Udel® PSU

Plástico transparente com alta resistência e rigidez

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Udel® PSU (polissulfona) é um plástico transparente rígido, de alta resistência e boa tenacidade, que oferece maior resistência ao calor e melhor estabilidade hidrolítica que o policarbonato. Mantém suas boas propriedades mecânicas mesmo quando exposto ao vapor e outras técnicas de esterilização.

Udel® PSU destaca-se em muitas aplicações que possuem contato  com fluidos e substituiu com sucesso o latão em aplicações de água quente pressurizada há mais de 20 anos. Apresenta baixa deformação sob carga  em temperaturas elevadas (fluência) e pode resistir a uma exposição longa e contínua à água clorada quente.

Características principais

• Temperatura de deflexão térmica (HDT) de 174°C (345 °F)

• Alta resistência

• Boa robustez 

• Excelente estabilidade hidrolítica

• Transparente

• Pode ser colorido

Aplicações típicas

• Componentes de torneiras

• Conexões para água quente

• Equipamentos médicos

• Membranas: hemodiálise, tratamento de água, bioprocessamento, alimentos e bebidas, separação de gases

Sulfone Polymers Overview

Sulfone polymers are high-heat plastics with a clear advantage. These amorphous thermoplastics offer more toughness, strength and hydrolytic stability than other transparent plastics.

Product Family

Sulfone polymers are high-heat plastics with a clear advantage. These amorphous thermoplastics offer more toughness, strength and hydrolytic stability than other transparent plastics. They withstand prolonged exposure to water, chemicals and temperatures – handling a broad range of end-use temperatures from -40°C to 204°C (-40°F to 400°F).

Udel® PSU – Rigid, high-strength, semi-tough, transparent plastic that offers higher heat resistance and better hydrolytic stability than polycarbonate (PC). It retains its good mechanical properties when exposed to steam and other sterilization techniques.

HDT of 174°C (345°F), Good practical toughness, Good chemical resistance.

Radel® PPSU – Delivers the highest performance of our sulfone polymers, offering better impact resistance and chemical resistance than polysulfone (PSU) and polyetherimide (PEI).

HDT of 207°C (405°F), Superior toughness and impact strength, Best chemical resistance, R-7000 Series for aircraft interiors.

Acudel® modified PPSU – A family of proprietary formulations that fill the cost-performance gap between PPSU and polysulfone (PSU).

HDT of 197°C (387°F), Better impact strength than PSU, Excellent long-term hydrolytic stability.

Veradel® PESU – Combines good chemical resistance with a high heat deflection temperature of 204°C (399°F), making it a good fit for food service applications. This resin is also inherently flame retardant for use in electronic components and testing devices

HDT of 204°C (399°F), Better chemical resistance than PSU, Inherently flame retardant.

Virantage® Tougheners – Comprehensive range of specialty polymers, oligomers and monomers in a variety of molecular weights and particle sizes. Product forms include powders, fibers and foams. High-temperature tougheners, Improves damage tolerance, Reactive end groups available.

Good-Better-Best Performance Capabilities
 Udel® PSUVeradel® PESUAcudel® mod. PPSURadel® PPSUVirantage® PESU
Aircraft Interiors   
Electrical & Electronics   
Fittings & Manifolds  
Faucet Components  
Food Service  
Fuel Systems    
Medical & Dental Devices   
Sterilization Cases & Trays    

High Heat Resistance

Sulfone polymers are noted for high heat deflection temperatures (HDT) and outstanding dimensional stability. These strong, rigid polymers are the only thermoplastics that remain transparent at service temperatures as high as 204°C (400°F). Even after long-term exposure, the resins do not discolor or degrade.


Hydrolytic Stability

The hydrolytic stability of sulfone polymers makes them highly resistant to water absorption. This combines with heat resistance to deliver reliable long-term performance in hot water and steam, even under autoclave pressures. Unlike other transparent polymers, sulfone polymers are not prone to clouding or crazing.

Retention of Tensile Strength in 96°C Water


Retention of Tensile Strength in 132°C Water for 30 Minutes


Toughness and Impact Strength

Sulfone polymers are extremely tough and do not break in standard unnotched impact tests. They retain their toughness and strength over time, unlike polyetherimide (PEI) which exhibits a significant loss of impact strength and becomes brittle.

Retention of Tensile Strength


Retention of Impact Strength


The impact strength of test plaques heat aged at 190°C (375°F) for 170 hours was evaluated using a Gardner falling dart impact tester. Radel® PPSU absorbs significantly higher impact force than polyetherimide (PEI) without cracking or breaking.

Falling Dart Impact Test


Chemical Resistance

Sulfone polymers have good chemical resistance to many materials, including the following:

  • Aqueous systems
  • Caustics
  • Inorganic acids
  • Aliphatic hydrocarbons
  • Detergents and soaps
  • Certain alcohols

General Indication of Chemical Resistance
General Chemicals
Acids, ConcentratedGoodExcellentFair
Acids, DilutedExcellentExcellentGood
Bases, ConcentratedExcellentExcellentPoor
Baes, DilutedExcellentExcellentPoor
Hydrocarbons, AliphaticExcellentExcellentPoor
Hydrocarbons, AromaticPoorFairPoor
Hydrocarbons, ChlorinatedPoorFairPoor
Hospital Disinfectants
Bleach Solutions, 10%ExcellentExcellentGood
Hydrogen Peroxide, 3%ExcellentExcellentGood
Isopropyl Alcohol, 70%GoodExcellentGood
Phenols, 2%PoorExcellentGood
Sani-Cloth® HBExcellentExcellentPoor
Sani-Cloth® PlusPoorExcellentPoor
Sporotal® 100GoodExcellentExcellent


Udel® PSU and Radel® PPSU are compatible with a full range of commercial sterilization technologies. Because of its high heat resistance and excellent hydrolytic stability, Radel PPSU can be steam sterilized over 1,000 cycles without any significant loss of properties.

COMPATIBILITY WITH sterilization methods
18 Minutes at 134°C
10 cycles

500 cycles

1,000 cycles 

Ethylene Oxide Gas100 cycles

Vaporized Hydrogen
25 cycles

High-Energy Gamma Radiation40 kGy

Transparency and Color

The Solvay family of Sulfone polymers offer transparent, opaque and glass-fiber reinforced grades in natural and colored resins.

Sulfone polymers are the only thermoplastics that remain transparent at temperatures as high as 204°C (400°F). Even after long-term exposure to elevated temperatures, the materials do not discolor or degrade.

The resin’s natural color is transparent light amber. Low-color grades of Udel PSU with a near water-white appearance are available. Solvay uses its proprietary low-color technology to create vibrant transparent colors that give OEMs a clear advantage over metal without compromising performance.

Flame Retardancy

Veradel® PESU and Radel® PPSU are inherently flame retardant. Radel R-7000 Series products are specially formulated for us in aircraft interiors and are in compliance with stringent FAA regulations requiring low heat release, low smoke generation and low toxic gas emissions.