Texin, Desmopan, Durethan, Nylene, Grivory, Grilamid
TPUTPUTPUTPUTPUTPUTPUTPUTPUTPUTPU
TPU
TPUTPUTPUTPUTPUTPUTPUTPUTPUTPUTPU
TPU
Texin, Desmopan, Durethan, Nylene, Grivory, Grilamid
thermoplastic polyurethane, TPU, nylon, pre-colored compounds color compounding, polycarbonate, polycarbonate blends

Makrolon, Bayblend, Makroblend, Lustran
color compounding, polycarbonate, polycarbonate blends
LTL Color Compounders

What are the advantages of TPU?  
Are there any processing issues to
be aware of when using TPU
?
 
How does the "Shore-A" hardness scale
relate to the "Shore-D" hardness scale
?
  
What type of mold surface is
recommended for processing TPU?
 

What are the advantages of TPU?
The advantages of TPU compared to other materials are:


Versus Metal

Versus Plastic

Versus Rubber
Lighter Weight
Non-Brittle

Abrasion
Resistance
Less Noise
Elastic
Properties
Cut and Tear
Resistance
Better Wear
Abrasion
Resistance
High Load
Bearing
Cheaper
Fabrication
Hydrolytic
Stability
Clarity and
Color Availability
Corrosion
Resistance
Chemical
Resistance
High Ozone
Resistance
Shock
Absorption
Impact
Resistance
Harder Durometer
Ranges
Dent
Resistance
Cold Temperature
Flexibility
Hydrolytic
Stability
Recyclable

 
Recyclable

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Are there any processing issues to be aware of when using TPU?
Like many materials, TPU can be affected by too much moisture. TPUs are hygroscopic materials, which absorb moisture rapidly. The following drying procedures should be taken into consideration when drying this material:

Use a desiccant dehumidifying hopper dryer.  
Hopper dryer capacity should be sufficient to ensure that the resin remains in the hopper at least 2 hours prior to being processed.  
Hopper inlet air temperature of 180F to 230F (82C to 110C). For softer materials, use lower temperatures in this range. Temperatures in excess of 230F (110C) may cause the pellets to stick together in the hopper.   
Airflow to the hopper of 1.0 cubic foot per minute (CFM) for every pound of resin per hour of throughput.  
Dew point of the inlet air to the hopper at 0F (-18C) or less.  
Moisture content in the material should be less than 0.03% prior to processing.  


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How does the "Shore-A" hardness scale relate to the "Shore-D" hardness scale?
Elastomeric materials like TPU are differentiated by hardness. A durometer instrument is used to measure surface hardness for the Shore-A and Shore-D scales, the Shore-A scale being softer and the Shore-D scale being harder. Typically, TPUs are made in the 70A to 75D hardness range. The high end of the Shore-A scale overlaps with the low end of the Shore-D scale, so as to provide continuity between the two scales. This often causes confusion in the material selection process. For this reason, we created an abbreviated equivalency chart to facilitate proper selection of materials.

100A ~ 75D
95A ~ 50D
90A ~ 40D
85A ~ 32D


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What type of mold surface is recommended for processing TPU?
Because TPU resins can stick to highly polished surfaces, a rougher mold surface finish may be necessary to provide adequate mold ejection. An SPI D-2 finish (formerly SPE/SPI #5 or vapor hone) is an excellent choice for TPU resin. Where possible, the surface treatment should extend to sprue bushings, runners, etc., to help ensure easy ejection of the entire shot.


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