Car Tyres - Polystyrene Versus Air.

[squidgelet10]

Greetings each.
I expect this question gets asked regularly:
In UK it is legal to use injectable polystyrene foam to keep a punctured tyre on the road without, it seems, any noticeable difference than when inflated with air.
If this stuff is so good then why aren't all new cars supplied with this as standard?
It would save a fortune in puncture repairs etc and, in my opinion, reduce accidents caused by blow-outs etc and also maintain correct pressure for general driving.
Anybody know why this ain't the case then, pretty-please?
Be good!
Cheers.

[Count-A-Strong]

It's only ontended as a temporary measure to get you to the garage safely, not as a permenant method of inflation.

[joko]

i think hes asking why couldnt it be though...C-A-S...

[AlBags]

Because due to heat and humidity inside tyres, the liquid nature eventually dries out and turns into balls of material in the tyre.
Wheel balance may also be affected.
They don't stop blow outs.
A friend was involved in developing Revolution 2000, with polymer granules in a liquid. Even had it ballistic tested. Works well to a degree .. but time is the problem due to above reasons.

[Hopkirk]

Pity they can't make tyres out of the stuff that Clarks use for the soles of some of their shoes. Hard but a little squidgy.

[AlBags]

Crepe tyres ... lol