Flush Door / Plywood

Door shutters, when tested in accordance with IS 4020 (Part IS), shall be considered to have passed the test if no delamination has occurred in the glue lines in the plywood or if no single delamination of more than SO mm in length and more than 3 mm in depth has occurred in the assembly glue lines between the plywood faces and stile and rail

The door shutter shall be immersed to a minimum depth of 300 mm in water at ambient temperature for 24 hours and then allowed to dry for 24 hours at ambient temperature. This cycle shall be repeated eight times. The door shutter shall be examined for any delamination in the immersed portion of the shutter.

The test shall be carried out on a stout table to which is screwed a wooden batten against which the edge of the test specimen is placed The knife is inserted with its cutting edge parallel to the grain of the outer veneer and worked into, or if possible, along a glue line and the veneer is prised upward.