No, it does not. 

For safety purposes, we recommend that the filter's shelf life be strictly adhered to. Activated carbon degrades over time — we guarantee that so long as all the conditions are adhered to (i.e. storage conditions), the specs we put out on the filters will hold true at the end of its shelf life. Beyond the specified shelf life, we can no longer guarantee its effectiveness.

For safety reasons, we cannot recommend reusing any filter. This would go against all safety standards set out by regulatory agencies all over the world regarding disposable filters.

If you insist on re-using a filter against COVID-19, it would be best to refer to CDC's guidelines. As new information is constantly being released regarding this virus, it would be best to refer to their updates on how long you'll need to quarantine an exposed filter before you can re-use it.

Yes, they will, as both are 40mm NATO threaded.

That depends on a few factors, including the contaminant type, concentration, breathing rate, along with atmospheric conditions. Specifically for CO conversion, this filter is rated for 15 minutes at 5000ppm, which is the standard for smoke escape filters.

Both filters will work on smoke particles and certain gases/vapors that are produced when things burn. The VK-530, however, also contains an oxidizing agent that converts CO into CO₂, allowing you to breathe it out. It has been tested to convert CO for 15 minutes, at a concentration of 5000ppm.

These filters will work with any 40mm NATO threaded mask or NATO threaded converter. I am not sure if your converter meets the EN 148 thread standard. If it does, it should work just fine.

These filters are threaded for 40mm NATO, so they cannot be threaded onto old-style 40mm GOST masks. They can, however, be used with masks that fit the new GOST standard which is 40x3.5mm, same as 40mm NATO.

That depends on where you are flying. Each country has different laws on what can and cannot be imported. As per US regulations, you are allowed to travel with a set of personal protective equipment for personal use.

Filter use time depends on a few factors, including atmospheric conditions, contaminant type, concentration, along with your breathing rate. As a general rule of thumb, we would suggest having two filters per person per day for emergency evacuation purposes.

MIRA Safety filters (NBC-77 SOF, VK-530, DOTpro 320) are classified as "combined filters" and contain a P3 filter along with activated carbon. For those that don't know what P3 means, it is a rating for a particle filter that blocks 99.9999%+ of particulates. As viruses travel in liquid aerosols and particulates, this filter (when coupled with a full face respirator) would prevent the coronavirus from entering your breathing passages and eyes.

We recommend wearing one filter at a time as it's more comfortable and lowers the weight on your face. If you choose to wear two filters simultaneously, your filtration level would be equivalent to the filter that filters the least. In the case of the NBC-77 SOF and VK-530, the NBC-77 SOF does not oxidize CO, so the combo would still let CO into your lungs.