72 Pacote de gelo seco por hora: How to Keep Goods Frozen for 72 Horas
Introdução: When you need to ship frozen food, vaccines or lab samples across the country, maintaining sub zero temperatures for three days is no small task. A 72 hour dry ice pack can keep products frozen for up to 72 hours when combined with the right insulation and handling. Understanding how dry ice works, how much is needed and how to comply with safety rules is essential. This article explains everything you need to know about using a 72 hour dry ice pack—from simple calculations to cutting edge 2025 innovations—so your products arrive frozen and safe.
What is a 72 hour dry ice pack and how does it work? — explore solid carbon dioxide and sublimation properties.
How do you calculate the amount of dry ice for 72 hour shipping? — learn simple rules of thumb based on payload weight and transit time.
Which insulated packaging works best for 72 hour dry ice packs? — compare materials and designs for long duration shipping.
What safety and regulatory rules apply to 72 hour dry ice packs in 2025? — understand labeling, hazardous material limits and handling tips.
Quais são as últimas 2025 trends and innovations for long duration dry ice shipping? — discover smart sensors, hybrid cooling and market growth.
What is a 72 hour dry ice pack and how does it work?
Resposta direta: UM 72 hour dry ice pack is a shipping method that uses dry ice to keep products frozen for approximately three days. Gelo seco é sólido dióxido de carbono (Co₂) that sublimates—turns directly from a solid to a gas—at −78.5 °C. Because it doesn’t melt into water, dry ice provides cold without moisture and can maintain goods below freezing for 24 72 hours depending on quantity and insulation. This makes it ideal for shipping frozen foods, biological samples or pharmaceuticals over long distances.
Detailed explanation: Quando o gelo seco sublima, it absorbs large amounts of heat, keeping the surrounding environment cold. The sublimation rate depends on ambient temperature, container insulation and the size of the dry ice pieces. Menor, uniform pieces sublimate more slowly because they have less exposed surface area. In a 72 hour dry ice pack, the dry ice is typically placed on top of the payload inside an insulated container; Air frio afunda, so positioning the dry ice above the goods ensures even freezing. Para durações mais longas, dry ice may be placed both above and below the product. Unlike gel packs, which maintain temperatures above 0 °C, dry ice can keep contents below zero for days. No entanto, it must be handled carefully—unventilated containers can explode, and direct contact with dry ice can cause frostbite.
Dry ice chemistry and sublimation
Dry ice sublimates because CO₂ molecules transition directly from solid to gas at low pressure. At sea level, this transition occurs at −78.5 °C. Sublimation absorbs heat from the surroundings (latent heat of sublimation ~571 kJ/kg), which draws thermal energy away from your shipment. The absence of liquid water means there’s no messy melt water to damage packages or products. Dry ice pieces for shipping are available as blocks, slices or pellets. Blocks last longer but are harder to pack around irregularly shaped products; pellets provide better distribution but sublimate faster. A typical 72 hour dry ice pack usa 1.5 times the product’s weight in dry ice and high performance insulation.
| Dry Ice State | Sublimation Point | Cooling Time Range | Practical Benefit to You |
| Block or Slice | −78.5 °C (−109.3 °F) | 48–72 hours with good insulation | Lasts longest; ideal for large payloads that need sustained freezing. |
| Pellets | −78.5 °C | 24–48 horas | Provides uniform cold distribution but sublimates faster due to greater surface area. |
| Chips/Crushed | −78.5 °C | <24 horas | Fills voids easily; useful for short shipments or filling gaps but not suitable for 72 horas. |
Dicas e sugestões práticas
Choose proper dry ice form: Por um 72 hour dry ice pack, opt for blocks or large slices rather than pellets, as they sublimate more slowly and maintain cold longer.
Position dry ice correctly: Place most of the dry ice on top of the payload since cold air sinks. For heavy shipments (>30 Libra), place some dry ice at the bottom as well.
Não sele aeronave: Always vent the container; Co₂ o gás deve escapar. Use insulated containers with venting features or leave small gaps in the lid.
Exemplo de caso: A biotech firm shipped vaccine samples cross country by packing vials in a polyurethane insulated box with 1.5 times the product weight in dry ice. They used vented packaging and followed International Air Transport Association (IATA) labeling rules. The shipment maintained temperatures below −20 °C for 72 hours and arrived intact.
How do you calculate dry ice for a 72 hour shipment?
Resposta direta: You calculate dry ice for a 72 hour dry ice pack by multiplying the payload weight by 1.5. Industry guidelines recommend using half the product’s weight of dry ice for overnight shipments (24 horas), equal weight for 48 horas, e 1.5 times the weight for 72 horas. Por exemplo, um 10 lb payload requires 15 lb of dry ice to stay frozen for up to 72 horas.
Detailed explanation: Dry ice sublimates at a rate of 5–10 lb per 10–15 lb of goods per 24 horas. Ambient temperature, insulation quality and starting temperature influence this rate. The table below provides a rule of thumb for different payloads and durations, :
| Carga útil | Dry Ice for <12 h | Dry Ice for 24–48 h | Dry Ice for 48–72 h | Practical meaning |
| 5 Libra | 3 Libra | 5 Libra | 10 Libra | Small packages need more ice for longer trips; doubling the weight extends frozen time. |
| 10 Libra | 5 Libra | 10 Libra | 15 Libra | Equal weight keeps items frozen for two days; adicionando 5 lb ensures 72 horas. |
| 20 Libra | 10 Libra | 20 Libra | 30 Libra | Larger payloads require proportional dry ice; 1.5× weight for 72 horas. |
| 40 Libra | 15 Libra (principal), 5 Libra (fundo) | 25 Libra (principal), 15 Libra (fundo) | 40 Libra (principal), 20 Libra (fundo) | Positioning more ice on top improves performance; bottom layer helps for heavy loads. |
Tips for accurate calculations
Test your packout: Conditions vary. Conduct a test shipment with temperature data loggers to verify that 1.5× weight maintains temperatures for the full 72 horas.
Factor in delays: UPS recommends adding enough dry ice for an extra 24 hours to cover possible transit delays.
Tamanho é importante: Use smaller, uniform dry ice pieces to slow sublimation and achieve consistent distribution.
Exemplo: Shipping a 20 lb box of frozen fish requires about 30 lb of dry ice for a 72 hour trip. Lugar 20 lb on top and 10 lb at the bottom for optimal cooling.
Which insulated packaging works best for a 72 hour dry ice pack?
Resposta direta: The best insulation for a 72 hour dry ice pack is a high performance box made of expanded polystyrene (EPS), polyurethane foam or vacuum insulated panels. Insulation slows heat transfer from the environment, Permitir que o gelo seco dure mais tempo. Thick foam or vacuum panels are recommended for shipments longer than 48 horas.
Detailed explanation: Insulated boxes come in several materials, each offering different thermal resistance (R value) e durabilidade. Here are common options:
| Material | Desempenho térmico (R value) | Typical Applications | Meaning to you |
| EPS foam coolers | Moderado (≈3.6 per in) | Food shipments, produtos farmacêuticos | Affordable and widely available; suitable for shipments up to 48 h. |
| Espuma de poliuretano | Alto (≈6–7 per in) | High value pharmaceuticals, Amostras de biotecnologia | Provides better insulation for 72 hour shipments but costs more. |
| Corrugated cardboard + foil liners | Variável | Kits de refeições, mantimentos | Lightweight and recyclable; use for short shipments or when weight matters. |
| Painéis isolados a vácuo (VIPs) | Very high (25–30 per in) | Specialty shipments (vacinas, Biologics) | Extremely efficient; extends 72 hour dry ice pack performance but expensive. |
Dicas e sugestões práticas
Choose thickness: Thicker insulation extends transit time. For shipments over 48 horas, use multi piece foam panels or vacuum insulated boxes.
Leave space for dry ice: The box should provide room for dry ice above the goods and cushioning around the sides.
Use forros reflexivos: Reflective materials reduce radiant heat gain and can enhance performance, especially in hot climates.
Real world tip: For a 72 hour dry ice pack, a 1.5 inch thick polyurethane box with a vacuum insulated panel insert can reduce ice consumption by up to 20 %, but costs more. If cost is a concern, an EPS foam box with a foil liner provides a good balance for 72 hour durations.
What safety and regulatory rules apply to 72 hour dry ice packs in 2025?
Resposta direta: Handling a 72 hour dry ice pack requires compliance with hazardous material regulations and proper safety gear. NÓS. regulamentos (49 Cfr) and IATA rules classify dry ice as a Class 9 materiais perigosos. Packages must display the UN 1845 rótulo, declare the net weight of dry ice and use ventilated containers. International shipments on passenger aircraft are limited to 2.5 kg (5.5 Libra) de gelo seco por pacote, while cargo flights allow up to 200 kg. Shippers must wear protective gloves, goggles and bibs to avoid frostbite.
Detailed explanation: Dry ice safety covers several areas:
Labeling and marking: Packages must carry the “UN 1845” designation and a Class 9 Etiqueta de perigo. The net weight of dry ice must be marked. This ensures compliance and alerts handlers to potential hazards.
Ventilação: Containers must allow CO₂ gas to escape. Airtight containers risk pressure buildup and rupture.
Limites de peso: Non medical shipments containing more than 5.5 Libra (2.5 kg) of dry ice in the U.S. must comply with 49 Regras CFR. The IATA restricts dry ice to 2.5 kg per package on passenger flights and up to 200 kg on cargo flights. UPS suggests adding extra dry ice for transit delays and provides high density EPS foam containers to reduce sublimation.
Handling equipment: Wear goggles, insulated gloves and protective clothing when handling dry ice. Avoid direct skin contact to prevent frostbite. Use tongs or scoops for transferring dry ice.
Armazenar: Store dry ice in a well ventilated area using non airtight containers. Never store dry ice in a completely sealed cooler or basement without ventilation.
Disposição: Allow leftover dry ice to sublimate in a safe, espaço ventilado. Never flush it down a sink or put it in a closed trash bin.
Exemplo prático: When shipping a 72 hour dry ice pack via air, you’ll need to weigh the dry ice and include that number on the hazardous materials declaration. Por um 15 lb payload requiring 22.5 lb de gelo seco, apenas 5.5 lb can be included in a single package on a passenger flight; the rest would need to be distributed or shipped on cargo aircraft.
Additional tips for safe handling
Combine dry ice with gel packs or PCMs for stability: Hybrid packouts can reduce dry ice usage while maintaining temperature.
Treine a equipe: Anyone involved in packing or handling must be trained in hazardous material regulations. Provide clear instructions for opening packages safely.
Use CO₂ sensors: Smart sensors can detect CO₂ buildup and alert handlers to vent the package if necessary.
How to combine dry ice with gel packs or PCMs for 72 hour shipping?
Resposta direta: Combining dry ice with gel packs or phase change materials (PCMs) can extend the duration of a 72 hour dry ice pack and reduce CO₂ emissions. Gel packs maintain temperatures near 2–8 °C and are ideal for chilled goods, while PCMs maintain specific temperature ranges (por exemplo, 0 °C, 5 °C, −20 °C). By pairing dry ice with PCMs, you create a hybrid packout that provides stable temperatures and reduces the amount of dry ice needed.
Detailed explanation: Hybrid cooling works by using dry ice to reach ultra low temperatures and PCMs to buffer temperature fluctuations. PCMs are substances that absorb or release heat as they change phase, mantendo uma temperatura constante. Por exemplo, a PCM with a melting point of −20 °C can keep goods at that temperature when dry ice starts to sublimate. Using PCMs also reduces the weight and hazard classification of shipments because less dry ice is required.
Tips for hybrid packouts
Select the right PCM temperature: Choose a PCM that matches your product’s required temperature range (por exemplo, 0 °C for chilled goods or −20 °C for frozen goods). This ensures effective buffering.
Use gel packs for last mile: Gel packs can be added for the last 12–24 hours of transit to maintain temperature once dry ice dissipates.
Balance weight and cost: PCMs and gel packs add weight; calculate the combined cost and shipping weight to ensure it’s economical.
Exemplo: A medical courier shipping vaccines uses 10 lb of dry ice and a −20 °C PCM panel. The PCM absorbs heat and limits temperature spikes, allowing the shipment to maintain −20 °C for 72 hours with only 10 lb of dry ice instead of 15 Libra. This reduces hazardous material paperwork and carbon emissions.
2025 trends and innovations for 72 hour dry ice packs
Visão geral da tendência
A indústria da cadeia fria está evoluindo rapidamente. Em 2025, sensores inteligentes, sustainable dry ice production and hybrid packaging are transforming how 72 hour dry ice packs are designed and used. Shipments are smarter, greener and more efficient than ever before.
Últimos desenvolvimentos de vista
Sustainable dry ice production: Suppliers are adopting greener manufacturing by capturing CO₂ from industrial processes like ammonia synthesis. Renewable energy sources are also being used to produce dry ice, lowering its carbon footprint.
Hybrid packaging and PCMs: Combining dry ice with PCMs or gel packs reduces CO₂ usage and shipping weight. This approach supports longer durations without increasing the hazard classification.
Smart packaging and tracking: New packaging features smart CO₂ sensors and QR coded labels that provide real time temperature and location data. Some systems integrate with blockchain, recording every step of the cold chain for traceability.
Automation and AI in logistics: Automated systems handle dry ice packaging to reduce human error. AI-driven tools predict weather impacts and optimize dry ice quantities, helping reduce waste.
Crescimento do mercado: The U.S. cold chain packaging market was valued at USD 7.97 bilhão em 2024 and is projected to grow at a compound annual growth rate (Cagr) de 15.6 % between 2025 e 2030. Demand for processed foods, online grocery shopping and strict pharmaceutical standards drive this growth. Pacotes frios (pacotes de gel, PCMs) are expected to grow at a CAGR of 17.6 %.
Insights de mercado
Consumers and regulators are pushing for greener, more reliable cold chain solutions. The shift towards eco friendly dry ice production and recyclable insulation materials reflects increasing sustainability concerns. Enquanto isso, the rise of meal kits and direct to consumer frozen foods means more businesses need accessible 72 hour dry ice pack options. Investing in smart sensors and hybrid packaging can reduce returns and spoilage, improving profitability.
Perguntas frequentes
Pergunta 1: How much dry ice do I need for a 72 hour shipment?
Usar 1.5 times the weight of your product. Por exemplo, um 10 lb payload requires about 15 lb de gelo seco. Add extra dry ice for delays.
Pergunta 2: Can I combine dry ice with gel packs?
Sim. Combining dry ice with gel packs or PCMs slows sublimation and extends cooling. Hybrid packouts are especially useful when products must not be exposed to extremely low temperatures.
Pergunta 3: Is it safe to ship dry ice internationally?
Dry ice can be shipped internationally but must comply with IATA rules. Passenger aircraft allow only 2.5 kg (5.5 Libra) por pacote, while cargo flights allow up to 200 kg.
Pergunta 4: What insulation should I use for 72 hour shipping?
Use high performance insulation such as polyurethane foam or vacuum insulated panels for shipments over 48 horas.
Pergunta 5: Como faço para descartar restos de gelo seco?
Let dry ice sublimate in a well ventilated area. Do not place it in a sink or sealed container.
Pergunta 6: What safety gear do I need?
Use luvas isoladas, goggles and protective clothing when handling dry ice. Avoid skin contact and keep dry ice away from children and pets.
Pergunta 7: Does dry ice leave moisture?
Não. Dry ice sublimates directly into carbon dioxide gas, não deixando água líquida. This prevents packaging damage and makes clean up easier.
Pergunta 8: How long does dry ice last?
Dry ice can maintain cold for 24–72 hours depending on the quantity and insulation. For 72 hour shipments, usar 1.5 times the product’s weight in dry ice.
Pergunta 9: Posso reutilizar pacotes de gelo seco?
Não. Dry ice sublimates and cannot be reused. No entanto, insulated containers and PCM panels can often be reused with new dry ice.
Pergunta 10: What is the difference between dry ice and gel packs?
Dry ice keeps goods below freezing for days, while gel packs maintain chilled temperatures above 0 °C. Gel packs are not classified as hazardous and are easier to handle but cannot keep products frozen.
Resumo e recomendações
O 72 hour dry ice pack is an effective way to ship frozen goods across long distances. Remember these key points:
Understand dry ice: Solid CO₂ sublimates at −78.5 °C and keeps goods frozen without moisture.
Calculate correctly: Usar 1.5 times the product’s weight in dry ice for 72 horas. Conduct test shipments and add extra dry ice for delays.
Choose the right insulation: High performance boxes made from EPS, polyurethane foam or vacuum insulated panels extend the life of your 72 hour dry ice pack.
Follow safety rules: Rotular pacotes com a ONU 1845, vent containers and wear protective gear, .
Embrace innovation: Pacotes híbridos, smart sensors and sustainable dry ice production reduce costs and environmental impact, .
Actionable guidance
To implement a successful 72 hour dry ice pack shipment:
Assess your product’s needs: Determine whether your goods must remain frozen or simply chilled.
Selecione isolamento: Choose an insulated box with appropriate material and thickness for 72 horas. Polyurethane or vacuum insulated panels are ideal for long trips.
Calculate dry ice: Use the 1.5× rule and add a buffer for delays. Place the ice on top and, for heavy loads, add some at the bottom.
Prepare packaging: Pre condition the box and dry ice. Wrap products in leak proof bags and use cushioning. Garanta ventilação.
Label and ship: Marque o pacote com a ONU 1845, declare the dry ice weight and follow IATA/49 CFR limits.
Monitor in transit: Use temperature sensors and data loggers to track the shipment. For cross country trips, use carriers with reliable transit times and route optimization.
Sobre Tempk
Tempk is a trusted provider of cold chain packaging solutions, offering insulated boxes, gel ice packs and 72 hour dry ice pack systems for food, pharmaceutical and biotech industries. We operate a CNAS certified lab and R&D center to ensure product quality and innovation. Our eco friendly cold chain products are reusable and recyclable, and our packaging solutions are certified through international standards and Sedex compliance. We specialize in customized insulation products, from gel packs to vacuum insulated boxes, tailored to meet the temperature and duration requirements of your shipments. Com tempk, you benefit from scientific expertise and reliable delivery—a partner committed to keeping your goods safe during transit.
Chamado à ação
Ready to ship with confidence? Contact the Tempk team today for a free consultation and customized 72 hour dry ice pack solução. We’ll help you choose the right insulation, calculate dry ice and implement cutting edge technology to protect your products. Whether you’re shipping frozen food, pharmaceuticals or research specimens, Tempk has the tools and expertise to ensure safe, sustainable delivery.
