MAIN PROPERTIES OF
3.101 Sizes of
Standard lenght: 3200 mm, 2800 mm,
Standard width: 1250 mm
size: 590 x 590 mm.
Standard thickness: 8,10,12,14,16,18,20,24,
On special request, the plates with a thickness different than the ones
mentioned above, can be provided in a thickness of 8 mm and 40 mm.
Quantity per unit area and thickness tolerance as a function of
thickness of the
To smooth construction boards, tolerance compared to the named thickness
is uniform + -0.3 mm.
3.102 Density of
In accordance with the standards EN634-2 article 2, the density of the
boards should be above 1000 kg / m (3)According
to the relevant test results, at a temperature of 20 ° C, relative
humidity of 50-60% and a moisture content of 9% for tables, the density
boards is: § = 1450 + -100 kg /
For static calculations - and for security reasons - it is recommended
to increase or decrease the maximum density value of 20%
3.103 Moisture content in the transport
Similar to wood, in natural conditions, the
building boards acquire a balanced moisture content depending on
temperature and humidity.
The moisture content in accordance with specific standards MSZ EN 634-2
= 9 + -3%
reached in hydroscopic equilibrium corresponding to a temperature of 20
° C and humidity equal to 50-60%.
Equilibrium moisture content than air humidity
Average moisture content of balanced
as a function of humidity, T = 20 ° C
At a temperature of 20 ° C and relative humidity of 35%, the moisture
content is balanced by 7%.
At a temperature of 20 ° C and relative humidity of 60%, the moisture
content is balanced by 12%.
At a temperature of 20 ° C and relative humidity of 90%, the moisture
content is balanced by 19%.
Water and vapour absorption
of the building boards
It's well known that moisture plays a significant role in seasoning
It's important, therefore, accurately establishing rules for absorption
and transmission of' water.
3.105.1 Absorption of
Absorption of water vapor
in atmospheres with high humidity and temperature.
T = 40 ° C § =
100% (tropical climate)
Absorption of steam of
(T = 40 c°; § = 100%)
Figure 4. momentarily
shows the average moisture content of the
boards construction in dry conditions as a function of time.
The state of momentary absorption of cement attached to the particle
board showing the deviation. This
deviation is caused by uneven and partially organic composition of the
board, and at the same time, the difference in density. Within
individual samples, its components with a 'high and show a minimum
density of the respective rates of absorption, while the minimum and
maximum u values obtained are higher for those elements.
3.105.12 Absorption in atmospheric spaces
t = 20+- 2 C°, § = 45 +- 5%
Absorption of the
table , saturated in exposure to rain later in the dry areas of
= 20 + - 2 ° C, § = 45 + - 5%)
Figure 5 and 6 show the average of momentary moisture content of
concrete attached to the chipboard all'esporsi bathe in the rain and
evaporation, respectively, until reaching a dry state as a function of
Note that the maximum water absorption of the table, again treated, has
moisture content is balanced for that atmosphere would be about 7%. The
figures show that even the board treated again reached that value,
despite the time available for absorption seemed sufficient.
Absorption of the
table in an environment of saturated steam, then dry in terms of
(t = 20 +-2C °, § = 45 + -5%)
Water absorption exposing the table in the rain
t = 14 +- 0,5 C°,
p = 2 bar
Absorption of a
board totally exposed dry in the rain.
(t = 14 + -0.5 ° C, p = 2 bar).
Figure 7 shows the average of momentary moisture content of the table
totally exposed dry in the rain, as a function of time.
Moisture resistance of the
shows good results.
3.105.3 Moisture released of
t = 20+-2C°, § = 50+-5%
Issue Table of moisture
building boards, saturated by the absorption of water vapor in
= 20+-2C°, § = 50+-5%)
Desorption of the
construction tables saturated in exposure at the rain weather
(t = 20+-2C°, § =
Figures 8 and 9 shows the average of momentary moisture content of the
cement combined with chipboard, wet from saturation, from absorption of
water vapor and exposure to rain, respectively, as a function of time.
Release of moisture absorbed by the table in a state of equilibrium in
atmospheric spaces up to states of total dryness.
102C°, § = 0%)
Release of moisture absorbed by the
table , saturated absorption of water vapor and in a state of balance
from atmospheric spaces up to a state of total dryness.
(t= 102C°, § =0%)
Release of moisture absorbed by the
table , saturated in exposure at the rain and in a state of equilibrium
in atmospheric spaces up to a state of total dryness.
(t= 102C°, § =0%).
The figures 10 and 11 show the average of momentary moisture content of
boards construction wet absorption of water vapor and exposure to
rain up to saturation, then dry state of equilibrium in atmospheric
spaces, depending on time.
it's claimed that the total absorption of water by
is not greater than 35% moisture even permanent. It's
independent by the level of humidity.
Pre-treatment of the board significantly affects the absorption
Water absorption of cement attached to chipboard through saturation.
Figure 12 shows the temporary average moisture content of the
tables was completely dry as a function of time.
The underlying follows a logarithmic curve, showing
clearly the laws of diffusion.
It is said that initially the water uptake increases drastically,
reaching a maximum value of moisture,
about 50 hours of saturation.
There has been a significant change in the moisture content after the
time of saturation.
u. max. was about 27%.
Absorption of watre of
table totally dry through the saturation
3.107 Bulge thickness
When making tests on the cement particle board than the standard
combined with the MSZ EN 317
thickness swelling after 24 hours of saturation
will be about 1.5%.
The two floors of cement attached to chipboard are often subject to
asymmetric climate weights. It
was conducted a test on the following excessive conditions: the upper
part of a test sample, loosely placed in a water bath, it has
deteriorated with the contact of the outside air at a temperature of T =
20 + - 2 ° C and relative humidity of §
= 65 + - 5%. Figure
13 shows the spread points that measure deformation as a function of
Measurement points located as a result of climate asymmetrical weight
plotted versus time.
isometric drawing of most evident deformation
Deformation can be seen most dramatically in the first 3 days, while the
deformation more evident in the 22nd day.
In a further observation, the deformation is insignificant.
Figure 14 shows the isometric drawing of the deformation most eminent.
3.109 Thermodynamic characteristics of
shows the building characteristics of cement attached to chipboard
the building characteristics of cement attached to chipboard,
values of thermal resistance of the tables with different
characteristics and thickness.
Coefficient of heat transmission of
building panels with different thickness.
3.110 Characteristics of fire resistance of
Figure 15 shows the core values provided to the fire resistance of
cement combined with chipboard on the rigid wood structure
The essential value of fire resistance depends largely on the
composition and location of the structure built. Core
values shown in Figure 15, are directed only at tables vertically placed.
For each structure just created, the fundamental value of fire
resistance must be checked verifying it in accordance with the standard
Subject to the fire resistant tables, the specific standards change from
country to country; for the country of production, national
characteristics are as follows:
According to DIN 4102
boards are "B1" fire resistant
Austrian standard O NORM B 3800 defines
tables construction, as combustible material class "A" (Versuchs-und
Forschungsanstalt der Stadt Wien, MA39 F-test report No. 367/78 /
mm TH = ora 0,07
10 mm TH = ora 0,15
12 mm TH = ora 0,21
14 mm TH = ora 0,27
16 mm TH = ora 0,31
18 mm TH = ora 0,35
20 mm TH = ora 0,38
22 mm TH = ora 0,41
24 mm TH = ora 0,44
28 mm TH = ora 0,49
40 mm TH = ora 0,61
Fire resistance value as a function of thickness
The product itself is highly indicative targets for noise reduction. Good
sound insulation can only be realized through a correct use of various
sound-absorbing materials, any material breaks down certain frequencies.
Sound insulation of
tables according to thickness
R = average number of sound insulation (piece)
Concrete - 150 mm, 480 kg / m (q)
Solid Brick - 270 mm, 360 kg / m (q)
chipboard with sand
solid table - 80 mm, 80 kg / m (q)
3.112 Rough surface, quality surface
The quality of tables surface is mainly determined by the degree of
roughness is the average value of large and small protrusions or dents
on the surface, compared with a theoretical surface. About
boards, controlled by a method of air pressure, the value of the rough
surface is about 120 - 150 microns .*