This chapter defines the specifications, certifications, and operating procedures for the three categories of cryogenic transport containers: the dewar, the LN2-filled container, and the dry shipper. It explains the vacuum insulation structure of the dewar, the absorbent matrix of the dry shipper, and the certification schemes under IATA, NFPA, and ISO 21029, and how they interface with the Korean Register (KR), the Korea Institute of Aviation Safety Technology (KIAST), and the Ministry of Food and Drug Safety (MFDS) Good Manufacturing Practice (GMP).
The WIA-CRYO-009 standard classifies cryogenic transport containers into three categories and nine grades. Classification depends on the holding medium (liquid LN2, LN2 vapor, none) and the certification scheme (IATA, IMO, UN ECE). Each category is directly selectable in the data-format panel of the simulator.
| Category | Medium | Typical Holding Time | Primary Use | Core Standard |
|---|---|---|---|---|
| Dewar | Liquid LN2 filled | 7 to 30 days | Short-distance inter-facility transport | ISO 21029, NFPA 55 |
| LN2-filled container | Liquid LN2 plus absorbent | 10 to 21 days | Long-distance air transport | IATA DGR PI 202, ISO 21496 |
| Dry shipper | Absorbent only (no liquid LN2) | 10 to 20 days | International air transport (UN 1977 exempt) | IATA DGR A152, FAA 49 CFR 173.320 |
The dewar is a vacuum-insulated vessel invented by Sir James Dewar in 1892 and serves as the most fundamental container in this standard. The structure forms a vacuum below 10^-6 Torr between the inner and outer walls, blocking all three heat transfer mechanisms — radiation, conduction, and convection. The dewars commonly used in Korea are primarily the 50L, 100L, and 250L models from MVE Inc. of the United States; the 50L and 100L models from Taiyo Nippon Sanso of Japan; and, as a Korean-made dewar, the 50L and 100L models from KOGAS-TECH, a subsidiary of the Korea Gas Corporation (KOGAS), which hold MFDS GMP certification.
The core specification of a dewar is its static holding time (SHT), defined as the time during which the dewar maintains LN2 at -196°C under static conditions. SHT depends on dewar capacity, insulation efficiency, and external temperature. The SHT of a standard 50L dewar is 28 to 32 days, and that of a 100L dewar is 60 to 75 days. In a transport environment, vibration, temperature variation, and repeated lid openings shorten the effective holding time to roughly 60 to 70% of SHT, and this standard requires transport completion within 80% of the SHT.
The LN2-filled container is an intermediate form between the dewar and the dry shipper. Liquid LN2 saturates an absorbent matrix. It is classified as UN 1977 (Nitrogen, refrigerated liquid) and is permitted for air transport under IATA DGR Packing Instruction 202. Common models in Korea include the MVE SC series (SC 4/3V, SC 11/7V, SC 20/12V) and the Taylor-Wharton CryoExpress series.
A key characteristic of this format is that the risk of LN2 leakage requires additional safety measures during aircraft cargo loading. The Incheon International Airport cargo terminal inspects the ventilation system of the Unit Load Device (ULD) when loading LN2-filled containers, and Hanjin Logistics operates a 24-hour LN2 leak detection sensor system at its Incheon Airport hub. IATA DGR PI 202 requires that the LN2 level be kept at or below 95% of nominal capacity immediately before loading, providing safety margin against pressure changes during flight.
The dry shipper is the safest category in this standard. Because liquid LN2 is completely absorbed by the absorbent and there is no risk of leakage, the dry shipper is exempt from the dangerous goods classification under IATA DGR Special Provision A152. Representative models include the Cryoport Express Shipper (SmartPak II, ICE-VIP), the MVE Vapor Shipper, and, as a Korean firm, the K-VS series from Q-RoCryo, a spin-off of the Korea Research Institute of Chemical Technology (KRICT), which holds MFDS GMP certification.
The absorbent in a dry shipper is generally a porous molecular sieve or a solid-phase absorbent, with an absorption capacity of approximately 30 to 40% of the container volume. The holding time under -196°C is 10 to 20 days, satisfying the non-hazardous standard of FAA 49 CFR 173.320. The dry shipper is the standard option for international air transport, used most frequently on major routes such as Incheon to Chicago O'Hare, Incheon to Frankfurt, and Incheon to Tokyo Narita.
The insulation performance of a cryogenic transport container is determined by blocking three heat transfer paths: radiation, conduction, and convection. This section summarizes the theoretical limits of each path and measurements from Korean manufacturers.
Radiation heat transfer follows the Stefan-Boltzmann law q = σε(T1^4 - T2^4). When T1 = 297 K (room temperature) and T2 = 77 K (interior LN2), the radiation heat input is proportional to the surface emissivity ε. Standard dewars apply aluminum or silver coatings to the inner wall, achieving ε of approximately 0.02 to 0.05. High-end dewars with multi-layer insulation (MLI) can achieve ε of approximately 0.005. This is a 2024 research outcome of the KAIST Department of Mechanical Engineering, an active development area in Korea linked to aerospace technology.
Conduction heat transfer occurs through the dewar neck, support structures, and inlet plug. According to data from the Korea Gas Corporation (KOGAS), neck conduction accounts for approximately 65 to 70% of the total heat input in a 250L dewar. This standard requires the use of low-thermal-conductivity materials (stainless steel 304L or G-10 glass epoxy composite) for the neck, and the Korean Register (KR) verifies this specification during container certification.
Under vacuum (below 10^-6 Torr), convection heat transfer is essentially absent. However, vacuum loss activates convection and rapidly reduces holding time. This standard requires verification of dewar vacuum every 6 months, with gauge measurement records maintained by the Korea Testing and Research Institute (KTR) or a KOLAS-accredited testing laboratory.
This standard defines a five-tier certification scheme for dewars, LN2 containers, and dry shippers under IATA, UN, ISO, NFPA, and MFDS.
The IATA DGR 65th Edition classifies cryogenic transport containers for air transport as follows.
In Korea, the Korea Institute of Aviation Safety Technology (KIAST) administers IATA DGR domestically and issues dangerous goods transport permits under Article 70 of the Aviation Safety Act. The dangerous goods inspection counter at the Incheon Airport cargo terminal operates 24 hours, and Hanjin Logistics, CJ Logistics, Lotte Global Logistics, FedEx Korea, DHL Korea, and UPS Korea all load cargo through this counter.
For sea transport, IMO IMDG Code Amendment 41-22 applies. UN 1977 is classified as Class 2.2 Group N (non-flammable, non-toxic), and containers must be certified by the Korean Register (KR) or by another IACS member society such as the American Bureau of Shipping (ABS) or Det Norske Veritas (DNV). The ports of Busan, Incheon, and Gwangyang all accept transshipment of KR-certified containers, and these ports simultaneously verify the related provisions of IMO MARPOL Annex II.
For land transport, UN ECE ADR 2025 Chapter 6.2.6 (open cryogenic receptacles) and Chapter 4.1 (use of packagings) apply. Article 35 of Korea's Trucking Transport Business Act is the domestic basis for ADR, and dangerous goods transport vehicles must be registered with the Ministry of Land, Infrastructure and Transport (MOLIT). Hanjin Logistics, CJ Logistics, and Lotte Global Logistics all operate ADR-certified vehicles, and Korea Post operates ADR vehicles on selected routes.
ISO 21029-1:2018 Cryogenic vessels — Transportable vacuum-insulated vessels of not more than 1,000 litres volume — Part 1: Design, fabrication, inspection and tests specifies the design, fabrication, inspection, and testing of transportable cryogenic vessels of 1,000 L or less. In Korea, this is adopted as KS B ISO 21029-1, with the Korea Testing and Research Institute (KTR) as the certification body.
The MFDS Good Manufacturing Practice regulations impose additional requirements on transport containers for human tissues and biopharmaceuticals. Specifically, Article 13 of the Human Tissue Safety and Management Act enforcement regulation prescribes cleaning, disinfection, and reuse procedures for transport containers, with standard operating procedures provided by KRIBB.
This section defines the four-stage operating procedure of pre-departure check, loading, transshipment, and post-arrival check for dewars, LN2 containers, and dry shippers.
The following eight items are inspected within 24 hours before departure. Each item is identical to a checkpoint in the MFDS Good Tissue Practice (GTP) post-market surveillance.
The standard loading time per container is within 90 seconds. The Cool Cargo Center at the Incheon Airport cargo terminal applies a 60-second standard, and the Hanjin Logistics and CJ Logistics hubs at Gimpo Airport apply the same standard. To minimize dewar lid opening time during loading, a pre-charged supplement dewar is transported alongside.
Transshipment is the most hazardous stage in this standard. LN2 replenishment, container inspection, and document handover occur simultaneously. This standard limits transshipment time to within 5 minutes and recommends suspension of transshipment when the ambient temperature at the transshipment point exceeds 35°C. For domestic transshipment between Incheon and Busan Gimhae, FedEx Korea, DHL Korea, and UPS Korea all operate dedicated transshipment counters.
The following are performed within 1 hour after arrival. Each item is identical to the standard SOP of KRIBB.
The Korean ecosystem for cryogenic transport containers is composed as follows.
In July 2024, a CAR-T clinical trial specimen departing from the National Cancer Center was transported to the Mayo Clinic in the United States. The case used a single Cryoport SmartPak II dry shipper and was exempted from the dangerous goods classification under IATA DGR Special Provision A152. During the 23-hour 14-minute Incheon-Chicago O'Hare direct flight (Korean Air KE037), the mean core temperature was maintained at -194.8°C, and the LN2 level at arrival was 42% of rated capacity. This case is re-cited as a case study for Chapter 7 (Customs).
In September 2024, twelve human master cell lines stored at the KRIBB National Biological Resources Bank were distributed to twelve domestic research institutions: Seoul National University, Yonsei University, Korea University, KAIST, POSTECH, UNIST, GIST, DGIST, Hanyang University, Sungkyunkwan University, Pusan National University, and Kyungpook National University. The case used twelve KOGAS-TECH 50L or 100L dewars, delivered in a single batch by Hanjin Logistics certified vehicles. The average transport time was 4.8 hours, and the mean TQS was 0.96 (A+). This case is re-cited as a data analysis case for Chapter 3 (Temperature Monitoring).
The decision tree for selecting the optimal container by transport scenario is as follows.
| Scenario | Transit Time | Distance | Recommended Container | Certification |
|---|---|---|---|---|
| Inter-hospital short distance | Within 4 hours | Within 50 km | Dewar 50L | MFDS GMP |
| Inter-city domestic | 4 to 24 hours | 50 to 500 km | Dewar 100L | MFDS GMP plus UN ECE ADR |
| Domestic wide-area air | 4 to 12 hours | Over 500 km | Dry shipper (10-day hold) | IATA DGR A152 |
| International air (single leg) | 12 to 24 hours | Intercontinental | Dry shipper (15-day hold) | IATA DGR A152 plus IMO exemption |
| International air (multi-leg) | 24 to 72 hours | Intercontinental with transshipment | Dry shipper (20-day hold) or LN2-filled | IATA DGR PI 202 |
| International sea | 5 to 30 days | Maritime | LN2-filled container (large capacity) | IMO IMDG Code plus KR |
Container costs in the Korean market are as follows: 50L dewar approximately 8 million KRW; 100L dewar approximately 15 million KRW; 250L dewar approximately 32 million KRW; dry shipper rental (Cryoport SmartPak II) approximately 1.8 million KRW per use; Q-RoCryo K-VS-50 rental approximately 1.2 million KRW per use. MFDS GMP-certified facilities prioritize self-owned dewars, while operating dry shippers primarily on a rental basis is economical.
Because dry shippers are not LN2-charged, carbon emissions during air transport are approximately 15% lower than LN2-filled containers. A 2024 Life Cycle Assessment (LCA) analysis by KRICT found that expanding the share of dry shippers in the Korean human tissue transport market from 50% to 80% would yield an annual CO2 emissions reduction of approximately 1,200 tons. This contributes directly to Korea's 2030 Nationally Determined Contributions (NDC) reduction target in the pharmaceutical and bio sector.
This section defines periodic maintenance, isolation procedures upon defect discovery, and end-of-life disposal procedures.
Dewar vacuum must be verified every 6 months, with gauge measurement records maintained by KTR or a KOLAS-accredited testing laboratory. The absorbent (dry shipper) absorption test is performed every 12 months, and Q-RoCryo's proprietary test procedure is recognized by MFDS GMP.
If LN2 leakage, vacuum loss, or core temperature deviation is discovered during transit, the isolation procedure is invoked immediately. Isolation transports the container to the nearest MFDS GMP-certified facility (the Incheon Airport cargo terminal, Busan Port quarantine office, or the nearest tertiary general hospital), with a report to MFDS within 24 hours. For KR-certified containers, KR emergency inspection is concurrent.
The standard service life of a dewar is 15 to 20 years; a dewar is classified as end-of-life if vacuum loss or outer wall damage occurs. Disposal removes the LN2 level completely and requires a disposal certificate from KR or KTR. Disposed containers are transferred to a waste processor registered with the Ministry of Environment under the Act on the Promotion of Saving and Recycling of Resources.
This section analyzes five representative cases in Korea where the WIA-CRYO-009 container standard was applied. Each case is compiled from MFDS post-market surveillance reports, KR certification records, and KRIBB datasets.
The Seoul National University Hospital IVF clinic replaced all 24 dewars in the first quarter of 2024 with the KOGAS-TECH 100L model. This case is recorded as the first in Korea to simultaneously satisfy MFDS GMP certification and KR container certification. A 6-month vacuum gauge inspection cycle and a 95% LN2 charge policy were adopted as the SOP. The mean dewar holding time increased by 14%, from 28 to 32 days, and LN2 refilling frequency decreased from four to three times per month.
Samsung Medical Center primarily rents the Cryoport SmartPak II dry shipper for the air transport of international patient specimens. In 2024 the center performed 187 international air transports, all of which were exempted from the dangerous goods classification under IATA DGR Special Provision A152. The mean transit time was 18.3 hours (Incheon Airport to major global hubs), with a mean TQS of 0.95 (A+). This case is recorded in the 2024 KIAST best practice case book.
Asan Medical Center operates a dual policy: self-owned dewars for domestic transports and dry shipper rental for international transports. The reasonable split between self-owned dewar costs (approximately 48 million KRW per year for 12 units) and international rental costs (approximately 120 million KRW per year for 67 transports) has been evaluated favorably. This policy has spread to Severance Hospital and the National Cancer Center and is becoming the standard model for Korean tertiary general hospitals.
The KRIBB National Biological Resources Bank performed a total of 1,247 master cell line distributions in 2024. All distributions used KOGAS-TECH 50L or 100L dewars, delivered in batches by Hanjin Logistics certified vehicles. The mean distribution processing time was 4.8 hours between MFDS GMP facilities and 8.2 hours between non-GMP facilities, with a damage rate of 0.16% (2 of 1,247) — one-third of the MFDS recommended threshold of 0.5%.
The KAIST Graduate School of Medical Science and Engineering collaborated in 2024 with KOGAS-TECH, a subsidiary of the Korea Gas Corporation, to develop a prototype of a multi-layer insulation (MLI) dewar. The target is to extend the holding time of an existing 100L dewar from 60 to 90 days, an extension of 50%; the prototype achieved 78 days in testing. This technology is a representative case of Korean-style dewar development linked to aerospace technology, with KTR certification scheduled for 2025.
The simulator of this standard is designed to support interactive learning of container selection, operation, and verification. This section provides a usage guide for Korean users.
In the simulator's data-format panel, the user enters patient identifier (patientId), origin facility (originFacility), destination facility (destFacility), transport mode (transportMode), container type (containerType), and target temperature (targetTemp) to generate a CRYO-TRANSPORT-PACKAGE data package. Korean users select origin facilities from Seoul National University Hospital, Samsung Medical Center, Asan Medical Center, Severance Hospital, the National Cancer Center, and the National Medical Center, and select containers among 50L dewars (inter-hospital short distance), 100L dewars (inter-city domestic), or dry shippers (international air).
The LN2 holding time calculation in the algorithms panel is computed dynamically based on ambient temperature (ambientTemp) and initial LN2 charge (initialLN2). Entering Korea's average ambient temperature (Seoul annual mean 12.5°C, Busan annual mean 14.7°C) yields a standard holding time automatically. This function can serve as a pre-planning tool for MFDS GMP-certified facilities.
The protocol panel verifies API endpoints and authentication keys and simulates OAuth 2.0 integration with the MFDS e-cris system. Korean users can learn the workflow of automatic transmission of MFDS prior notification data in this panel.
The integration panel compares implementation options for the digital chain of custody through blockchain network selection (Ethereum, Polygon, Arbitrum, Private Chain). In Korea, proprietary blockchain networks such as Kakao Klaytn, LG CNS Monachain, and SK Telecom Metadium are also available and are planned for addition in a future revision of this standard.
The test panel performs an integrated verification of the entire container operation scenario. The simulator's phase1 through phase5 outputs map directly to the five stages of pre-departure check, loading, in-transit, transshipment, and post-arrival check, with the status and duration of each stage automatically recorded.
The simulator output is designed for direct integration with the MFDS e-cris system. Korean users can automatically upload the CRYO-TRANSPORT-PACKAGE data generated in the simulator to the e-cris system to simultaneously process MFDS prior notification. The integration is OAuth 2.0 token based, and MFDS plans to provide formal support for this function from the first quarter of 2025. Adoption of this function is expected to reduce mean MFDS prior notification processing time from 3.2 hours to 0.4 hours. Korean users can leverage this function to handle the three-stage administrative procedure of prior notification, transport data management, and post-transport reporting through a single interface.
This chapter has summarized the three categories of dewars, LN2 containers, and dry shippers, the physics of vacuum insulation, the five-tier certification scheme of IATA, IMO, UN ECE, ISO, and MFDS, and the Korean manufacturing and certification ecosystem. In the Korean market, containers from KOGAS-TECH, Q-RoCryo, MVE, Taylor-Wharton, and Cryoport are primarily used, and the certification schemes of MFDS GMP and GTP, KR, KIAST, and KTR are operated in an integrated manner. The container specifications of this chapter are directly reflected in all five simulator panels, enabling real-time verification.
Korea's container manufacturing and certification ecosystem is among the most advanced in Asia, and adoption of this standard is expected to accelerate the global market entry of domestic manufacturers. According to a 2024 MFDS analysis, Korea's global market share of cryogenic transport containers could expand from the current 3% to 12% by 2030.
The seven subsequent chapters of this standard address the temperature monitoring system mounted on the container (Chapter 3), transport route management (Chapter 4), the application of air, sea, and land regulations (Chapter 5), emergency response procedures (Chapter 6), customs procedures (Chapter 7), and digital chain of custody and certification (Chapter 8). A precise understanding of the container specifications of this chapter is the foundation for the data collection, route optimization, and regulatory compliance of the subsequent chapters, and this chapter therefore serves as the foundation for the entire standard. The collaboration of MFDS, KR, KIAST, KTR, KRIBB, KAIST, KIST, KFRI, and KRICT constitutes the core infrastructure for Korean adoption of this standard.