Safety Precautions    Safe Printing Temps    Food Safety
Safety First

Safety Precautions

PTFE is a flouropolymer, which exists in a state of matter known as a "glass." This means it does not "melt," like an ice cube, but rather slowly gets softer and softer as it gets warmer. Eventually it will either become a liquid, or catch fire.

Between room temperature and catching fire, all polymers emit tiny amounts of harmful gasses, known as "off-gassing." The hotter they get, the more they will emit. See Chart*

Because our PTFE tends to have better temperature resistance (meaning it stays firmer at higher temperatures before significant deformation) than lower quality PTFE tubes, a number of users have reported success using it "inside the hot end."

This is not something you should do willy-nilly. Just because it works, doesn't mean there aren't precautions to be taken. If you use PTFE, or any polymer for that matter, inside the hot end or anywhere excessive temperatures may be experienced, you will potentially create harmful off-gassing. Not only that, but the polymer you are extruding may be creating harmful gasses as well.

We strongly recommend running your 3D printer in a well ventilated area, away from children and pets.

In a classroom environment, we encourage printing with PLA, and staying away from higher temperature materials, whether you use our Bowden tubing or not.

Always have adult supervision when operating a 3D printer.

Keep razor-sharp Bowden tubing cutters out of reach of children.

Have fun, and stay safe out there!

Safe Printing Temperatures

"Can I print X in my Y printer with your tubing?"

This question has as much to do with safety as it does whether it physically "will work." Small amounts of off gassing are harmless to humans, but dangerous to pet birds living in the house, for example.
In order to try and answer this, we've come up with this handy chart. This applies to situations where the PTFE is INSIDE the hot end, experiencing the full heat of the nozzle.
Temp (Deg C) Will it work? Is it Safe?
170 YES YES. This temperature is perfectly safe for printing PLA.
190 YES YES. This is the optimal range for printing with PLA and even some ABS.
210 YES YES. When printing ABS, the most danger comes from off-gassing and nanoparticles of the ABS itsself.
250 YES YES. You should be fine printing PET, etc., in this range.
280 YES Maybe. At this temperature, PTFE off-gassing has been shown to harm pet birds because their cardiovascular system is much more efficient at absorbing toxins than ours.
300 YES Maybe. This is entering the danger zone. PTFE may start to soften and fail physically after some time. Also, the filament you are printing with may be creating off-gassing as well. We recommend using XS series tubing only above this point, and running the printer in a well-ventilated area.
340 Maybe Maybe. At this temperature range, the PTFE will eventually deform physically and may cause clogging. We know some people have had success at these temps but we can't promise it will work for any given set up.
400+ NO NO. At this temperature range, off-gassing dangerous to humans will be created by both the filament and the PTFE tube, and the life of the tube will certainly be diminished. The authors of this paper performed their tests at 460 C

Food Safety

PTFE by itsself is generally considered a food safe polymer. It is commonly used as a non-stick lining on frying pans.

PTFE Tubing, specifically, is often used in medical applications, because it does not react with bodily fluids.

That does not necessarily mean your Bowden tube is food safe, however. It is processed in an industrial facility without the types of cleanliness precautions, etc, that would be necessary to call it "food safe."

In the event, for example, your dog eats a piece of our tubing, we are not aware of anything in our additive blend that is particularly hamful. The bigger risk is the choking hazard. If an animal is unable to bite off the end of a tube, they may be unable to swallow it. Please keep this and all 3D printing products out of reach of small children and pets.

How To    Technical Specifications    Shop Now!