G-Series Respirator Masks
The Next Generation of Protection
Our masks are built on the principles of safety, comfort and reusability.
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G-SERIES MASKS
Innovation for real protection
G-SERIES MASKS
Innovation for real protection
Our innovative silicone design provides a comfortable seal that ensures air is filtered both in and out of our 4-ply medical-grade filter, tested at over 95% efficacy.
Easy to sterilise silicone means true reusability, making our masks cheaper than disposable N95 respirators after just 10 days of regular use, while stopping mask waste.
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I received the G-Series. This will be the new standard for the medical industry. It feels like you are wearing a cloud compared to the other masks out there that leave us with daily damage to our skin.
Dr. Lauren Becker DDS
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The triple threat; it offers reliable protection, the design is fire and it is affordable.
An eco-friendly mask with a durable and reusable design. The ergonomic fit is amazing and it does not sacrifice its ONE JOB, to protect. A game changer that fits well with my glasses and have not experienced any fogging.
Hypenurse
Nurse and blogger
Breathe Easier
Everyday Comfort
Breathe Easier
Everyday Comfort
We focused on creating a light, soft and comfortable mask, fit for everyday use. The silicone mask base naturally forms a self-suction seal that doesn’t fog up your glasses and allows you to breathe easier than traditional masks.
95+ efficacy
fog free
Easy to Breathe
Form-Fitted
Eco-Friendly
Easy to Clean
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. Air and microparticles are filtered in 2 directions, both in and out, with blue PP Meltblown Non Woven side facing in towards you.
Our filters are custom-fitted to the G-Series Masks and should be replaced either weekly or after 32 hours of direct use.
Lab Tested
Reusable for 32 Hours
Buy in Bulk
Nelson Labs USA test
98% NaCl
NIOSH NaCl filter efficacy challenge
Nelson LABS USA TEST
98.5% VFE
Viral efficacy score - Carbon filter
Test Criteria
0.3 microns
Median mass diameter
Eco-friendly design
Reuse & Replace
Single-use plastics are a global problem. CastleGrade™ products embody a mindset of sustainability. Our G-Series Masks are reusable, thereby decreasing waste and minimizing the impact on our environment.
Biodegradable Packaging
The Stone Bag
Our G-Series Masks and Filters come safely sealed and packaged in the CastleGrade™ “Stone Bag”, which will completely biodegrade in 14 months and does not need to be recycled.
G-Series Masks
- 95% Efficacy
- Reusable Silicone Mask
- 4 Layers of Filtration
- Comfortable Fit
- Easy to Clean
- Wear w/ Glasses, No Fog
- Sizing Options
N95
Mask
- 95% Efficacy
- Not Reusable
- No Replaceable Filter
- Leaves Marks
- Cannot Clean
- Uncomfortable with Glasses
- Hard to Fit
Surgical
Mask
- Resistant to Matter
- Not Reusable
- No Replaceable Filter
- Loose Fitting
- Cannot Clean
- Fogs Up Glasses
- One Size
Cloth
Mask
- Resistant to Matter
- Reusable
- Cheap or No Filters
- Loose Fitting
- Hard to Clean
- Fogs Up Glasses
- One Size
| Mask Feature | G-Series Mask |
N95 Mask |
Surgical Mask |
Cloth Mask |
|---|---|---|---|---|
| Filtration Level | 98% | 95% | 60% | 50% |
| Reusable | Yes | No | No | Yes |
| Replaceable Filter | Yes | No | No | Varies |
| Easy to clean | Yes | No | No | No |
| Fitting | Comfy | Hard | Loose | Loose |
| Anti-Fog | Yes | No | No | No |
| Sizing Options | Yes | No | No | No |
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 has recently been tested by the FDA, Nelson Labs, Alpha Labs and SMQ Labs and has performed extraordinarily well.
For the majority of adults, we recommend purchasing our Standard (G9) size.
Our Small (G8) size is recommended for teenagers and women with smaller facial features (around 70% of women prefer the G9).
The G7 mask is perfect for kids from 7-11 so now the whole family can get Castle Grade protection!
The G-Series filter has been lab 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 NaCL aerosol challenge test which returned a >98% efficiency score for a median particle mass of <0.3 microns. (The standard for N95 Masks is 95%)
G-Series vs Fabric Masks: Most fabric or cloth masks provide very little protection against viruses which can remain active on fabric for days. These types of masks hold moisture, which reduces efficacy over time and can in some circumstances can actually create greater risk of exposure to the wearer.
In response to the increasing use of fabric masks due to COVID-19, Duke University researchers conducted a study which demonstrated significant shortcomings and can be found here.
You can wear the mask for up to 1 week or 32 hours of direct use, before replacing the filter.
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.
Wearing a high protective, silicone mask will slightly alter / muffle the sound of your voice.
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 respirator mask unfit for use by another customer. Thank you for understanding.
The G-Series Mask is registered as a Class I Medical Device with the TGA in the Australian Therapeutic Goods Registry (ARTG) registration number 341649
Castle Grade launched in Australia in September 2020 and all orders ship locally, from our Melbourne warehouse.