DYAS pyroplex- Plywood with the low flammability

is an all-beech plywood made of many plies of rotary-cut beech veneers, glued together. All veneers are impregnated in special solution. This solution works as a fire retardant. Such a modified plywood features higher fire resistance compared to the standard, non-treated plywood boards.


Dyas Pyroplex

is a health harmless plywood complying with the A (E1) Class of formaldehyde escape according to ČSN EN 1084 norm - by the method of gas analysis


This special plywood is suitable for areas, where a big stress is given to the protection against fire and smoke. Ideal example of use is the inner facility of public buildings (airports, railway stations, gymnasiums, hotels, hospitals etc. Also use for inner facility of public vehicles (trams, trains and wagons, underground, buses) is an apposite example.


6, 8, 10, 12, 15, 18, 20, 25, 30, 35, 40, 50 mm
 (other thicknesses on customers' request)


Beech throughout - all veneers are beech


Class of gluing 2 (A 100) - ČSN EN 314-2 - can be used in protected exterior areas according to ČSN EN 636


1 250 x 2 200 mm
1 250 x 2 500 mm
(cross grain orientation - a grain run is parallel to the short side of the board)

Classification according to EN 13501-1: 2003:

Fire behaviour: "B"
Smoke production: s1
Flamingdroplets: d0


As per PN - 5 / DY/04 - plywood for a general use


is ordinarily sanded with grain 60, which is a basic sanding along with calibration. The surface may be slightly discolored due to the fire retardant content


6% to 12% (at the time of delivery)


Thickness Number of plies Approximate volume weight Thickness tolerance Bendingstrenght
(surface veneer grain orientation)
(kg/m3) (mm) lengthwise crosswise
6 5x 770 +0.5/-0.5 60,0 N/mm2 30,0 N/mm2
8 6x
10 7x
12 9x
15 11x
18 13x
20 15x 770 + 0.8/-0.8
25 18x
30 22x
35 25x 790 + 1,0/-1,2
40 29x
45 34x
50 39x

Product Sheet:

Declaration of perfomance:


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