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Cool Cube™ 28 at Fridge Temps

For RCBs, Tissue & Other 1-6°C/1-10°C Products

A laboratory validated cooler that utilizes PCM technology to keep product such as blood products, tissues, and organs 1-6°C for 68+ hours without the need for electricity, ice or buffering material. Ideal for extended RCB storage (or transportation), field-ops and power outage backup.


Available on backorder

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Frozen Temps PCM System for Cool Cube™ 28 (6 Panels)

A set of six panels containing phase change material (PCM) that is nontoxic & biodegradable. These panels for the Cool Cube™ 28 provide advanced thermal protection for frozen product due to a -21.5°C/-6.7°F melting point (temperature hold).

Available on backorder

Memory-Loc™ Temperature Monitoring & Data Logger Kit

A data logging thermometer that locks over 1 million temperature observations (good for 21 CFR 11 environments). This calibrated logger has user-defined time intervals, downloads data to any USB stick, and meets current CDC requirements.

Available on backorder

The Cool Cube™ 28 at Fridge Temperatures (BT-28) is not an ordinary blood products transport cooler. It is a lockable, wheeled, qualified container and pack-out system that keeps temperature sensitive product (various blood products) chilled between 1° and 10°C for over 4.5 days, or between 1° and 6°C for over 2 days– without using ice or electricity! This cooler is ideal for transport, but also excels at protecting valuable product during off-site use and power outages, regardless of hot or freezing conditions. The simplified, validated, patented technology is the best compact thermal protection product available to maintain the cold chain!

Technology & Features

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Phase Change Technology

Cool Cube™ PCM (phase change material) is engineered to maintain a constant temperature at a specific melt/freeze point. PCM empowers the user with a safe, effective means to maintain the temperature of valuable product.

Temp-Shield™ Insulation

Vacuum insulated panels (VIPs) offer advanced thermal protection far superior to other types of insulation. The temperature-holding qualities ensures the user a long-lasting, consistent temperature hold for days.

Transport Case

Each outer case is built with mobility in mind. Various features enable the user to move with confidence and know the contents are well protected (and at the correct temperature) during transit and use.

Additional Features

PCM Panels

VIP System

  • Six panels for refrigerated temperatures included.
  • Patented, beveled-edge design seamlessly fit together.
  • Panels are interchangeable with other temperature systems.
  • Reusable (10,000+ cycles)
  • Reinforced, clear-plastic, protective wrap.
  • Rigid structure is durable and light.
  • 5x the resistance (R-value) of conventional insulation.
  • Removable and replaceable.

Dimensions & Specs

Outside:  20½” x 20½” x 23″
Inside:  12″ x 12″ x 12″
Weight: 61 lbs.

Cool Cube™ 28 scaled with people-200x200

Easy & Safe Pack-Out

Step 1 Remove PCM from Cool Cube™
Step 2 Prep PCM Panels
Step 3: Assemble Cool Cube™
Step 4: Pack-Out Cool Cube™
Step 5: Close Cool Cube™


No worries for several days! This validated system will hold 1-10°C (34°-50°F) or 1-6°C (34°-50°F) for an extended time, even in harsh environments. It is long-lasting, passive temperature-controlling technology when you need it most.

extended transport a
off-site initiatives


Ideal for outreach clinics and field missions! This easy-to-use system eliminates the complicated steps found with other methods, and simplifies/expedites the pack-out process. Packed with mobility features, it can go anywhere it’s needed.


A great solution to keep things safe during power outages! Since it does not rely on ice or electricity, next time the refrigerator goes down have this storage AND transport solution as a backup. Reduce the risk with a Cool Cube™.

emergency backup blood

All - Series 4 Prep Methods

Series 4 - Prep Method A - Freezer-Fridge Prep to keep product cold

Series 4 Prep Method A: Freezer to Fridge Pack-Out Instructions

1. Place panels in a freezer so PCM (phase change material sealed inside the panel) is solid. Shake to verify.

        • i.e. 2 hrs. @ -15°C turns PCM solid

2. Transfer panels into a fridge for a minimum of 3 hours before use to allow PCM inside to rise to the appropriate operating temperature. Panels may be stored in the fridge until needed for assembly or the PCM melts.

Shake PCM Panel To Check

If a refrigerator maintains 4°C or below, the PCM within the panels will not melt (melting point is 4.5°C), keeping the PCM solid indefinitely until pack-out. If the refrigerator maintains 5°C or above, periodically check for melting and restart prep to ensure best performance.

Before assembly, shake panels to verify PCM is solid. If liquid can be heard, panels may be used but hold times will decrease.

Series 4 - Prep Method B - Fridge ONLY Prep to keep product cold

Series 4 Prep Method B: Fridge Only Pack-Out Instructions

1. Store panels in a refrigerator for a minimum of 24 hours before use.
Shake to check the state of PCM (phase change material inside the panel).

Shake PCM Panel To Check

        • If liquid…panel is at the fridge temp but above 5°C; anticipate shorter hold times.

        • If solid…panel is at the fridge temp but below 4°C; ideal for maximum hold times.

        • If solid/liquid combination…panel is at the fridge temp of 4-5°C; monitor time/temp.

In a refrigerator that maintains 4°C or below, PCM will be solid (ideal for keeping product cold in warm/hot conditions). In a refrigerator that maintains 5°C or above, PCM will be liquid. Although panels are liquid, the PCM inside is at the temperature of storage environment after 3 hours (i.e. stored in a 6°C fridge, the PCM panels are at 6°C). Assembling the Cool Cube™ with liquid panels (additional thermal mass) will help keep product at their temperature, just for a shorter amount of time. Monitor Cool Cube™ temperature closely.

Series 4 - Prep Method C - Freezer-Room Prep to keep product cold

Series 4 Prep Method C: Freezer to Room Pack-Out Instructions

1. Store panels in a freezer
so PCM (phase change material sealed inside the panel) is solid. Shake to verify.

Shake PCM Panel To Check

        • i.e. 2 hrs. @ -15°C turns PCM solid

2. Transfer panels into a room temperature environment just prior to use (recommended time below) to allow PCM inside to rise to the appropriate operating temperature.

Recommended times based on a 22°C room temperature (by panel size):

PCM Panel Staging Time Reference Chart

PCM panels coming out of a freezer into a room temperature environment may develop frost and/or condensate on the outside. After the frost turns to condensate, it is above 0°C. As soon as any liquid is heard inside the panel, it is at or above 4.5°C.

Series 4 - Prep Method D - Fridge Prep to prevent freezing

Series 4 Prep Method D: Fridge Only Pack-Out Instructions (to prevent freezing)

1. Place panels in a fridge between 5° and 8°C
or at least 24 hours before use so PCM (phase change material sealed inside the panel) is liquid. Shake to verify.

Shake PCM Panel To Check

Panels may be stored in the fridge until needed for assembly or the PCM solidifies. If a refrigerator maintains 5°C or above, the PCM within the panels will not get solid (solidifying point is 4.5°C), keeping the PCM liquid indefinitely until pack-out. Liquid panels will protect the product from freezing until the PCM inside becomes completely solid.

Before assembly, shake panels to estimate the state of the PCM. Liquid PCM panels will prevent product from freezing (at refrigerator temps) in extreme cold the longest. Slushy or solid PCM panels may be used but hold times will decrease.

Thermal Properties of Series 4 PCM Panels

Phase change materials (PCMs) are materials that absorb and release thermal energy during the process of melting and freezing. When a PCM melts, it absorbs the heat from the environment, yet its temperature stays at the melting point until totally liquid. Conversely, when a PCM freezes, it absorbs the cold from the environment, yet stays at its temperature until totally solid. This makes PCM an ideal, passive solution for a variety of applications that require temperature control. The most common PCM is water/ice. Ice is an excellent PCM for maintaining temperatures at 0°C. But water’s freezing point is fixed at 0°C (32°F), which makes it unsuitable for most temperature sensitive applications.

Cool Cube™ PCMs offer custom temperature holds based on their melting point. The PCM inside Series 4 panels has a melting point of 4.5°C/40.1°F. When panels are solid, contents within the Cool Cube™ stay cool (at fridge temps around 4.5°C) in hot conditions during an extended period of time. When panels have liquid inside, contents within the Cool Cube™ won’t freeze (again at fridge temps around 4.5°C) in extreme cold during an extended period of time.

When the panels have reached 4.5°C and are completely solid, they are ready to hold your product. To verify that they are solid simply shake the panel. If you shake the panel and it feels and sounds slushy, with some liquid and some solid it will hold your product at a cool temperature, but it won’t hold it as long as if the panel is completely solid. If you shake the panel and it feels and sounds completely liquid, put the panel back into the freezer/refrigerator and continue to condition until the panel has reached a solid state.

Shake a panel at various times to get to know your panels. For example, shake the panels when you know they are warm to hear and feel how they react when they are liquid.

Within this webpage are several methods for conditioning your PCM panels. The standard conditioning method is performed in the refrigerator. The advantage of the refrigerator is that your panels won’t get too cold. This method can take from 8-24 hours. Alternatively, if you need to use your panels sooner than 8-24 hours, they can be conditioned in a freezer.

PCM panels can be frozen too cold, but there is an easy solution when this occurs. When the panels are frozen to a point below 0°C/32°F, a short staging period is necessary to safely transport your product. If your panels have been stored in the freezer simply take the panels out of the freezer and lay them, individually (unstacked), on a flat surface at room temperature for roughly 30 minutes.

Hold times of the PCM panels vary depending on Cool Cube™ size and desired holding temperature. For example, when properly packed-out into the Cool Cube™ 08, the Series 4 PCM panels can hold the cooler at a temperature below 8°C and above 2°C for 76 hours.

With all pack-out procedures, be sure to use a temperature monitoring device to consistently and accurately monitor the temperature your payload for the entire time it is held in the Cool Cube™. Some regulatory bodies such as the CDC require the use of a certified data logger. VeriCor carries several types of thermometers and digital data loggers that meet the CDC recommended guidelines.

Series 4 PCM - ISTA 7D Thermal Performance Study Temperature Hold Times

Cool Cube™ User Guide

Cool Cube™ User Guide
Cool Cube™ User Guide
Version: 02

Cool Cube™ Series 4 Panel Sizes and Specs


Refrigerated Temps Hold Time


PCM Panel Prep Steps Sequence

  • Always prep the PCM panels before use according to one of the described methods provided by VeriCor.

  • Ensure all components are clean and free of damage.

  • During prep, enable ample air flow around all panel sides (use spacers or racks).

    PCM Panel Spacing Customer Solution

  • Lay panels flat when “freezing”.

  • Freeze/melting times vary depending on number of panels being prepped and equipment specifications being used. Assemble using all six panels for maximum hold time.

  • Using less panels does not change the holding temperature but does decrease hold time.

  • Panels are reusable (10,000+ cycles). (End-of-life disposal: panels use a plastic #2, typically recycled by businesses/communities; PCM is nontoxic and readily biodegradable.)

  • Use a calibrated data logger or other temperature monitoring device to observe internal temperature.

  • Avoid unnecessary opening of the Cool Cube™ after loading payload. Opening of the Cool Cube™ will decrease hold time.

  • An infrared temperature thermometer can assist in ensuring the panels reach a safe pack-out temperature (good for finding out the approximate temperature of each panel).

  • Further the temps are away from the melting point, the quicker PCM will change states.



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BT-28 Specific FAQ

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Blood Products Specific Cool Cubes™

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General Cool Cube™


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Pack Out

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