Toluenediamine (TDA) as preliminary product and diaminotoluene (MDI), as well as toluene diisocyanate (TDI) as intermediate produce play an important role in the production of polyurethane. TDA is produced by the reaction of dinitrotoluene (DNT) and the use of nickel-raney as a catalyst; both fluids require an absolute process safe and precise metering.

Reliable conveying with LEWA pumps from preliminary and intermediate products during polyurethane production have made LEWA known as a partner for safety and reliability in this sector.


Advantages of LEWA process diaphragm pumps


Hermetically tight (important for isocyanates)

High working pressures are possible

Suspension capability (nickel-raney catalyst)

Safe in continuous operation

Very high availability and reliability (optimized for continuous operation)

Low life cycle costs



Areas of application

Polyurethanes (PUR) belong to the most important polymers.

The technical area of application of PUR goes from "PUR soles" to "PUR foam". The main area of application of polyurethane is the use of foam, e.g., for upholstered furniture, mattresses, sponges, winter clothing, coating for carpets, constructional foam for thermal insulation, packing material, etc.

They are also used as paint and adhesives, as thermoplastic plastics for the production of rollers, rolls, and as elastomers and fibers, e.g. as elastane.




LEWA supplies you with individual chemical pumps and customized system solutions for various areas of application in the chemical industry.


Plastics processing

LEWA supports you in plastics processing with custom-built plants and systems.


Metrans Makina is the only authorized Lewa distributor and service provider in Turkey.





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