PPSU/PSU

PSU are amorphous and highly transparent thermoplastics that have very high permissible operating temperatures.  Polysulfone is produced from Bisphenol A with 4, 4‘-Dichlordiphenylsulfone through a multi-level poly-condensation process.    

Properties:

Polysulfone is crystal-clear with a light yellow tinge. Within the temperature range of -100°C to 190°C, PSU is hard, stiff, and tough. It demonstrates good abrasion resistance and sliding properties.  With increased stability and stiffness, it has a high elongation of break but also a greater notch sensitivity. PSU possesses a high resistance to chemicals but stress cracking does occur with certain solvents. The material is unstable against aromatic compounds, ketones, chlorinated hydrocarbons, and polar solvents.  It has permeability for hyper-frequency waves, as well as resistance against β, γ, x, and infrared-rays. Due to the fact that PSU breaks down when in contact with UV-rays, material that is to be used for outdoor applications needs to be protected through the use of a pigmentation (examples, carbon black or protective surface coatings).  It has good resistance against high-energy radiation. 

The ignition temperature of polysulfone from an external flame is 475°C.   The flame propagation rate and smoke generation are both low.  PSU is categorized as Class B2 for building materials.  According to ISO 4589, the oxygen index is 32%.  Non-reinforced PSU is categorized as Class VI and reinforced PSU with 3, 2 mm thickness achieves V0 (UL94).   

Areas of Application:

Polysulfone is used in electrical engineering, electronics, automobile manufacturing, mechanical engineering, household appliances, and medical technology.  This material is especially useful when high thermal stability and transparency must be simultaneously achieved.  

Processing:

PSU can be processed using extrusion, injection molding, and blow molding.  When processing with injection molding, melt temperatures between 320°C und 380°C and mold temperatures between 100°C und 160°C are required. Plates and films can be processed by thermoforming.  Painting, metallizing, and machining are possible.  PSU parts can be welded, riveted, and glued. 

The following modifications of PSU are available:  colored/dyed; higher-molecular weight with elevated melting viscosity for extrusion; flame-retardant (also transparent); reinforced PSU with a glass-fiber content of up to 30% for stiffness and strength; and mineral-filled to increase thermal stability and lessen stress cracking. 

PSU-blends with ABS and other plastics for technical applications fulfill the requirements for galvanizing abilities, increased chemical resistance, and economical pricing structures. 

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