ST53

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.

Suitable for:

  • First Responders
  • Military
  • Special Forces

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.

Features and Benefits

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 

Technical Specifications

 

Technical Data
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/SystemWeight (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

 

Live Agent Permeation Performance
 RequirementsActual
Challenge chemical Max Peak (mg/m3) Max Cumulative (mg-min/m3) Max Peak (mg-m3) Max Cumulative (mg-min/m)
Sarin (GB) 0.6 6 0.004 0.203
Mustard (HD) 0.087 6 0.005 0.8
Test agentNIOSH CBRN requirementsTypical performance
Mustard (HD) 6 Hours > 6 Hours
Sarin (GB) 6 Hours > 6 Hours
(Data validated by ECBC, Edgewood Chemical Biological Center)

Type-examination approval: PPE Regulation 2016/425/EU - Module B: Certificate CE 684849

The Avon Protection ST53 SCBA carries a NIOSH Industrial Approval under the provisions of 42 CFR 84 TC-13F in a variety of cylinder and facepiece size combinations.

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