How about tpu? This issue cannot be generalized, and should be analyzed according to specific circumstances. Here is a brief introduction to the characteristics of tpu.
The main characteristics of TPU are:
Wide range of hardness: By changing the ratio of each reaction component of TPU, products with different hardness can be obtained, and as the hardness increases, the products still maintain good elasticity and wear resistance. High mechanical strength: TPU products have outstanding bearing capacity, impact resistance and shock absorption performance.
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.
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. Resistant to oil, water and mold. Good recycling.
As an elastomer, TPU is a material between rubber and plastic. From its rigidity, the rigidity of TPU can be measured by the elastic modulus. The elastic modulus of rubber is usually 1~10Mpa, TPU is 10~1000Mpa, plastic (nylon, ABS, PC, POM) is 1000~10000Mpa. The hardness range of TPU is quite wide, ranging from Shore A 60 to Shore D 80 and has high elasticity in the entire hardness range; TPU is flexible in a wide temperature range of -40 to 120°C without plasticizer; TPU It 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-energy rays. The well-known abrasion resistance, tear resistance, and flexural strength are all excellent; high tensile strength, large elongation, and low long-term compression set are all significant advantages of TPU.