Nailing and stapling
Whilst the highest withdrawal strengths are achieved by screwing into MDF, satisfactory performance can be obtained by stapling. Typical applications include the securing of parts of a joint while the adhesive sets, the attachment of fabrics to MDF upholstery frames , and the fixing of decorative trim to MDF panels.
Stapling into the surface.
The holding power of staples inserted into the surface of MDF is good. For best results they should not be inserted closer than 12 mm from the edges and 25 mm from the corners.
Stapling into the edges.
The holding power of staples in the edges of MDF is more limited and this method of fixing is recommended only for applications involving light loads.
Resin coated staples may be used with advantage. Close spacing of staples is acceptable but the staple legs should be aligned at an angle of 15° to 30° to the plane of the board to increase withdrawal strength and reduce the risk of core delamination.
Staples should not be inserted closer than 70 mm to the corners.
Where other methods of fixing are not practicable, small diameter nails can be used successfully provided they are not closer than 70 mm to a corner when inserted into board edges. They should be spaced at least 150 mm apart to r educe the risk of core delamaination. Improved holding power in the edges of MDF can be achieved by using ring shank nails and inserting them at a small angle to the plane of the board.