I believe you are talking about Canson Museum Canvas 440g (100% cotton). I used it extensively on a Z3200ps with excellent results, but, as far as I know it is no longer produced, same with their poly-cotton Artist Canvas. The new product that was introduced to replace both is named "Museum Art Canvas 340g" and is a poly-cotton blend inferior to both previous canvases.
If you are buying the old Museum Canvas 440g I think you will be pleased, but it must be a clearance of stock and you probably won't find it again.