GOST 8762-75 pocket to ensure proper seal maintained between cartridge and threads. 2.) Perform Proper Negative Pressure Test Follow SSPs established by your institution or workplace for further guidance. But in general, don your respirator, adjust straps till taught against face, ensuring no obstructions around the periphery of the seal against face either due from hair, facial hair, or otherwise. Exhale deeply. Cover all inhalation ports. (Typically, most full face or half face respirators have two filters, so cover those intake ports with your hands. If your running only one filter, ensure the opposite port has filter cap in place.) Now inhale deeply. The mask should suck tightly against your face without any air leakages. Re-test if adjustments are required at gasket/o-ring interfaces at the adapter. 3.) Use At Own Risk – Temporarily Solution Only Until Supply Chain Normalizes 3D printing materials are not resistant to many solvents, are water soluble, and degrade when exposed to chemicals, heat, and UV/sunlight. 3D printing this adapter is only a temporarily ad-hoc solution against biological contagions. In addition to using a properly calibrated 3D printer, due to tolerances of adapters, if possible perform hot nozzle pass on all exterior surfaces, to reduce surface porosity. Highly recommended users apply a thin layer of polyurethane clear coat on all exterior surfaces, spray or dip based methods, to help resiliency and durability for repeated sterilization and to reduce fomite transmission in printed infill layers. Once supply chains return to normal, users should purchase OEM OSHA/NIOSH/EN standard approved respirators, adapters and accessories for their institution and workplaces. Dev. Notes: ======== 04/28/2020 - Initial model release. In work, pending support 3D printing community for any fitment and model revisions.