| Basic definition | A sealed or controlled-enclosure system used to handle hazardous, sterile, or contamination-sensitive materials. | Operators work through glove ports or integrated transfer systems instead of directly opening the enclosure. | Selected when containment, product protection, personnel protection, or a combination of these is required. |
| Containment objective | Personnel and environmental protection, product protection, or both. | The enclosure, pressure regime, filtration, transfer ports, and operating procedures work together to control exposure and contamination. | Risk assessment should define whether the process prioritizes operator safety, sterility, cross-contamination control, or all three. |
| Pressure mode | Negative-pressure, positive-pressure, or pressure-cascade configuration. | Negative pressure helps prevent hazardous material from escaping; positive pressure helps prevent surrounding air from entering the process zone. | Negative pressure is generally associated with containment; positive pressure is commonly used where product sterility is the main concern. |
| Airflow pattern | Recirculating airflow, single-pass airflow, or a hybrid arrangement. | Fans and ductwork direct air through filtration stages while maintaining the specified pressure and cleanliness conditions. | Single-pass designs can be preferred for certain hazardous applications; recirculation may reduce energy use but requires appropriate risk controls. |
| Final filtration | High-efficiency particulate air filtration on supply, exhaust, or both air paths. | HEPA filters capture airborne particles, including microorganisms attached to particles; filter performance must be tested in the installed system. | Filter grade, quantity, location, leak testing, and safe-change provisions should match the hazard assessment and local requirements. |
| Operator interface | Glove ports, sleeve-and-glove assemblies, or half-suit systems. | The barrier separates the operator from the process while allowing manipulation of materials and equipment. | Glove material, ergonomic reach, glove replacement method, and integrity testing affect both safety and usability. |
| Material transfer | Interlocked pass-through chamber, rapid-transfer port, sealed container transfer, or decontamination chamber. | Materials enter or leave through a controlled interface that limits pressure disruption and reduces contamination transfer. | The transfer method should be validated for the load size, material compatibility, cycle time, and required decontamination level. |
| Decontamination method | Manual cleaning, vaporized hydrogen peroxide, hydrogen peroxide aerosol, chlorine dioxide, or another validated method. | A validated chemical or physical cycle reduces viable contamination on internal surfaces and transferred items. | Cycle development must consider biological indicators, material compatibility, aeration, residual limits, and operator safety. |
| Typical cleanliness target | Often designed to support ISO 14644 cleanroom classifications, commonly ISO Class 5 in critical work zones when specified. | Filtered air and controlled operating procedures limit airborne particulate levels in the critical zone. | The required classification depends on the process, product, regulatory framework, and measured performance—not on the enclosure name alone. |
| Common applications | Sterile pharmaceutical processing, high-potency compounds, microbiology, cell and gene therapy, toxicology, and powder handling. | The enclosure isolates the process from the surrounding room and provides controlled access for manipulation and transfer. | The configuration should be customized to the biological, chemical, particulate, and sterility risks of the application. |
| Monitoring parameters | Pressure differential, airflow, filter pressure drop, temperature, humidity, particle concentration, and alarm status. | Sensors and alarms identify deviations that could compromise containment, cleanliness, or process control. | Critical parameters should have defined limits, calibration intervals, alarm responses, and documented data retention. |
| Validation activities | Factory acceptance testing, site acceptance testing, airflow visualization, HEPA integrity testing, pressure testing, and decontamination-cycle validation. | Testing demonstrates that the installed isolator performs as intended under defined operating conditions. | Acceptance criteria should be agreed before purchase and linked to the intended use, quality system, and applicable regulations. |
| Relevant standards and guidance | ISO 14644 series, EN 12469 where applicable to microbiological safety cabinets, GMP requirements, and site-specific biosafety procedures. | Standards address areas such as airborne cleanliness, performance testing, containment, qualification, and operational control. | No single standard covers every isolator design; the applicable framework depends on the product, hazard, geography, and facility use. |