Electronics - Plating

Lewatit® ion exchange resins for the electro electronic industry and plating


Ultra pure water (UPW) is indispensable in the field of microelectronics, e.g. for the precision manufacturing of semiconductor components, such as processors, memory chips, light-emitting diodes (LED), liquid crystal displays (LCD) and solar modules. Special ion exchange resins from the Lewatit® UltraPure range play a significant role in producing ultra pure water reliably and efficiently. They display a very low release of organic matter (low ΔTOC, total organic carbon) during operation. To produce UPW, untreated water or recycled process water is first demineralized and then taken through a series of purification steps to finally reach the specified, extremely low levels of conductivity.

Pretreatment (full demineralization) often includes reverse osmosis, for which LANXESS markets membrane elements under the brand Lewabrane®.

One special application in the electronics sector is the removal of hydrogen peroxide with Lewatit® K7333, which is an oxidizing agent as the result of the manufacturing process, and which would otherwise cause difficulties during its use. Ion exchange resins are also part of waste water treatment in the semiconductor industry, for instance in the elimination of fluoride ions.

The electroplating industry presents very different challenges. Ion exchange resins eliminate unwanted ions from spent, aqueous electroplating baths and therefore significantly extend their service life. Ion exchange resins further help in the disposal of spent plating baths by removing from the wastewater any toxic and environmentally harmful heavy metal ions, such as chromium, cobalt and nickel, as well as chelating agents, such as cyanide and thiocyanate. Raw materials, including precious and platinum metals, can be recovered from the plating baths very efficiently.