1.Abrasion resistance
When the material is often subjected to friction, scraping, grinding and other mechanical effects during use, its surface will gradually wear, so the wear resistance of the material is very important. TPU plastic raw material has excellent wear resistance and is more than five times more durable than natural rubber. It is one of the materials of choice for wear-resistant products.
2.Tensile properties
The tensile strength is up to 70MPa, and the elongation at break can be up to 1000%.
3.Tear performance
Elastomers are damaged due to the expansion of cracks during application. They are called tears. Tear strength is the ability of a material to resist tearing. Generally speaking, TPU has higher tear resistance. The comparison of rubber and plastic is excellent.
4.Inflection performance
Many plastic materials are prone to fracture under repeated cyclic stress. TPU products can maintain excellent buckling resistance under different environments, making them one of the best choices for polymer materials.
5, hydrolysis resistance
TPU has good water resistance under turbidity, and no obvious hydrolysis will occur within 1 to 2 years, especially for polyether series. Polyester series will be completely decomposed after being immersed in 50 ℃ water for half a year or 70 ℃ for 3 weeks or 100 ℃ for 3 ~ 4 days. This is one of the reasons why TPU is suitable as an environmentally-friendly material. It is recommended to use polyether series.
6, high temperature and oxidation resistance
General plastic raw materials are easy to oxidize in the environment above 70 ℃ for a long time, and TPU has good anti-oxidation ability. Generally speaking, the temperature resistance of TPU can reach 120 ℃.
7. Oil and chemical resistance
TPU is a highly polar polymer material, and has a low affinity for non-polar mineral oil. It is almost used in fuel oil (such as kerosene, gasoline) and mechanical oil (such as hydraulic oil, engine oil, lubricant, etc.). Not subject to erosion; among them, polyester products of the TPU products have better oil resistance; TPU films and sheets have little change in the volume of oils and fats, and the tensile strength is even higher than the original initial value; it should be noted that If a small amount of water is contained in the mineral oil, the physical properties of the film will be adversely affected to varying degrees.
8.Low temperature performance
TPU has very good low temperature resistance, which can usually reach -50 ° C. It can replace various areas where PVC is not applicable due to low temperature embrittlement. It is especially suitable for use in cold zone related products.
9.Air tightness
TPU is very easy to weld by high frequency or hot pressing, so it is widely used in inflatable products. The gas coefficient refers to the rate at which a gas penetrates a specified area of a sample at a certain temperature and pressure, and the permeability of the same material to different gases sometimes varies greatly. Generally speaking, polyester series products have better air tightness than polyether series.
10.Biomedical performance
TPU has excellent biocompatibility, non-toxicity, non-allergic reactivity, no local irritation, and no pyrogenicity, so it is widely used in medical, health and other related products as well as sports and protection equipment.
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