Molecular sieves are synthetically produced zeolites with a regular crystalline structure – and thus a uniform pore diameter. Small molecules get trapped in the pores and are held there; large molecules flow past outside. One needs molecular sieves with a pore width of 4 Å in order to retain water.
Molecular sieves are used for particularly rapid flash drying or to maintain objects (products and goods) with an air humidity of almost 0% RH. Unlike bentonite and silica gel, however, they take up 16 - 22 per cent of their weight in water vapour regardless of the particular relative humidity.
Regeneration of molecular sieves is possible repeatedly at 250 - 350°C. Whereby it is necessary to ensure slow heating – otherwise the molecular sieve ages too quickly or is completely destroyed.
We supply molecular sieves in every pack size, according to customer requirements:
ORANGE® dry pearls are the only desiccant with a humidity indicator free of heavy metals. This desiccant replaces blue gel. ORANGE® dry pearls permit a reliable monitoring of the drying process. Thanks to an indicator, the dry pearls change colour from orange to colourless when they have taken up about 6% of water by weight. Water, however, is still adsorbed after this point has been reached. The total adsorption capacity is not affected by the colour indicator. ORANGE® dry pearls can be regenerated from 130°C - 160°C. There is then a colour change back from colourless to orange and the product is fully functional again.
We supply ORANGE® dry pearls in every pack size, according to customer requirements: