PEI, made from ULTEM 9085 resin PEI-9085
Housings, ducts and covers that need a flame-resistant plastic and stay stiff when warm.
In plain words
Good for
Housings, ducts and covers that need a flame-resistant plastic and stay stiff when warm.
Not for
Parts that take sharp hits: it stretches very little before it breaks.
Larger orders
A high-temperature plastic we don't print in house. We take it on for larger orders, and the lead time is quoted with the order.
Upright is weaker
A printed part is strongest along its layers (flat, X-Y) and weaker across them (upright, Z). This maker publishes flat numbers only. We turn the part so the load runs along the layers.
The full data sheet
Every number on this page is copied from the filament maker's technical data sheet (TDS Rev 4.0). The PDF has the test methods and print settings.
Download the manufacturer's datasheet (PDF)Source: https://cdn.shopify.com/s/files/1/0625/4185/6821/files/THERMAX_PEI_9085_TDS_v4.pdf?v=1723942766, linked from the maker's product page. Checked 2026-10-30.
Key numbers
As printed on the maker's data sheet. "Not published" means the data sheet does not give it.
| Property | Flat (X-Y) | Upright (Z) |
|---|---|---|
| Tensile strength | 54 MPa | Not published |
| Bending strength | 90 MPa | Not published |
| Stiffness (bending modulus) | 2170 MPa | Not published |
| Property | Value |
|---|---|
Bends under light load atHDT 0.45 MPa | 158 °C (316 °F) |
Glass transitionTg | 186 °C (367 °F) |
| Density | 1.34 g/cm³ |
Flame ratingUL 94 | UL 94 V-0 at 1.5 mm (base resin, per the TDS) |
Test conditions from the data sheet: XY flat specimens, per the TDS. These are lab numbers for test bars, not a working limit for your part. The real limit depends on the load, the time at temperature and the shape, which is why we ask about all three.