Casting Polyurethane: Resin Fundamentals

[@jakekooser]

I love the Mr. Rogers intro!

[@EricStrebel]

Thanks

[@johnkelley9877]

These casting tutorials are great! I do not have a vacuum or a pressure pot but I should get one. All of my castings are simply poured and while it works it still leaves a lot to be desired. Thanks for sharing this series.

[@mlune666]

I love the Motorhead shirt and Mr Rogers combo

[@RockerGaming]

Keep the molding and casting coming! Great stuff!

[@EricStrebel]

Thanks! Will do!

[@markkoons7488]

Thanks. Don't have a purpose but it's nice to know where the information is once an application arises.

[@donnakutia9623]

This video answered all my questions.. thank you.

[@mikemierspadios7036]

Thank you 💚💚. Ur videos are much appreciated.

[@CorvusSapien]

Awesome video! Thank you very much.

[@adrianharrison5208]

You make it look so easy, I am hoping to get into this casting this year

[@cheungnatasha3076]

So glad to see you were happy!😃

[@gokhanyuksel2901]

Sizi tebrik ederim bilginizle aydınlatıyosunuz saygılar sevgiler

[@digitalAuge]

Thanks thats help me a lot with the coloring methods 👍

[@mkjb8331]

Wonderful Teacher!

[@OKeefeist]

amazing, just what i needed.

[@garagemonkeysan]

Great video on resin tinting and coloring. I never understood why Mr. Rodgers changed shoes, slippas would have made more sense. : ) Mahalo for sharing!

[@EricStrebel]

Good question!

[@bigdaddy7670]

Excellent video's please keep them coming. Please explain more about your "Yoda" topper. I just bought the BVV carbon filter and t works great.

[@vibrion121]

Simply addictive to view! Good memories come back! For what kind of resins do you use pressure+heat?

[@EricStrebel]

He can be used anytime for any resin to speed up curing pressure ensures bubble free, mainly for clear. My pressure is also good when it's humid outside to prevent bubbles from moisture

[@carlfogarthy6508]

Grandioso!

[@sentientbean1]

Onya Eric. Wish you were my neighbour. I'd be hanging out in your shed as much as reasonable 😄😝🤓😎👍

[@petesandov3722]

Hello Eric, I'm an industrial designer, just graduated & I have my first client. My client is looking for me to produce a HiFi prototype for a light sensitive technology. My question are: 1. what would be the ideal polyurethane or material I should use to create a very clear, non distorting or refractive molded piece? 2. Also are these hard pieces sand-able? 3. Finally, is it possible to have one of these casted parts be ultra clear on 1 side and slowly gradient out to a frosted look? Can this pieces be sand blasted to achieve frosted look? Thank you, just found your channel - great info!

[@EricStrebel]

Watch this video, it should answer some of your questions. kzbin.info/www/bejne/gaGViqKmnLN_kMU If you are going to resin cast your parts, then contact the resin MFG of your choice for the correct resins. I suggest BJB ent. or Rampf. Yes, PU is very sandable. Good luck!

[@seanfan84]

thanks for sharing

[@EricStrebel]

Your welcome

[@keal.vietnam]

your video alway perfect and awesome , i love it !

[@UnvarnishedTarnished]

Great video per usual Eric! I find that alcohol inks work in place of resin dye for translucent epoxy or polyurethane resin.

[@barrybilt]

love the videos. although this one doesn't have the links to the equipment. especially the right heated pressure pot, and the bottom large one. i was going to purchase

[@danmottram7098]

Can the pressure pot and vacuum tank be the same vessel, sometimes attached to an air compressor and sometimes a vacuum pump? Is the primary difference the clear top on the vacuum tank to allow you to see the bubbles?

[@EricStrebel]

I guess, you would need a special device to keep the lid on for the pressure

[@koopdi]

Can the pressure pot be used with very soft - .e.g. 20A - transparent PU resin? I've heard that the bubbles can reappear when the pressure is released.

[@EricStrebel]

Testing would be required, they certainly can appear with soft materials.

[@dark96744]

How well do opaque resins take Mica powders? will i need the same amount as with a clear or will i need to add extra?

[@EricStrebel]

Not great, you will get some effect in opaque, but you need a lot of mica for that

[@janpucnik142]

Thank you. 😎👍

[@TrenDSolutions]

From which brand is the red dye in the video? How is it called this type of dye pigment?

[@jaspercoutu489]

Can you make a detailed video on your vacuum chamber setup!?

[@bounty157]

Very interesting ! Love it

[@EricStrebel]

Glad you enjoyed it!

[@bounty157]

@@EricStrebel Have you ever experienced issues with an over-heating resin when the layer is too thick ?

[@EricStrebel]

No

[@wok1opopo1]

nice work dose it smell like regular polister

[@EricStrebel]

No

[@oliverioyg]

Great content! Could it be possible to have a video on small parts molding and casting?

[@EricStrebel]

Maybe....stay tuned 😉

[@TheManeliss]

Hi! I work in a foundry (cast iron). I use daily PU resin. For repairs or little molds. Do you use mineral filler like me?

[@EricStrebel]

Never heard of it what does it do?

[@TheManeliss]

@@EricStrebelFor PU 2 solutions, pure or charged. A filler is made from mineral... Or a mix from it with other. Pure, your PU is full liquid but have dimensions problems after hardening. When i create a fine thickness mould without filler it make fine little cracks after 1 week. With a filler, it's less liquid, but little shrinking. A filler cost half of resin... So it save money. Most common filler is marble powder. If i need strong mechanical properties it's an aluminium powder mix. I can give you a link and references to you. Prices are not hide. It's only for european professionnals. But you can better understand!

[@irishwristwatch7544]

Hey Eric, is it possible to use a resin 3D print directly as a mold for PU(70)? Do you think it could work if enough mold release is used? Thank you in advance :)

[@EricStrebel]

Yes

[@georgekassabian5214]

What type of PU is it ?? in order to buy in big drums, I like to know the company who is preparing, like to know the time rise, the expansion ....etc.

[@TailEndCustoms]

Very good info👌

[@EricStrebel]

Glad you liked it

[@marcelkrause3589]

Nice video! A lot to learn for a beginner. One question: is there anything that speaks against using that method for producing a small motorcycle fairing part?

[@EricStrebel]

No, I don't think so

[@marcelkrause3589]

@@EricStrebel thanks Eric

[@divertechnology]

i love the real stuff - from real doers

[@TheGnthreman]

Try making a batch that is a little thicker and mix them into one

[@balkntv]

I have a question. I use 60A shore polyurethane resin vytaflex 60 and i vacuum all the bubbles in my pouring container but when i pour it into my mold i still get bunch of bubbles. Do you think I should maybe dry out my mold or is there a pouring technique? Thank you.

[@EricStrebel]

Pouring creates bubbles, and urethanes are moisture sensitive, you can heat the molds, but probably best to get a pressure pot

[@balkntv]

@@EricStrebel what about silicone resin? I have been wanting to switch to that. Will pouring silicone rubber resin create bubbles? Appreciate the help.

[@EricStrebel]

Some, yes. Use vibration to remove the bubbles from the silicone after you pour

[@fcesur77]

What are the advantages of using a vacuum chamber? Does it decrease amount of released carbon dioxide through the polymerization reaction?

[@EricStrebel]

Removing air from the silicone is the main purpose to avoid trapped air bubbles in the silicone to get better reproduction and surface quality.

[@joec732]

Hi neighbor! Nice video. Interested casting polyurethane with a hole that I can tap with a self-tapping screw. Can polyurethane be tapped like that? Also wondering if threads can be cast in when using a silicone mold.

[@EricStrebel]

yes, it can be drilled and tapped

[@joec732]

@@EricStrebel Thanks!

[@1337FLINT.]

Hello, i want to make rubber tire for hot wheels, i make the master mold with 3d print sla, which means the material is solid. My question is should i recast it with polyurethane resin or silicone resin? thanks, sorry for this long question

[@EricStrebel]

Depends on the properties you want, but probably PU into a silicone mold

[@1337FLINT.]

@@EricStrebel I need to make the tire rubbery feel, so i need to recast it with pu silicone?, that is hard isn't it? is that okay to pour silicone resin into PU? it will come out easily from the mold? sorry for asking too much, i have zero experience about this

[@EricStrebel]

Pu is polyurethane....comes in different durometers, check with the mfg for the type you want for your project. Good luck

[@1337FLINT.]

@@EricStrebel Thanks, soon i'll find more info about it

[@loan20000]

Hi, I am trying to dye my white polyurethane resin. Do you have any suggestions on which dye or other material might get me a rich opaque black? Thank you.

[@EricStrebel]

You need a colorant and not a dye to get the most opacity

[@MyllerSWE]

*****! Would the "brown" one be polished into a copper sheen or does that need more copper powder per resin and maby doing a slush cast?

[@EricStrebel]

That's a good question, I don't know but I tend to think not.

[@arinarici]

hi eric , is polyurethane resin dangerous ? , can i cast in my bathroom (With mask ofcourse)

[@EricStrebel]

It has a low odor, you should be fine with a mask. Open the window and stay safe. Good luck

[@tonylaforest2725]

Hi Eric, love your KZbin vid's Watch em all the time, well i'm getting to end of your list so i'm looking forward to some new ones. Here's a question for you or maybe even a new video for you to do. Here we go... so my wife bought these silicon ice cube trays, they are awesome, ice comes out so easily without busting up the counter trying to get the ice out. Problem is she has no recollection where she bought them or were they a gift or something. So I have the mold, the existing ice cube tray, just wondering how you would go about replicating them and what products you'd use. I think my biggest concern is that whatever I make them with has to be food safe so I don't poison someone, ewww... now there's a thought eh lol! Anyhow, I look forward to hearing from you or maybe watching your ice cube tray video... hey I hope to get credit for the inspiration. cheers and thanks for the interesting and fun material you put out there, Tony L (Ottawa, Ontario)

[@EricStrebel]

Find a food safe silicone...made a vid about that already kzbin.info/www/bejne/d5qzfoh-hayKqJY

[@lukasmercer9681]

what kind of dye did you use and is the Vacuum necessary?

[@EricStrebel]

You need an alcohol-based dye and vacuum is not necessary but will give you much better results

[@escrabio123]

Im trying to make fake bones with polyurethane systems but is quite hard to get them done well

[@SantaDragon]

Interesting. I would have guessed to use vacuum to pull out every bubble, instead preassure it.

[@EricStrebel]

You really need both to get a good part.

[@deansnyder]

Do you also pressure pot your silicone molds? Don’t they distort under pressure if not?

[@EricStrebel]

Silicone is not cured under pressure

[@ranajitmistry1979]

How does a polyurethane resin cast part behave at high temperature above Tg? Will it burn or porus? Thanks in advance for your answer.

[@EricStrebel]

It will get soft, check the specs from the manufacturer before us use it, to find the correct resin for your application

[@barnhartequipmentbrentbarn5662]

can you cast in specific SHORES ?

[@EricStrebel]

Yes

[@26mridul]

Hello Mr Eric, can you twist and break some parts so we can get an idea of their strength? I'm trying to use polyurethane castings for a joystick for a short production run and if successful I'll get them injection molded. Would be nice to see a comparison.

[@EricStrebel]

resins come in many many hardnesses, use the one that suits your need, shore 80 is a good place to start it is very similar to an ABS lego, best of luck with your project

[@romansonsmart3366]

How long does it take polyurethane resin to dry?

[@EricStrebel]

Actually it cures, and it depends on the resin you choose

[@JoggingFoxProductions]

Is it possible; if I were to make a thin cast, to cut a few sections in the middle of it

[@EricStrebel]

Anything is possible you would have to cut the mold from the inside so you could remove your part. If I understand correctly what you're trying to do

[@JoggingFoxProductions]

@@EricStrebel I was talking about the cast made from polyurethane resin, would I be able to cut it using a crafting knife?

[@EricStrebel]

Should work

[@JoggingFoxProductions]

@@EricStrebel Alright cool, can I spray said cast with Primer Sorry if this seems like a stupid question, I'm a first timer, I need to make sure that after casting it, I can Primer it and then paint it my desired colours

[@EricStrebel]

Yes, The cast part can be primed and painted should not be an issue

[@Inkulabi]

🙌🥇

[@WhenDoesTheVideoActuallyStart]

Don't you need to sand cold cast parts to get the metallic look?

[@WalkingSideways]

That's what I was thinking, saw a few videos from manufacturers and they all sand with wire wool to reveal the metallic effect.

[@EricStrebel]

You can sand it a bit if you want, try and see how it goes

[@Vizenzo187]

Nice flag! Greetz from Amsterdam 😉

[@neatpolygons8500]

the introduction is wholesome

[@WazMan1234]

can you reuse syringes, or do you need a new one for each pour ?

[@EricStrebel]

You can reuse them multiple times

[@WazMan1234]

@@EricStrebel are you cleaning/flushing them out immediately after use? Which solvent do you use ?

[@EricStrebel]

Denatured alcohol

[@CNC860]

MotorHead = Subscribed!

[@EricStrebel]

Awesome 🤘

[@BTech5]

How does the polyurethane hold up to UV light

[@EricStrebel]

Depends if you get UV stable resin or not

[@maedeer5190]

whats the flexible one called

[@AntiThesis10125]

Epoxy or polyurethane? What is the composition? My PU has a 300s potlife so no way I can degass it

[@EricStrebel]

use a different material with suitable working times.

[@catkudaterbang7277]

yo, motorhead sticker!

[@negotiableaffections]

I wish you were my neighbour, but i wouldn't just be yours...I'd also be your workshop infestation too! Actually, you've proved beyong doubt that home casting is a lost cause without a good set-up. [pennies are being saved!]

[@EricStrebel]

Good equipment is valuable for this process to be successful

[@godurmumishot]

what if I donot have a pressure pot?

[@EricStrebel]

Vibration or different resin

[@godurmumishot]

@@EricStrebel thank you.

[@Kianarevision]

\Awesome upload! I hope you'd enjoy my videos too. Keep up with the fantastic work! 💛❤️