Characteristics Value Remarks Tests conducted acc. to standard
Moisture content 3-10% PN-EN 322
Density 550-800 kg/m3 PN-EN 323
Structure Nominal thickness (t) [mm] Number of plies Sample structure
4 3 I-I Standard thickness of a plie is 1,5 mm (depending on thickness of plywood plies of 2,0 mm and 2,5 mm thickness are also used)
6 5 I-I-I
9 7 I-I-I-I
12 9 I-I-I-I-I
15 11 I-I-I-I-I-I
18 13 I-I-I-I-I-I-I
21 15 I-I-I-I-I-I-I-I
24 17 I-I-I-I-I-I-I-I-I
27 19 I-I-I-I-I-I-I-I-I-I
30 21 I-I-I-I-I-I-I-I-I-I-I
35 25 I-I-I-I-I-I-I-I-I-I-I-I
Width and length tolerance ± 3,5 mm PN-EN 315
PN-EN 324-1
Ultimate strength in static bending Min 50 N/mm2 along grains, Min 30 N/mm2 across grains For plywood with thickness of ≥9mm, standard structure PN-EN 310
Characteristics Value Remarks Tests conducted acc. to standard
Thickness tolerance Nominal thickness (t) [mm] Unsanded sheets Sanded sheets PN-EN 315
PN-EN 324-1
Thickness deflection / one sheet [mm] Nominal thickenss deflection [mm] Thickness deflection / one sheet [mm] Nominal thickenss deflection [mm]

≤ 12
1 +(0,8+0,03t)
-(0,4+0,03t)
0,6 +(0,2+0,03t)
-(0,4+0,03t)
> 12
≤ 25
1,5
> 25
≤ 30
0,8 +(0,0+0,05t)
-(0,4+0,05t)
> 30 +(0,0+0,03t)
-(0,4+0,03t)

For sanded sheets

Nominal thickness (t) [mm] 4 6 9 12 15 18 21 24 27 30 35
Tolerance [mm] 0,3 0,4 0,5 0,6 0,7 0,7 0,8 0,9 1,4 1,5 1,1
-0,5 -0,6 -0,7 -0,8 -0,9 -0,9 -1 -1,1 -1,8 -1,9 -1,5
Characteristics Value Remarks Tests conducted acc. to standard
Bonding quality Average value of ultimate strength on shearing fv [N/mm2] Wood destruction [%] PN-EN 314-2
0,2 ≤ fv < 0,4 ≥80
0,4 ≤ fv < 0,6 ≥60
0,6 ≤ fv < 1,0 ≥40
1,0 ≤ fv No requirements
Bonding Class Grade1 For interior plywood (with usage of urea-formaldehyde resin)  PN-EN 314-2
Grade 3 For exterior plywood (with usage of phenol-formaldehyde resin)
Formaldehyde emission Emission ≤ 3,5mg/m2h E 1 PN-EN 717-2

Physical and mechanical characteristics of plywood are given for illustrative purposes only.

characteristics of plywood