EN
CEMENT-BONDED
PARTICLE BOARDS

SPECIFICATION

CEMENT-BONDED PARTICLE BOARD

NOMENCLATURE CBPB

Size, mm Weight of 1
sheet, kg
Sheet
area, m2
Sheet cubic
content, m3
Number of sheets
in 1 m3
Weight
1 m3, kg
length width thickness
2700 1250 8 36,45 3,375 0,0270 37,04 1300-1400
10 45,56 0,0338 29,63
12 54,68 0,0405 24,69
16 72,90 0,0540 18,52
20 91,13 0,0675 14,81
24 109,35 0,0810 12,53
36 164,03 0,1215 8,23
3200 1250 8 43,20 4,000 0,0320 31,25 1300-1400
10 54,00 0,0400 25,00
12 64,80 0,0480 20,83
16 86,40 0,0640 15,63
20 108,00 0,0800 12,50
24 129,60 0,0960 10,42
36 194,40 0,1440 6,94

PHYSICAL-MECHANICAL PROPERTIES OF CBPB

PROPERTY,
unit
Rate
1. Density, kg/m3 1250 - 1400
2. Moisture, % 9 ± 3
3. Thickness swelling after 24 hours, %, not more 2
4. Water absorption after 24 hours, %, not more 16
5. Bending strength, P, not more

for thickness 10, 12, 16 mm
for thickness 24 mm
for thickness 36 mm


12
10
9
6. Tensile strength perpendicularly to board plane P, not less 0,4
7. Flexural modulus, P, not less 3500
8. Impact strength, J/m2 9
9. Flammability class 1
10. Frost resistance (reduction of flexural strength after 50 cycles), %, not more 10
11. Roughness of a face Rz concerning national standards ( 7016-82), mm, not more for plates:

not grinded
grinded


320
0
12. Thickness limit deviation, mm, not more, for plates:

grinded
not grinded, thickness: 10 mm
12 ÷ 16 mm
24 mm
36 mm


± 0,3
± 0,6
± 0,8
± 1,0
± 1,4
13. Length and width limit deviation of plates, mm: ± 3
14. Heat conduction coefficient, /(m): 0,26
15. Coefficient of linear expansion, mm/(long metre.°C) or degr.-110-6: 0,0235 23,5
16. Vapour permeability coefficient, mg/(mhP): 0,03

REFERENCE PARAMETERS OF PHISICAL-MECHANICAL PROPERTIES OF CBPB

Parameter,
unit
Rate for plates CBPB-1 GOST
1 Flex modulus, P, not less 3500 GOST 10635-88
2 Hardness index, P 46-65 GOST 11843-76
3 Impact elasticity, joule/m, not less 1800 GOST 11843-76
4 Resistivity against pulling screws out of plates, /m 4-7 GOST 10637-78
5 Specific heat capacity, k joule (kg ) 1,15 -
6 Class of bioproofness 4 GOST 17612-89
8 Reduction of bending strength, % (after 20 cycles of thermal and humidity impact), %, not more 30 -
9 Thickness swelling (after 20 cycles of thermal and humidity impact), %, not more 5 -
10 Inflammability Group of poorly combustible G1 GOST 30244-94
11 Frost resistance, (reduction of bending strength after 50 cycles), %, not more 10 GOST 8747-88

LOADING TABLE OF CBPB CONTINUOUS LOAD 1 FIELD CONSOLE

Bay,
mm
Load, kN
Thickness
8 mm
Thickness
10 mm
Thickness
12 mm
Thickness
16 mm
Thickness
20 mm
Thickness
24 mm
Thickness
36 mm
200 0,213 0,345 0,480 0,813 1,414 2,007 4,802
250 0,171 0,267 0,387 0,623 1,031 1,572 3,280
300 0,142 0,212 0,307 0,508 0,803 1,167 2,687
350 0,110 0,168 0,267 0,423 0,688 1,030 2,288
400 0,096 0,153 0,248 0,377 0,622 0,945 2,042
450 0,082 0,128 0,195 0,347 0,553 0,760 1,147
500 0,056 0,095 0,185 0,345 0,541 0,667 1,572

HEAT ENGINEERING PROPERTIES

DUE TO WOOD AND CEMENT INTEGRITY IN CBPB, THE PLATES REPRESENT HOMOGENEOUS SOLID MATERIAL WITHOUT AIR DROPLETS. THIS GUARANTEES HIGH THERMAL CONDUCTIVITY.

THAT IS WHY CBPB ARE USED MOSTLY IN CONSTRUCTIONS WHERE A COMBINATION OF HIGH TENABILITY AND LOW TEMPERATURE RESISTANCE OF A MATERIAL IS NEEDED. HEAT ENGINEERING PROPERTIES OF CBPB ARE ESTIMATED WITH THE HELP OF THERMAL CONDUCTIVITY COEFFICIENT WHICH IS THE MOST IMPORTANT THERMAL RATE OF CONSTRUCTIONAL MATERIALS.

Thermal conductivity coefficient dependence on the thickness of a plate

Thickness of plates, mm Thermal conductivity, W/m°C Thermal resistance, m2°C/W
8 0,26 0,031
10 0,035
12 0,046
16 0,062
20 0,077
24 0,092
36 0,138

Acoustic isolation

Isolation index of airborne sound

CBPB 10 mm RW=30 dB
CBPB 12 mm RW=31 dB

Isolation index of impact noise

Cement-bonded particle boards having thickness 20 and 24 mm, put just on the reinforced bearing concrete floor of a measuring chamber NIISPh RAASN provide improvement of isolation of impact noise for 16-17 dB correspondently.

When putting cement-bonded particle boards having thickness 20 and 24 mm not just on the reinforced bearing concrete floor, but on the intermediate layer of elastic soft material comes additional improvement of isolation of impact noise which makes up 9-10 dB.

Resistivity against pulling screws out of plates

Type of a
screw,
DxL, mm
Diameter of a hole
for a screw, mm
Average
resistivity out of
5 tests, N/mm
Resistivity
spreading,
N/mm
1 5,5 30 3,0 122 118 ÷ 137
2 5,0 30 3,0 85 68 ÷ 103
3 4,5 30 3,0 93 80 ÷ 108
4 4,0 30
(L of screw 20 mm)
2,5 110 88 ÷ 147
5 4,0 30
(L of screw total)
2,5 114 103 ÷ 124
6 3,5 30 2,5 104 87 ÷ 116
. 105

Rambler's Top100 Rambler's Top100