> For the complete documentation index, see [llms.txt](https://wiki.polymaker.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.polymaker.com/polymaker-products/polymaker-filaments/prime-materials/functional-pla/ht-pla-pro.md).
# HT-PLA Pro
**Heat Ready. Impact Ready. Still PLA**
Polymaker™ HT-PLA Pro is a tough PLA for functional parts that need better durability in real-world use. It prints as easily as standard PLA and keeps its shape without load in warm environments. It is made for makers, engineers, and print farms that need real durability without added printing complexity.
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**Won't sag up to 150 °C straight off the plate**
Polymaker™ HT-PLA Pro is designed to keep its shape in heat-exposed environments without load. Its Vicat softening temperature reaches **148.3 °C** straight off the build plate and **150.5 °C** after **annealing**, tested off the plate with no load. For applications that require heat resistance under load, annealing is needed. A 30-minute anneal at 100 °C increases the Heat Deflection Temperature (HDT @ 0.45 MPa) from 56.3 °C to **107.6 °C**. This makes it better suited for warm-use cases such as sunlit windowsills or parts placed near heat-emitting machinery.
**2x PLA durability**
HT-PLA Pro keeps strong thermal properties while improving mechanical performance. Compared with regular HT-PLA, it delivers more than **2x higher impact strength** (9.94 kJ/m² vs 4.94 kJ/m²) and **30% higher Z-axis interlayer adhesion** (**26.8 MPa** vs 20.8 MPa). This helps printed parts resist impact and splitting along layer lines.
**Prints with PLA settings**
Unlike many high-temperature filaments, HT-PLA Pro prints with standard PLA settings. It runs on most standard FDM printers, with no enclosure, no specialty hotend, and no complex tuning required. Supporting print speeds up to **300 mm/s**, it can fit into existing production workflows with minimal changes.
**Please note: Annealing is required for heat resistance under load. Annealing can lead to increased chances of warping deformation of your print.**
Click the [HERE](/printing-tips/post-processing/annealing/annealing-tips.md) to view the annealing recommendations. Even when following the guidelines please note that deformation changes are possible.
{% embed url="" %}
| Parameter | |
| ----------------------- | ---------------- |
| Nozzle temperature | 230 (℃) |
| Build plate temperature | 25 - 65 (˚C) |
| Cooling fan | ON |
| Printing speed | up to 300 (mm/s) |
| Retraction distance | 1 - 3 (mm) |
| Retraction speed | 20 - 40 (mm/s) |
| Closure Chamber | No |
Can you anneal Polymaker™ HT-PLA Pro?
Yes you can for an increased HDT. Please refer to the annealing guidelines for 3D-printed PLA parts.
Please refer to the annealing guidelines for 3D-printed PLA parts.
* First, choose a suitable heating device for annealing. The best option is a temperature-uniform heating chamber, such as a forced-air drying oven. If you use a household oven, the side facing the heating elements may overheat and soften too much. To reduce this risk, wrap the part in aluminum foil. You can also use a water bath or oil bath, but avoid contact with the bottom of the container to prevent overheating and softening.
* Second, preheat the heating device to 100 °C. Once the target temperature is reached, preheating is complete.
* If space allows, keep the part attached to the printer bed and place the full assembly into the oven. Make sure the bed is at the bottom and the part faces upward.
* Annealing time depends on the thickness of the printed part:\
Less than 4 mm: 30-60 min\
6 mm: 1-2 hours\
8 mm: 2-4 hours\
10 mm: 3-6 hours
* After the required annealing time, let the part cool down in the oven before removal.\
The annealing process is then complete.
* The expected dimensional change after annealing is 0.3-0.6%, with slight differences between the XY and Z axes.
* If space is limited and the part must be removed from the build plate, do not remove the support structures. Place the part in the oven in its original printing orientation.
* Large or thick-walled parts are more challenging to anneal. Use a programmable oven where possible. First hold the part at 60 °C until the internal temperature is uniform, then heat quickly to 100 °C, or transfer it directly to a preheated 100 °C oven to reduce the risk of permanent deformation.
More [Annealing Tips](/printing-tips/post-processing/annealing/annealing-tips.md)
Is it tougher than HT-PLA?
Yes. HT-PLA Pro has 2x the impact strength of HT-PLA and regular PLA, with improved layer bonding strength.
What is Heat Stability?
The ability to withstand high temperatures without deformation while NOT under a\
load. If you want an increased heat resistance under load - you will need to anneal the print.
Can it print with PLA settings?
Yes! This material prints great with generic PLA settings. We do suggest closer to 230C printing temperature which is on the higher end for PLA.
Are Polymaker™ HT-PLA’s hygroscopic?
It has similar hygroscopic properties to PLA.
Are Polymaker™ HT-PLA’s UV / Weather resistant?
Its UV resistance is on par with standard PLA. For sustained direct outdoor UV exposure, ASA is the better choice.
What is the shrinkage rate?
Very minimal, similar to generic PLA. Can deform/shrink while annealing if not following our [annealing tips.](/printing-tips/post-processing/annealing/annealing-tips.md)
Is it dishwasher safe?
This depends on the 3D print and how sturdy it is. If you have thin walls they may be subject to warping due to the harsher environment.
What is the highest speed you can print at?
HT-PLA Pro can print up to 300mm/s if you are using a high flow hotend setup. If you ever experience weakened layer adhesion, it would be suggested to reduce speeds.
Does it has fumes when printing?
It will be similar to standard PLA
Can I anneal HT-PLA Pro in boiling water?
Yes you can, however if you have hard water with high mineral content, boiling your part can cause the minerals to form a white dust coasting on the surface. More [annealing tips](/printing-tips/post-processing/annealing/annealing-tips.md).
## [Printing Profiles](/polymaker-products/printer-profiles/legacy-profiles-by-material/pla/ht-pla.md)
## Documents
[TDS](/polymaker-products/more-about-our-products/documents/technical-data-sheets/pla/ht-pla-pro.md)
[SDS](https://app.air.inc/a/bbb39013d)
[Other Docs](/polymaker-products/more-about-our-products/documents/certifications-and-declarations.md)
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