Filter Pack
Filter Pack
Filter Pack
Filter Pack
Filter Pack
Filter Pack

Details

Each mask uses a replaceable 4-ply filter that has been tested to block microparticles at over 98% efficiency. Our filters are custom-fitted to the G-Series Masks and should be replaced after 32 hours or one week, whichever comes first. Order these in different quantity packs to fit your needs.

Filter Pack

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Details

Each mask uses a replaceable 4-ply filter that has been tested to block microparticles at over 98% efficiency. Our filters are custom-fitted to the G-Series Masks and should be replaced after 32 hours or one week, whichever comes first. Order these in different quantity packs to fit your needs.

Product Features
Replaceable 4ply filters. Lasts 32 hours of direct use.
Over 98% filtration score on NaCl lab test (Nelson Labs)
Custom-fitted tear-drop shape for G-Series Mask

Disclaimer: In no event shall CastleGrade™ be liable for any direct, indirect, punitive, incidental, special consequential damages, to property or life, whatsoever arising out of or connected with the use or misuse of our products.

Please Note: No respirator can protect 100% against COVID-19 or other viruses. COVID-19 is not yet fully understood. We cannot and do not guarantee that our respirators will protect you against the Coronavirus.

CastleGrade Filter materials
Replaceable Filters

4 Protective Layers

Each G-Series Mask uses a replaceable 4-ply filter that has been tested to block microparticles at over 95% efficacy. The mask has no valves or vents.

Our filters are custom-fitted to the G-Series Masks and should be replaced either weekly or after 32 hours of direct use. When in use, the filter's blue side (PP Meltblown) should be facing in towards you.

Lab Tested Reuse for 32 hours Buy in Bulk
Nelson Labs USA (8.13.20)

Passed NaCl test

Filtration Efficiency

98% Filtration

Particle Penetration

< 2% Penetration

Protects against Smoke

Charcoal Filters

Introducing our activated carbon filters that aid in removing toxins from smoke and fumes. These 4-ply filters have been lab tested to show over 98% filtration efficiency with less than 1% particle penetration.

98% efficiency Filters smoke Activated Carbon
Learn More

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Registrations

Provisional Patent

U.S. Patent & Trademark Office
  • CastleGrade makes superior masks that actually allow you to breathe comfortably and if you wear glasses they do not “fog up”.

    Martha Stewart

Frequently asked questions

Entrepreneur and business owner Anna Grinvald invented an earlier version of the G-Series in December. Anna’s mother lives in a senior care center in Israel and complained about how typical masks were fogging up her glasses. Ron Grinvald, a former injection mold specialist for several parts on the NASA spacesuit worked with Anna and eventually Dan Castle, owner of Castle Brand Group to improve it. The G-Series filter has recently been tested by Nelson Labs, Alpha Labs and SMQ Labs and has performed extraordinarily well.

The G-Series filter has been tested by several third-party labs. Results from these tests have shown a level of filtration efficiency over 95% consistently, with Nelson Labs performing the Bacterial Filtration Efficiency (BFE) test which returned a 99.8% efficiency score.

Please click on the Science tab to learn more.

As a standard, we recommend purchasing the G9 size. The G8 size is recommended for teenagers and women with small head and face features (70pct of women prefer G9).

Remove the 4-ply filter and place it in the dishwasher. You can also submerge it in boiling water for 2 seconds. If you prefer to keep it clean throughout the day you can wipe it down with any disinfectant.

You can wear the mask for up to 1 week or 32 hours of direct use, before replacing the filter.

Wearing a high protective, silicone mask will slightly alter / muffle the sound of your voice.

We manufacture in several countries including Vietnam, Czech Republic, Germany and China.

Don’t! Keep the mask and buy replacement filters on our website when you are running low or sign up for the subscription so you never run out. We cringe seeing so many masks being discarded after just one day of usage and Mother Nature needs your help.

For safety purposes, once the product has shipped, we consider the mask unfit for use by another customer. Thank you for understanding.