What Is The Different Between Polyester TPU And Polyether TPU-2

Small changes in the chemistry dictate how the TPU behaves. Polyester TPUs are made from polyols that contain ester groups, leading to excellent abrasion and chemical resistance, and superior tensile strength. They are also compatible with polar plastics like PVC. Polyether TPUs made from polyols containing ether groups impart excellent hydrolysis and microbial resistance along with outstanding low temperature resistance.
Aromatic and Aliphatic grades of TPU refer to changes made to the diisocyanate section of the TPU, where Aromatics are the most commonly available, having good abrasion resistance and tensile strength. Aliphatic grades have excellent clarity and won't oxidize under UV radiation and don't turn yellow, therefore they are used mostly in clear and/or outdoor applications.
Working with Ester and Ether Polyurethanes
When selecting the grade of TPU for an application, one should consider the environment where it will be used, operational and environmental temperatures, indoor or outdoor, chemical, and mechanical stress on the material, and to what additional material does it need to adhere. These are some of the key questions that will help narrow down the search. While polyester and polyether polyurethanes have similar durometer ranges, they have many major differences. Below are some of the specific differences between the two:
Polyester TPU main characteristics:
Excellent abrasion and tear resistance
Good tolerance to high temperature
High elastic properties
Superior tensile and mechanical strength
Improved chemical resistance
Oil/solvent resistance
Abrasion Resistance Properties