Ultem Machining – Ultem ® / PEI (Polyetherimide)

Ultem Plastic Machining | Plastic MillingPlastic Routing | Plastic Turning | Plastic Fabrication

Most noteworthy, Ultem ® is a high-strength amorphous polymer with excellent heat and flame resistance, (carrying a flammability rating of 94-V-0) with little smoke output. Furthermore, it performs continuously to 340° F, making it superior to commodity plastics such as Nylon and Delrin®. Also, Ultem ® is an ideal solution for applications that require high strength and the ability to withstand high temperatures. Finally, the product also suits applications that require consistent dielectric properties over a wide range of frequencies.

Sentinel CNC Machine Ultem

Always providing exceptional CNC Machined Plastic Parts through 27 years of experience in plastic production. Most noteworthy, having the ability to accomplish tight tolerances. Furthermore, a great depth of knowledge when CNC milling and turning the huge variety of plastic materials available. And, because Sentinel works solely with plastic, we have a focus that gives us an edge over our competitors in the industry.

Where Is It Used

Being hydrolysis resistant and highly resistant to acidic solutions, and is able to tolerate repeated autoclaving cycles, such as with repeated steam sterilization of reusable medical devices. Ultem ® is widely used in electronics because of its good arc resistance and dielectric constant. Therefore, other typical applications include analytical instrumentation and structural components that require high strength and rigidity at elevated temperatures.


Ultem Machining - Machined Ultem Plastic Parts

Key Properties


Most noteworthy, Ultem has excellent stability of physical and mechanical properties, So, at elevated temperatures thanks to high glass transition temperature of 217 °C. Also, available with relative thermal indices (RTI) up to 180 °C


Above all, Ultem has outstanding strength and amorphous thermoplastic among the available alternatives. Also, predictable stiffness and strength up to 200 °C.  Furthermore,  Transparent grades are equal in strength to other thermoplastics with opacifying fillers.


Certainly, the most dimensionally stable thermoplastics available, offering predictability over a wide temperature range. Also, filled grades offer exceptionally high-tolerance dimensional capabilities.


Unlike most other amorphous thermoplastics, ULTEM machining resins retain strength and resist stress cracking when exposed to automotive and aircraft fluids, aliphatic hydrocarbons, alcohols, acids, and weak aqueous solutions.


Inherent flame resistance without additives in most grades – exceptionally difficult to ignite, with a limiting oxygen index (LOI) of 47%, meeting UL94 V0 specifications in sections as thin as 0.41 mm. Generates extremely low smoke per the NBS smoke evolution test, with products of combustion no more toxic than those of wood.


Above all, Ultem can be CNC Machined, turned & milled.

Ultem Machining – Plastic CNC Milling 

Sentinel has eight Plastic CNC Milling machines. All are able to produce almost any cut shape from the extensive range of industrial plastics available in today’s market, Including Ultem Plastic
Having cutting tables, which are capable of taking large sheet sizes up to a maximum of 3000mm x 2000mm and materials ranging from 1mm up to 50mm in thickness. Our top brand name machines are able to achieve high standard finishes and sizes every time.

Ultem Machined Parts

Ultem Machining – Plastic CNC Turning 

Sentinel has four Plastic CNC Turning Lathes  All are able to produce, almost any turned or milled shape, from the extensive range of industrial engineering plastics available in today’s market. Including Ultem Machining.
Our top brand name machines are able to achieve high standard finishes and sizes every time. Ultimately, our experienced at Sentinel has many years experience and knowledge in machine exceptional quality plastic parts. for various industries including medical, subsea and power control.

Standard Shapes and Forms

Sheet: .040” – 4” thick

Rod: .187” – 8” diameter

The range of sizes and shapes are grade specific.


Ultem ® 1000

Ultem ® 1000 is the standard, unfilled grade of Ultem ®. It is resistant to UV and gamma radiation, performs especially well in hot air and water environments, retains 85% of its tensile strength after 10,000 hours of immersion in boiling water and 100% of its tensile strength after 2,000 cycles in a steam autoclave at 270°. Ultem® 1000 is FDA and USP Class VI compliant and USDA and NSF approved. The standard color is amber.

Ultem ® 2300

Ultem® 2300 is a 30% glass-reinforced grade of Ultem ®. The addition of glass fiber provides greater tensile strength and rigidity while at the same time improving the product’s dimensional stability. The standard colors are tan and green.


In Conclusion:

Finally, Sentinel Plastics Ltd is versatile, experienced, flexible, always aiming to be as helpful as possible. If, its plastic cutting , that does not constitute Molding or Extruding then there is a good chance we can help!

Sentinel Plastics








More info: https://www.sabic.com/en/products/specialties/ultem-resins/ultem-resin

Information taken from www.sabic.com & www.aetnaplastics.com