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( WallMastersUsa.com Jollyboard)
is a hard brown sheet material 2.5 to 9mm thick, manufactured from wood
fibres. It is standard hardboard which is dense, highly compressed wood
fibre sheet material, very smooth on one side and a mesh pattern on the
reverse.
Related Documents :
Regulation : British Standard 1142 "Fibre Building Boards Part I 1971" and
Indian Standard 1658: "Specifications for Fibre Hardboards" include all
available International standard and give the procedure for sampling. The
standards include test levels for five properties: density, thickness,
length and width, water absorption and modulus of rupture. The standards
also include appendices giving dimensions and tolerances and superior test
level for these properties.
Description
Composition and manufacture : Wood is
reduced to fibres which are then felted and hot pressed to form sheets, with
the primary bond derived from the felting and inherent adhesive properties
of fibres.
Sizes : Sheet sizes generally available
are : 1220 mm x 2440 mm (4 x 8), 1220 mm x 1830 mm (4 x 6). Other sizes
can be obtained as per order.
Thickness available are 2.5,
3, 4.5, 6, 8 and 9 mm
Production tolerance :
Permissible deviations in length/width and thickness from manufacturers
stated sizes are specified to Table 1 and 2 of IS 1658 and in Table 3 of BS
1142: Part 2. Smaller tolerances than those specified can be obtained by
agreement.
Weight : weight of boards
varies according to brand. Typical weights (kg/m2) are 2.9 to 3 for 3 mm
thickness, 4 to 4.4 for 4.5 mm and 5.8 to 6 for 6 mm
Density : is generally within
the range of 800 1200 kg/m3
Appearances : Surface texture
is usually smooth on one side with a fine mesh pattern on the reverse.
Colour ranges from light gold to dark brown.
Special surface finishes :
Besides the usual smooth surface Jollyboard is available in moulded textures
and perforated surface.
Special boards available
: Prepared for industrial painting, regular painting, plastic faced, printed
wood grains, etc.
Climate Effect :
Like other timber-based products, standard hardboards are hygroscopic and
their dimensions change in response to changes in humidity. If these changes
take place after the boards have been fixed they may cause bowing. To avoid
this the moisture content of the board my first need to be adjusted to that
of the surrounding air by conditioning. |
