ST1 Balance Enclosure – Advanced Containment for Precision Weighing

The ST1 Balance Enclosure from Envirosafe Ireland is engineered to provide highly effective operator protection during laboratory weighing procedures involving potent or hazardous powders. Its airflow-controlled, low-turbulence design enables safe handling of active pharmaceutical ingredients (APIs), fine chemicals, or biological materials, without compromising weighing accuracy or operator comfort.

Developed for laboratory environments that demand precision and containment, the ST1 is built around best-in-class airflow technology, advanced filtration, and vibration suppression systems. Its compact benchtop footprint makes it ideal for both space-constrained laboratories and larger cleanroom installations.

Containment You Can Trust: Verified <15 ng/m³ Exposure

The ST1 has been independently validated to contain airborne particles below 15 nanograms per cubic metre (ng/m³), making it fully suitable for handling hazardous powders under EU and global containment standards. This performance exceeds typical Class I containment systems and meets the stringent safety demands of pharmaceutical R&D and quality control labs.

Testing has been conducted to internationally recognised protocols including EN 14175, ASHRAE 110, and SafeBridge criteria. The result is a fully compliant, high-performance enclosure that ensures operator safety and minimises environmental contamination.

Advanced Airflow and HEPA Filtration System

The unit features a patented low-turbulence airflow system that maintains a stable containment zone inside the enclosure. Air is drawn smoothly across the workspace to avoid disturbing sensitive balances, then passed through a dual-stage filtration system:

• Pre-filter for large particles and dust
• HEPA H14 filter (99.995% efficiency at 0.3 μm) for submicron particulate capture

For enhanced safety, the filters are housed in a safe-change system, allowing clean, tool-free replacement without exposure risk.

Built-In Safety Features & Operator Assurance

The ST1 is fitted with real-time airflow monitoring and dual-sensor alarms to ensure that airflow conditions remain within safe parameters. If airflow deviates from safe operating levels, visual and audible alarms alert the user immediately.

Additional features include:

• Full polycarbonate side and front panels for excellent visibility
• Integrated lighting (optional LED upgrades)
• Ergonomic sash opening for easy equipment access
• Anti-bypass baffles and side extract zones for consistent airflow control

Precision Weighing Without Vibration Interference

To ensure weighing integrity, the ST1 includes either a granite or ceramic vibration-dampening base, isolating sensitive balances from both mechanical and airflow-generated vibrations. This enables reliable microbalance measurements even down to microgram levels.

Pairing this stability with ultra-quiet fan operation makes the ST1 ideal for analytical workflows that require minimal disruption.

Applications Across Industries

The ST1 Balance Enclosure is ideal for:

• Pharmaceutical laboratories – safe handling of APIs, excipients, and drug substances
• Research institutions – accurate weighing in chemical or biological studies
• Healthcare & hospitals – cytotoxic drug preparation or powdered drug handling
• Cleanrooms and GMP suites – safe integration with laminar flow systems or isolators

Technical Specifications (Overview)

Downloads & Support

• Download our Containment Solutions Overview Brochure
• Download ST1 Technical Sheet
• Installation, commissioning, and ongoing maintenance available across Ireland
• Contact us to request a quote or on-site consultation