These fluted plastic sheets are intended for slot-in frames. Plastic Slim frames and Woodline frames are supplied with Correx backing sheets. You only need purchase these as spares or replacements if required. The 3mm thick Correx or Corrieboard is quite light duty as it is only utilised as a stiffener inside a top entry frame.
- 3mm backing boards made of twin-wall polypropylene structured sheet - commonly known as Correx.
- Sold in packs of 10 sheets as a replacement insert for slot-in poster frames.
