TL;DR: Acrylic and steel are the two materials Canadian clinic owners encounter when shopping for a hard-shell hyperbaric chamber. Steel chambers are stronger, support higher pressures, allow IV poles and ventilator pass-throughs, and have no defined lifecycle. Acrylic chambers are lighter, less expensive, give patients full visibility, and reduce confinement anxiety, but cylinders carry a finite service life. The right choice depends on your treatment indications, patient mix, capital budget, and the regulatory class of chamber Health Canada will license for your facility.
An acrylic vs steel hyperbaric chamber decision is one of the largest capital choices a Canadian clinic owner will make. A medical-grade hyperbaric chamber is a sealed pressure vessel designed to deliver 100 percent oxygen at pressures above one atmosphere, and the construction material directly affects safety, throughput, patient experience, and total cost of ownership over a 15 to 25 year operating life.
This guide breaks down the operational, regulatory, and financial differences between the two materials so Canadian clinic operators can make an evidence-informed purchasing decision. Whether you are opening a new facility or replacing aging equipment, the right answer depends on what indications you treat, what your patient mix looks like, and how Health Canada and the Canadian Standards Association (CSA) will classify your installation.
What is the core difference between acrylic and steel hyperbaric chambers?
An acrylic hyperbaric chamber is a single-occupancy (monoplace) pressure vessel built around a transparent cast acrylic cylinder, sealed at each end by metal heads and a hinged door. A steel hyperbaric chamber is a metal pressure vessel, usually fabricated from medical-grade stainless steel or carbon steel, and is available in both monoplace and multiplace configurations.
The two materials sit in different regulatory and clinical categories. Acrylic monoplace chambers dominate the outpatient wound-care and elective HBOT market because they are lighter, cheaper to install, and let patients see out. Steel multiplace chambers dominate hospital-based programs because they support higher operating pressures, accept critical care equipment, and allow staff to attend patients inside the chamber.
How do acrylic and steel chambers compare across the key operational dimensions?
The table below summarises the practical differences Canadian clinic owners weigh during a purchase decision. Values reflect typical specifications for current commercial models and are not specific to any one manufacturer.
| Dimension | Acrylic Chamber | Steel Chamber |
|---|---|---|
| Typical configuration | Monoplace (single occupancy) | Monoplace or multiplace (1 to 12+ occupants) |
| Maximum operating pressure | Typically 2.0 to 3.0 ATA | Up to 6.0 ATA (depending on chamber class) |
| Patient visibility | 360 degree transparent | Limited to portholes |
| Confinement anxiety risk | Lower | Higher in monoplace, lower in multiplace |
| Cylinder lifecycle | Finite, typically 10 to 20 years before mandated overhaul or replacement | No predefined lifecycle, lifetime of facility with maintenance |
| Capital cost (Canadian, 2026) | ~$150,000 to $300,000 per unit | ~$200,000 (small monoplace) to $2,000,000+ (multiplace) |
| Installation footprint | Single room, standard mechanical | Often requires reinforced floor and dedicated mechanical room |
| Critical-care compatibility | Limited (no ventilator pass-through, no in-chamber attendant) | Full critical-care capability in multiplace configuration |
| Fire risk profile | Combustible cylinder, oxygen-rich interior | Non-combustible structure, oxygen risk localised to hood or mask |
| Typical clinical setting | Outpatient wound-care clinics, private HBOT centres | Hospitals, regional referral centres, dive medicine |
How do pressure ratings differ in practice for Canadian clinics?
Pressure capability is the first technical filter every clinic owner should apply. Acrylic monoplace chambers operate safely in the 2.0 to 3.0 ATA range that covers the majority of Undersea and Hyperbaric Medical Society (UHMS)-recognised indications, including diabetic foot ulcers, delayed radiation injury, and chronic refractory osteomyelitis.
Steel chambers, particularly multiplace units, support the higher pressures required for emergent indications. Decompression sickness and arterial gas embolism are commonly treated using US Navy Treatment Tables that descend to 2.8 ATA or 6.0 ATA, depths that fall outside the routine operating envelope of most acrylic monoplace designs. Carbon monoxide poisoning protocols at 2.8 to 3.0 ATA can be delivered in either material, but high-acuity carbon monoxide cases benefit from the staff access a multiplace steel chamber provides.
If your business plan focuses on elective wound-care, post-radiation tissue, and other outpatient indications, a 3.0 ATA acrylic monoplace will cover your protocol library. If you intend to accept hospital transfers for emergent diving, gas embolism, or ventilated patients, a steel multiplace chamber is the only configuration that meets the clinical brief.
What are the fire safety considerations for each chamber material?
Fire is the single most consequential safety hazard in any hyperbaric facility. A 73-year analysis of hyperbaric and hypobaric chamber fires identified 35 chamber fires worldwide between 1923 and 1996, resulting in 77 human fatalities, and crucially noted that no fire fatalities had occurred in clinical hyperbaric chambers in North America during that period. The dominant ignition sources shifted from electrical faults before 1980 to prohibited items carried into the chamber by occupants after 1980, according to the analysis published by Sheffield and Desautels in Undersea & Hyperbaric Medicine [internal summary].
Acrylic and steel chambers carry different fire-engineering profiles. Acrylic itself is combustible, and once ignited inside an oxygen-rich pressurised environment it sustains rapid propagation. Steel does not burn, which removes the structural fuel load entirely. However, steel multiplace chambers introduce a different consideration: when patients breathe oxygen via hood or mask, oxygen pools locally, so adequate ventilation and oxygen-monitoring become essential controls.
Foundational fire-safety analyses of hyperbaric oxygen facilities continue to inform modern accreditation requirements [internal summary]. The standards identify three required fire conditions (fuel, oxygen, and an ignition source) and dictate that an effective control program eliminates at least one. Whichever material you select, your written fire-safety program must address grounding, prohibited items, electrical equipment certification, fire suppression, and staff drills.
Acrylic cylinders also carry a mechanical-failure exposure that steel does not. Ballistic impact to a monoplace acrylic cylinder can compromise the cylinder while preserving sufficient material to prevent catastrophic rupture, but this is a low-probability event [internal summary]. The more common acrylic concern is surface scratching and crazing over years of clinical use, which is why manufacturers mandate periodic inspection and overhaul.
How does Health Canada classify hyperbaric chambers?
Hyperbaric chambers sold and operated in Canada must comply with two parallel regulatory streams. The first is the Medical Devices Regulations administered by Health Canada, and the second is the pressure-vessel regime administered provincially under the CSA framework.
Under the Medical Devices Regulations, hyperbaric chambers used for therapeutic purposes are typically classified as Class III medical devices, requiring a Medical Device Licence (MDL) issued by Health Canada before they can be imported, sold, or distributed. The MDL holder must demonstrate compliance with safety and effectiveness requirements, supply quality system certification, and provide labelling that meets Canadian requirements.
The pressure-vessel stream is governed by the CSA B51 Boiler, Pressure Vessel, and Pressure Piping Code, the CSA Z275.1 standard for hyperbaric facilities, and the ASME PVHO-1 Safety Standard for Pressure Vessels for Human Occupancy. Every chamber installed in Canada must carry a Canadian Registration Number (CRN) issued by the provincial pressure-vessel authority where it is installed. The chamber and its operator must satisfy both regulatory streams before patients can be treated.
The CSA Z275.1 standard distinguishes Class A multi-occupancy chambers (which can be pressurised on air with patients breathing oxygen by mask or hood) from Class B single-occupancy chambers (typically pressurised with oxygen). Acrylic monoplace chambers are Class B; steel multiplace chambers are Class A. The class determines the design and operational requirements your facility must meet.
Whichever material you select, confirm with the manufacturer that the model holds an active Health Canada Medical Device Licence and that it can be registered with your provincial pressure-vessel authority. Ask for the MDL number and the CRN before signing a purchase order. The Health Canada Medical Devices Active Licence Listing is publicly searchable.
What is the lifecycle cost of each chamber type?
Capital cost is only the first lifecycle expense. Total cost of ownership for a Canadian hyperbaric chamber over 20 years includes installation, annual service contracts, periodic overhaul, gas supply, staffing, and eventual decommissioning.
For an acrylic monoplace chamber, expect:
- Capital cost: Approximately $150,000 to $300,000 CAD per unit, depending on automation level and accessories
- Installation: $30,000 to $80,000 for a typical outpatient room (electrical, gas piping, ventilation, fire suppression)
- Annual service contract: $8,000 to $15,000 covering preventive maintenance and safety inspections
- Cylinder overhaul: Mandatory inspection and refurbishment cycle dictated by the manufacturer, often every 10 to 15 years, costing $40,000 to $80,000
- Useful operating life: 15 to 25 years with overhaul; the cylinder is the limiting component
For a steel monoplace chamber, expect:
- Capital cost: Approximately $200,000 to $400,000 CAD per unit
- Installation: $40,000 to $100,000, often higher than acrylic due to weight
- Annual service contract: $10,000 to $20,000
- No mandated cylinder overhaul: Pressure-boundary inspections continue indefinitely; the steel shell does not require periodic replacement
- Useful operating life: 25 to 40+ years with maintenance
Steel multiplace chambers run an order of magnitude higher: $1,000,000 to $5,000,000 CAD installed, with annual service contracts of $40,000 to $100,000 and significantly higher staffing costs because each session requires a chamber operator and an inside attendant. These are hospital and regional-centre investments rather than private-clinic decisions.
For most Canadian wound-care and elective HBOT clinics, an acrylic monoplace chamber delivers the lowest cost per patient session. Steel becomes economic at scale or when the indication mix demands ventilator-dependent or critical-care capability.
Which patient populations and protocols suit each chamber type?
Patient experience and safety profiles are not identical between materials. The hyperoxic environment of a monoplace chamber, where the patient is pressurised on 100 percent oxygen, is associated with higher reported rates of middle-ear barotrauma than in a multiplace chamber where patients breathe oxygen by hood and the chamber itself is pressurised on air. Recent studies report middle-ear barotrauma in 56 percent or more of patients undergoing monoplace HBOT, with rates climbing past 65 percent in carbon monoxide poisoning cohorts. Multiplace chambers report lower rates because pressurisation rates can be slowed at the patient’s request.
Confinement anxiety is the second material-sensitive consideration. Acrylic monoplace chambers offer 360 degree visibility, which substantially reduces claustrophobic distress; many patients who could not tolerate a steel monoplace will tolerate an acrylic. Steel multiplace chambers also fare well because the patient is in a room-sized environment with staff present.
Seizures are rare but documented. A retrospective cohort study of 634 monoplace HBOT sessions in non-emergent patients with a history of seizures recorded one seizure event during treatment, indicating that with appropriate screening and air-break protocols the risk remains low [internal summary]. Either chamber type can deliver air-break protocols safely; multiplace chambers add the option of immediate in-chamber clinical response.
For ventilated, sedated, or otherwise critical-care patients, only a steel multiplace chamber is clinically appropriate. Monoplace chambers (acrylic or steel) cannot accept staff attendance or pass-through tubing for ventilator circuits, infusion lines, and continuous monitoring at the level required for ICU-grade care.
How should Canadian clinic owners decide between acrylic and steel?
The decision matrix below maps the most common Canadian clinic profiles to the chamber material that fits each one. This is a starting framework, not a substitute for engineering and regulatory consultation.
- Outpatient wound-care clinic, elective indications, 3 to 8 patients per day: Acrylic monoplace, 3.0 ATA. Lowest capital cost, highest patient comfort.
- Multi-chamber private HBOT centre, mixed conditions, 15+ patients per day: Bank of acrylic monoplace chambers running parallel sessions. Throughput beats single multiplace economics.
- Hospital-based program with critical-care intake, dive medicine, gas embolism: Steel multiplace chamber. Only configuration that meets the clinical brief.
- Regional referral centre, mixed elective and emergent caseload: Steel multiplace chamber, often paired with one or two acrylic monoplace chambers for high-volume elective treatment.
- Veterinary HBOT facility: Acrylic monoplace, but verify cylinder warranty terms because animal claw and tooth contact accelerates surface damage.
Whichever direction your business plan points, contact the Canadian Undersea and Hyperbaric Medical Association (CUHMA) and the Undersea and Hyperbaric Medical Society (UHMS) early in the planning process. Both organisations publish accreditation manuals that codify the operational requirements your facility will need to meet, regardless of chamber material.
Frequently asked questions about acrylic and steel hyperbaric chambers
Are acrylic hyperbaric chambers safe for medical use in Canada?
Yes, when the chamber holds an active Health Canada Medical Device Licence and is installed under a Canadian Registration Number issued by the provincial pressure-vessel authority. Acrylic monoplace chambers have been the dominant outpatient HBOT platform in North America for over three decades and are routinely accredited under UHMS standards. The clinical safety record has been documented across thousands of patient-sessions [PubMed].
Why do hospitals use steel multiplace chambers instead of acrylic?
Hospitals require ventilator and infusion-pump compatibility, in-chamber clinical attendance, higher operating pressures (up to 6.0 ATA for serious decompression sickness), and the ability to treat unstable or sedated patients. Acrylic monoplace chambers cannot meet these requirements. A steel multiplace chamber functions as a small, pressurised treatment room rather than a single-patient capsule.
Do acrylic chambers really need to be replaced or overhauled?
The acrylic cylinder itself has a finite service life. Manufacturers typically specify mandatory inspection, overhaul, or replacement at intervals between 10 and 20 years, depending on the design and the operating envelope. The metal heads, doors, valves, and control systems can usually be serviced and retained. Plan a sinking fund for cylinder overhaul as part of your business case.
What pressure rating do most Canadian HBOT clinics actually need?
Most UHMS-recognised indications are delivered at 2.0 to 2.4 ATA, and almost all are within 2.8 ATA. A chamber rated for 3.0 ATA covers virtually every elective HBOT protocol. Higher pressures (up to 6.0 ATA) are required only for severe decompression sickness and arterial gas embolism, which are uncommon outside of dive medicine and tertiary-care centres.
How long does it take to license a new hyperbaric chamber in Canada?
If the chamber model already holds a Health Canada Medical Device Licence, your facility-level work focuses on the provincial CRN registration, the building permit and mechanical work, the fire-safety plan, and staff training. The realistic timeline from purchase to first patient is typically 9 to 18 months. CSA Z275.1 compliance and UHMS accreditation are separate workstreams that can run in parallel.
Can I buy a used acrylic or steel chamber and re-licence it?
Used medical-grade chambers are commercially traded, but a Canadian buyer must verify three things before completing a transaction: the model still holds an active Health Canada Medical Device Licence (or the original manufacturer will assist with re-licensing); the pressure boundary has documented inspection history acceptable to the provincial pressure-vessel authority; and any acrylic cylinder is within its overhaul cycle or the cost of overhaul is factored into the purchase. Used steel chambers can be a sensible value purchase. Used acrylic chambers require closer due diligence on cylinder condition.
Are mild or “soft” hyperbaric chambers an alternative to acrylic or steel?
No. Mild hyperbaric chambers (often called soft-shell, fabric, or portable chambers) operate at 1.3 ATA, are not licensed by Health Canada as therapeutic medical devices, and are not accepted by UHMS for the recognised indications. They are sold for wellness use and should not be considered equivalent to a hard-shell acrylic or steel chamber for clinical HBOT delivery. Treat soft-shell chambers as a separate product category.
Where can I find an accredited hyperbaric facility in Canada?
Canada Hyperbarics maintains a continuously verified directory of hospitals and regulated facilities across the country, including chamber type, indications treated, and referral pathway by province.
Next steps for Canadian clinic owners
The acrylic vs steel decision is solvable once you know your indication mix, your patient acuity, and your capital plan. Start by writing down the clinical brief: which UHMS indications you intend to offer, what the maximum operating pressure must be, and whether you will accept ventilated or critical-care patients. Then map that brief against the comparison table above. The chamber type chooses itself for most operators.
If you are still weighing options, browse Canada Hyperbarics’ database of hospitals and regulated facilities to see how operating clinics across the country have configured their installations. Our research database contains 14,000+ peer-reviewed studies on HBOT safety, efficacy, and chamber operations, and our regulatory page tracks Health Canada and CSA updates relevant to chamber operators.
This content is for informational purposes only and does not constitute medical advice, regulatory advice, or engineering advice. Hyperbaric chamber selection, installation, and operation in Canada must comply with Health Canada Medical Devices Regulations, the Canadian Standards Association pressure-vessel codes, and the requirements of your provincial pressure-vessel authority. Consult qualified regulatory and engineering professionals before making a purchasing decision.