what is the difference between tpu waterproof breathable membrane and ptfe waterproof breathable membrane?

what is the difference between tpu waterproof and breathable membrane and ptfe waterproof and breathable membrane?

1. ptfe polytetrafluoroethylene:

(1) non-stick: the friction coefficient is very small, only 1/5 of polyethylene, which is an important feature of perfluorocarbon surface. because the intermolecular forces of the fluorocarbon chains are extremely low, ptfe is non-stick

(2) thermal properties: thermal distortion temperature: 1.86 mpa: 55℃; 0.46mpa: 120℃ martin heat resistance temperature: 250℃ continuous use temperature: 250℃.

(3) combustibility: self-extinguishing polytetrafluoroethylene maintains excellent mechanical properties in a wide temperature range of -196 ~ 260°c. one of the characteristics of perfluorocarbon polymers is that they are not brittle at low temperatures.

2.tpu waterproof and breathable membrane:

(1) wide hardness range: by changing the ratio of tpu reaction components, products with different hardness can be obtained, and as the hardness increases, the product still maintains good elasticity and wear resistance.

(2) high mechanical strength: tpu products have outstanding load-bearing capacity, impact resistance and shock absorption.

(3) outstanding cold resistance: tpu has a low glass transition temperature and maintains good elasticity, flexibility and other physical properties at minus 35 degrees.

(4) good processing performance: tpu can be processed by common processing methods of thermoplastic materials, such as injection molding, extrusion, calendering, etc. at the same time, tpu can be processed together with some polymer materials to obtain polymer alloys with complementary properties.

(5) oil resistance, water resistance and mildew resistance.

(6) good recyclability.

tpu waterproof breathable membrane is breathable, but has poor air permeability, which means that the ventilation volume is extremely low and the waterproof effect is good. at the same time, it is a polymer waterproof material with good elasticity and high strength. its waterproof properties are inferior to other materials. incomparable physical performance