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For the demineralization of water in the production of ultra pure water (UPW) (> 18 MOhm*cm at 25°C)
Lewatit® UltraPure 1292 MD is a ready-to-use mixed bed comprising a gel type strongly acidic cation exchange resin (SAC) and a gel type, strongly basic anion exchange resin (SBA, type I), individually with a monodispersed bead size distribution (uniform particles) based an a styrene-divinylbenzene copolymer for the use in working/regenerable and polishing/non-regenerable systems for the production of ultra pure water.
The monodisperse beads (uniformity coefficient: max. 1.1) are chemically and osmotically highly stable. The optimized kinetics lead to an increased operating capacity, and the very low content of fines also results in a low pressure drop compared to ion exchange resins with heterodisperse bead size distribution.
Lewatit® UltraPure 1292 MD is correspondingly adjusted to the total capacity of the individual components to an equivalent ratio of 1:1. In the regeneration step of a regenerable mixed bed, cation and anion exchange resins are clearly separated for providing a better quality of the service water.
Lewatit® UltraPure 1292 MD is highly regenerated and specially cleaned for meeting the specifications of the semiconductor industry. Leaching of organics from Lewatit® UltraPure 1292 MD into the treated water is reduced to a level less than 10 ppb, and its resistivity achieves a level higher than 18 MΩ.cm.
