In food processing and export, post-harvest preservation is the biggest challenge Vietnamese businesses face. Traditional freezing methods leave unwanted consequences: drip loss, reduced sweetness, loss of natural colour and lower nutritional value after thawing. That directly weakens the competitiveness of Vietnamese agricultural and seafood products in demanding markets such as the EU, Japan and the United States.
To solve this problem completely, CAS (Cells Alive System) freezing technology was developed, bringing a genuine revolution to refrigeration. It does more than chill: the CAS system performs something close to magic — "freezing time", letting food hibernate and come back intact after years.
So what is CAS technology? What makes it fundamentally different from IQF fast freezing? Let the specialist engineers at Tan Long take you through it in detail below.
What is CAS freezing technology?
CAS freezing technology (Cells Alive System) is recognised as one of the most advanced freezing systems available, a major breakthrough in preservation. In essence, CAS applies magnetic field energy combined with very small oscillating waves to control precisely how the water molecules inside the food move. This unique mechanism completely prevents large ice crystals forming, so the cell membranes are not pierced or broken during deep freezing. As a result, food after thawing keeps 99% of its freshness, natural flavour, colour and original structure, as if it had just been harvested.
The system was invented and developed by the ABI corporation in Japan — a country with some of the world’s strictest food quality standards, particularly given its culture of eating premium raw seafood as sashimi and sushi. CAS was originally developed mainly for preserving bluefin tuna. But because it worked far better than anyone expected, it spread quickly into other fields: export agricultural supply chains, medicine and biological pharmaceutical storage worldwide.
The core difference that makes CAS freezing technology superior to older methods lies in how it intervenes physically. Where air blast freezer (air blast) systems and traditional rapid freezing (IQF) lines mainly focus on dropping the surrounding temperature very fast (to −35°C to −45°C) so the surface freezes first and the cold works inwards to the core, the CAS system works quite differently. It uses a special magnetic field to act directly on the water molecules at cell level, so the water freezes uniformly from the inside out without destroying the muscle tissue structure. Integrating this system into projects for cold storage to a proper standard is becoming the natural route for businesses raising the value of their goods on international markets.
The breakthrough principle behind the CAS system
To understand why CAS freezing technology is called the "time machine" of the cold storage and food preservation industry, we need to look closely at the applied quantum physics and thermodynamics inside the system.
Any fresh food — meat, fish, fruit — contains a great deal of water, from 60% to 90%. Ordinarily, when the temperature falls past the freezing point (0°C to −5°C), the water molecules bond together into ice crystals. With traditional fast freezing alone, those crystals tend to grow large and form sharp angular structures. They act, in effect, like tiny blades cutting through the cell walls.
System CAS freezing technology solves this difficult problem through a sophisticated three-stage process:
- Stage 1 – Creating micro-oscillation: The machine generates a weak magnetic field closely combined with low-frequency sound waves. This particular magnetic force acts directly on the water molecules inside the food, forcing them to rotate and oscillate continuously.
- Stage 2 – Supercooling: Because the water molecules are forced to keep moving, the system can take the product core temperature far below 0°C while the water inside the cells stays liquid rather than freezing immediately.
- Stage 3 – Uniform crystallisation: The moment the system switches off the oscillating waves, or the room reaches its target deep-freeze temperature (usually −55°C to −60°C), every water molecule in the food freezes solid at the same instant. Thanks to CAS freezing technology, the ice crystals formed are perfectly spherical and extremely small (micro-crystals), with no sharp edges to tear the cell membranes.
The result is remarkable: the food’s cell network is preserved completely intact. When the consumer or the plant thaws it, the water soaks slowly back into the muscle tissue with no drip loss at all, so the product keeps its texture, colour and fresh flavour exactly as it was at harvest.
CAS compared with traditional freezing (IQF / air blast)
To give business owners the clearest possible view before investing, here is a comparison of CAS and fast freezing as traditionally applied in cold storage Currently:
| Assessment criterion | Traditional freezing (air blast / IQF) | CAS freezing technology |
| Mechanism of action | High-velocity cold air to drop the temperature | Deep-freeze air combined with an oscillating magnetic field |
| Ice crystal size | Large and sharp (breaks the cell structure) | Very small and spherical (protects the cells) |
| Condition after thawing | Heavy drip loss (5%–15%), mushy flesh, loss of sweetness | No drip loss (drip loss < 1%), firm flesh, fresh taste |
| Storage time | 6 months – 1 year (quality declines steadily) | Up to 3 – 5 years (quality unchanged) |
| Weight loss | High loss through surface moisture evaporation | Loss close to 0% |
| Initial investment cost | Low to moderate | High (requires a magnetic field generator and purpose-made evaporators) |
| Application segmentation | Commodity goods, prepared food, supermarkets | Premium goods (sashimi, export produce, medical) |
(Data sources: the Agricultural Science and Technology Institute & Japanese assessment standards).
The outstanding advantages of CAS freezing for a business
Although the initial equipment cost is higher than a conventional cold storage system, the economic value and return on investment (ROI) that CAS freezing technology delivers in logistics and export supply chains is undeniable. Here are the core benefits that make it an investment worth making:
- Full retention of nutritional and sensory value: This is the technology’s core value. Because the cell membranes are protected, fruit does not go soft or darken through oxidation. Premium products such as Wagyu beef or bluefin tuna keep their bright red colour, with the fat and lean tissue firm and not separating. Preserving the cell structure means the food does not lose its vitamins and amino acids.
- Shelf life extended to several years: With CAS freezing technologyapplied, biological oxidation inside the food is almost entirely halted. A batch of whole durian segments or lychees can hibernate for 2–3 years and still, on thawing, taste as good as freshly picked. This lets produce businesses finally solve the perennial problem of a good harvest meeting a poor price: they can hold stock safely and release it to the market when supply is scarce and prices are high.
- Higher export value (premium pricing): Food treated with this advanced system is not lumped in with "ordinary frozen goods" on international markets but assessed in the higher category of "fresh produce held long term". A business can sell at 30% to 50% above the price achieved with traditional IQF freezing, and clears the demanding technical standards of the FDA (United States) and the EU far more easily.
- Lower running costs and higher profit: Despite the initial outlay, minimising drip loss recovers the investment remarkably quickly. Take a practical example: if you export 100 tonnes of tuna, conventional thawing loss of 10% means 10 tonnes of fish lost outright. With CAS freezing technology, that loss falls to almost zero. The enormous value of those 10 tonnes of premium tuna, saved, is the extra net profit a business earns by adopting the right technology.
CAS freezing technology in practice in Vietnam
In the Vietnamese market, CAS freezing technology is moving out of the research laboratory to become the "secret weapon" giving large processing and export groups an enormous competitive advantage. Rather than relying entirely on older methods, the system is being applied with great success in three key sectors:
- Export produce (particularly tropical fruit): Vietnam is proud to be a leading fruit exporter, with durian, dragon fruit, lychee and mango among its main products. But thin skins, high water content and a tendency to ferment make fresh export logistics enormously challenging. When CAS freezing technology is integrated into cold storage systems for produce, durian segments still have their soft texture, deep yellow colour and characteristic aroma after months of "hibernation", while lychees show no skin darkening or flesh splitting at all.
- Premium seafood processing: For Vietnam’s high-value seafood — black tiger prawn, Phú Yên bluefin tuna, squid, crab — bringing CAS freezing technology into the production line in place of conventional rapid freezing systems has let the finished product meet the demanding standard for eating raw (sashimi grade). That opens the door to exporting directly to Japan and the United States. Shrimp in particular show no black head after thawing, with firm flesh and the full natural sweetness of fresh seafood.
- Medicine and biological pharmaceuticals: Beyond food, this technology plays a key part in the medical cold chain. Deep-freeze temperatures combined with a magnetic field work particularly well for preserving stem cell samples, organ samples, blood banks and biological vaccines. The process meets extremely strict temperature requirements while ensuring the living material is not killed.
CAS freezing system solutions from Tân Long Refrigeration Electromechanical
Designing and installing a freezing line with CAS freezing technology integrated demands extremely rigorous thermodynamic calculation, careful choice of insulation, and above all perfect synchronisation between the mechanical refrigeration system and the magnetic field module. With more than 20 years of hands-on experience designing and building industrial cold storage , Tân Long Refrigeration Electromechanical Joint Stock Company is proud to be among the first to bring modern, optimised freezing solutions to Vietnamese businesses.
Tân Long’s capability on premium projects applying CAS freezing technology shows in these core strengths:
- Tailored, in-depth solution consulting: Our experienced engineers analyse the biological characteristics of each food closely — specific heat, size, freezing point — to set and calibrate the magnetic field parameters of the CAS freezing technology as precisely as possible.
- Turnkey installation: We supply everything as a matched package, from the high-density insulated panel envelope with the CAS magnetic field module correctly integrated, to the refrigeration compressor imported complete from leading European and Japanese brands (Bitzer, Mycom, GEA).
- Intelligent control panel integration: Advanced automation through PLC control cabinet and SCADA software. This lets the business owner follow every operating parameter, monitoring deep-freeze temperatures and oscillation frequency remotely 24/7, in complete safety.
- A lasting commitment: Scheduled maintenance to proper refrigeration industry standards, with a commitment to attend quickly when something goes wrong, so the plant’s production line is never interrupted.
Do not let outdated systems erode the core value of your goods. Contact Tân Long’s specialists now on the hotline: (+84) 933 357 058 or by email: info@tanlongvn.com for FREE ADVICE and to arrange a site survey for your freezing system today.
Frequently asked questions about CAS freezing technology
Is a CAS system expensive to install?
Compared with an ordinary cold store or blast freezing tunnel, a CAS system costs 1.5 to 2.5 times more to install depending on capacity. Seen in terms of ROI, however, CAS lets a business sell at 30% more and cuts drip loss from 10% to 0%. In practice, businesses typically recover the extra investment within 1–2 years of operation.
Does CAS use more electricity than ordinary freezing?
The magnetic field and ultrasonic wave generators in a CAS system use very little energy. Moreover, because uniform crystallisation happens extremely quickly once supercooling is reached, the compressor actually runs for less time. So on total electricity consumption per kilogram of finished product, CAS is comparable to — or even more economical than — an older blast freezing tunnel.
Which foods most justify investing in CAS?
The technology delivers the greatest financial value on mid- and high-end products that are expensive or structurally fragile. Typical examples: bluefin tuna, lobster, abalone, Wagyu beef, whole durian segments, strawberries and premium mushrooms. For low-cost commodity products (export pangasius fillets, mixed vegetables), an IQF line remains the more economical choice.
Frequently asked questions about CAS technology
What is CAS freezing technology?
CAS (Cells Alive System) is a freezing technology that combines cooling with an energy field acting on the water inside the cells, limiting the formation of large ice crystals so the cell structure survives thawing intact.
How does CAS differ from ordinary freezing?
Ordinary freezing only drops the temperature quickly; ice crystals still form and can damage the cells. CAS additionally makes the water freeze all at once as very small crystals, so the product stays noticeably fresher after thawing.
What are the advantages of CAS?
It preserves colour, flavour and texture close to the fresh product, reduces drip loss on thawing, and extends the storage life of high-value goods.
Which products suit CAS?
Mainly produce, seafood and high-value food aimed at export, where the difference in quality after thawing is enough to justify the higher investment.
What are the drawbacks of CAS technology?
Capital and running costs are higher than traditional freezing, and it demands specialist operating and maintenance skills, so it only pays where the product value is high enough.
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Engineer Nguyen Toan Thinh (Technical Director)
With over 18 years of practical experience in directing, consulting, designing, and constructing heavy industrial refrigeration systems, ASRS automated warehouses, and IQF freezing systems across more than 29 major national projects.
