Desmopan® and Texin™ are supplied as natural colored cylindrical or lentil-shaped granules. Depending on the particular grade, the color ranges from transparent/clear and whitish opaque to white. The product can be supplied in quantities of between 25 kg and 1,000 kg, depending on the grade. For sampling purposes 25 - kg sacks or steel drums with a content of 30 kg can be supplied.
Desmopan® and Texin™ should be stored in cool, dry conditions. Temperatures above 40 °C should be avoided. Optimum processing is ensured within approx. 6 months after delivery.
TPU absorbs moisture from the air. The extent and rate at which this happens depends on the raw material type, hardness and climate ( Fig. 1).
To ensure trouble-free processing and avoid any
loss of quality, we recommend drying to a moisture content of ≤
Depending on the hardness, the recommended drying temperatures are between 80 and 110 °C, with drying times of 1 to 3 hours. Better drying can be achieved in a shorter time with dry-air dryers (Fig. 3).
Dried, hot granules should not be left to cool down in the open air. They must be stored in dry containers that can be re-sealed. The machine hopper must be kept covered over. Transportation of granules from the dryer to the processing machines is only allowed by means of redried pressurized air.
Additional detailed information for the general drying procedure, possible drying devices, the measuring procedures for residual moisture regulation and an error catalog are available in the following technical information:
TPU products attain their optimum physical
property llevel only after they have spent some time at room
temperature. This process can be speeded up by an annealing
process in a circulating air heating oven, reducing it to 15 - 20
Desmopan® and Texin™ are supplied in their
natural color and can easily be pigmented, most commonly using
color granules (masterbatches), but also using coloring pastes,
liquid colors or pure pigments.
Color masterbatches provide the simplest, cleanest and most reliable means of coloring Desmopan® and Texin™, particularly when Desmopan® and Texin™ are also the carrier materials. SAN-resin-based color granules are also suitable to a limited extent. Color granules based on polyolefins and PVC are not suitable. Suppliers normally recommend employing metering quantities of between 1.0 and 4.0 % depending on the wall thickness of the articles and the color density of the pigments.
Color pastes, liquid colors and pigments
It is less common to use color pastes, liquid
colors and pigments to color Desmopan® and
The Fantasia technologies from
Bayer MaterialScience open up completely new design possibilities
for coloring and finishing plastic parts. Aura technology is
particularly suitable for Desmopan® and Texin™ – despite certain
limitations in terms of pigment migration.
To improve the processing characteristics or
specific properties, we recommend the addition of conventional
functional concentrates such as:
Desmopan® and Texin™ can be machined and
processed over a wide temperature range but, as with all natural
and synthetic organic materials, they decompose above a certain
temperature. Smoke generation signifies that decomposition is
taking place. Slow decomposition commences at approximately 240
°C, depending on the grade of Desmopan® involved. Further
information is given in our Safety Data Sheets.
Provided that they are not contaminated with
other substances, Desmopan® and Texin™ can essentially be disposed
of in municipal landfill sites.