Macroencapsulation - Cooling accumulators

Macroencapsulation - Cooling accumulators

customized transport solutions

Storage accumulators that are made out of plastic and filled with PCMs (phase change materials, latent storage media) are applied in the cooling logistics. They enable a passive tempering in transport boxes.

Rubitherm uses its fully automatic plant for the filling-in and sealing of heat storage accumulators which are ordered by the customer. For small batch series, they can be filled in and sealed manually. In both cases, either we use accumulators that have been prepared by our customers or we develop individual shapes and sizes together with our customer.

Basic goal of cooling accumulators that are filled with PCM is the temperature stabilization at a certain level. Depending on the used PCM, the temperature can be chosen for any case.

Amongst others, the use of the RT5 material is the prior art. It is applied for temperature stabilization in the range of +2 up to +8°C (36 to 46°F) which plays a major role in the logistics for pharmaceuticals.

The RT5 possesses a defined melting range which can be used in order to avoid both, overheating and subcooling. For desired temperature stabilization, simply a defined tempering of the accumulators is necessary prior to application. This tempering can be seen as a kind of pre-conditioning, in which the PCM is partially in the liquid and partially in the solid state. The solid and liquid parts of this (partially) molten PCM are capable of absorbing heat and cold and thus postpone overheating and circumvent subcooling, respectively.

There are additionall candidates for the temperature range +2 to 8°C like RT5HC and SP5, a direct comparison are available here.

Thanks to the variety of different melting ranges of our Rubitherm products also other temperature ranges can be stabilized.

An alternative to the rigid cooling accumulators also different solutions for pouches can be offered.

PCM macroencapsulation, cool packs, bagsPCM macroencapsulation: soaked foam covered with foil, filled polymer bags with transparent or aluminium compound foil (f.l.t.r.)

There are also standard cool packs available. They are available for sample production with individual PCM filling:


PCM macroencapsulation: cool pack R1 (240ml): filling quantity approx. 200 g RT or up to 380 g SP; cool pack R2 (500ml): filling quantity approx. 410 g RT or up to 800 g SP (f.l.t.r.)

product melting area heat storage capacity Ø technical data sheet
RT 5 5°C 180 kJ/kg PDF
SP 5 4 <> 6°C 170 kJ/kg PDF
RT 5 HC 5°C 250 kJ/kg PDF