Si vous devez expédier des vaccins, échantillons de fruits de mer ou de biotechnologie, vous vous demandez peut-être comment les conserver congelés sans fuite de glace ni réglementations compliquées. Un sac de glace carbonique flexible enveloppe le dioxyde de carbone solide (Co₂) dans une feuille de polymère moulable pour offrir un refroidissement ultra froid qui reste sec et réutilisable. Contrairement aux packs de gel ordinaires, ces packs atteignent des températures aussi basses que –78,5 °C et peuvent être réutilisés 30 fois. Dans 2025, la demande mondiale de glace sèche augmente 5 % chaque année alors que l’offre de CO₂ n’augmente que 0.5 %, provoquant des flambées de prix. Ce guide explique ce que packs de glace carbonique flexibles sont, comment les choisir et les dimensionner, règles de sécurité, quand utiliser des alternatives et les dernières innovations.
Qu'est-ce qui différencie un sac de glace carbonique flexible des packs de gel ou de la glace carbonique solide? En savoir plus sur la technologie des polymères, plage de température et réutilisabilité.
Comment dimensionner et appliquer des blocs de glace carbonique flexibles pour votre envoi? Obtenez des ratios de poids, directives d'épaisseur et conseils pratiques pour la nuit, transit de deux jours et trois jours.
Quelles réglementations et mesures de sécurité s'appliquent aux blocs de glace carbonique flexibles? Comprendre les étiquettes de danger, ventilation requirements and handling precautions.
When should you use flexible dry ice packs versus gel packs or phase change materials? Compare cooling methods, costs and sustainability.
Quoi 2025 trends and innovations are reshaping flexible dry ice packs? Explorez la croissance du marché, CO₂ biosourcé, smart sensors and hybrid systems.
What Are Flexible Dry Ice Packs and How Do They Work?
Réponse directe
Flexible dry ice packs are thin blankets filled with solid CO₂ or advanced phase change polymers that maintain ultra low temperatures while remaining bendable and reusable. They combine a super absorbent polymer core with perforated plastic and non woven textile layers. When soaked in warm water, the polymer cells swell to form a padded sheet weighing about 900 g. Une fois congelé, the water and CO₂ inside the cells turn into dry ice; the sheet stays flexible and conforms to irregular products. Parce que la neige carbonique se sublime directement du solide au gaz, il n'y a aucun résidu liquide, so packages stay clean.
Explication détaillée
Flexible dry ice packs differ fundamentally from conventional gel packs and solid dry ice. Solid dry ice is pure frozen CO₂ at –78.5 °C; it provides intense cooling but sublimates quickly and cannot be refrozen. Packs de gel, often marketed as “dry ice packs,” use water based gel to hold temperatures around 0 °C and are reusable but cannot achieve ultra cold ranges. Flexible dry ice sheets bridge the gap: modern versions hold temperatures of –12 °C to –18 °C for up to 48 heures et peut être réutilisé pendant 30 cycles avec moins de 10 % perte de capacité. The sheets remain pliable when frozen, allowing you to wrap them around odd shaped items such as vials or fish fillets. Quand la neige carbonique se sublime, il absorbe 571 kJ per kilogram of heat, maintaining deep freeze conditions without moisture.
Flexible dry ice technology relies on cross linked polyacrylate polymers et micro perforated plastic. A 4 ply sheet such as Techni Ice HDR uses two non woven textile layers encapsulating a special refrigerant, with two heavy duty plastic layers fused to the textile. The cross linked polymer can reach temperatures as low as –190 °C—more than twice as cold as regular dry ice. To activate, you immerse the sheet in warm water until air bubbles escape; the polymer swells to create multiple sealed cells. Après congélation, the sheet becomes a flexible cold blanket that can be cut between the cells and reused.
Layered architecture and polymer technology
Anatomy of a flexible dry ice pack:
| Couche | Composition | Rôle | Importance pratique |
| Outer plastic | Perforated polyethylene or polypropylene | Allows water to penetrate during hydration and contains the polymer | Ensures the sheet can be activated and remains leak proof |
| Inner textile | Non woven fabric | Encapsulates the polymer and provides flexibility | Enables bending around irregular items and enhances durability |
| Polymer core | Cross linked polyacrylate or other sodium polyacrylate copolymer | Absorbs water and converts to dry ice during freezing | Delivers ultra cold temperatures and reusability |
| CO₂ or PCM infusion | Solid CO₂ or phase change material within the polymer cells | Provides the cooling power; sublimates or changes phase | Maintains –78.5 °C to –12 °C without melting |
This structure gives flexible dry ice packs several advantages:
Moldability: Sheets can wrap around products, reducing dead space and improving temperature uniformity.
Lightweight activation: Dehydrated sheets weigh around 40 g; after hydration they weigh about 900 g, so shipping weight remains manageable.
Pas d'eau de fusion: Quand la neige carbonique se sublime, ça se transforme en gaz; there is no liquid to wet the package.
Rehydration and reuse: Cells can be rehydrated multiple times without losing capacity.
Comparison of cooling methods
| Attribut | Flexible dry ice pack | Pack de gel | Matériau à changement de phase (PCM) paquet | Signification pour vous |
| Plage de température | –78,5 °C à –20 °C | 0 °C à 5 °C | –20 °C à –70 °C (engineered set points) | Choose dry ice packs for ultra cold shipping; packs de gel pour produits réfrigérés; PCMs for strict moderate ranges |
| Durée de refroidissement | 24–72 h selon épaisseur | 12–48 h | 24–72 h with proper conditioning | Match duration to your transit time; thicker dry ice sheets last longer |
| Réutilisabilité | Polymer casing can be rehydrated; CO₂ must be replenished | Fully reusable; refreeze after use | Réutilisable; PCMs can be conditioned repeatedly | Tenir compte du coût total et de la durabilité |
| Statut de danger | Classe 9 matières dangereuses; requires UN 1845 étiquetage et ventilation | Non dangereux; facile à manipuler | Généralement non dangereux; some PCMs are food safe | Factor in regulatory compliance and handling effort |
| Résidu | Se sublime en gaz CO₂; pas de liquide | Fond dans l'eau; risque de fuites | Généralement aucun résidu; PCMs absorb heat internally | Keep packaging dry and avoid soggy boxes |
| Typical use cases | Produits pharmaceutiques surgelés, biologics and specialty seafood | Kits de repas, fresh produce and 2–8 °C medications | Vaccines requiring strict 2–8 °C or –20 °C ranges | Pick based on temperature sensitivity and regulatory complexity |
How to Choose and Size Flexible Dry Ice Packs for Your Shipment?
Réponse directe
Size your flexible dry ice packs by matching the weight of dry ice to your payload and choosing sheet thickness based on transit duration. A common guideline is a 1:1 ratio of dry ice weight to product weight for overnight deliveries, increasing to 1.5–2:1 pour les expéditions sur plusieurs jours. Sheet thicknesses of 12 mm, 18 mm and 24 mm correspond to approximately 24 , 48 and 72 hour hold times respectively. Always pre chill your product and container to reduce the thermal load and place dry ice sheets above the payload so cold air can sink.
Explication élargie
When sizing flexible dry ice packs, start by classifying your product’s temperature needs. Frozen biologics and seafood require temperatures below –20 °C, while fresh produce or meal kits need 2–8 °C refrigeration. Pour les envois ultra froids, flexible dry ice sheets deliver the necessary environment. The quantity of dry ice depends on payload weight and transit time. According to Tempk’s guideline, use half the payload weight in dry ice for shipments under 12 heures, equal weight for 24–48 hours and up to 1.5 times for 48–72 hours. Par exemple, if you’re shipping a 10 lb biotech kit overnight, utiliser environ 5 LB de glace sèche; for a 48 hour transit, utiliser environ 10 kg; for a 72 hour transit, utiliser autour 15 kg.
Sheet thickness also matters. UN 12 mm sheet lasts roughly one day; un 18 mm sheet lasts two days; et un 24 mm sheet lasts three days. Thicker sheets contain more CO₂ and reduce sublimation rate. Combine multiple thin sheets when thicker sheets aren’t available. Always pre condition your container by chilling it and your product for at least 24 heures avant d'emballer. This reduces the heat load and slows sublimation. Minimize empty space in the container using insulation or padding to prevent warm air pockets. Ensure the container has vents or pressure relief channels to allow CO₂ gas to escape.
Sizing guidelines and scenarios
| Durée du transit | Épaisseur de tôle recommandée | Dry ice weight per kilogram of product | Applications typiques |
| < 12 heures | 12 mm sheet or half sheet | 0.5 kg de neige carbonique par kg de produit | Overnight medical samples, short haul seafood |
| 24–48 heures | 18 mm feuille ou deux 12 couches de mm | 1–1,5 kg de neige carbonique par kg de produit | Two day meal kits, vaccines shipping internationally |
| 48–72 heures | 24 mm feuille ou trois 12 feuilles mm | 2 kg de neige carbonique par kg de produit | Three day shipments of mRNA vaccines, thérapies cellulaires |
Conseils et suggestions pratiques
Hydrate correctly: Soak the sheet in warm water for about 15 minutes, gently scrunching it so all cells fill. Remove when it indents under light pressure; over hydration can make cells prone to puncture.
Pre freeze thoroughly: Freeze the hydrated sheet for at least 24 hours at –20 °C or colder. This ensures uniform dry ice formation and reduces early sublimation.
Positionner stratégiquement: Place the sheet above the product so cold air sinks around it. Use additional sheets below for long transit times.
Couper pour s'adapter: Use the perforated cells to cut the sheet around irregular items; seal cut edges with tape to prevent gel loss.
Rotation de l'inventaire: Keep at least two sets of sheets so one can be freezing while the other is in use.
Cas du monde réel: A biotechnology company shipping 25 lb of cell culture kits across the U.S. utilisé 30 lb of flexible dry ice sheets and pre chilled containers. The shipment maintained sub zero temperatures for 60 heures avec seulement 5 % dry ice loss.
Sécurité, Handling and Regulatory Requirements
Réponse directe
Flexible dry ice packs contain dry ice, which is regulated as a Class 9 matières dangereuses. Les colis doivent afficher la désignation d'expédition appropriée « dioxyde de carbone, solide » ou « neige carbonique," le numéro ONU 1845 et le poids net de neige carbonique. Ventilation is crucial: ne jamais sceller la neige carbonique dans un récipient hermétique; provide pressure relief vents so CO₂ gas can escape. Portez des gants isolants et des lunettes de protection lors de la manipulation des feuilles.
Explication élargie
Although flexible dry ice sheets simplify handling, they do not change the underlying hazards of dry ice. La glace sèche sublime dans le gaz co₂, which can displace oxygen and cause suffocation in confined spaces. Always work in well ventilated areas and avoid breathing the gas. Airlines and couriers limit the amount of dry ice per package—typically 2.5 kg for passengers and up to 200 kg for commercial shipments. Lors de l’expédition d’échantillons biologiques, le triple emballage est obligatoire: un réceptacle primaire étanche, a secondary container with absorbent material and a strong outer box. Flexible dry ice packs also require hazardous materials training for anyone preparing shipments.
Regulatory compliance checklist
| Exigence | Détails | Pourquoi ça compte |
| Nom d'expédition approprié & Numéro de l'ONU | Étiquetez les emballages comme « glace sèche » ou « dioxyde de carbone », solid” and include UN 1845 | Garantit la conformité et évite les amendes |
| Déclaration du poids net | Record the dry ice weight on the package (Par exemple, 5 kg) | Allows carriers to verify weight limits |
| Classe 9 étiquette de danger | Utilisez au moins une étiquette en forme de losange 100 mm par côté | Alerte les gestionnaires des dangers potentiels |
| Ventilation | Use vented packaging or pressure relief valves | Empêche l'accumulation de pression et la suffocation |
| Équipement de protection individuelle (EPP) | Portez des gants isolés et des lunettes de protection lors de la manipulation de glace carbonique | Prévient les engelures et les blessures |
| Entraînement & documentation | Ensure handlers are trained and include required paperwork | Maintient la sécurité et la conformité légale |
Safety tips for users
Utiliser des conteneurs ventilés: Never seal dry ice sheets inside airtight plastic bags or jars.
Surveiller les niveaux de CO₂: Use CO₂ monitors in storage areas, especially inside vehicles or small warehouses.
Limit quantities on aircraft: Les passagers peuvent porter 2.5 kg of dry ice without documentation; commercial shipments can carry up to 200 kg.
Éliminer de manière responsable: Allow leftover dry ice to sublimate outdoors or in a vented space; never flush it down the drain.
Formez votre équipe: Personnel should complete hazardous materials training and update procedures regularly.
When to Use Flexible Dry Ice Packs vs. Gel Packs or PCMs?
Réponse directe
Use flexible dry ice packs for shipments requiring ultra cold temperatures (en dessous de –20 °C) or extended frozen conditions; use gel packs or PCMs when products need chilled or moderate temperatures with simpler handling. Flexible dry ice packs excel at keeping vaccines, mRNA therapies and frozen seafood at –78.5 °C to –20 °C for up to 72 heures. Gel packs maintain 0–5 °C for 12–48 hours and are non hazardous. PCMs hold narrow set points (2–8 °C ou –20 °C) for 24–72 hours and are reusable.
Explication élargie
Selecting the right refrigerant depends on temperature requirements, durée, regulatory complexity and cost. Gel packs are ideal for meal kits, produce and pharmaceuticals requiring 2–8 °C; they’re non toxic, réutilisable et facile à manipuler. Cependant, they offer limited hold times and may leak water. Flexible dry ice packs deliver the lowest temperatures without moisture and mold to irregular shapes, but they are classified as hazardous materials and require labeling and training. PCMs offer a compromise by providing stable temperature bands (Par exemple, –20 °C ou +5 °C) pendant 24 à 72 heures, but they generally cannot reach the –78.5 °C needed for deep frozen biologics. Hybrid systems combine PCMs and dry ice sheets; a PCM layer buffers the payload, while a dry ice sheet on top extends freezing by 40 %.
Advantages and disadvantages of each cooling method
Flexible dry ice packs: Ultra cold temperatures, conform to products, aucun résidu d'eau; require hazard labeling and ventilated packaging.
Packs de gel: Réutilisable, non hazardous and cost effective; limited hold time and risk of leaks.
PCMS: Maintain specific temperature bands and are reusable; higher upfront cost and narrower applicability.
Packs d'eau: Cheap and simple; suitable for very short chilled shipments but melt quickly and can leak【811187269995851†L91-L93】.
Hybrid solutions for mixed loads
Hybrid systems are increasingly common, especially for mixed shipments. Par exemple, a meal kit company may use a PCM pack to keep vegetables at 2–8 °C and a flexible dry ice sheet to keep frozen meats below –20 °C. Hybrid configurations can reduce dry ice usage by up to 40 % and lower the risk of supercooling. They also simplify compliance for the non hazardous portion of the shipment. When designing a hybrid packout, place the PCM or gel pack closer to temperature sensitive items and the dry ice sheet above everything else; use partitions to separate zones.
2025 Trends and Innovations Shaping Flexible Dry Ice Packs
Aperçu de la tendance
The flexible dry ice pack industry is undergoing rapid change as supply constraints, sustainability and digitalization drive innovation. Dry ice consumption is rising about 5 % par année, alors que l'offre de CO₂ augmente seulement 0.5 % par année, causing shortages and price volatility up to 300 %. Le marché mondial de la glace carbonique, valorisé à USD 1.54 milliards en 2024, devrait atteindre USD 2.73 milliards 2032 (7.4 % TCAC). Entre-temps, the cold chain packaging refrigerants market—including dry ice, gel packs and PCMs—is forecast to grow from USD 1.57 milliards en 2024 en USD 2.92 milliards 2032 (8.14 % TCAC), with Europe holding a 31.85 % partager. In personal therapy, the reusable ice pack market is expected to grow from USD 1.2 milliards en 2024 en USD 2.14 milliards 2032, un 7.5 % annual rate.
Dernières avancées en un coup d'œil
Localized CO₂ sourcing: Producers are building regional CO₂ capture hubs and capturing emissions from bioethanol fermentation to supply dry ice. Bioethanol plants can supply 30–60 % of a country’s CO₂ needs.
Polymères biodégradables: Manufacturers are adopting compostable or recyclable materials for sheet casings, reducing waste and appealing to eco conscious customers.
Systèmes de refroidissement hybrides: Shippers mix dry ice sheets with PCMs to extend freezing by 40 % and reduce dry ice consumption.
Panneaux d'isolation sous vide (Vips): High performance insulation reduces sublimation loss from 8 % à 3 % par jour, permettant des colis plus légers.
Surveillance intelligente: Flexible sheets are increasingly embedded with temperature, humidity and location sensors that transmit data for real time intervention.
IA et optimisation des itinéraires: Sophisticated software models evaluate variables such as route length, ambient temperature and container insulation to recommend the optimal mix of dry ice sheets, PCMs and container types.
Insistance au marché
Supply shortages and sustainability pressures are pushing the industry toward alternative CO₂ sources and hybrid systems. Centres de production localisés reduce transport losses and respond to regional demand. On site CO₂ capture at food processing plants and breweries reuses emissions and stabilizes supply. CO₂ biosourcé from fermentation reduces reliance on fossil fuels and lowers the carbon footprint. Cependant, geopolitical factors can threaten local supply: au Royaume-Uni, a trade deal allowing cheap U.S. bioethanol imports jeopardizes domestic CO₂ producers, which supply 30–60 % du CO₂ du pays. Shippers therefore diversify their refrigerants and invest in better insulation to mitigate supply risks.
Questions fréquemment posées
Q1: Are flexible dry ice packs reusable?
The polymer casing can be rehydrated and refrozen multiple times, but the dry ice itself sublimates, so you must replenish the CO₂ for each use. For true reusability without replenishing, consider gel or PCM packs.
Q2: How long do flexible dry ice packs stay cold?
Une feuille correctement dimensionnée maintient des températures ultra froides pendant 24 à 72 heures.. UN 12 mm sheet lasts about one day, un 18 mm sheet two days and a 24 mm sheet up to three days.
Q3: How do I activate and hydrate a flexible dry ice pack?
Soak the sheet in warm water for roughly 15 minutes, gently scrunching until the cells fill and air bubbles escape. Une fois hydraté, congelez-le pendant au moins 24 heures avant l'utilisation.
Q4: Are flexible dry ice packs safe for food contact?
Oui. High quality sheets use food grade polymers sealed within plastic. They do not leak harmful substances and leave no liquid residue.
Q5: What are the main safety precautions when using flexible dry ice packs?
Portez des gants isolés et une protection des yeux, ensure containers are vented, étiqueter les colis avec UN 1845 and record the net weight of dry ice. Let unused dry ice sublimate outdoors.
Résumé et recommandations
Principaux à retenir
Flexible dry ice packs combine ultra cold cooling with moldable, reusable polymer sheets, delivering temperatures down to –78.5 °C without water residue.
They suit frozen pharmaceuticals, produits biologiques et fruits de mer requiring 24–72 hour protection; size the sheet using a 0.5–2:1 dry ice to product weight ratio and choose 12–24 mm thickness based on duration.
Safety and compliance are essential: label shipments with “dry ice,"Et 1845 et poids net, provide ventilation and wear PPE.
Gel packs and PCMs provide moderate temperatures and reusability; use them when your cargo needs 2–8 °C or strict temperature bands.
2025 trends favor hybrid systems, localized CO₂ sourcing, biodegradable materials and smart sensors to mitigate supply shortages and environmental impact.
Des conseils concrets
Evaluate your product’s temperature tolerance and transit time. Use the sizing table to match sheet thickness and dry ice weight to your payload and adjust for seasonal conditions.
Investissez dans une isolation de qualité. Vacuum panels or recyclable liners reduce sublimation and allow you to use thinner sheets.
Train and equip your team. Ensure everyone who packs or ships flexible dry ice packs completes hazardous materials training and uses proper PPE.
Explorez les solutions hybrides. Combine flexible dry ice sheets with PCMs or gel packs to extend hold time and reduce CO₂ usage.
Monitor market trends and innovations. Keep up with local CO₂ sourcing, biodegradable polymers and smart sensor integration to stay competitive and sustainable.
Suggestions de liens internes
Consider linking to guides on packs de gel vs glace carbonique for more insights into moderate temperature shipping.
Provide an internal link to a sizing calculator tool where readers can input payload weight and transit time to choose the right sheet thickness.
Link to case studies about hybrid PCM and dry ice systems for mixed shipments.
Connect to an article on cold chain sustainability to show how eco friendly materials improve packaging.
Link to a how to on hazard labeling and documentation for regulated shipments.
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À propos du tempk
Tempk is a cold chain packaging specialist dedicated to preserving product quality during transit. We design flexible dry ice packs, packs de gel, PCMs and insulated containers that cater to temperature ranges from 0 °C jusqu'à –78,5 °C. Notre R&D team innovates with biodegradable polymers, smart sensors and hybrid cooling solutions to reduce waste and improve performance. With global certifications and decades of experience, nous soutenons les produits pharmaceutiques, food and biotech clients by delivering customizable packaging solutions that balance cost, conformité et durabilité.
Appel à l'action: Prêt à optimiser votre chaîne froide? Contact Tempk’s experts for personalized advice on flexible dry ice packs, sizing strategies and hybrid cooling systems. We’ll help you choose the right solution, comply with regulations and meet your sustainability goals.
