Have a friend who wants to put his kid’s name and player number on his shin guards.
The guards say they are 69% K-Resin and 31% EVA. It’s definitely a hard shell. They want to mark on the orange material.
EVA is Ethylene-vinyl acetate and appears to be ok to cut or engrave but I don’t know what K-Resin is made of. I find “SBC” but that’s where I get lost. What is this stuff?
Secondly, if I engrave/score this, what will we even be able to see? Just light cuts in the plastic? What would you fill in score lines with so you can read the numbers? Clearly they’ve done something here with the Nike Swoosh.
That statement seems to contradict every discussion I have read on the topic of distinguishing vinyl in itself and PVC with the chlorine added.
Chlorine makes hydrochloric acid which eats up the components of the Glowforge and is fairly toxic to breathe. Vinyl is a combustion hazard and often doesn’t laser well but there has been a consensus that EVA is fine.
Help me understand why you think that vinyl products are all unsuitable.
So you wouldn’t use your laser to cut any paper glued together with that ubiquitous white glue, PVA ?
After all, that’s polyvinylacetate, and, heaven forfend, it might even have polyvinylaclohol in it.
Truly said that ‘a little knowledge is a dangerous thing’
I also sell mounts for diode lasers on a cnc machine. I’ve been a part of a few laser groups to.
Again, all I can do is give the warning, pass on the information from my research, and have my own opinions. My advice and opinion will always be DO NOT LASER CUT VINYL. that’s all I’ll say on the subject. No angst, just my advice.
Phil, while a fountain of useful knowledge on the inventibles forum is mistaken on this issue. The reason to avoid burning vinyl is that we’ve come to use it typically to mean PVC. After burning, chlorine makes HCl when mixed with the water vapor in the air. It’s highly corrosive.
EVA on the other hand does not make a corrosive gas in large quantities like PVC. It does make some of the same dangerous substances that all of the things we burn do (wood, acrylic) since it is made out of similar stuff.
And by similar stuff, I mean carbon molecules which vary quite a bit. However, when burnt, you get carbon monoxide, hydrogen cyanide (very dangerous, but in very small quantities), and other organic compounds you don’t really want to breathe in quantity. So vent well to the outside.
Yes, vinyl often refers to PVC which is why you should avoid. But that’s English common usage. Vinyl in chemistry does not necessarily mean PVC. And the vinyl in Ethylene Vinyl Alcohol is not PVC and is fine to laser.
You are correct. I’ve been lasering for years and teach laser operations. But I’m not about to argue with experts on the internet or with people’s varying tolerances for risk. There are other “non-harmful to the machine” compounds as you’ve noted that are the result of lasering but are not especially healthy for people which is why we vent outside. Some folks feel that even a trace of cyanide or formaldehyde or a host of other combustion byproducts are too much exposure and won’t laser them. That’s ok. But that should be a personal decision of acceptable risk vs a blanket statement of suitability.
That’s coming from the viewpoint of someone who has to breathe exhaust-laden city air and also loves the taste of a charcoal grilled steak so my tolerance for bad chemicals may not be normal