VIR MDF is a homogeneous wood fiber Material ideally suited to modern machine tooling.
VIR MDF can be worked easily with all conventional woodworking machines. It saws cleanly and drills easily. It also shapes and routs exceptionally well, without splintering or chipping. VIR MDF is equally suited for use with most hand tools.
Sanding after molding or routing produces a much smoother finish. The molded edges can be sanded with any number of different profile sanders. Various polyurethane based abrasive wheels are available to fit to spindle molders or in line with a double end tenoner. These wheels can be shaped to the cutter profile using an abrasive paper glued to the desired edge profile 180/240 grit is usually used for finish sanding with finer grades available.
The crafts man can also work on VIR MDF with standard hand tools, which makes it ideal for intricate design. For best results blades and cutters should be sharp at all the times.
The internal bond strength of VIR MDF gives substantially better screw holding over other types of panel product.
Type of screw
Most types of screw can be used. Best results are obtained with fully thread screws. A high overall diameter to core ratio is desirable.
Due to their 100% natural composition and to their untreated surfaces, Green Blade sheets evolve a little more than laminates, or traditional non-woven papers. Thus before their use, they must be perfectly conditioned. Best conditioning consists in storing supports and sheets for 8 to 10 days, in a room in which the atmosphere is as close as possible to that of the buildings where the sheets will be assembled or worked with. Conditions will need to be within the following ranges:
Temperature of 18A� to 25A� C.
Relative humidity: 50 – 60%.
The use of a Green Blade sheet too wet or too dry risks product deformations, cracking from shrinkage or blisters in the event of veneering. Generally, it is preferable to store sheets in a dry environment rather than an environment that is too humid.
PHYSICAL AND MECHANICAL PROPERTIES
|Properties||Requirements as pre||Result of VIR MDF as certified by IPIRTI|
|As per 12406:2003||IS: 12406-2003|
|1.Dimension and Tolerance|
|d) Squareness, mm/m||Max 2||1|
|e) Edge straightness, mm/m||Max 2||1|
|2.Workmanship and Finish||——||Conforms|
|a) Average, Kg/cbm||600-900||761|
|b) Variation form mean density, %||A�10||A�0.46|
|4.Water Absorption, %|
|a) After 2hrs. Soaking||Max 9||6.9|
|b) After 24hrs. Soaking||Max 20||16.5|
|5.Linear Expansion (maximum)|
|a) Due to general Absorption after 24 hrs. Soaking|
|b) Due to surface Absorption (in thickness) after 24hrs.||Max 5||3.87|
|b) Variation from mean moisture content||A�3||A�0.2|
|7.Modulus of Rupture|
|a) Average||Min 28||32.9|
|b) Minimum individual||Min 25||31.9|
|8. Modulus of Elasticity, N/mmA?|
|a) Average||Min. 2800||3149|
|b) Minimum Individual||Min. 2500||3082|
|9. Tensile Strength Perpendicular to surface (Internal Board Strength), N/mmA?|
|a) Dry Test|
|i) Average||Min 0.8||0.9|
|ii) Minimum individual||Min 0.7||0.8|
|10.Screw without strength, N|
|a) Face||Min 1500||2965|
|b) Edge (For thickness >12mm)||Min 1250||1710|