{"id":164464,"date":"2022-03-02T16:13:49","date_gmt":"2022-03-02T08:13:49","guid":{"rendered":"https:\/\/facfox.com\/docs\/?post_type=kb&p=164464"},"modified":"2023-01-09T14:45:00","modified_gmt":"2023-01-09T06:45:00","slug":"glass-transition-temperatures-of-pla-petg","status":"publish","type":"kb","link":"https:\/\/facfox.com\/docs\/kb\/glass-transition-temperatures-of-pla-petg","title":{"rendered":"Glass Transition Temperatures of PLA & PETG"},"content":{"rendered":"

Different materials go from a hard to soft at different temperatures. Learn all about PETG and PLA glass transition temperatures.<\/p>\n

How Warm Can You Go?<\/h3>\n
\"\"
This spool is made of a material with a low glass transition temperature (Source: accountnumber3 via Reddit)<\/figcaption><\/figure>\n

You may know a material\u2019s melting point and ideal\u00a0nozzle<\/a>\u00a0temperature, but glass transition temperature is an entirely different measure for\u00a03D printing filament<\/a>. Glass transition temperature describes the point at which a material begins turning from a solid to a gooey, viscous state. In other words, it\u2019s when a material officially begins to leave a completely solid form.<\/p>\n

Glass transition temperature is helpful for a few reasons. Mainly, it tells you the thermal limits of a material: how much you\u2019ll be able to heat it before it starts deforming.<\/p>\n

You can apply this information to decide if parts made in a certain material are capable of performing specific tasks. For example, if you\u2019re 3D printing a part that\u2019ll be placed in the engine of a car \u2013 where it\u2019ll be very hot \u2013 you should check the glass transition temperature of filaments to choose the right material for the job.<\/p>\n

In this article, we\u2019ll go over the glass transition temperatures of\u00a0PLA\u00a0and\u00a0PETG\u00a0filament and how this information can be used. Before we get to the specific values, we\u2019ll discuss how glass transition temperatures relate to 3D printing and filament in general.<\/p>\n

Effects on Filament<\/h3>\n
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You can use the glass transition temperature to find a suitable bed temperature (Source: TechAbrel)<\/figcaption><\/figure>\n

Glass transition temperature can be especially useful in 3D printing to find a reliable bed temperature. Typically, the glass transition temperature of a filament should be the bed temperature that you print the filament with. That\u2019s because the bed value should grant the print enough heat to soften up for better surface and layer adhesion.<\/p>\n

You should definitely not be printing with a number significantly higher than the glass transition temperature because you don\u2019t want the filament to soften too much. A part melting on the bed isn\u2019t welcome!<\/p>\n

Speaking of melting, it\u2019s important to remember that glass transition temperature isn\u2019t the melting point of a material. The melting point is the temperature at which a material turns to liquid, while the glass transition temperature is when a material turns from a glass solid to a more\u00a0rubbery<\/a>\u00a0state.<\/p>\n

To better understand this, think of a filament at room temperature as a brittle, hard plastic. At the melting point, the filament melts into a liquid, but the glass transition temperature softens the filament to a state in-between that of a solid and a liquid. It\u2019s also the minimum point at which a part can deform (and warp<\/a>), causing a part starts to lose its\u00a0strength<\/a>.<\/p>\n

Now that we know a bit more about glass transition temperatures in 3D printing, let\u2019s find out what they are for\u00a0PLA<\/a>\u00a0and\u00a0PETG<\/a>!<\/p>\n

The Numbers<\/h3>\n
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Glass transition is key to designing strong heat set inserts (Source: LulzBot)<\/figcaption><\/figure>\n
\n
\n
\n

To get right to it, the glass transition temperature of PLA is usually between 55 to 60 \u00b0C, according to\u00a0ScienceDirect<\/a>. That\u2019s why you should be printing\u00a0PLA at a bed temperature<\/a>\u00a0around that mark.<\/p>\n

Also, keep PLA\u2019s very low glass transition temperature in mind when choosing it or other materials for certain parts. As\u00a0MatterHackers points out<\/a>, leaving a PLA part on your car dashboard on a hot summer day could significantly deform the part.<\/p>\n

PETG has a slightly higher glass transition temperature, normally leaving its solid-state at around 85 \u00b0C, according to\u00a0Filament2Print<\/a>. Just like PLA, you should be printing with a bed temperature value around the glass transition temperature. Keep this value in mind when choosing where you want to use PETG parts. (For a more accurate glass transition temperature, you can always check with the manufacturer of the specific filament you\u2019re using.)<\/p>\n

Source: https:\/\/all3dp.com\/2\/pla-petg-glass-transition-temperature-3d-printing\/<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Different materials go from a hard to soft at different temperatures. Learn all about PETG and PLA glass transition temperatures. How Warm Can You Go? You may know a material\u2019s melting point and ideal\u00a0nozzle\u00a0temperature, but glass transition temperature is an entirely different measure for\u00a03D printing filament. Glass transition temperature describes the point at which a […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"kbtopic":[122],"kbtag":[126,701,280,287],"class_list":["post-164464","kb","type-kb","status-publish","hentry","kbtopic-mtl","kbtag-3d-printing","kbtag-glass-transition","kbtag-petg","kbtag-pla"],"yoast_head":"\nGlass Transition Temperatures of PLA & PETG - FacFox Docs<\/title>\n<meta name=\"description\" content=\"Different materials go from a hard to soft at different temperatures. Learn all about PETG and PLA glass transition temperatures. 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