What is the minimum page count for Perfect Binding?

The minimum page count is generally 48 inside pages. However, the thickness of the paper does have an impact. The true minimum is not a certain number of pages but the overall thickness of the finished piece. Perfect binding requires the book to be a minimum of .125" thick otherwise the pages might not glue properly and could fall out. Therefore if a thicker paper is chosen, 44 or 40 pages might be possible, whereas if a thinner paper is desired, 52 or 56 pages might be needed to get up to the required thickness.