Filling tires with polyurethane foam (making them puncture-proof)
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- Опубликовано: 26 дек 2022
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You may also want to check the difference between using closed-cell foam instead of open-cell. Open-cell has paths that allow the trapped air to escape. It'd be interesting to see!
there are holes in teh tyres, open cell foam would absorb water every time you go through a puddle and even just soak up surface water when it rains. not very smart.
I would have calculated the foam volume so you dont need relief holes. You know the expansion ratio of the foam. You can measure the volume of the tire. If you calculated the right amount of foam to get 3 times the tire volume, you'd (theoretically) end up with 3 bar in the tire. You wouldnt need the relief holes, and the final pressure would be a lot closer to a normal tire.
Wouldn't you still need some holes to release the air that is in the tyre already? Or does the foam "use up" the air?
the thing is, there isnt only foam in there, air is in it as well, so less foam = more air.
more foam = spillage(if you drilled holes) but also air that can escap from the tire..
what they should have done is spread holes on both sides of the tire, then fill it completely with the foam liquid mixture and run/stay away + let it sit overnight.
the foam itsself once it is hard, als consists of air as well so.. any air that was in the tire still (after the liquid pooring) should be removed through holes.
otherwise if you do poke it with a knife, you hear hissing noise from leftover air and the tire will be less inflated lmao
Nah youd never get it 100%.
Its better to have excess that you can remove later
Yes, there would be a bit of air trapped. Unless the tire is complete shit though it should be rated to handle more than 3 bar. Tires on my light truck right now are rated to 5.5 bar. Plus there's going to be a safety margin on top of the rating. One whole tire volume of trapped air would add 1 bar, but we're not trapping an entire tire volume of air. And the volume of the polyurethane itself displaces some air so that adds some pressure. The heat from the expanding foam would also add some pressure. Overall though, you'd still be well within the bursting pressure of the tire.
@@swimfan1976 You act like thats crazy high, but it's only ~72 psi. You wouldnt usually run the tire that high but it can certainly take it and still have some margin left over
"Lookout! The tire can blow up!"
"Yeah, we better cover it with some thin plastic" 😁
I think that's why vlad laughed amd said yeah that works
I don’t think it was for the explosion but for the foam that was goin to be pressured out the holes
and put 2.5 in the next, run it for another 10 sec
To keep the foam from spraying all over that clean garage
and at least they should wear some eye protection
I would suggest tilting the tyre too, so that foam fills it completely, from the lowest to the highest.
Oh and you can fill the tyre to 3 bar safely, or 300 kpa
but there not using grade A tyres remember there in Russia, 🙂
@@dh2032 Also they are used, beaten and old snow tires, likely made in Russia.
This is a pretty common thing that's done on industrial equipment. A common place you see it is in the tires of skid loaders at scrap yards since tire punctures are common in that sort of environment. Generally makes changing tires a pain (often just have to change the tire and the rim), but better that having to deal with tire punctures everyday.
@Swim Fan Different material but same idea. Lots of people use "window weld" polyurethane to replace car bushings. Depending on the car its actually a slightly stiffer (a slight upgrade) to the factory super soft ones, that tear easily. Some factory bushes are even filled with a gel... those also tear easily.. So easily so that if the tech who installs them does it incorrectly, just letting the car down on its own weight will tear them.
This is common on battlebots too.
And SLOW MOVING, not an automobile traveling at highway speeds, now a danger to you and other drivers.
I did it to the back wheel of my E scooter after getting many flats. Works fine! No more flats.
We have been foam filling tires in the USA for decades. mostly on certain construction equipment, hand carts, and rolling shop tools.
Warehouse forklifts.
There are solid rubber tires also, like for wheel barrels. Just bought one, and it never gets flat. Of course nothing is eternal.
@@Njazmo yes solid rubber tires are the original tires but foam filling is best for certain applications like form riding concrete paving machines for them to be transported but airless tires are becoming more common these days especially on skid steers.
@@Njazmo solid tyres suck for impact absorption. I've ride e-scoters with them which only go slow. High speed would be brutal.
Much stiffer foam in the US and Canada then what they used
Extra bonus to have a hot tire to melt the snow as you drive.
Has Vlad and the crew fixed up a Lada with a complete air ride suspension? That would be a good project.
Instead of basketballs, as was done before, get some real suspension airbags (like the ones for a bus) and rig up an air pump and controls to inflate and deflate the airbags.
I think so....I can't say for sure, but I seem to recall something of the sort.
The "shorty" build had an air suspension, if I'm not mistaken.
I believe they've already done this.
@@SwapBlogRU I found a video of another Lada ( not the shorty) that was given a basketball suspension. Interesting idea but, it didn't last long at all.
I'm thinking of Vlad getting some legitimate air bags off of a bus or some other truck and stuffing them underneath. Rig up an air pump driven by the engine and controlled from inside. The air pump can come from a diesel truck with air brakes. It will already have the pulley, fittings, and mounts.
I'm sure bus air bags will give the best ride for a Lada at a third of the air pressure they normally take. But, Vlad will have valves on the dashboard to control the inflation and deflation of the air bags.
Homie snorted the whole line
I would be more curious what would happen by adding more Schrader valves all around the center of the wheel, then remove all their valve stem cores so that you have no holes in the tire other than the stems. Fill it with the foam thru the bottom valve steam and spin the tire so that the foam centrifuges to the outside of the tire. Let it harden, and then add more foam, and spin it some more. You can then add the valve stem cores back to the tires after it all mostly solidifies with very little air pockets inside. You should be able to then air it up using the Schrader valves and the tire should still be pretty much puncture proof as the foam would act more like stop leak.
Here in Canada you can buy one time foam expander for punctured tires. The can has a nossle that attachs to your tire air valve so you can blow the tire up. This is only meant to get you home or to nearest garage. The stuff seals the hole up to a reasonable size and blows up the tire. These cans oftin come in car emergency kits with other items like booster cables, flashlight, gloves etc..
Just wanted to say thanks for all the crazy stuff you guys have done in 2022. You've certainly made me laugh on a few occasions! Happy N ew Year to you all,all the best for 2023.
You guys are awesome! Thank you for your super fun experiments! I really appreciate you taking the time!
here's a puncture proof idea to try.
at the beginning of Mad Max: Fury Road, you can see that Max filled his tires with straw and then tied them back together using wire. kind of like sutures.
how about giving that a try?
Use gyroscopic forces to spread the liquid while it is setting. Specifically centripetal force like a centrifuge.
Maybe put the Lada on the hoist and use acceleration to spin the wheel while wet. No air pockets and even spreading
You should fill a tire with the yellow urethane expansion foam that comes in aerosol cans and gets hard when it cures you should just pop the valve stem and spray it in and replace the valve stem as soon as the foam starts to come through the hole you'll achieve about 15 psi inside the tire from atmospheric so it should work way better than that soft grey stuff.
I've tried it. The Great Stuff foam doesn't ever expand and set unless it has a low pressure path (with air available) to expand into. I filled a tire using the method you mention (removing valve stem to fill) and several MONTHS later, most of the foam was still liquid inside the tire. Upon cutting the tire open, the liquid foam that had been in there for several months then began expanding and setting. So Great Stuff doesn't work for this purpose. I think the reason it won't set is that this type of foam is a single part, air activated reaction. The professional foam is a two part reaction where the dispensing machine mixes the two parts at the time it is dispensed which starts the reaction. It cures independent of the presence of air.
@@Stupidspencer1have you tried aerating the rim instead of the tire just curious
I think this is an excellent experiment. Who in the automobile operating world has not had a pneumatic tire failure? Just the idea of getting the automobile to a place off the road & change the bad tire, or continue to your destination; Brilliant! Thanks for sharing!
Do the math if it expands 17 times figure out the cubic feet inside the tire and put 1/17 of that number inside the tir with no releif holes
I think you may be looking the wrong direction with harder polyurethane. If you think about the way a tire works normally, air is not hard, it's just pressurized. So maybe try to figure a way to fill the tire through the fill valve? Or design a larger fill valve that could be used. That way the air in the polyurethane won't have a way to escape when driving the car.
The sound deadining foam they are using is much like a foam sponge. Other types of foam like the kind that pool noodles are made of are far less permeable to air and water. Your method of sealing the tire would more or less be just a typical tire with run flat qualities. Now if they were to continue looking to choose the right type of foam and inject it into the wheel while vertically spinning at an optimal speed in several layers of increasingly more dense foam towards the rim, but of course also allowing each layer to fully dry before injecting the next; they would be able to create a badass tire that would out perform all other modern runflats.
Tire innovation is born by garage 54, hooray!
Fill one up entirely with casting (mold) grade silicone
You need to make a special jig for the tire. Take the wheel off the rim. Put it in the jig that will keep the shape as you put the foam into the tire under presser. The most important part is to make sure the tire is balanced. If there is not enough foam in spots the ride will be very bouncy and uncomfortable ride. When driving a car down the road your tire builds up air pressure. You put in 32lbs of air. While driving the car down the highway at 55mph. Your tires build up air pressure in the tire after 20 minutes your tire pressure is about 36 to 38lbs. Where does this air come from? It’s crazy but it your putting foam in the tire you have to count on the build up of air pressure to. Putting holes in the rubber is useless. Put the foam in before you put it back on the rim. Use a cutter and shaper to cut the over flow of foam off before putting the rim back on. Check the balance of the tire. Good balance without any damage to the tire or rim. Give it time to harden and saddle down while spinning the wheel to keep everything in line. Then through the tire on the care and hit it. Since there isn’t know air build up in the tire there isn’t any chance of the tire exploding. The tire will push off the rim and stretch away from the rim not go boom. If pressure was in the tire yes there is a chance but not likely to All because there isn’t enough air only foam that takes up the space where the air is so post to have been. Fire is my only worry. It’s very deadly from the gasses that let off from the foam. Plus how hot it gets too. That’s should be the looked into more as welll. The more heavier the foam the stronger the tire. Just one problem how uncomfortable the ride will be. All these Ideal have been tried before. Just go check out a Goodyear book at the library. Through the years everything has been tried. Good luck at your project.
great experiment!
i know bikes can have puncture proof tires with rubber inlays (solid rubber tube)
but i think if you do this for car tires, they get very heavy.
Yup a mousse is what we call them here USA
They do it on forklifts and construction machines, bulldozers ect
Back in the day, tires used to have inner tubes, wouldn't it be a great come back to fill the inner tube with foam, allow the tube to protect the rim from goo, so when the tread is gone, you only need new tires instead of rims and tires. Perhaps have the instalation rotate on a spindle as it expands, the inner tubes may already have no air in them that needs to be expelled.
Foam may be good for bicycle tire tubes without punch holes. Just a little amount of foam will work for street bikes (never for racing bikes).
Very interesting. I suggest fully seating the tire on the rim, then let the air out. Then drill five or six 12mm-14mm holes in the metal wheel so the foam can be injected into the holes. Inject a bit in one hole only, let it expand just for a minute, then move to the next hole. Also, use trailer tires. They have triple thick sidewalls. Not advised to use trailer tires on steering locations. But on rear 'Load Bearing' locations, yes.
Finally we found something that actually worked! Bravo, market these and sign me up!
I worked in a factory that made and used polyurethanes. The chemicals for foam or solid casting resin are the same only in different ratios to change the urethane chain length. When more than one urethane is used then it is a polyurethane... poly being many. Long chains of urethanes will make a soft material an short chains will be hard. Introducing an accelerator along with the activating catalyst will cause the reaction to happen quickly as well as causing carbon dioxide gasses to become trapped in the polyurethane making it foamy.
***PLEASE use PPE, respirator, nitrile gloves.
Polyurethanes contain and release isocyanate. This chemical is known to cause health problems.
use fence post foam its meant for compressive forces 2 tons per square foot, but it might be a pretty hard tire afterward.
Expanding foam works fine at sealing tires....for small carts, hand trucks, certain small equipment, even some small low speed riding lawn mowers used on flat fields.
I've done this with garden tractor tires for years. You need a denser foam for it to be reliable, otherwise you need to run a modest air pressure as a backup. Doing it at home, it's lots easier to just mount it and roll it on the axle slowly to let the foam 'slush cast', using either off-the-shelf 16lb foam or more rigid 20lb foam with a plasticizer agent mixed in.
you should take some 2k silicone and mix it 50:50 or so with styropor balls for the filling :)
Большое спасибо Владу и команде (и BMI Russian) за отличный контент в 2022 году.
И вам, дорогим зрителям, спасибо за поддержку в этот непростой 2022-й год.
Been doing this for years now and have found out that the inside of the tire needs to be dry and that the high density foam works the best, be sure to start from the tire and work towards the rim, and give it time to expand, remember that when you are done there's no more Air in the tire so you need to get the foam completely around the inside, I've never done it on a highway tire just off road works well, I always Carry a can with me off road.
You guys are on the right path. Wondering what would happen if you put a flat thin piece of metal or vinyl inside around the tire ?
You mean like a steel belt?😄
yes i like that idea like a cast iron ring that fits flat againt the inside of the tire. Like on the inside under the tread. I made this cart and i used bike tire rims with out the rubber on them and it would just glide down the road with out much friction...steel on pavement real slick.
A kevlar belt would be better
Thanks guys, very interesting.
How about another experiment.
Make a single hole in the tread of the tire, do not break the bead, then put the foam in the tire through the hole in the tread while it's standing up. The foam should expand from the bottom up and push out any air through the top.
Thanks again.
I use 2lb Closed Cell running through Glascraft MH2 with 3/16 x 3 in long jet stream tip on Probler 2 gun. (I ONLY FILL OFF ROAD TYPE TIRES NEVER TIRES THAT NEED BALANCING AND ARE FOR HIGHWAY USE) Heaters set at 120 and 125 on hose heat with 1100 psi on gauges. I remove valve core and drill 1/4 in holes in tread and inner side wall. i do not break down the tire as I haven't found it necessary . Amount of holes and amount of foam will vary base on tire size I use the digital counter on machine as opposed to a count up of time... Write down tire size amount of strokes on counter along with your temp and pressure settings. If you get everything dialed in correctly then stick with the formula that works, It should be very consistent with equal size tires.
You guys need to try to do the exact same thing but introduce the foam through the valve stem with already seated tires...vacuum out all air.. x2 your foam in the tire as well to make it more rigid or use something different(hardware store expanding foam??) Spin it on a machine or axle to even the distribution for balance... wonder the results to that..
I think that filling from a valve stem and spinning the tire while the foam expands would take this stuff to the next level honestly.
That seems to be open cell foam. You need closed cell foam.
Excellent. Thank you for sharing this with us.
Awesome video, testing multiple densitys is an excellent idea. Those remind me of drag /funny car tires. Is there a way to test rolling resistance or half a kilometer times / quarter mile times? Maybe using a tire machine to spin can reduce air and holes in rim to vent. Spining faster in theory should move air to center and makes out part denser. A bonus is if you can get the foam to set up while spining the tire should also self balance. And are the tires quieter?
that's absolutely amazing with the polyurethane foam in the tires. I think you should take it to your landing, strip test area and drive it at speed for a while and see if the tires blow up.
I've had a zero turn lawn mower that was constantly losing air out of the smaller front tires. I got sick of dealing with the hassle and took it to a tire and battery shop. Had them fill both front tires with an expanding foam. They're hard as a rock and don't absorb impacts, but I've never had to deal with a leaky wheel again. Don't remember the name of the foam though.
I knew this trick in the late seventies.
It's tough getting your tires to balance, we used a bubble balancer on our cross country race bikes, a car or truck tire is hard to get balanced on a modern tire balancer, a bubble bouncer still works best.
There's a foam fill that's used on some heavy machinery. We owned a skid steer loader that had foam filled tires.
What do they fill tractor tires with when they are foam filled?
Only a boss will promote their merch whilst wearing a north face hoodie
The sound deadining foam they are using is much like a foam sponge. Other types of foam like the kind that pool noodles are made of are far less permeable to air and water. They should continue looking for the right type of foam and inject it into the wheel while vertically spinning at an optimal speed in several layers of increasingly more dense foam towards the rim, but of course also allowing each layer to fully dry before injecting the next; they would be able to create a badass tire that would out perform all other modern runflats.
Get a denser type foam and that would still impact fuel economy because of the weight. What if the tire was sectioned off inside with say cardboard and then each section is filled, also each section has 2 relief holes at each side of the of the tire. One side for filling a smaller hole for pressure relief and air escape.
Fill with silicone via the valve stem at the bottom, have a hole in the top to release air. It'll take days to harden though.
This method is being used in heavy machinery wheels. There using a foam and air together. So when the tire fails it can go on its on feet to the mechanic and the tire wouldnt suffer further damage!
Hello, you need to allow the foam to complete the curing (hardening) process for at least 24 hours before using it. Preferably in a warm environment. And it should lay flat during that time.
I tried filling a wheelbarrow tire with spray foam. The issue I ran across was it would not cure. I even put a couple of good size holes in the sidewalls and it still wouldn't harden. It couldn't cure properly with the absence of air. I cut the tire open after a few days and it was still liquid in the center most parts.
I've worked with PU foams - you can get all sorts of density foams try different foams for improved stiffness
What if you didn't put holes in the tire and just removed the Schrader valve?
Probably better.. or drill another hole for a schrader valve... keep one filling up and the other for fine adjustments to get the pressure right 😁
Foam fill the tire OFF the rim. 1st step: take tire off rim, lubricate the tire bead and rim to make them slippery - take out valve stem. (Do a test: spray 6 inches of foam [inside the tire if you want to conserve foam] and watch it for 2 minutes to see how much it expands, so you can make better judgements). 2nd step: Lay tire flat - without rim. 3rd step: spray 10% foam - aiming to cover some on inside sidewall, some inside tread area. ( remember 10% foam only - let foam set -up a little bit... BUT not much - you want the foam from each step to keep expanding onto the next step) 4th step: turn tire over - repeat step two - 10% more foam. 5th step: add 30% more foam between and above the first two applications. .( My percentages might be wrong ! for you - 10% + 10% + 30% might expand to 110% - LESS - IS MORE You can always put more in , but you'll have a hard time taking some out. 6th step: mount tire on rim. 7th step: rotate the Slippery tire 360 degrees while your spraying the last 30% foam THROUGH the valve stem hole. GET THIS ALL DONE WITHIN 5 - 7 MINUTES. 8th step: place the rim up on a support so nothing touches the tire, so it can evenly expand.
You guys NEED to do this in a "VACUUM" state.
Urethane tires exist, are used in moderately heavy equipment such as scissor lifts and skid-steers, unfortunately they’re only puncture proof to a point, and if installed incorrectly could introduce water damage to the urethane and make the tire near unusable
It would be interesting to see how the high tire temps would affect the foam.
If you had a way to spin the wheel right after the foam is injected to push the foam to the outer edges of the tire so it expands from the outer edges down to the rim and using relief holes in the rim itself...👍👍👍
does this also reduce the noise created from the tire? ev specific tires have a small layer of foam matierial built in to reduce tire noise since there in no engine noise to mask it
What would happen if you got the tire really hot from doing a major burnout ..?..what would hapoen to the foam inside after a burnout ..curiouse ...well i seen a short burnout lol lets see a long one
I have done just that to children's bicycles as they kept popping tyres. Very good. I would love to come to Russia. You people are masters!
I can see the inventors of foam on their first day wanting to fill tires to test what would happen.
maybe u could install a larger valve in the rim to allow the foam to escape instead of drilling holes in tire. another thought just to have fun try filling a tire with foam without drilling holes to see if it will explode . interesting to find out call those tires maypop brand.
I doubt the foam fill would survive a 100km trip. It'll likely overheat from deformation with basically nowhere for heat around the "core" to go and crumble.
Given solid tyres are a thing, how about just filling the tyre entirely with rubber? :P
You need to put enough foam to simulate pressure when filled with air.
I've used some polyurethane window weld to repair some curb rash on my tyres it's held up well so far
Kind of like the different density foam inserts for Radio Control Car Tires.
I wonder if they could make a stiff rubber tape which you wrap around the outside of the tire to provide rigidity, even with no tire pressure.
Fill it with 45 seconds of foam with holes in one side like the passenger rear. Then patch the holes. Then put some air in it a touch and see what the psi is. Try to get it at normal psi and balance it, then do max psi and see the difference and see if it firms the tire up enough to round it out. Then run over a nail. Then you have a real run flat tire
I think he's onto something here. This should be the future of tire fill, it gives good shock absorption. Just balance the tire after fling with foam
How about this experient: fill the tire 1/3 the way - 1/2 way full with the foam and still have the original inner tube. Maybe spray a bead of foam over the side of the inner tube (sidewall protection). That way it will still have normal firmness if inflated. When punctured, it still has the soft but ridable feel as the wheels you did.
Is filling it with foam like this going to have a negative effect on the balance?
Fill with Silicone Caulk? don't know if I've seen that.
Can u get a rube filled with tire on rim and/or double tire the rims.
Maybe try with high density foam. And use tyre tubes. Inject foam from the air valve.
Pls do another one with slightly harder foam
Have you tried a tyre with the expanding water beads?
12:35 do to the fill method and how it sets up. You may need to find another way to make sure the entire tire gets filled with foam. Maybe even completely removing the tire, and filling it, then trimming the foam back to fit a wheel in, that way theres no possible way air is trapped, Just densely expanded foam. Would work wonderful in a pinch, or for offroad use..
like use the older style split rim that could be put back together without much problem after the foam was in the tire
LOL Just a thing: why did you use screw for metal (auto hole drill) instead of the screw for wood (wich have the tip)?
What you need to do is finjd out what the volume is of the tire/ then oyt 1 times less the volumr of foam.. that way you wouldnt need relife holes. and you could also pump air in it. So in essence making it a runflat.
Running deflated tires doesn't increase your traction. It decreases your ground pressure, allowing for better flotation on soft surfaces.
I put 60 psi in a tractor tire to seat the bead.(too dry) Then I read on that tire that I shouldn't do that. You guys could sort this out. People have died from over inflating tires. The split rims are particularly dangerous and should be in a cage when overinflated. The bigger the tire the bigger the boom. Oh the tractor tire I overinflated was 7 ply. Much stronger than many farm tractor tires that may be only 3 ply. I do not go near overinflated tires. I take the valve out and let the pressure down from the compressor end.
To fill the tyre with foam you have got to spray with fine mist of hot water at the same time as the foam or it will not set and expand in Layers that will work 😀
Cool experiment.🙂👍. Why not try stuffing steel wool inside the tyres and then insert the rim inside, instead of the foam?
Polyurethane foam often doesn’t cure very well if you blow it into a closed space, but it’s not really designed for fitting into tyres. Scissor lift wheels are sometimes fitted with some sort of foam but I don’t know what they use.
Also, I want to know how you drove over a bunch of nails and didn’t manage to get a puncture and somehow I get a nail or screw in one of my tyres every week.
Interesting experiment as always
i want to see a long term test of this idea with 4 tires instead of just 2.
Fill silicone rubber inside the tire will work really well and even better....I think u guys should try filling silicone rubber inside the tire
I don't understand how you guys don't know that there's a difference between load-bearing foam and expansion foam
There's a big difference between open-cell foam and closed cell foam I suggest you look it up
Foam fill the tire OFF the rim. 1st step: take tire off rim, lubricate the tire bead and rim to make them slippery - take out valve stem. (Do a test: spray 6 inches of foam [inside the tire if you want to conserve foam] and watch it for 2 minutes to see how much it expands, so you can make better judgements). 2nd step: Lay tire flat - without rim. 3rd step: spray 10% foam - aiming to cover some on inside sidewall, some inside tread area. ( remember 10% foam only - let foam set -up a little bit... BUT not much - you want the foam from each step to keep expanding onto the next step) 4th step: turn tire over - repeat step two - 10% more foam. 5th step: add 30% more foam between and above the first two applications. .( My percentages might be wrong ! for you - 10% + 10% + 30% might expand to 110% - LESS - IS MORE You can always put more in , but you'll have a hard time taking some out. 6th step: mount tire on rim. 7th step: rotate the Slippery tire 360 degrees while your spraying the last 30% foam THROUGH the valve stem hole. GET THIS ALL DONE WITHIN 5 - 7 MINUTES. 8th step: place the rim up on a support so nothing touches the tire, so it can evenly expand.
Soon as I see your face I start to laugh. LOL. You are so funny. ! I have some kind foam in a can in case I get a flat tire just in case just to be safe. Change a tire! No way!!!!
What about putting Orbeez into the tire and then taking the valve out of the stem and filling the tire with water after the tire has been reseated?
I remember those tires, Good Year Nordic, from around 2009 year, I had those tires before.
You should fill some tires with FlexSeal Rubber
You should build those multidirectional Mecanum wheels next and connect multiple transmission Together to control the car.
very good idea ! well done fundamentally, need to be practical finally
There were some concern about overfilling and making the tire explode. How much pressure can the foam produce? I mean it surely can't expand 17 times (or what was said in the video) regardless of how tough container it is poured in to.
Well, that is pretty much exactly the concept behind a bomb though. You build pressure into a vessel until it bursts. if that foam is going to expand 17 times it is going to go ahead and expand until the vessel fails...
Hot, exothermic reaction means rapid gas generation and expansion, the foam expands with the gas and eventually hardens. If the reaction rate calculations were spot on, you could fill them with less concern, but I wouldn’t trust a crusty old junk yard tire, I suspect that’s what they are more likely running away from.
@@gmailisaretard well, that depends on the toughness of the vessel of course which was my question: "how much pressure can it produce if put in a rock solid container that is more than 17 times smaller than the amount of foam (when expanded) poured in?"
Fill with fixa flat or slime mixed with foam beads.
Maybe try oobleck in the tyre it starts soft and once smacked or hit with it is hard