RANGE POLYSULFONE - PSU -
Characteristics of the PSU
• Good resistance over a wide range of temperatures.
• Good creep resistance.
• Good chemical resistance.
• Good electrical properties
• Good hydrolysis resistance
• Polysulfone has excellent resistance against ß and g rays, X rays and infra-red rays
• Polysulfone is insensitive and highly permeable to microwave oven radiation.
• PSU received the MIL-P 46 120 (MR) military specification, FDA approval (§ 177 - 2500) for food contact, approval from the "National Sanitation Foundation" for use in drinking water pipe framework, and approval from the 3A Sanitary Standards for use in dairies.
• PSU can be affixed using epoxy adhesives, polyurethane adhesives, and combinations of synthetic resins (Bastik 2225). It is not recommended to use cyanoacrylates, anaerobic adhesives, and polyester containing styrol. For solvent gluing, it is necessary to use a 5% solution of PSU in methylene chloride.
• Gluing using heat-cured epoxy adhesive presents the best resistance.
• PSU has excellent electrical properties, which remain stable up to 175°C.
• The loss factor at 50 Hz is 0.001 from 20°C to 120°C, and it reaches 0.002 at 160°C.
• The loss factor at ambient temperature varies from 0.001 at 50 Hz up to a maximum of 0.0035 at 1 Mhz, then to a minimum of 0.002 at 10 Mhz and goes up to 0.005 at 1010 Hz.
• The dielectric constant at 50 Hz of 3.1 at 20°C drops to 2.7 at 170°C.
• Volume resistivity and surface resistivity are not altered by temperature.
• PSU has good tensile resistance of 72 N/mm² and a good elastic modulus, 2500 N/mm² in tension, 2690 N/mm² in flexion.
• At 175°C, the flexural modulus remains above 1750 N/mm².
• At 160°C, the tensile strength is 40 N/mm².
• Although PSU, like all thermoplastics, has a tendency to creep under a constant load, this creep at a temperature of 100°C only increases by 2% after 5000 hrs, under a load of 21N/mm².
• Some mechanical properties improve after ageing at 150°C After a stay of 2 years at 150°C, decreased impact resistance is noted, but there is also an increase in tensile strength, from 70 to 90 N/mm², in the elastic modulus from 2480 à 2750 N/mm², and the heat deflection temperature increases by 14°C.
• PSU's good thermal properties are explained by the strength of the chemical bonds (high degree of resonance), and the usage range
- 100°C to + 150°C.
• Heat deflection temperature (HDT - 1.8 N/mm²) 175°C.
• Glass transition temperature of around 180°C.
• Fusion zone of ~320°C.
• PSU is highly resistant to hydrolysis, which enables autoclave sterilisation.
• Polysulfone is highly resistant to mineral acids, to alkalines and saline solutions, its resistance to detergents and mineral oils is good, even at high temperatures.
PSU is self-extinguishing and corresponds to UL94 HB classification for 3.05 mm and V0 for 4.47 mm. It exists in V0 quality for 1.47 mm, and all fibreglass reinforced qualities are classified V0 for 1.57 mm.