Sundstrom SR900 Respirator to 40MM NATO (RD40x1/7) Adapter

thingiverse

Sundstrom SR900 Respirator to 40MM NATO (RD40x1/7) Adapter ===================================================== This prototype design is a Sundström SR900 series respirator to 40MM NATO (RD40x1/7”) gas mask thread adapter. It provides an alternative attachment method for the SR900, which has an internal bayonet system unlike the SR100/SR200 line. Designed to enhance cross compatibility of commercial off-the-shelf (COTS) filters with other manufacturer’s respirators during this global PPE shortage. Sundström SR900 series respirators can now be compatible with any RD40x1/7” threaded canisters or step-down adapters to other respirator manufacturer filter cartridges. Note that Sundström SR200 series are already factory-threaded for RD40, requiring only the removal of the OEM filter adapter. If you cannot source 40MM NATO (RD40x1/7”) thread filters, you can step down to the following adapters: * 40 MM NATO to 3M Filter Adapter https://www.thingiverse.com/thing:4245358 * 40MM NATO to Scott 742 Series Filter Adapter https://www.thingiverse.com/thing:4347531 * 40 MM NATO to MSA Bayonet Filter Adapter https://www.thingiverse.com/thing:4265715 * 40MM NATO to MSA Comfo Classic Filter Adapter https://www.thingiverse.com/thing:4281612 And if no filter cartridges are still available, there are many DIY filter solutions on thingiverse that are compatible with each of the major manufacturer’s respirators. Part Description: ================ SUNDSTROM_SR900_SERIES_TO_40MM_NATO_ADAPTER_GEN1.stl Initial model release. Disclaimers/Risks: ================ 1.) Use Proper Gaskets Requires 40 mm OD gasket or o-ring on the interior pocket for RD40x1/7 threads. Requires adapter to respirator gasket. https://www.srsafety.com/us/gasket-r01-3004.html Requires inhalation gasket. https://www.srsafety.com/us/inhalation-membrane-for-sr-900-r01-3010.html 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 you're running only one filter, ensure the opposite port has a 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: ========== 05/03/2020 - Initial model release. In work, pending 3D printing community support for any fitment and model revisions. Credits: ====== Thanks to polandmet1 for his Sundström SR900 face mask to 3M adapter design. https://www.thingiverse.com/thing:4261604