That's not strictly true, John. Particleboard (or chipboard as we call it in the UK) is somewhere between MDF and OSB in structure. We have Germany during WWII to thank for it. Fibreboard is available as LDF, MDF and HDF low, medium and high density fibreboard) - the difference being in the amount of pressure used to produce it and the resulting material density. Hardboard is nearer to HDF than MDF with a much higher density and was first produced in quantity in the early 1920s. The oil tempered version (often sold as Masonite) was designed to be used as siding or cladding in cheap/temporary buildings as can withstand a moderate amount of weathering (and if you've ever been to Jaywick in Essex you'll have seen it because half the town - much thrown up in the 1930s - was clad with it at one time). So it's potentially a lot older than you'd think. Masonite really fell out if favour in the 1950s and 60s when we could afford better material to clad our sheds...
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