About the Filter
Our G-Series Masks use a 4-ply filter composed of 4 layers of filtration materials. The mask has no valves. When in use, the filter's blue side (PP Meltblown) should be facing in towards you.
The G-Series filter has been lab tested by several third-party labs. Results from these tests have shown a level of filtration efficiency score considerably higher than 95% across multiple lab tests.
NELSON LABS (8.13.20)
Passed NaCl Test
< 2% Penetration
About the Mask
The CastleGrade G-Series Masks use a patent-pending design made from a soft, form-fitting silicone base. The mask forms a natural self-suction seal.
Reusable & Sustainable
Looking Forward For Solutions
Single-use plastics and protective gear is a problem. We strive to have our products truly embody a mindset of sustainability.
Our G-Series masks are reusable, thereby decreasing overall waste and minimizing the impact on our environment.
The Stone Bag
Our G-Series Masks and Replaceable Filters come safely sealed and packaged in the CastleGrade™ “Stone Bag”.
The packaging will completely biodegrade in 14 months and does not need to be recycled.
Safety & Comfort
What Sets Us Apart
The G-Series Masks offer a best-in-class level of protection, while providing a comfortable, reusable product that you can wear everyday.
Patent on Reusable Silicone Mask
USPTO Patent #10,974,084
Efficiently protects against microparticles
Tests have shown the filter has 95% efficiency
Soft, form-fitting design with high breathability
The silicone base allows for all-day comfort
Eco-friendly materials, reusable design
Reuse the mask daily, just change filters
Easily cleaned by wiping with disinfectant
Sterilized with boiling water or 75% alcohol
Mask fits with glasses comfortably, no fog
Wear without having your glasses fog up