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G-Series Masks

The Next Generation of Protection

Our masks are built on the principles of safety, comfort and reusability.

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Designed for Comfort

Soft, Comfortable, Fog-Free

Our G-Series soft silicone fit seals for superior protection, no fogging of glasses and the comfort to wear all day

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reusable = sustainable


Help us prevent mask waste with our reusable design, biodegradable packaging and 100% carbon neutral shipping within Australia.

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Innovation for real protection


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, saving you money while helping prevent 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

  • 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. 


    Nurse and blogger
  • I work in a retail environment. Sometimes my days can be 10 hours long. The Castle Grade mask is the most comfortable mask that I have tried. I am very freaked out about working in an environment that has a constant flow of people in and out of the store. This mask is giving me some peace of mind. I fully expect to be wearing a mask for at the least the next year. This is the mask to get.

    William Fox

    Castle Grade Customer
  • So happy to have found a reusable mask that offers a little more protection than a simple cloth mask. I am a teacher, and we’re headed into our building with over 500 souls. There’s no way I won’t be exposed repeatedly to COVID-19. School staff are starting from zero with ppe. Appreciate the lack of waste with this model and the comfort.

    Julie Hinkle

    Teacher and Castle Grade Customer
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

Efficacy filtering 0.26 micron particles


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.

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Frequently Asked Questions

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.