TPU has good resistance to oils (mineral oil, animal and vegetable fats and lubricants) and many solvents; TPU also has good weather resistance and excellent resistance to high power rays. The well-known abrasion resistance, tear resistance, and yield strength are all excellent; high tensile strength, large elongation, and low long-term compression set rate are all significant advantages of TPU.
　　In the actual design of formulations and industrial production, the raw materials (polyols, polyisocyanates, and chain extenders) are restricted by each other, so it is still very difficult to develop real high-end applications. TPU ink is used on metal and glass, with poor adhesion and easy paint peeling.
　　 TPU plastic raw material injection molding pay attention to: the main reasons for the occurrence of various undesirable phenomena in injection molding are:
　　1. Caused by differences in the nature of the plastic materials themselves;
　　2. Molding conditions such as temperature, pressure, shooting rate, etc. are set improperly;
　　3. Due to defects in the design or production of the molding die;
　　4. The shape and thickness of the molded product are caused by poor design;
　　 5. Improper selection of injection molding machine.
　　Insufficient ability. In fact, the reason for poor injection molding is not simple. It is usually caused by the interlocking of the above factors. The determination of the cause of failure depends on the experience and skill of the operator. It is recommended to consult relevant professionals before processing to reduce loss costs.
　　 Is TPU material toxic?
　　 is not toxic. Generally speaking, TPU materials are environmentally friendly materials that can be in contact with human skin for a long time, and a very small number of people may develop allergies. In addition, some TPU materials can also be in contact with food, and even some medical fields need to use TPU materials. So TPU material is safe.
　　 TPU is a new type of environmentally friendly material, safe, non-toxic, non-hazardous, recyclable and recyclable. It has a wide range of applications, most of which are used in mobile phone protective sleeves TPU, smart wristband TPU, film TPU, cable material TPU, and so on. TPU has very controllable properties. It can be formulated into medical grade, food grade, flame retardant and other grades, and it can pass the human skin contact test. TPU is gradually replacing the raw material of silica gel in application, because TPU can be recycled and reused, and TPU has more advantages in terms of price. TPU has simple processing performance and can be processed by ordinary injection molding machines. It has the advantages of good elasticity, high hardness, wear resistance and oil resistance, high transparency and so on.
　　TPU material has the following characteristics:
　　1. High mechanical strength: TPU products have outstanding bearing capacity, impact resistance and shock absorption performance.
　　2. Outstanding cold resistance: The glass transition temperature of TPU is relatively low, and it still maintains good elasticity, flexibility and other physical properties at minus 35 degrees. The well-known abrasion resistance, tear resistance and yield strength are all excellent.
　　3. Oil resistance: The oil resistance of TPU is better than that of nitrile rubber, and it has an excellent oil resistance life.
　　4. Good processing performance: TPU can be processed by common thermoplastic material processing methods, such as injection molding, extrusion, calendering and so on. At the same time, TPU and certain polymer materials can be processed together to obtain polymer alloys with complementary properties. It is resistant to oil, water and mold. Good recyclability.
　　5. Food and medical hygiene: TPU has biocompatibility and anticoagulant properties, and medical TPU is more and more widely used. Such as blood transfusion, ureter, infusion tube. TPU does not contain enhancers, is non-toxic and tasteless, and is widely used in the food industry.