Ultem® is a type of high-performance thermoplastic known for its high heat resistance, high strength, and excellent dimensional accuracy. It is a brand of polyetherimide (PEI) plastics manufactured by the SABIC company.
Here are some key material properties of Ultem:
Thermal Properties: Ultem has excellent heat resistance and can withstand temperatures of up to 340 degrees Fahrenheit (170 degrees Celsius) in continuous use. It also has low thermal conductivity and high flame resistance, making it a safe material for high-temperature applications.
Mechanical properties: Ultem is known for its high tensile and bending strength, as well as its excellent impact resistance. It also has high creep resistance, which means it can handle constant loads well.
Chemical Resistance: Ultem is resistant to many common solvents and chemicals, including acids and bases. However, it has limited resistance to strong acids and oxidizing chemicals.
Electrical Properties: Ultem has excellent dielectric properties, making it a good choice for electrical and electronic applications.
Dimensional accuracy: Ultem is known for its excellent dimensional stability and dimensional accuracy, even at high temperatures.
Environmental Resistance: Ultem has good resistance to UV radiation and weathering, making it a good choice for outdoor applications.
It is important to note that these properties may vary depending on the specific type and treatment of Ultem. For example, filled Ultem may have higher strength and stiffness, while unfilled Ultem may be more transparent and easier to process. For specific applications, therefore, the exact type and treatment of Ultem should always be considered.
The production of Ultem components, whether by injection molding, extrusion or machining, requires specialized knowledge and skills due to its high processing temperatures and unique material properties. Here are some things to keep in mind when manufacturing Ultem parts:
1. Processing temperature: Ultem requires high processing temperatures, typically between 600 and 700 degrees Fahrenheit (315 and 370 degrees Celsius). This requires special equipment and control mechanisms to ensure that the material is heated and processed correctly.
2. Drying: Ultem absorbs moisture from the environment, which can cause processing problems. It is therefore important that the material is thoroughly dried before processing.
3. Tool design: Due to its high processing temperatures and high shrinkage rate, the design of the tools and molds must be carefully planned to minimize distortion and dimensional deviation.
4. Cooling system: An efficient cooling system is important to ensure uniform cooling and thus good dimensional accuracy of the finished component.
5. Surface Treatment: Ultem has an inherent surface smoothness that makes post-treatment difficult. Special techniques such as plasma or flame treatment may be required to achieve good adhesion of paints or adhesives.
6. Safety: Due to the high processing temperatures and the release of potentially hazardous gases during processing, appropriate safety measures are required.
It is always recommended to work with material manufacturers or professionals to ensure that the specific requirements of a project are met and the best results are achieved.
