40MM NATO (RD40X1/7) to JSP® Force™8 Filter Adapter

thingiverse

40MM NATO (RD40X1/7) to JSP® Force™8 Filter Adapter ============================================= This prototype design for a 40 MM NATO (RD40x1/7), gas mask thread, to JSP® Force™ 8 filter adapter. The adapter is unique from other adapters by allowing users to clock the position of the bayonet/cartridge separate from the RD40x1/7 threads. This adapter makes any RD40x1/7 threaded full face CBRN masks compatible with JSP® Force™8 line of chemical, combination, and particle filter cartridges to help mitigate PPE shortages by expanding greater cross compatibility of respirators and filters to other manufacturer models. Part Description: ============= 40MM_TO_JSP_FORCE_8_ADAPTER_MONO_GEN1.stl Single piece construction adapter, for JSP® Force™ 8 filters that may not require clocking. 40MM_TO_JSP_FORCE_8_ADAPTER_OUTERSHELL_GEN1.stlstl 40MM_TO_JSP_FORCE_8_ADAPTER_INNERHELL_GEN1.stlstl 40MM_TO_JSP_FORCE_8_ADAPTER_INNERSHELL_THREADED_BASE_GEN1.stl Three-piece construction, for clocking purposes of filter cartridges. Recommended that after assembly, user apply thread locker on the inner shell threaded base assembly. Since the JSP® mating geometry OD is larger than RD40x1/7, a three piece construction was required to achieve the same functionality of previous designed line of RD40x1/7 clocking adapters. Disclaimers/Risks: ============= 1.) Use Proper Gaskets It would appear that the JSP® line of respirators has the bayonet/filter mating surfaces interestingly reversed, the gasket is on the filter side, all that is required is to ensure gasket on the JSP® filter side and gasket in the RD40x1/7 mask or female adapter. 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: ========== 04/17/2020 - Initial model release. I do not have any JSP® series respirators or filters to check measurements, so please report back in comments for any fitment issues and I’ll release revisions as required. Credits: ====== Thanks to Ruszel and BigFootPL for publishing there JSP end caps and adapters that allows the 3D printing community to reference regional specific PPE bayonet geometry. United we stand as we combat this global PPE shortage together!