WISA Form Birch – Wear Resistant Plywood

Download here our new data sheet from WISA-Form Birch

WISA-Form Birch is coated with a smooth and wear resistant phenolic film. Panels are used for concrete formwork. Standard colour is dark brown.

The product can be supplied also in special colours, for example light brown, black, green and opaque yellow. Our plywood suppliers do not recommend special colours for concrete formwork. Special colours are more suited to interior decoration in buildings. One of the most common uses for these products are the interior lining of delivery vans.

The WISA-Form product family consists of many different products developed for specific end uses. Please see also WISA-Form Spruce and WISA-Form Super.

General product information

Product description

Phenolic film coated panel for usage in concrete formwork where high requirements are set on the concrete surface and the number of reuse.

Bonding

Phenolic resin cross-bonded weather resistant glueing according to EN 314-2/class 3 (DIN 68705 Teil 3: BFU 100; BS 6566 Part 8: WBP).

Surface

Face and reverse: Brown phenolic film (abt RAL 8017). Coatings 120 and 220 g/m2.
Edge protection: Acryl-based paint.

Machining

Edge and CNC machinings available on request.

Panel sizes

1200/1250/1500 x 2400/2440/2500/3000/3600/4000 mm

Other dimensions on request.

Size tolerances:

• < 1000 mm +/- 1 mm
• 1000-2000 mm +/- 2 mm
• 2000-4000 mm +/- 3 mm

Squareness tolerance:

+/- 1 mm / 1000 mm

Properties of panel surface

The values are approximate and meant for guidance when choosing the film thickness.

Taber abrasion DIN 53799:

• Coating 120 g/m2 300 rev’s
• Coating 220 g/m2 600 rev’s
• Improved water resistance through coating.
• The coating is resistant to weak alkalis.
• Direct exposure to sunlight may accelerate the ageing and colour alterations of the surface.
• The coating thickness must be chosen according to the designed concrete quality, number of reuses and casting conditions.

Strength values

Face grain perpendicular to supports

Stud spacing mm

200

250

300

350

Thicknesses mm	Load kN/m2	Defl mm	Load kN/m2	Defl mm	Load kN/m2	Defl mm	Load kN/m2	Defl mm
12	49	0.5	39	0.8	26	1.0	18	1.2
15	60	0.4	48	0.7	40	1.0	29	1.2
18	71	0.4	57	0.6	48	0.8	41	1.1
21	83	0.4	66	0.5	55	0.7	47	1.0

 

Face grain parallel with supports

Stud spacing mm

200

250

300

350

Thicknesses mm	Load kN/m2	Defl mm	Load kN/m2	Defl mm	Load kN/m2	Defl mm	Load kN/m2	Defl mm
12	45	0.7	27	0.8	17	1.0	12	1.2
15	60	0.5	46	0.8	31	1.0	22	1.2
18	71	0.5	57	0.7	46	1.0	34	1.2
21	83	0.4	66	0.6	55	0.8	46	1.1

Moisture content 27%

The design tables have been drawn up for average casting needs of 20-30 reuses. If the panels are used for a long period with repeated castings at short intervals or if the conditions are otherwise difficult, the load values need to be reduced by 20-30%. The users are advised to consult the supplier before the final design of the forms.