Perform a shear test on the plate

Activities

EN 636 - plywood - special features

The EN standard 636 regulates the special requirements for plywood when used in

  • Dry area (EN 636-1): Material humidity corresponding to a temperature of 20 ° C and a humidity higher than 65% for a maximum of a few weeks a year (service class 1 ENV 1995-1-1). Suitable for use in bio-risk class 1 of EN 335-3.
  • Humid area (EN 636-2): Material humidity corresponding to a temperature of 20 ° C and a surrounding air humidity higher than 85% for a maximum of a few weeks a year (service class 2 ENV 1995-1-1) Suitable for use in bio-risk classes 1 and 2 of EN 335-3.
  • Outdoor area (EN 636-3): under climatic conditions where the humidity is higher than the requirements of service class 2 (service class ENV 1995-1-1). Suitable for bio-risk classes 1, 2 and 3 of EN 335-3.

EN 314-1,2 - quality of the bond

This European Standard specifies a method for determining the quality of the gluing of veneer plywood using the shear test. Based on the corresponding quality classes (EN 636-1,2 e 3), the samples are exposed to various treatments that trigger accelerated aging.

EN 314-1 - Bonding quality - Test method

class

Test procedure

EN 636-1

(Dry area)

24 h immersion in a 20 ° C water bath

EN 636-2

(Humid area)

6 h immersion in boiling water, subsequent cooling in 20 ° C warm water for at least 1 h

EN 636-3

(Outside area)

72 h immersion in boiling water or 4 h immersion in boiling water with subsequent drying in the oven, immersion in boiling water for another 4 h, cooling in 20 ° C warm water for at least 1 hour

 

Following the test procedure, the shear tests are carried out, which prove two properties: average cutting resistance at tension pressure up to breakage, measured in N / mm2 and breakage average visible in the wood in percent (remaining wood quantity on the bond after breaking the sample)

The samples with a cutting resistance of ≥ 1.0 N / mm2 survive the test without a specific breaking value. The following table shows the corresponding measured values ​​based on EN 314-2:

 

EN 314-2, requirements for bonding quality

Average cutting resistance (Rt)

N / mm2

Cohesive break in percent (Rc)

0.2 Rt 0.4

Rc ≥ 80%

0.4 Rt 0.6

Rc ≥ 60%

0.6 Rt 1.0

Rc ≥ 40%

1.0 ≤ Rt

No requirement

Other binding types available:

  • IF20 Indoor
  • IW67 Humid area
  • AW100 Outdoor area

 

EN 323 - wood-based panels; Determination of the bulk density

This European Standard describes a method for determining the bulk density of wood-based materials. The results can be used to assess the moisture content. The bulk density is expressed in the formula kg / m3 and is calculated as follows:

Dove:

  • m Mass of the sample
  • b1, b2Side dimension of the sample
  • t Strength of the sample

The test is carried out on a precise sample and measured in micrometers and an accurate dimension of 0.01 mm; Length and width measured exactly calibrated to 0.1 mm; the density is determined with an electronic balance to an accuracy of 0.01 g.

Poplar wood is particularly valued for its lightness, characteristic in normal surroundings with a mass of 340 ± 50 kg / m3; For comparison, spruce has a mass of 450 ± 50 kg / m3.

 

EN 315 and EN 324-1,2 - wood-based panels; Determination of the panel dimensions

EN 315 shows the mass tolerances based on a moisture content of the sample between 8 and 12%. The values ​​are proportional to the thickness and are expressed in mm:

Panels raw

Plates sanded

Strength in (t)

mm

Thickness tolerance on a plate in

mm

Strength tolerance in

mm

Thickness tolerance on a plate in

mm

Thickness tolerance in mm

mm

3 ≤ t ≤ 12

1,0

+ (0.8 + 0.03 t)

- (0.4 + 0.03 t)

0,6

+ (0.2 + 0.03 t)

- (0.4 + 0.03 t)

12 ≤ t ≤ 25

1,5

Tolerance of squareness and straightness of the edge: 1 mm / m

Tolerance width and length: ± 3.5 mm

At first glance, the tolerances appear large, but we would like to point out that these are the maximum limits. At the request of our customers, we deliver panels with significantly lower tolerances than those specified in the EN 315 standard.
The tolerances are in accordance with EN 324 - 1.2.

The thickness, length and width of the panels are measured with calibrated tape measures in accordance with the EN 324-1 standard. Squareness and straightness of the edges are regulated according to the requirements of EN 324-2.

 

CE marking 2+

On 04/04/2011, the European Parliament adopted Regulation (EU) No. 305/2011 on March 9, 2011 on the “Establishing harmonized conditions for the marketing of construction products and repealing Council Directive 98/106 / EEC” was published in the European Official Journal L 88/5 published and replaced the existing EC Directive 98/106 / EEC on July 1st, 2013.
The manufacturer issues the declaration of conformity and thus assumes responsibility for the conformity of the construction product with the specified performance.
The manufacturer must bear the CE mark for “building materials”, i. H. provide every product that is permanently installed in building construction, bridges and works. The CE marking ensures that certified products meet certain performance requirements for certain areas of application. For panels made of plywood, the requirements are defined in detail in the standard EN 13986 DIN EN 3: Wood-based materials for use in construction - properties, evaluation of conformity and marking: determination of the flexural modulus of elasticity and flexural strength; Determination of the quality of the bond; Determination of the formaldehyde content

EN 13986 provides various systems that can be used for CE marking. The 2+ system is used to confirm the conformity of the panels for use as a structural element in internal or external applications. This system requires manufacturers to perform initial type testing (ITT) to provide performance characteristics and continuous factory production control (FBC) to ensure that these characteristics are maintained over time. An external certification body is responsible for monitoring and approving FPCs.

 

CE 2+ marking for fire protection

CE 2 + fire protection is a system for CE marking through which the fire behavior of wood-based materials is certified according to EN 13501-1 on the basis of the physical-mechanical requirements.

According to this rule, the fire behavior of materials is indicated by three parameters: reaction class of the flammability, the smoke development and the risk of dripping burning particles. For example, the symbol B-s1, d0 for a panel means flame retardant (B), no smoke development (s0), no drop formation (d0).

 

EU classes for fire protection

Euroclasses

definition

Typical materials

A1

non-flammable, no "flash over"

Stone, cement

A2

Thin plasterboard, mineral wool

B.

flame retardant, no "flash over"

Thick plasterboard, fireproof wood

C.

Plaster coatings

D.

Wood, wooden panels

E.

some synthetic polymers

F.

Responses not specified

 

Smoke development (S - smoke)

class

definition

s1

no / hardly any smoke development

s2

Medium smoke development

s3

Heavy smoke development

 

Burning drips (d - drops)

class

definition

d0

no dripping

d1

limited drainage

d2

heavy draining

 

EN 310 - wood-based panels; Determination of the flexural modulus of elasticity and the flexural strength

This European Standard defines a method for determining the modulus of elasticity and the flexural strength of wood-based materials with a nominal thickness of 3 mm or greater.
The flexural strength indicates the tension value (force / area) under breaking load. The modulus of elasticity, measured in N / mm2, is the relationship between tension and deformation and defines the stiffness of the slide. Flexural strength, strength and modulus of elasticity are determined by a test using a support load on the center line (flexion to 3 points).

 

EN 717-2 - Wood-based panels - Determination of formaldehyde release - Formaldehyde release according to the gas analysis method

This European Standard describes the determination of the formaldehyde release from coated and uncoated wood-based panels according to the gas analysis method.
The test is carried out in a sealed container at 60 ° C through which air is passed through the sample. This air is then filtered into distilled water, then treated with chemicals and placed in a spectrophotometer to determine the formaldehyde in mg / m2 • h. According to EN 13986, class E1 panels have a release ≤ 3.5 mg / m2 • h; Class E2 panels from 3.5 to 8 mg / m2 • h.

 

EN 120 - Determination of formaldehyde content; Extraction method called perforator method

The release of formaldehyde from chipboard is determined using the perforator method according to EN 120: 110 g of the sample are placed in a vessel with toluene, brought to the boil and the steam is filtered through distilled water. The water is then treated with chemicals and placed in a spectrophotometer to determine formaldehyde in mg / 100 g. According to EN 13986, class E1 panels have a release ≤ 6.5 mg / 100 g; Class E2 plates from 8 to 30 mg / 100 g.