Cryophase Packing Tips & Recommendations


Cryophase Phase Change gel bricks are ideal refrigerants to protect the payloads even if they are very sensitive to temperature variations during transport. There are several factors that affect the temperature of the Payload namely Thermal properties of the Cold Chain Shipper , Ambient temperature , Humidity , Air pressure etc .Inside the Cold chain shipper the most important factor that has as effect on the payload is the type of Cryophase Refrigerant ,Thermal mass ,temperature of Payload and more importantly stability of the Cryophase PCM gel Brick .


Hence its important the Cryophase bricks are conditioned appropriately for optimum performance. The Cryophase bricks are designed and formulated such that they can maintain temperature for extended periods.  The Plastic capsules are made from materials which are highly conductive and can absorb heat and release cold energy into the Shipper. The Cryophase gel packs have phase change matter encapsulated with flexible plastic barrier films whilst the Cryophase Bricks are packed in hard plastic capsules .


Cryophase Bricks are formulated to the below configurations with research being done to find more stable combinations for increased performance.

Cryophase Offer the following range of sub zero phase change material bricks Cryophase -5C Phase Change Gel brick , Cryophase -10C Phase Change Gel brick , Cryophase -12C Phase Change Gel brick , Cryophase -15C Phase Change Gel brick, Cryophase -20C Phase Change Gel brick, Cryophase -25C Phase Change Gel brick, Cryophase -30C Phase Change Gel bricks .

 PCM Brick

Best Freezer  Preparation Tips for Freezing gel packs- Its important that the freezers are set at the optimum temperature to ensure the icepacks / Gel bricks / Phase change gel bricks are conditioned / Frozen to the lowest temperature. Most domestic freezers have a freezing point of -21c at the plate . To ensure the Gel packs are frozen efficiently and to the coldest temperature , Its best if the freezer has been defrosted and any ice / frost formed on the plates and the walls of the freezer be removed.  Chest Freezers tend to have better freezing capacity compared to the Vertical freezers.  Well maintained freezers have good rubber seals and frequent formation of frost indicate the need for replacement rubber seals on the door. If the freezer has the condenser coils at the back of the Freezer, we recommend that there be a minimum of 3inch Gap. To Freeze large volumes of Gel packs, We suggest that the ventilated freezer Plates be spaced out and have sufficient gap between any two plates to allow for maximum airflow around the gel bricks will allow for maximum contact with the Cold Air inside the Freezer and ensure that all gel packs are uniformly frozen and reduce possibility of any distortion .


To Ensure the Cryophase Phase change Bricks reach the right core temperature, it is important that they be frozen / conditioned in the Right Freezer.


Below are the recommendations for  choosing the right Freezer


Cryophase Brick Range

Minimum Freezer Requirement

Cryophase Range -5C  to -15C

-21C Freezer

Cryophase Range -18C to -21C

-25C Freezer

Cryophase Range -25C to -35C

-45C Freezer


Chest Freezers are recommended for best results


How to freeze Cryophase Phase Change Material Icepacks / PCM Gel bricks – The Gel bricks are usually made from a Hard capsule and easy to Stack in a Freezer . The Gel Packs are usually flexible and its important that the icepacks are stacked well to ensure they are not deformed when frozen making it hard to pack the shipper. Its best to ensure the Cryophase bricks/ gel packs are room temperature and not too warm when they are ready to be loaded in the freezer .The Higher the volume of icepacks that are being loaded in a Freezer , the longer it will take for the core temperature of the icepacks to drop to the freezer temperature. If there is sufficient freezer space Its best they are frozen for a few Days in batches and you have new batches being loaded whilst previously loaded well frozen gel bricks can be used .


How to Condition Cryophase Phase Change Gel bricks / Gel packs

The Refrigerant bricks or gel bricks require to be frozen to the right start temperature depending on the temperature sensitivity of the payload and the cold chain requirement. Hence in instances where the Cryophase bricks are required to have a colder temperature than the freezer , Its best they are conditioned with a freezing agent like Dry ice to bring the core temperature right down . However in instances where the Cryophase Gel bricks are required to start at a slightly warmer temperature. For example - if the Cold chain solution requires the Brick to start at -12 Degree C and it has just come out of a -18 Freezer, Its recommended that the Cryophase Phase change gel bricks be removed from the fridge and conditioned in Ambient temperature on a table and the temperature monitored with a laser Temperature gun regularly until the Gel brick reaches -12 Degrees before being packed into the Cold chain Shipper . Conditioning these Gel packs is very important in situations where the payload is temperature sensitive .


How to pack a Cold Chain Shipper

The Best Cold Chain Shippers  are usually designed and constructed after they are carefully reverse engineered  based on critical time and temperature calculations after carefully understanding the cold chain requirement. However a lot of people tend to lean towards a cost effective approach which is pack a Polystyrene esky / cooler with Cryophase bricks / Cryolux gel packs  / Cryolux dry icepacks .  Below are some of the Tips to get the most out of your Cryolux Esky and Gel bricks.


Choice of Shipper size and quality

It is important that you choose the right size esky / Shipper to ship or transport things frozen or chilled . There must be sufficient room for enough refrigerants to keep the payload Cold / Frozen. In many instances the cold chain project fails simply due to a miscalculation in the volume of refrigerants that is packed to keep the Payload at the right temperature. Especially when it is a Polystyrene Esky / shipper, We recommend you to be cautious and pack sufficient Icepacks simply because of the poor thermal properties of Polystyrene.

Cold chain shipper

It is recommended that you have a layer of Cryophase bricks on the floor of the icebox and along the walls so the payload can be packed in the middle. We recommend there be 2 to 3 Layers of the Frozen Cryophase bricks to ensure there is sufficient cooling all around the box keeping mind cold energy flows from top to bottom .

The Shipper must be packed immediately after the Cryophase bricks are taken out of the freezer / Fridge without exposing the products to ambient temperature for too long.

To ensure the Cold air is locked inside the cold shipper , Its best to ensure that the lid fits well on the esky / shipper and is sealed airtight . We recommend using a Masking tape or an insulation tape to seal the lid against the wall. The shipper then be packed in a carton and the carton be stored in the cold room or a cooler area before they are shipped.

If the Shipper is being transported in a Freezer van , we recommend it to be away from the Doors if they are frequently opened .

Cryolux offer a full range of Gel packs , Flexible Ice wraps , Cryophase Phase Change Material Gel bricks and are currently developing a wide range of shippers and innovative cold chain solutions


Please feel free to email us at if you have any queries or require any assistance to improve your cold chain.