Desmopan TPU 600 Series

Drying and Storing Guidelines for Optimal Material Performance

Like all thermoplastic polyurethanes, Desmopan resins absorb moisture from the air.  The extent and rate at which this happens depends on the raw material type, shore hardness and climate. 

To ensure trouble-free processing and to avoid any loss of quality, Bayer MaterialScience recommends drying the Desmopan TPU resins to a moisture content of 0.05% or less.

Why Dry?

If the TPU resin granules are too moist, blisters or streaks can occur on the surface of the finished components - the material is no longer smooth and glossy, but foamy and gassy. 

Another frequent cause of defects is the use of undried functional concentrates.  These batches should be separately predried to a moisture content of 0.05% or less through conventional dry air and circulating air dryers.

Drying Temperature

Depending on the shore hardness of the resin, the recommended drying temperatures are between 80 and 100 degrees C (176 to 230 degrees F), with drying times from one to four hours.  Drying can be achieved in a shorter time with dehumidifying dryers.

Proper Storage

Dried, hot granules should not be left exposed to open air.  They must be stored in dry containers that can be resealed.  The machine hopper must be kept covered.

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