MDF, because it's made of processed wood fibers as panel stock allows for a different construction method. ... MDF will expand and contract but with this 2-piece construction method the doors move as a unit and not as individual pieces of wood. Therefore the paint does not crack or peel at the joints.

Does MDF expand and contract temperature?

MDF, like wood, expands and contracts when there are fluctuations in temperature and humidity. But unlike Wood, MDF does not warp. This is because the board, thanks to its structure, moves as a unit. Even with extreme changes in humidity and temperature, you do not have to worry about any damage to the cabinet doors.

Can MDF expand?

Like all wood based products MDF will expand and contract as humidity change.