TPU 90A class
Thermoplastic Polyurethane, rated 88 to 92 Shore A
12 products from 10 makers. Bambu Lab lists this material type for the H2C; the listing covers the type, not each brand.
- Tensile modulus (XY)
- 0.0053GPa
- 3 products · 0.0053–0.027
- Tensile strength (XY)
- 23.7MPa
- 5 products · middle half 12.5–30
- Tensile strength (Z)
- 10.1MPa
- 2 products · 10.1
- Not published:
- notched Charpy impact.
- Not applicable:
- HDT at 0.45 MPa.
- Price
- 75CAD/kg
- 2 products · 54–96
TPU 90A class is a flexible thermoplastic polyurethane. Makers sell it for automotive dust covers, bellows, flexible mounts, cable management and prosthetic uses. Printed flat it breaks at > 650 % elongation, and across the layers it keeps 81 % of its flat tensile strength. On the H2C makers advise drying it and not annealing it.
Partly documented Tensile strength (Z) and price rest on 2 products each, tensile modulus (XY) on 3 products and notched Charpy impact is not published. Each figure is the median of the products that publish it comparably, and beside it the middle half of them; a value on a test bar no document describes as printed, or with no stated test load, is set apart, except a heat deflection of a plastic that cannot crystallise, which its glass transition sets, unless its document points to a moulded or resin bar. Products with an added filler or additive are shown but kept out of the medians.
On the H2C
Printing in full- Nozzle
- 220–240 °C
- most products that give one
- Bed
- 30–35 °C
- most products that give one
- Heated chamber
- 25–45 °C
- most products that give one
- Drying
- 50–100 °C, 3–24 h
- 10 of 12 products call for it; 2 more give it as optional
- Nozzle type
- standard
- 1 says a standard nozzle is enough; the rest are silent
No product's setting is beyond the H2C's limits: nozzle 350 °C, bed 120 °C, heated chamber 65 °C.
Among the materials
Against TPU-CF, TPU 90A class is 60 % less expensive. Against TPU 95A class, TPU 90A class is 80 % less stiff, 54 % weaker across the layers and 18 % weaker flat. Among the materials, TPU 90A class has a high elongation at break (XY) and a low tensile modulus (XY), tensile strength (XY) and tensile strength (Z): each is in the top or bottom quarter of the materials that publish it. Its density and price sit in the middle half.
Against its alternatives, TPU 90A class has the lowest tensile modulus
How does it compare with what an engineer would buy instead?
- TPU 90A class: its products' median and middle half
- an alternative
- lowest to highest
- each material's median (top row)
- set apart: test bar not described as printed, or no stated load
- beyond the scale
Each row is a material, each column a property: the bar is the middle half of a material's products, the tick their median, the hairline their lowest to highest; the ticks above the rows are every material's median.
The figure as a table
| Material | Modulus (XY) (GPa) | Strength (XY) (MPa) | Strength (Z) (MPa) | Notched Charpy (kJ/m²) | Price (CAD/kg) |
|---|---|---|---|---|---|
| TPU 90A class (this material) | 0.0053 · 3 | 23.7 (12.5–30) · 5 | 10.1 · 2 | — | 75 · 2 |
| TPU-CF | 0.2 as published (1) | 60 as published (1) | — | 40 as published (1) | 189 · 2 |
| TPU 95A class | 0.027 (0.0166–0.0396) · 11 | 29 (27–34) · 17 | 22 (18.5–22) · 5 | 78 · 1 | 83 · 2 |
| TPE, maker-undisclosed elastomer | 0.15 · 1 | 18 · 1 | — | — | — |
| TPC | 0.048 · 2 | 12.7 · 2 | — | — | 88 · 2 |
| TPS | 0.054 · 1 | 7 · 1 | 2 · 1 | — | 55 · 1 |
TPU 90A class publishes no notched Charpy impact.
Where TPU 90A class sits among the 15 flexible materials on file
Where is it in the landscape: stiffness against strength, heat resistance against price?
- TPU 90A class: median, middle half as a cross
- a TPU 90A class product
- an alternative
- another material
- beyond the scale
Tensile strength (XY) against tensile modulus (XY)
MPa
Tensile modulus (XY), GPa, log scale
Grey points are every other flexible material's medians; the alternatives are named.
The figure as a table
| Material | Tensile modulus (XY) | Tensile strength (XY) |
|---|---|---|
| TPU 90A class (this material) | 0.0053 GPa · 3 | 23.7 MPa · 5 |
| TPU-CF | 0.2 GPa as published | 60 MPa as published |
| TPU 95A class | 0.027 GPa · 11 | 29 MPa · 17 |
| TPE, maker-undisclosed elastomer | 0.15 GPa · 1 | 18 MPa · 1 |
| TPC | 0.048 GPa · 2 | 12.7 MPa · 2 |
| TPS | 0.054 GPa · 1 | 7 MPa · 1 |
Mechanical properties
Printed flat (XY), TPU 90A class typically reaches a tensile strength of 23.7 MPa at a modulus of 5.3 MPa, and breaks at > 650 % elongation.
TPU 90A class's products spread most in tensile strength: the middle half runs 12.5–30 MPa
How strong, stiff and tough are its products, and which stand out?
- a product
- set apart: test bar not described as printed, or no stated load
- added filler or additive, kept out of the median
- middle half and median
- beyond the scale
One mark per product on each property's scale (zoomed where its products sit close together, as its label says); the band is the middle half of the products the median counts, and the line the median.
Hover or select a product to find it in every figure; its name opens its card on the Products page.
The figure as a table
| Property | In the median | Median | Middle half | Lowest in the median | Highest in the median | As published | Added filler or additive |
|---|---|---|---|---|---|---|---|
| Tensile strength (XY) (MPa) | 5 | 23.7 | 12.5–30 | Kingroon TPU 90A, 12.5 | SUNLU TPU 90A, 30 | 4 | 2 |
| Elongation at break (XY) (%) | 5 | 650 | 587–650 | Eryone TPU 90A, 574 | SUNLU TPU 90A, 1,000 | 4 | 2 |
Every TPU 90A class product that publishes these values is drawn; each value, with its document and conditions, is on the Products page.
| Product | Tensile modulus (XY) | Tensile strength (Z) | Notched Charpy impact | Notched Izod impact | Shore D hardness |
|---|---|---|---|---|---|
| Bambu Lab TPU 90A | 0.0053 GPa | 10.1 MPa | not published | not published | not published |
| SUNLU TPU 90A | not published | not published | not published | 5 kJ/m²not described as printed | not published |
| Eryone TPU 90A | 0.027 GPa | not published | not published | not published | not published |
| colorFabb varioShore TPU | 0.05 GPa | not published | 40 kJ/m² | not published | not published |
| colorFabb Prosthetic | 0.05 GPa | not published | 40 kJ/m² | not published | not published |
| Kingroon TPU 90A | 0.0053 GPa | 10.1 MPa | not published | not published | not published |
| Nanovia Flex | not published | not published | not published | not published | 40 Shore D |
In grey, a value a product reads from a data sheet it shares, where its own sheet is silent.
Across the layers (Z), TPU 90A class keeps 81 % of its flat strength and 83 % of its flat stiffness
What does a printed part lose across the layers (Z) against flat (XY), and is that usual?
- a product
- equal share: 100, 75, 50 and 25 %
- TPU 90A class's median share
- an alternative
Tensile strength
Z keeps 81 % of XY, median of 2 products
flat (XY), MPa
Share kept: TPU 90A class 81 % · TPU 95A class 81 %
Tensile modulus
Z keeps 83 % of XY, median of 2 products
flat (XY), GPa
Share kept: TPU 90A class 83 % · TPU 95A class 76 % · TPS 69 %
Elongation at break
Z keeps 54 % of XY, median of 2 products
flat (XY), %
Share kept: TPU 90A class 54 % · TPU 95A class 41 % · TPS 3 %
Each point is a product that publishes both from one sheet: below the 100 % ray it keeps less across the layers than flat. Under each plot, the median share its alternatives' products keep.
The figure as a table
| Product | Property | Flat (XY) | Across (Z) | Z as a share of XY |
|---|---|---|---|---|
| Bambu Lab TPU 90A | Tensile strength | 12.5 MPa | 10.1 MPa | 81 % |
| Kingroon TPU 90A | Tensile strength | 12.5 MPa | 10.1 MPa | 81 % |
| Bambu Lab TPU 90A | Tensile modulus | 0.0053 GPa | 0.0044 GPa | 83 % |
| Kingroon TPU 90A | Tensile modulus | 0.0053 GPa | 0.0044 GPa | 83 % |
| Bambu Lab TPU 90A | Elongation at break | 650 % | 350 % | 54 % |
| Kingroon TPU 90A | Elongation at break | 650 % | 350 % | 54 % |
| TPU 95A class (alternative) | Tensile strength | 81 % · 5 | ||
| TPU 95A class (alternative) | Tensile modulus | 76 % · 1 | ||
| TPS (alternative) | Tensile modulus | 69 % · 1 | ||
| TPU 95A class (alternative) | Elongation at break | 41 % · 2 | ||
| TPS (alternative) | Elongation at break | 3 % · 1 |
Flat and across the layers, property by property
Flat and across the layers
| Property | Printed flat (XY) | Across the layers (Z) | Z as a share of XY | ||
|---|---|---|---|---|---|
| Median | Products | Median | Products | ||
| Tensile strength MPa | 23.712.5–30 | 5 | 10.1 | 2 | 81 %2 products |
| Tensile modulus GPa | 0.0053 | 3 | 0.0044 | 2 | 83 %2 products |
| Elongation at break % | 650587–650 | 5 | 350 | 2 | 54 %2 products |
The middle half of the products under each median. The share is each product's Z value as a part of its XY value, from one sheet and one state, and the median of those shares. How XY and Z differ.
Most TPU 90A class products measure 90 Shore A
How hard are its products, on the Shore scale their sheets use?
- a product
- added filler or additive, kept out of the median
- middle half and median
- beyond the scale
The figure as a table
| Property | In the median | Median | Middle half | Lowest in the median | Highest in the median | As published | Added filler or additive |
|---|---|---|---|---|---|---|---|
| Shore A hardness (Shore A) | 6 | 90 | 90 | Spectrum S-Flex 90A, 90 | Fillamentum Flexfill TPU 92A, 91 | 0 | 2 |
Every TPU 90A class product that publishes these values is drawn; each value, with its document and conditions, is on the Products page.
Thermal properties
Its glass transition is 50 °C. As published, Vicat softening is 54 °C, from one product and melting typically 180 °C.
| Product | Glass transition (Tg) |
|---|---|
| colorFabb varioShore TPU | 55 °C |
| colorFabb Prosthetic | 55 °C |
| Nanovia Flex | 50 °C |
In grey, a value a product reads from a data sheet it shares, where its own sheet is silent.
Not published for TPU 90A class: HDT at 0.45 MPa and HDT at 1.8 MPa.
Printing on the H2C
TPU 90A class softens near 50 °C, below the H2C's 65 °C chamber
What does printing it on the H2C take, and how hot can a part get?
- share of the products that accept each temperature
- what most products accept
- the H2C's limit, and beyond it
- a product
- TPU 90A class: its products' median and middle half
- as published, under each sheet's own test
Printing it on the H2C
In service
°C
One temperature axis for the settings a print needs and the temperatures a part meets. A setting's shade is how many of the products whose sheets give a window accept each degree; the H2C's limit closes its row.
The figure as a table
| Setting or property | Most products, or the median | Products | H2C limit |
|---|---|---|---|
| Nozzle | 220–240 °C | 10 | 350 °C |
| Bed | 30–35 °C | 10 | 120 °C |
| Heated chamber | 25–45 °C | 3 | 65 °C |
| Drying | 50–100 °C, 3–24 h | 9 | — |
| Glass transition (Tg) | 50 °C | 1 | — |
| Vicat softening temperature | 54 °C | 1 | — |
| Melting temperature | 165–180 °C | 3 | — |
Windows read from the Bambu Lab Filament Guide are not shaded: the guide speaks for every product that reads it.
| Setting | Most TPU 90A class products |
|---|---|
| Nozzle | 220–240 °C most products that give one |
| Bed | 30–35 °C most products that give one |
| Heated chamber | 25–45 °C most products that give one |
| Drying | 50–100 °C, 3–24 h 10 of 12 products call for it; 2 more give it as optional |
| Nozzle type | standard 1 says a standard nozzle is enough; the rest are silent |
Where a product's own sheet is silent, its setting comes from a sheet it shares or from the Bambu Lab Filament Guide; each product's card says which.
After printing
Annealing is not recommended for TPU prints, as models with anything other than very simple shapes or structures may deform significantly during the process.
Kingroon TPU 90A, data sheet, p. 3It's not recommended to anneal prints of TPU, or prints with not very simple shape and structure can deform obviously.
Bambu Lab TPU 90A, data sheet, p. 3
What makers say about printing it
Printing advice
Active cooling fan Least amound of cooling as possible. For better overhangs use 50 - 100%
colorFabb varioShore TPU, data sheet, p. 1
Moisture sensitivity
For optimal printing results it is recommended to dry the filament before usage and even 3D print from a dry box for larger prints.
FormFutura Python Flex TPU 90A, data sheet, p. 1
More from makers: odour and emissions, nozzle wear, adhesion between layers, warping and shrinkage and supports and removal
Odour and emissions
Print in a ventilated area.
Nanovia Flex, data sheet, p. 1
Nozzle wear
Ruby or hardened nozzle not necessary
Spectrum S-Flex 90A, data sheet, p. 1
Adhesion between layers
Python Flex TPU 90A shows good adhesion to the print bed and between layers.
FormFutura Python Flex TPU 90A, data sheet, p. 1
Warping and shrinkage
low shrinkage
Spectrum S-Flex 90A, data sheet, p. 1
Supports and removal
Recommended support material PolySupport™ and PolyDissolve™ S1
Polymaker PolyFlex TPU90, data sheet, p. 3
Products
12 products from 10 makers; the most from colorFabb (2) and FormFutura (2).
- Highest tensile strength (XY): Polymaker PolyFlex TPU90, 30 MPa.
These are published values, not recommendations: the selector judges each product against your requirements.
Uses, limitations and chemicals
What it is sold for
Nanovia Flex V0 allows for the 3D printing of flexible parts suitable for high-risk environments thanks to its V0 UL94 non-flammability properties at 0.8mm.
Nanovia Flex, data sheet, p. 1The added silver particles in this formulation, is known to have beneficial ani-bacterial properties, which makes this material well suited for prosthetic and orthopedic applications.
colorFabb varioShore Prosthetic TPU, data sheet, p. 1Automotive applications – Dust covers, bellows, flexible mounts, cable management components.
FormFutura ReForm rTPU 90A, data sheet, p. 1
What makers warn about
Will be very difficult to print with a small nozzle diameter..
Polymaker PolyFlex TPU90, maker's product page or guide, p. 1
2 more
- The sample is submitted by the applicant for testing, sample source information is provided by the applicant and the laboratory is not responsible for its authenticity, the results shown in this report refer only to the sample(s). after Waltek Testing Group (Foshan) Co., Ltd., Waltek inspection report WTF25F05115022R1F — TPU90A
- 80 after SUNLU, SUNLU TPU 90A official product page (Japanese)
Finish and accuracy
high quality surface
Spectrum S-Flex 90A, data sheet, p. 1
Chemicals and environment
| Exposure | What makers say |
|---|---|
| Flammability | Flammable, in its one statement |
| Acid resistance | Mixed, 5 statements disagree |
| Alkali resistance | Mixed, 5 statements disagree |
| Organic solvent resistance | Mixed, 2 statements disagree |
| Oil and grease resistance | Mixed, 4 statements disagree |
| Water solubility | Insoluble, in its one statement |
| UV and outdoor | Described in words, with no rating, in all 5 statements |
| Food contact claims | Described in words, with no rating, in its one statement |
Makers rarely give the concentration, temperature or duration: treat them as indications, not design data. Each product's statements are on its card.
Resin reference data (for plain TPU, where no maker of these products speaks): it is not resistant to hot water, moisture vapour, tropical climate (polyester-based TPU); it resists hot water, moisture vapour, tropical climate (polyether-based TPU). Fillers, pigments and printing change this, so it does not stand for these products.
Density and price
TPU 90A class's density is typically 1,210 kg/m³, the middle half 1,200–1,220 kg/m³, across 10 products. TPU 90A class typically costs 75 CAD/kg, across the 2 products with a regular price in the sample; the lowest is Bambu Lab TPU 90A at 54 CAD/kg.
| Product | Price |
|---|---|
| Bambu Lab TPU 90A | 54 CAD/kg |
| Spectrum S-Flex 90A | 96 CAD/kg |
Regular prices, never sale prices, from 9 Canadian shops and 10 foreign shops, sampled 10 Sep–20 Oct 2026, not live; shipping and tax are not included.
Other properties, as published
10 more properties are published, each under its own sheet's test conditions, so they are listed, not ranked.
The 10 properties, lowest to highest
| Property | Products | Lowest–highest |
|---|---|---|
| Melt mass-flow rate | 5 | 6.1–36 g/10 min |
| Tensile stress at 100 % elongation | 4 | 3.4–8 MPa |
| Tensile stress at 300 % elongation | 4 | 10–16 MPa |
| Abrasion loss | 2 | 35 mm³ |
| Water absorption | 2 | 0.61–0.67 % |
| Mould shrinkage | 1 | 0.1–0.3 % |
| Oxygen index | 1 | 25 % |
| Tear strength | 1 | 85 kN/m |
| Tensile stress at 200 % elongation | 1 | 9 MPa |
| Tensile stress at 400 % elongation | 1 | 19 MPa |
Sources
31 documents from 11 publishers (19 data sheets, 9 makers' product pages and guides, 1 safety data sheet, 1 printer document and 1 reference), read 10 Sep–19 Oct 2026. Each value on TPU 90A class's Products page names its document and page, and links to the original.
Bambu Lab, H2C Filamant Printing Guide (the H2C's printer guide): print settings for 12 products.
Every document (31), by publisher
| Publisher | Documents | Values | Products |
|---|---|---|---|
| Polymaker | 6 | 28 | 1 |
| colorFabb | 5 | 32 | 2 |
| Spectrum | 5 | 9 | 1 |
| Fillamentum | 3 | 8 | 1 |
| FormFutura | 3 | 8 | 2 |
| SUNLU | 2 | 15 | 1 |
| Nanovia | 2 | 9 | 1 |
| Bambu Lab | 1 | 13 | 1 |
| Kingroon | 1 | 11 | 1 |
| Eryone | 1 | 8 | 1 |
| Waltek Testing Group (Foshan) Co., Ltd. | 1 | 0 | 1 |
- Bambu Lab, Bambu Filament Technical Data Sheet - TPU 90A
- Bambu Lab, H2C Filamant Printing Guide | Bambu Lab Wiki
- colorFabb, colorFabb Print Support– 3D Printing Guides, Tips & Support
- colorFabb, Technical datasheet colorFabb varioShore TPU
- colorFabb, Technical datasheet colorFabb varioShore TPU
- colorFabb, Technical datasheet varioShore Prosthetic TPU
- colorFabb, Technical datasheet varioShore TPU
- Eryone, Technical Data Sheet (TDS) TPU 90A
- Fillamentum, Drying of filaments before processing on 3D printer
- Fillamentum, Flexfill TPU 92A
- Fillamentum, Flexfill TPU92A Additional information; chemical matrix explicitly covers all Flexfill types
- FormFutura, Python Flex TPU 90A
- FormFutura, Technical Data Sheet Python Flex TPU 90A
- FormFutura, TECHNICAL DATA SHEET ReForm rTPU 90A
- Kingroon, KINGROON Filament Technical Data Sheet V1.0 TPU 90A
- Nanovia, MSDS / FDS Flex V0 : Résistant au feu Shore 90A/40D
- Nanovia, Nanovia Flex V0 : Fire resistant Shore 90A/40D : Nanovia
- Polymaker, PolyFlex TPU90
- Polymaker, PolyFlex TPU90 Technical Data Sheet V5.5
- Polymaker, PolyFlex™ TPU90
- Polymaker, PolyFlex™ TPU90 Technical Data Sheet
- Polymaker, Polymaker PolyFlex TPU90 official product page
- Polymaker, Sep. 2020 Technical Data Sheet Version 4.2 PolyFlex™ TPU90
- Spectrum, 3D Printing Filament Manufacturer PRODUCT PORTFOLIO
- Spectrum, Filament drying - Spectrum Filaments
- Spectrum, Spectrum Filaments Product Portfolio 2025 — Prografen pp28–29
- Spectrum, TECHNICAL DATA SHEET S-Flex 90A
- Spectrum, TECHNICAL DATA SHEET S-Flex 90A
- SUNLU, SUNLU TPU 90A official product page (Japanese)
- SUNLU, TECHNICAL DATA SHEET ISO TPU 90A
- Waltek Testing Group (Foshan) Co., Ltd., Waltek inspection report WTF25F05115022R1F — TPU90A