High-Performance Polymer Ultem 1000: Properties, Processing, and Design Guide

Traditional engineering plastics (e.g., Nylon 66, POM) often underperform under high temperatures or strong chemical corrosion, while metallic materials (e.g., stainless steel), though strong, come with limitations such as weight, high processing costs, and electrical conductivity. Do you have requirements for materials with high temperature resistance, chemical cleaning resistance, flame retardancy, electrical insulation, and easy sterilization? Ultem 1000 resin is an engineering plastic that meets the above needs while providing good mechanical strength, heat resistance, and dimensional stability, making it highly suitable for aerospace, semiconductor manufacturing, and precision medical devices.

This article will introduce the core properties of Ultem 1000, a translucent deep amber or black engineering plastic, that make it a material choice for custom parts, and provide you with suggestions regarding the processing and design of Ultem 1000 parts. At the end of the article, we will also share a case study from our factory on solving the assembly misalignment issue of precision Ultem bushings.

What is Ultem 1000? What are its Core Properties?

Ultem 1000 belongs to the most basic and classic unfilled grade (Unfilled Grade). In appearance, Material Ultem 1000 usually has two standard options (more other colors can also be specified if required):

• Amber translucent (Natural color): Features a unique translucent deep amber color.

• Black (Ultem 1000 Black / Black Ultem 1000): An industrial black that meets specific exterior design or light-shielding requirements.

You can review the main properties of Ultem 1000 below to determine if it meets your requirements for part performance:

1. Good strength, rigidity, and high temperature resistance

Ultem 1000 possesses excellent tensile strength and modulus, exhibiting good stability in physical and mechanical properties even in continuous high-temperature environments.

• Tensile Strength: Can reach approximately 105 to 110 MPa (about 15,200 psi) at room temperature, far exceeding ordinary engineering plastics (such as nylon or polycarbonate).

• Tensile Modulus: Up to approximately 3,200 to 3,300 MPa (about 46,000 psi), which gives Ultem 1000 parts excellent structural rigidity.

• High Temperature Resistance: Its continuous use temperature can be as high as 170°C (340°F), the relative thermal index (RTI) can reach up to 180°C, and the glass transition temperature (Tg) is as high as 217°C.

• Supplementary Ultem 1000 Density: Around 1.27 g/cm³. Compared to aluminum (about 2.7 g/cm³) or steel (about 7.8 g/cm³), it achieves better lightweight weight reduction when replacing metals.

This means that under many high-temperature operating conditions where ordinary plastics would have already softened and deformed, Ultem 1000 can still maintain its structural rigidity.

For example, Ultem 1000 is recommended for producing semiconductor test sockets, overhead lighting covers and junction boxes inside passenger aircraft cabins, and core valve bodies of coffee machines or high-pressure washers.

2. Excellent flame retardancy and low smoke toxicity

The aerospace and rail transit industries require flame retardancy. Ultem 1000 is inherently flame-retardant and can achieve UL94 V-0 and 5VA ratings without adding flame-retardant additives. In addition, in the NBS smoke evolution test, it generates minimal smoke when burning, and the toxicity of its combustion products is extremely low (almost equivalent to wood burning). For safety reasons, interior trims, electrical enclosures, etc., in aerospace and rail transit can prioritize Ultem 1000.

3. Well-performed Chemical Resistance

Ultem 1000 has excellent resistance to chemical corrosion. It can maintain its mechanical strength and exhibit outstanding resistance to stress cracking during long-term contact with automotive fluids, aircraft fuel, aliphatic hydrocarbons, alcohols, acids, and dilute aqueous solutions. For parts in industrial environments flooded with various oil stains and chemical cleaning agents, such as chemical pipeline valves, fuel tank seals, gearbox control valve blocks, and nozzles and fixtures on processing cleaning lines, Ultem 1000 can be used for manufacturing.

4. Excellent insulation properties

As a high-performance insulation material, Ultem 1000 maintains extremely stable electrical insulation performance and dielectric constant (Dielectric Constant) over a wide range of temperatures and frequencies. High dielectric strength makes it an excellent factory plastic choice for high-voltage electronic and electrical components, semiconductor test fixtures, and internal components of switchgear.

5. Easy sterilization

In medical and pharmaceutical applications, parts are required to have the durability to withstand repeated sterilization. Ultem 1000 can withstand multiple steam autoclaving cycles. In particular, its specialized medical grade—ULTEM™ HU1000 PEI, complies with ISO 10993 or USP Class VI biocompatibility standards and food contact requirements, and can tolerate various sterilization methods such as steam, gamma rays, ethylene oxide (ETO), and electron beams.

For example, surgical instrument trials, positioning guides, medical endoscope and laryngoscope handles, pharmaceutical and bioreactor piping joints, and valve bodies can choose Ultem 1000.

Ultem 1000 vs 1010 vs 2300: What’s the Key Difference?

You might be confused by these similar grades in engineering: Ultem 1000, Ultem 1010, and Ultem 2300. Although they belong to the same polyetherimide family, they have distinct differences in composition and application focus:

Ultem 1010 vs Ultem 1000

Ultem 1010 is a grade specifically designed for higher heat resistance (200°C) and high strength (about 160 MPa), which has a relative quality advantage in manufacturing, for example, high-pressure valve bodies around turbochargers and semiconductor test bases.

In contrast, Ultem 1000, as an unfilled standard pure resin, has better toughness and elongation at break than 1010, which provides a service life advantage in applications such as medical snaps and quick-connect joints with repeated part disassembly, and high-frequency vibration sensor housings.

Ultem 2300 vs Ultem 1000

Ultem 2300 adds a 30% glass fiber reinforcement layer on the basis of 1000. This significantly increases the tensile strength (165 – 170 MPa) and rigidity (9,000 – 9,600 MPa) of 2300.

Furthermore, compared to unfilled Ultem 1000, Ultem 2300 absorbs less moisture. This means that in environments with high humidity or significant temperature fluctuations, Ultem 2300 can maintain better dimensional stability and is less prone to expansion or deformation due to water absorption.

However, because the addition of glass fibers increases tensile strength and rigidity, tool wear for 2300 is faster, and processing difficulty will be higher than material ultem 1000 (which also results in slightly higher CNC machining costs).

How to Choose the Manufacturing Method for Ultem 1000 Custom Parts?

Ultem 1000 resin has excellent melt fluidity, while also possessing structural rigidity and dimensional stability. Therefore, it can be made into parts through various molding processes such as extrusion blow molding, extrusion molding, thermoforming, injection molding, or subtractive precision machining like CNC machining. In actual production, you can choose the most suitable process based on production volume, tolerance requirements, and budget. The following is a horizontal comparison table of the main manufacturing processes for ultem resin 1000 for your quick reference:

For Ultem 1000 parts requiring high precision and complex structural details, CNC machining is the preferred choice for many customers due to its flexibility and accuracy. Below are some examples of precision PEI/Ultem machining projects VMT has delivered for clients:

How to Prevent Machining Deformation of Ultem 1000 Precision Parts Through DFM Structural Design?

We have previously learned that Ultem 1000 possesses high rigidity and strength, so when you choose Ultem 1000 to manufacture precision parts, there will be risks of warping or cracking. Moreover, Ultem 1000 has poor thermal conductivity (0.22 W/(m·K)), which makes it easy to release internal residual stress during cutting. To prevent unreasonable part structural design (such as drastic changes in wall thickness, existence of sharp angles, etc.) from affecting the processing yield of Ultem 1000 parts, you can refer to the following suggestions:

Potential Risks and Suggestions:

• Warping(Overall bending caused by cutting stress)
• Maintain uniform wall thickness:Try to avoid directly connecting large areas of heavy solid structures with extremely thin-walled structures. If there must be a thickness transition, a gradual or sloped design should be adopted. Reduce uneven internal stress generated within the material due to cutting and temperature changes, preventing the part from warping after being unloaded from the fixture upon machining completion.

• Stress Concentration(Plastic parts are sensitive to sharp angle designs)
• Avoid sharp internal corners:Reasonable R angles must be designed at all intersections of internal walls. It is recommended that the minimum internal wall fillet (R) be greater than or equal to 0.8 mm, or at least one-quarter of the wall thickness or more. Sharp corners will become severe stress concentration points in PEI materials, leading to part edge chipping and deformation during processing, or fatigue cracking in subsequent use (such as autoclaving).

• Thin-Wall Instability / Local Outward Deflection(Pushed away during processing due to insufficient rigidity)
• Set reinforcing ribs / Thicken critical thin walls:For suspended or long thin walls, try to ensure the outer wall thickness is above 1.0 mm; if restricted by the structure and must be made thin, be sure to add local reinforcing ribs (Ribs). Improve the structural self-rigidity of the part. Ensure that when the CNC tool cuts at high speed, the wall will not retreat or deflect due to force, thereby effectively guaranteeing mating dimensions.

• Assembly Misalignment(Multi-face processing leads to accumulated errors)
• Concentrate critical features on the same datum plane:Try to design holes, grooves, and mating faces with high precision requirements in the same direction (reducing features that require frequent flipping and processing). Convenient for processing plants to achieve one-time clamping (or 5-axis multi-face one-time machining), avoiding accumulated coaxiality or position errors brought by multiple repositioning and clamping.

• Moisture Absorption Leading to Dimensional Drift(Precision tolerances have trace errors in hot and humid environments)
• Reasonably evaluate tolerance range and choose the grade:If the critical tolerance is tighter than positive or negative 0.02 mm and the working environment is humid, it is recommended to switch to Ultem 2300 (glass fiber reinforced grade), or loosen the tolerance requirements for non-mating faces. Unfilled pure Ultem 1000 still has trace moisture absorption, and there is a possibility that trace errors will appear.

VMT Case Study: Solving the Assembly Misalignment Issue of Precision Ultem Bushings

A well-known enterprise focusing on high-voltage switchgear manufacturing needed to customize a batch of 300 special insulating bushings (Bushing) when developing a new generation of internal components. The parts adopted an integrated flange (Flange) design, containing a cylindrical main body with thin wall thickness. Its critical internal hole diameter tolerance requirements were extremely strict, reaching positive or negative 0.05 mm. The bushing needed to accurately maintain its spatial dimensions after assembly to maintain a fixed insulation gap.

After confirming the drawings with the customer, our engineering team formulated a comprehensive deformation prevention plan:

• Controlled material baking before processing:Unfilled Ultem 1000 is sensitive to trace moisture. Before cutting the material, we conducted a controlled pre-drying treatment (material baking) on the raw materials to prevent local stress release caused by moisture evaporation during the cutting process.
• Design and 5-axis integrated linkage:Unified the datum plane of the flange geometry and the precision internal hole, and used 5-axis CNC linkage equipment for a single clamping. Since the flange outer circle and the center hole were processed in the same coordinate system and the same setup, this avoided repositioning errors brought by secondary clamping or flipping processing.
• Custom wrap-around contour fixtures:In order to fix the cylindrical main body without clamping damage or twisting its thin walls, we specifically designed a set of custom fixtures with arc wrapping. The fixture can evenly distribute the clamping force over the entire cylindrical surface, providing sufficient cutting rigidity while ensuring that the thin wall will not deform.
• 100% in-process inspection and CMM final inspection:Conducted CMM (Coordinate Measuring Machine) in-process inspection of critical dimensions before finish cutting, recorded data, and fine-tuned compensation values. Before packaging, CMM final inspection was performed on all 300 units, and dimensional inspection reports for each batch were attached with the goods.

Result: Through the combination of DFM design optimization and strict precision CNC machining processes, this batch of 300 Ultem 1000 precision insulating bushings was successfully delivered. The customer feedback during the actual assembly process indicated that the consistency of the entire batch of components was extremely high, fitting perfectly and tightly, seamlessly solving the assembly misalignment issue that had appeared previously.

Final Thought

High-performance engineering plastic Ultem 1000 is widely used in medical equipment, automotive, aerospace, electronic, and electrical industries by virtue of its good strength, rigidity, high temperature resistance, chemical cleaning resistance, easy sterilization, flame retardancy, insulation, UV resistance, and various other characteristics. Fully understanding the material properties of Ultem 1000 and conducting reasonable Design for Manufacturability (DFM)—such as maintaining uniform wall thickness, avoiding sharp internal corners, and reasonably planning assembly datum planes, can save you processing costs, drive faster delivery times, and improve the yield rate of parts. Are you suffering from Ultem 1000 part deformation and assembly issues? We have rich PEI (Ultem) CNC precision machining experience and a professional DFM review team. Welcome to contact us at any time, submit your drawings, and get a free technical feasibility assessment and quotation.[2D Drawings (PDF files), 3D Drawings (IGS/STP/STEP files)]