WISA®-Form Slab
WISA-Form Slab is a coated
special plywood for use in loose
panel concrete formwork.
Base board
Spruce plywood made solely from spruce (softwood) veneers bonded together in a cross
banded construction.
Bonding
Phenolic resin cross-bonded weather resistant glueing according to EN 314-2/class 3
exterior, EN636-3.
Surface
WISA-Form Slab coating weight is 400gm/m2 both sides.
Face and reverse: Brown phenolic film combination (abt. RAL 8017).
Edge sealing: Water resistant paint.
Imprinted text: “WISA®-Form Slab”.
Thicknesses and weight
Nominal thickness
(mm)
Min. thickness
(mm)
Max. thickness
(mm)
Weight
(kg/m²)
15
14.3
15.3
7.6
18
17.1
18.1
9.0
21
20.0
20.9
10.2
Panel size
2400/2440/2500 x 1200/1220/1250 mm
Size limits
Size tolerances: < 1000 mm 1000-2000 mm > 2000 mm ± 1 mm
± 2 mm
± 3 mm
Other information
The panel can have dimensional changes due to changes in the air humidity.
End uses
Usage mainly for slab forms.
Typical number of reuses is likely to be about 5 -10 times.
However the number of reuses will depend on a wide range of factors including good site
practice, the required concrete finish, careful handling & storage of forms and the type and
quality of release agent.
Design Data
Mechanical properties of WISA-Form Slab, in standard thicknesses, moisture content 10 ±2 %.
Nominal
thickness (mm)
Characteristic strength
bending (N/mm2)
Mean modulus of elasticity
bending (N/mm2)
EmII
EmI-
fmII
fmI-
18
8170
3830
20.4
13.0
21
7547
4453
18.9
14.3
WISA-Form Slab is constructed with the grain direction of the outermost (face) veneers
running parallel to the long edges of the panel. Therefore boards should always be used
with the long edges parallel to the span direction to minimise deflection of the shutter.
Face grain
parallel to
the span ( I I )
Face grain
perpendicular
to the span ( I – )
grain direction of
surface veneers
grain direction of
surface veneers
WISA-Form Slab 18 mm
WISA-Form Slab 18 mm
grain direction perpendicular to the span
grain direction parallel to the span
L/300
1
400 mm
300
0,5
350 mm
250
200
300 mm
350
Span
600 mm
500 mm
0
1,5
30
0
500 mm
deflection mm
600 mm
400
1,5
400
600
500
2
Span
35
deflection mm
2
600
500
L/300
400 mm
1
250
350 mm
200
0,5
300 mm
250 mm
250 mm
200 mm
0
0
10
20
30
40
50
200 mm
0
0
60
10
20
WISA-Form Slab 21 mm
350 mm
250
200
0,5
300 mm
600
Span
600 mm
500
1,5
1
0
500 mm
35
400 mm
L/300
400
400
500 mm
300
deflection mm
600 mm
500
deflection mm
600
2
Span
0
35
60
grain direction perpendicular to the span
L/300
1
50
WISA-Form Slab 21 mm
grain direction parallel to the span
1,5
40
load kN/m2
load kN/m2
2
30
400 mm
300
250
350 mm
200
0,5
300 mm
250 mm
0
200 mm
0
10
20
30
40
50
60
250 mm
0
200 mm
0
load kN/m2
10
20
30
40
50
60
load kN/m2
Moisture content 27 %, short term loading
Partial safety factor for the material is 1.3. Partial safety factor for the loads is 1.2.
Deflection limit L/300 of the span
Support width is not taken into account in calculations
www.wisaplywood.com
www.upm.com
See “Guide to Good Site Practice” available from UPM.
UPM policy is one of continuous development. We reserve the right to amend specifications without notice
or obligation.
10/2010
UPM Plywood
Niemenkatu 16
P.O. Box 203
FI-15141 Lahti
Finland
Tel. +358 204 15 113
Fax +358 204 15 112
Recommendations for use
Cover the panels to protect them from direct sunshine and rain.
Seal the cut edges and machining made at site with paint suitable for exterior use.
Use good quality form oil.
Seal screw holes with silicone to prevent moisture absorption.
Clean the panels carefully after every use.
Handle panels with care to get maximum reuses possible.