In the US, what do you call the board or panel used as bulletin boards? Answered
I'm thinking of the kind that is very easy to push thumb tacks into. It has almost no structural integrity - very easy to break corners off. It's more of something to go over a wall to push pins into. It's not a foam product - definitely wood particles. What I've seen and used in the past was primed on one side. It's similar to what ceiling tiles are made of - but 4x8 and maybe 3/4 inch thick.