My understanding is it doesn't offgas unless you burn it. I have not confirmed that, if you find out something else, I'd like to know.

HDPE stands for High Density Polyethylene. When heated strongly it breaks down into high molecular mass hydrocarbons which are similar to hydrocarbons present in wax. It's completely harmless.

No.

I'm sure you can patch them with some of this stuff melted down.

Hi, don't know if you will get this as the thread is old. Many videos on HDPE, but only one mentioned that some samples seemed to 'flow' better than others. The 'non-flow' type included milk bottles, the very thing that most people start with !! Your info suggests exactly that - milk bottles are blow-moulded and lack flow agents. So we need to source injection moulded samples. Thanks for that very useful tip.

Thanks for this tidbit. Really helpful. I wonder what a hybrid recycled hdpe block would be like? One that is say, sandwiched with alternating blow molded and injected molded types. I bet it would be super strong and flexible. Do you know if the layers would bond well? I'll have to try it sometime.

@@thadeousbella4107 have seen a video here of somebody doing a mallet with 2 different colors of plastic (white and gray) and twisted it on a way to get a damascus steel look on the hpde mallet.

Yes, I rather think the temperature is a tad low. In the UK we usually use centigrade and the target is 180 deg.

Good stuff - thank you!

K Hal : Free is better. There's to much that is wasted that goes in landfills.😉

Of course there are other ways, this was just a demonstration of working with HPDE. OK?

Nowhere near as effective or strong as melting it.

When he squeezed the plastic through holes in the heat sink nothing was going to fall off then. I'm impressed he got it off. He must have took it apart before the HDPE fully cooled.

Larry Lund Actually those broke off right away when I pried on it with a hammer. They are pretty small holes, was never worried about that. Where it overlaped around the edges was where the issue came into play.

1D10CRACY HDPE is some tough stuff. At least blow molded HDPE is. That injection molded bucket plastic is more flexible. I don't melt injection molded HDPE anymore as I like the properties of blow molded better. Blow molded HDPE is harder, and slicker.

1D10CRACY

Just so you know: there IS a limit to home many times you can melt and reform most plastics. Without refreshing my memory via google, I seem to recall it is about 6 times for most plastics. The heating and cooling changes the structure of the plastic to the point it loses it's structure. I know some become quite brittle.

Scott West Years ago,they had a kit or iron with the proper texture so you could match the texture of whatever it is you were patching. The stuff came in a color matched tube,you squeezed out a bit into the hole then layed the pattern over the stuff and used an iron or pressure,I forget which. It wasnt perfect but worked. I used it once a very long time ago. It may have been a vynal patch kit for seats too,I just dont remember thst part of it. I do know I used it on my dash and it worked!

I remember that stuff, worked great. You're right though, it was a liquid vinyl and came in several colors and you mixed it up to get whatever color you needed.

Cheryl Olsen I

Since it doesn't liquify when melted, make sure your mold allows you to press the viscous plastic into all spaces in the mold and avoid undercuts unless they also have sprue holes for trapped air to escape through.

Coming in 2024.

@@onjofilms 😹😹

Smells like melted wax.

Well, he DID use a $5.00 bucket to make a $2.00 part. Not to mention the cost of the electricity to get it to that point hehe I discovered this too while trying to use melted soda cans to salvage the aluminum: I found I was using $10.00 worth of charcoal briquettes to get $5.00 worth of Aluminum. BTW: you're NOT paying a lot for cheaply manufactured goods. You're paying market price. Just remember: the mold to make the pill bottle in his last video probably cost $80,000.00 to make. So not counting the labour, energy, machine, etc, it would cost $1.00 per bottle for 80,000 bottles.

@@muskokamike127 ....but what if he got the $5 bucket for free?

@@VegasRT500 then that's good......I actually started scrounging around for HDPE to make stuff out of, the only thing I found was a detergent bottle and a couple of bleach bottles in my place.

@@muskokamike127 that's misleading dude, yes when you do small project you kinda defeat the purpose of it unless the part you're making can't be found on the market, but if you going to make it a business then you'll not melt 5$ and expect good ROI... there is a bep that you should surpass that most business rely on and use it as a refrence and that's why sometimes you hear a manufacturer needs more time to make something routinely easy for them, that's because they keep stacking offers to make it profitable the more you invest = the more you save = the more you profit. that's why most of the times hand made things are more expensive but more durable.

+kombiphotog Never got to making one, maybe another time.

That better be the next video! Lol

The saw blade actually did a Surprisengly neat job. I did flash it with some heat with a propane torch to polish it off.

sprinks sprinkks Maybe he did it when she was out. Haha

Or he's married to someone who is as much of a science & engineering geek as he is.

0

+Clarence Pease Yes, I follow his channel too!

1D10CRACY

1D10CRACY could you do the same thing to make the balloon part of the world war 1 bomber please

Its a Pebble Time. amzn.to/2yjHvg0 They actually got purchased by Fit Bit last year.

1D10CRACY Thanks!...

350F

Ahh,... might want to be clearer in future, most of the world is metric, so anyone copying this activity may be using an oven set a lot hotter, risking their safety.

+InsideOfMyOwnMind My guess is it will burn before it becomes pourable.

1D10CRACY Yes, this is where a good grasp of polymer science could come in. There may be an additive that would make it less viscous at temp.

175 degrees is a good mix between pliable or viscous enough to work with, and lowest release of gaseous chemicals from plastic. FYI, milk bottles are a common source of this plastic.

InsideOfMyOwnMind If you fill it with vegetable oil before puting it inside oven you get what you want then you need this steel syringe to suck liquide plastic n inject it to your two half mold

Can you recommend an adhesive for such a task? HDPE is impossible to bond

Hmm, seems like it is ABS plastic instead. But when I saw it before they used milk jugs.

+Manga Lover Sometimes I make my own special equipment​. LOL

1D10CRACY that's awesome and thanks for replying I love making things so I wanted to try my hand at something new

Manga Lover I plan on making a modeling clay model, and pouring plaster of Paris over it. Let it set up, and dig out the clay. And then sand the inside of the plaster mold. And then completely dry out the mold by putting it in a 200 ° F oven for a day. And then preheat the mold with the hdpe, and then press the plastic into the mold... That should work.....