Moldex® 8000 Series to 40MM NATO (RD40x1/7) Adapter

This prototype design for a Moldex® 8000 series snap on, radial connector style, non-disposable respirator to 40MM NATO (RD40x1/7”) gas mask thread adapter. Designed to help cross compatibility of commercial off the shelf (COTS) filters with other manufacturer’s respirators during this global PPE shortage. In this particular case, Moldex® 8000 series respirators can now be compatible with any RD40x1/7” threaded canisters or step down adapters to other respirator manufacturer filter cartridges.

If you cannot source 40MM NATO (RD40x1/7”) threaded filters, then you can step down to the following adapters below:

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:4267676

40MM NATO to MSA® Phalanx Filter Adapter
https://www.thingiverse.com/thing:4399965

40MM NATO to Honeywell/Honeywell North® Filter Adapter
https://www.thingiverse.com/thing:4268775

40MM NATO to Honeywell Sperian® Filter Adapter
https://www.thingiverse.com/thing:4297348

40MM NATO to Honeywell Safety Sperian® /Survivair™ ValuAir® (Bayonet) Filter Adapter
https://www.thingiverse.com/thing:4345345

40MM NATO to AOSafety® Threaded Filter Adapter
https://www.thingiverse.com/thing:4273365

40 MM NATO to AOSafety® R5700 8051 Bayonet Filter Adapter
https://www.thingiverse.com/thing:4265538

40MM NATO to Portwest® Bayonet Filter Adapter
https://www.thingiverse.com/thing:4273464

40MM NATO to Moldex® 7000/9000 Series EasyLock® Bayonet Filter Adapter
https://www.thingiverse.com/thing:4275446

40MM NATO to Secura BC Bayonet Filter Adapter
https://www.thingiverse.com/thing:4294187

40MM NATO to JSP® Force™8 Filter Adapter
https://www.thingiverse.com/thing:4294203

40MM NATO to Delta Plus M3000 Mars Series Filter Adapter
https://www.thingiverse.com/thing:4311197

40MM NATO to Delta Plus M6000 Jupiter Series Filter Adapter
https://www.thingiverse.com/thing:4311200

40MM NATO TO GOST 8762-75 Threaded Filter Adapter
https://www.thingiverse.com/thing:4321450

40MM NATO to Draeger X-plore® Filter (3000/5000 Series) Adapter
https://www.thingiverse.com/thing:4329276

40MM NATO to ENHA Rockman 7300 Series Filter Adapter
https://www.thingiverse.com/thing:4329610

40MM NATO to Sundstrom SR Series Filter Adapter
https://www.thingiverse.com/thing:4338105

40MM NATO to Milla EURMASK® ETNA (Bayonet) Series Filter Adapter
https://www.thingiverse.com/thing:4342320

40MM NATO to Milla EURMASK® (Uno/New) Series Threaded Filter Adapter
https://www.thingiverse.com/thing:4342343

40MM NATO to Spasciani Bayonet (Duetta and Duo) 2000 Series Filter Adapter
https://www.thingiverse.com/thing:4378232

40MM NATO to MEDOP Threaded Filter (EUROPA Comfort Series) Adapter
https://www.thingiverse.com/thing:4380984

And if no filter cartridges are still available to you, then there are many DIY filter solutions on thingiverse that are compatible with each of the major manufacturer’s respirators, for 3M, MSA, etc.

Part Description:

MOLDEX_RADIAL_TO_40MM_NATO_ADAPTER_GEN1.stl

MOLDEX_RADIAL_40MM_INHALATION_GASKET_GEN1.stl

MOLDEX_RADIAL_RD40_THREAD_GASKET_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, and use the provided inhalation gasket, or fabricate using as template, as it would appear that the Moldex® 8000 series respirators have the inhalation gasket on the filter side.

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 for FDM based methods, otherwise SLS/SLA method preferred. 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/conformed respirators, adapters and accessories for their institution and workplaces.

Dev. Notes:

06/03/2020 – Initial model release. In work, pending 3D printing community support for any fitment and model revisions.

Credits:

Thanks to markosaurus for the Moldex® 8000 filter holder design. Used images online and his respirator side geometry, for thickness and depth dimensions to extrapolate the corresponding attachment geometry.
https://www.thingiverse.com/thing:4231138