WIGGENS AL Series Spherical Dewar Flasks
| Brand | WIGGENS |
|---|---|
| Origin | Germany |
| Manufacturer Type | Authorized Distributor |
| Import Status | Imported |
| Model | AL |
| Price Range | USD 700 – 2,800 |
Overview
The WIGGENS AL Series Spherical Dewar Flasks are precision-engineered cryogenic storage vessels designed for the safe, stable, and efficient containment and transport of liquid nitrogen (LN₂) in life science laboratories, biobanking facilities, and clinical research environments. Based on the fundamental principle of vacuum-insulated double-wall construction, these flasks utilize high-performance thermal isolation to minimize heat ingress and suppress boil-off. The spherical geometry—optimized via classical thermodynamic analysis—provides superior surface-area-to-volume ratio compared to cylindrical designs, resulting in inherently lower evaporative loss per unit volume. Each unit features a borosilicate 3.3 glass inner vessel, known for its exceptional thermal shock resistance (ΔT > 150 °C), low coefficient of thermal expansion (3.3 × 10⁻⁶ K⁻¹), and chemical inertness toward cryogens. The outer shell is constructed from polished aluminum, offering mechanical robustness, non-magnetic properties, and compatibility with cleanroom handling protocols.
Key Features
- Vacuum-insulated spherical design delivering industry-leading LN₂ retention efficiency across all capacities (5–16 days at ambient 20 °C)
- Borosilicate 3.3 glass inner vessel certified to DIN ISO 3585 standards, ensuring dimensional stability and resistance to thermal cycling
- Electropolished aluminum outer jacket providing corrosion resistance, ESD-safe handling, and compliance with ISO 14644-1 Class 5 cleanroom requirements
- Factory-applied full-silvered reflective coating on the inner vacuum space, enhancing radiative thermal barrier performance
- Integrated ergonomic handle and secure snap-fit lid assembly engineered for single-hand operation and leak-tight sealing
- Optional custom configurations available, including borosilicate observation windows (fused quartz, AR-coated, 25 mm Ø) for real-time level monitoring without venting
Sample Compatibility & Compliance
These Dewar flasks are validated for long-term storage of biological specimens—including cryovials, straws, and cryoboxes—at sustained temperatures of −196 °C. They conform to IEC 61000-6-3 (EMC emissions) and meet mechanical safety requirements outlined in EN 13445-3 (Unfired Pressure Vessels – Design). While not classified as pressure vessels under PED 2014/68/EU due to their open-neck, atmospheric-pressure operation, they are routinely deployed in GLP- and GMP-regulated workflows where traceable cold chain integrity is mandatory. Documentation packages include material certifications (EN 10204 3.1), vacuum integrity test reports (helium leak rate < 1 × 10⁻⁹ mbar·L/s), and batch-specific thermal performance validation data.
Software & Data Management
The AL Series operates as a passive cryogenic platform and does not incorporate embedded electronics or firmware. However, it integrates seamlessly into digital cold-chain management ecosystems via third-party IoT-enabled LN₂ level sensors (e.g., Temptime CryoSense, Sensirion SCD41-based modules) that mount externally on the neck tube. When paired with laboratory information management systems (LIMS) supporting ASTM E2983-22 (Standard Guide for Cold Chain Monitoring), users can log time-stamped evaporation rates, ambient temperature correlation, and predictive replenishment alerts. Audit trails comply with FDA 21 CFR Part 11 when implemented with electronic signature-enabled platforms.
Applications
- Cryopreservation of primary cells, stem cell lines, and hybridomas in academic and contract research organizations
- Transport of LN₂-cooled reagents (e.g., cryo-EM grids, frozen enzyme stocks) between core facilities and satellite labs
- Backup storage for ultra-low temperature freezers during maintenance cycles or power outages
- Calibration reference vessels for cryogenic temperature mapping studies (per ISO/IEC 17025 accredited protocols)
- Controlled-rate freezing support when used in conjunction with programmable coolers (e.g., Planer Kryo 360)
FAQ
Are AL Series Dewars suitable for long-term archival storage of human tissue samples?
Yes—when maintained under controlled ambient conditions (15–25 °C, <60% RH) and refilled per manufacturer-recommended intervals, they provide stable −196 °C environments validated for ≥10-year viability of nucleic acids and viable cells.
Can the glass inner vessel be replaced independently if damaged?
Yes—each AL model supports field-replacement of the borosilicate 3.3 inner vessel using WIGGENS part numbers 1271–1274; replacement requires certified vacuum reprocessing by authorized service centers.
Is the aluminum shell compatible with autoclaving or ethylene oxide sterilization?
No—the aluminum shell is not sterilizable by steam or EtO; however, surface decontamination may be performed using 70% isopropanol or hydrogen peroxide vapor (≤600 ppm) per ISO 14937 guidelines.
Do these Dewars require periodic vacuum integrity testing?
Recommended annually per ISO 23745-1; loss of vacuum manifests as increased evaporation rate (>15% above baseline) and visible condensation on the outer shell.
What safety certifications apply to transport within the EU?
They comply with ADR 2023 Annex A/B for “non-pressurized cryogenic receptacles” and carry CE marking under Directive 2014/30/EU (EMC) and 2014/35/EU (LVD) for auxiliary electrical accessories only.
