ST53 Self-Contained Breathing Apparatus
Versatile Protection For Tactical Operations
The ST53 combines Avon Protection's FM53 mask technology with an advanced modular breathing apparatus to provide positive pressure SCBA and/or PAPR capability for specialist operations.
Developed with the unknown elements of a threat scenario in mind, the ST53™ is the most advanced CBRN respiratory solution on the market. It enables a fast response to changing operational conditions in one complete modular system.
A switch between negative (filter) and positive (SCBA) pressure is achieved at the flick of a lever on the front of the mask. And by attaching a short or long duration compressed air cylinder, it is possible to enter a location on filter mode, assess the situation and change to SCBA mode if the need arises.
Compact Demand Valve (CDV)
- 1st breath activated for “instant on”
- Rugged, compact design delivers high flow rates
- Screw-on-design allows for DIN 40 thread
Gauge & Whistle
- Located on shoulder straps for easy access
- Positioned for high noise environments and easy gauge reading
- Illuminated gauge for low-light situations
Comfort
- Ergonomically contoured backframe for comfort
- Adjustable harness allows for quick donning / doffing
- Padded shoulder straps for comfort
Stealth Appearance
- Black low profile design
- Lightweight compared to traditional SCBA units
- Silent operation for critical missions
SPECIFICATIONS
| Breathing performance in SCBA mode | |
|---|---|
| Breathing Rate | 103 liters per minute with mask pressure above ambient |
| Environmental range | The operating range is -30oC + 60oC |
| End of cylinder air | Able to sustain positive pressure down to 10 bar cylinder pressure |
| Breathing Performance in ST PAPR mode | |
| Breathing rate | 125 - 165 liters per minute |
| Breathing performance in APR mode | |
| Breathing resistance | Exhalation breathing resistance of no greater than 20mm of water at 85 lpm in a negative pressure mode |
| Inhalation resistance including General Purpose filter | 50 mm of water at 85 lpm |
| Materials used | |
| Harness on ST53 SCBA | Kevlar webbing with stainless steel nylon hardware |
| Harness on ST53SD SCBA | Nylon Cordura |
| Backplate | Glass reinforced polycarbonate |
| Cylinder valve | Anodized Aluminum |
| ST-PAPR | GE Noryl with a 10% glass fill |
| Unit/System | Weight (Based on empty cylinders) |
| ST53 (excluding cylinder and mask) | 6.6 lbs |
| Carbon fiber fully wrapped, 2216 psi, 30 minute | 7.75 lbs |
| Carbon fiber fully wrapped, 4500 psi, 30 minute | 7.4 lbs |
| Carbon fiber fully wrapped, 4500 psi, 45 minute | 9.9 lbs |
| Carbon fiber fully wrapped, 4500 psi, 60 minute | 11.95 lbs |
| ST-PAPR without CDV, battery or cartridges | 2.5 lbs |
| ST-PAPR without CDV, two general purpose filters and a lithium Sulphur Dioxide battery | 4.4 lbs |
| ST53SD 11 cu. ft (includes cylinder but no mask) | 5.2 lbs |
| ST53SD 17 cu. ft (includes cylinder but no mask) | 4.0 lbs |
| Single Port FM53 mask (excluding filter) | 1.2 lbs |
| Dual Port FM53 mask (excluding filter) | 1.3 lbs |
| Requirements | Actual | |||
|---|---|---|---|---|
| Challenge chemical | Max Peak (mg/m3) | Max Cumulative (mg-min/m3) | Max Peak (mg-m3) | Max Cumulative (mg-min/m3 ) |
| Sarin (GB) | 0.6 | 6 | 0.004 | 0.203 |
| Mustard (HD) | 0.087 | 6 | 0.005 | 0.8 |
| Test agent | NIOSH CBRN requirements | Typical performance | ||
| Mustard (HD) | 6 Hours | > 6 Hours | ||
| Sarin (GB) | 6 Hours | > 6 Hours | ||
| (Data validated by ECBC, Edgewood Chemical Biological Center) | ||||