What is MDF?

MDF is Medium Density Fiberboard, which is composed of sawdust, and a specially formulated resin (glue) mixed together. This product is then compressed in several stages, thus giving a finished product. MDF has become very popular in the trim carpentry, furniture, and kitchen industries for it’s uniform surface, machinability and ease and quality of finishing.

What is FJ Pine or Poplar?

Finger Joint pine or poplar is lumber that has the knots, raised grain and defects removed and reassembled into blanks.

Finger jointed products are made from joining interlocking smooth, defect free, short lengths of wood together. By using an edge glue process, boards can be made as wide or as long as required. Typical lengths are 8‘ and 16’.

Finger Joint Mouldings offer many advantages over solid wood or even MDF. Compared to solid wood, finger joint mouldings make better use of harvested trees, are more dimensionally stable and less likely to warp, cup, or spilt. Unlike solid wood, finger-joint mouldings are not suitable for staining but great for painting. Although MDF has a very hard, impact-resistant flat surface, milled chairails and baseboards are more prone to swelling from moisture and may shear after impact. Finger Joint moulding profiles are sharper than MDF.

Advantages and disadvantages of Wood products:

  Finger Joint Pine Poplar MDF
Straightness Very good Good Excellent
Stability Very good Very good Very good
Warping Very good Good None
Paint ability Very good Excellent Excellent
Bleed through High NA NA
Finger Joint Telescoping High NA NA
Lengths 8-16’ Random 8-16’
Weight Low Medium Heavy
Surface hardness Soft Hard Hard
Edge nailing Excellent Excellent Very poor
Detail of Profile Sharp Sharp Medium Sharp
Susceptibility to moisture Good Excellent Poor

Foamed polyurethane mouldings?

Polyurethane foam refers to a number of different types of foam consisting of polymers made of molecular chains bound together by urethane links. It can be flexible or rigid, but has a low density. The more rigid variety of foamed polyurethane is used for thermal insulation and mouldings. They are relatively stable once they are installed, but they are not resilient to impacts and are more difficult to blend at the joints due to their open cell structure.