Which construction board warps the least, moves the least?

[fender stratocaster]

I was thinking of taking a board, maybe MDF, and using it as a ping pong table on one side, and then flipping it over to have a race track on the other side, with the race track screwed in. And when it's not in use, you can just stand the board up against a wall. What kind of board is best for this? It shouldn't warp, and it has to be fairly large, and preferably not too heavy... the weight isn't super important, but

 

[xibeca]

I would suggest a flap disc, but all discs can warp if you lean them against a wall.

 

[Bart]

I would bet on a torsion box. Google it. It can be built with relatively lightweight materials. Paint it and you have a torsionally rigid construction that doesn't warp easily. The weight might be an issue despite lightweight materials, but I would go for it anyway.

 

[f91jsw]

Light + dimensionally stable, then the best would probably be some form of sandwich, e.g., 3 mm plywood glued on each side of a light core material, like XPS or divinycell.

 

[ToRy]

If you're going to use it as a ping pong table, it might be good to consider how the ball will bounce on different materials. I have no idea which would be best, but it just occurred to me that it might be good to think about it...

Spontaneously, it feels like mdf might respond better than, for example, plywood, but it's just something I imagine...

 

[Oldboy]

Serious ping pong tables are quite heavy/massive/stiff/smooth precisely for the ball's behavior...

 

[KnockOnWood]

I also do not believe in building a ping pong table out of any light material.

 

[Rabbithole]

A ping pong table maybe? And possibly glue a board for the car track underneath?

 

[KnockOnWood]

I would suggest a flap disc but all discs can warp if you lean them against a wall.

Regarding the board, it's probably not so easy due to its size. A proper ping pong table should be 274 x 152.5 cm.
Where do you find such large boards?

Maybe a ping pong table? And possibly glue a board for the slot car track underneath?

Seems to be the most reasonable suggestion so far.

Otherwise: A "regular" ping pong table, which can be folded "to a vertical position" (or left standing with the net removed) and the slot car track on a board that can be hoisted up to the ceiling to get it out of the way.