MDF for shelves?

[CortinaV8]

I'm creating some shelves in an alcove and was thinking about using MDF, however, will MDF be likely to sag overtime?

Span will be about 120cm, I was intending to use a baton across the rear and a wedge shaped baton at the sides.

Does anyone forsee any problems? Would mainly be storing my partners teaching files.

 

[foxhole]

Use 24 or 32mm mdf and it should not bow and will require no baton.
decorate to match wall?

 

[Chukka63]

beware of mdf shelves,i did some a few years back,put loads of supports in and it still sagged.use ply and nose the front edge.

 

[freddiemercurystwin]

http://www.woodbin.com/calcs/sagulator.htm