IROGRAN® A 78 E 4506

Irogran® A 75 E 5040 is supplied pre-dried, however to ensure trouble-free processing it is preferable to dry before use. The recommended drying conditions are:

• 3 hours at 80-90°C in circulating air
• 3 hours at 70-80°C in dehumidified air
• Dew point: -30°C

Drying

• To ensure optimal processing performance, materials must be dried before processing. Water content of the granulate should not exceed 0.02 wt.%.
• Desiccant air dryers, circulating air dryers and vacuum drying ovens can be used to reduce the moisture content of the granulates before processing.
• Drying recommendations depend on the hardness of the resin, chemical structure and drying process. For TPUs with a Shore A above 90, a higher drying temperature is typically required. For drying conditions for specific TPU grades, please refer to the respective technical datasheet.

Coloring and additives

• Our TPU elastomers can be opaque or transparent, depending on their processing route and microstructure. They can be colored using a masterbatch with typical amounts ranging from 1 to 4 wt.%, depending on the thickness of the final product and the pigment concentration in the masterbatch.
• Using an incompatible masterbatch may cause poor pigment dispersion as well as a poor surface finish with surface defects.
• Different types of additives (UV stabilizers, anti-blocking agents, release aids, etc.) can be added to our TPU grades to enhance material properties.
• It is important to ensure that color or additive masterbatches do not contain any moisture. For that reason, masterbatches used during the processing of our TPU grades should be pre-dried appropriately.

• Our TPU grades should be stored in cool and dry conditions, if possible at room temperature.
• TPUs are hydroscopic, meaning that dry pellets can absorb up to 1,5 wt. % of moisture relatively quickly if packaging is left open. After use, seal any packaging promptly to protect any remaining material.
• Keep material dry during processing by covering the feed hopper whenever possible.
• Irogran® A 78 E 4506 has a minimum expected shelf life of 12 months after shipment date. The product should be stored in a dry and cool place in the manufacturer ́s original packaging.