BS EN 17456:2021 Wood flooring and parquet – Determination of top layer delamination of multilayer elements – Test method

BS EN 17456:2021 pdf free.Wood flooring and parquet – Determination of top layer delamination of multilayer elements – Test method.
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 13756. Wood flooring and parquet — Terminology
Iso 554, Standard atmospheres for conditioning and/or testing — Specifications 3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 13756 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https:f/www.iso.org/obp
3.1 top layer finished or unfinished upper wood layer, intended to be the visible side when the floor is installed [SOURCE: EN 13756:2018, 7.12]
3.2 delamination of top layer detachment of the top layer of a multilayer construction
4 Principle
Samples from multi-layer parquet elements are subjected to an aging-treatment according to 6.2. Afterwards the delamination of top layer bonding is assessed according to 6.3. Results are expressed In percent of top layer width according to Clause 7.
5 Apparatus
5.1 Conditioning room
Room or chamber, controlled at a temperature of (23 ± 2) °C and a relative humidity of (50 ± 5) %, in accordance with ISO 554.
5.2 Water bath
Water bath capable to maintain a temperature of (20 ± 2) °C.
5.3 Balance
Balance capable of weighing to the nearest 0,01 g.
5.4 Convection drying oven
Drying oven with internal air circulation and a permanent air exchange for drying at (60 ± 2) °C and (80 ± 2) °C.
5.5 Sliding calliper
Calliper for measurements to the nearest 0,1 mm with a sufficient length to measure over the whole panel width.
5.6 Feeler gauge Feeler gauge 0,2 mm thick
5.7 Climate chamber or box
Climate chamber or box, controlled at a temperature of (23 ± 2) °C and a relative humidity of (95 ± 5) % without condensation.
6 Procedure
6.1 Preparation
6.1.1 Sampling
Cut one test specimen from each of at least five multi-layer parquet elements to a size of:
100 mm length x element width x element thickness.
Due to the construction details sample has to contain board ends. Any profile on the short side shall be cut off (see Figure 1).
The long-side profiles shall not be cut off, these profiles shall not be assessed in the trial.
Test specimen shall be without any manufacturing defects (e.g. cracks in the glue line) or knot holes at the cross section.
6.1.2 ConditionIng
The test specimen shall be conditioned at a relative humidity of (50 ± 5) % and a temperature of (23 ± 2) °C in the conditioning room (5.1), to constant mass prior to measurement.
Constant mass is considered to be reached when the results of two successive weighing operations carried out at an interval of 24 h do not differ by more than 0,1 % of the mass of the element.
6.1.3 Measurement and recording before aging treatment
Proceed as follows with the method of measurement and record the results. For each test specimen:
a) one cross section (area with saw cut) shall be marked with an “A” and the other one with a 13 with a water-insoluble pen;
b) its mass shall be determined with the balance described in 5.3 with an accuracy of 0,01 g and record the result;
c) its top layer width shall be determined at cross-section NA”.
6.2 Aging treatment
6.2.1 General
The respective test specimens undergo the planned aging-treatment process as described in 6.2.2, 6.2.3 and 6.2.4.
Local authorities may require other aging-treatments, see Annex A.
6.2.2 Aging treatment AT1 oven drying
Each test specimen shall be dried in the convection dry oven described in 5.4 for (100 ± 4) h at a temperature of (60 ± 2) °C. The cut edge of the test pieces shall be parallel to the air flow. The arrangement of test specimen shall ensure a constant drying on all sides. The loading of the dry oven shall ensure a reproducible drying process.
NOTE For example, see EN 321:2001, § 6.1.2.1. step 5.
6.2.3 Aging treatment ATZ humid climate storage and re-drying
a) each test specimen shall be put in a climate chamber or a climate box according to 5.7 with 95 % (- 2/+4) relative air moisture content (avoid dew point) at a permanent temperature of (23 ± 2) °C for 72 h. The test specimens shall be put in an upright position. A distance of at least 10mm is to adhere between the test specimens;
b) after humid climate storage each test specimen shall be stored for 24 h to 48 h at a relative humidity of (50 ± 5) % and a temperature of (23 ± 2) °C in the conditioning room (5.1). The arrangement of test specimen shall ensure a constant drying on all sides;
c) afterwards each test specimen shall be dried in the convection dry oven described in 5.4 for (8 ± 1) h drying at a temperature of (60 ± 2) °C followed by (16 ± 1) h at a temperature of (80 ± 2) °C. The drying conditions shall comply with 6.2.2.
6.2.4 Aging treatment AT3 cold water storage and re-drying
a) each test specimen shall be put in the container according to 5.2 for (6 ± 0,25) h immersion in water with a permanent temperature of (20 ± 2) °C. The test specimens shall be put in an upright position, completely submerged (distance between the upper edge of test piece and the surface of the water shall be 20 mm, at least), with at least 10 mm distance from each other and to the edge of the container. To prevent floating and to secure water contact with the largest possible parts of sample surface the test specimen shall be weighted (e.g. metal nets on the container bottom and for weighting);
b) after water immersion each test specimen shall be stored for 24 h to 48 h at a relative humidity of (50 ± 5) % and a temperature of(23 ± 2) °C in the conditioning room (5.1). The arrangement of test specimen shall ensure a constant drying on all sides;
NOTE 1 For practical reasons (for example working hours of staff) in laboratory the range for storing the specimen is wide.c) afterwards each test specimen shall be dried in the convection dry oven described in 5.4 for (8 ± h) drying at a temperature of (60土2) °C followed by (16 ± 1) h at a temperature of (80 ± 2) °C. The : drying conditions shall comply with 6.2.2.
6.3 Evaluation of delamination
The evaluation of the delamination shall be carried out after the last drying. For each test specimen:
a) the delamination length of top layer (Di) bonding shall be evaluated visually at both cross sections (A and B);
b) if a delamination of top layer bonding is visible, it shall be tested with the feeler gauge described in 5.6. In so doing the feeler gauge shall be held at 65 mm from its free tip. Where the feeler gauge can enter the opening deeper than 5mm, it shall be marked at the cross sections with a pen;
c) failure in top layer or substrate layer, shall not be counted as delamination of top layer bonding, but shall be reported (e.g. “failure substrate layer”);
d) the delamination length of top layer bonding shall be measured with the sliding calliper described in 5.5 and the sum of delaminated length of adhesive joints of each layer type (top layer and substrate layer) at each cross section shall be recorded.
7 Calculation and expression of results
The delamination as a percentage of delaminated length related to the top layer width in the initial state shall be calculated for each cross section.
Calculate the mean of the delamination length of top layer (Dj of at least 10 cross sections.
8 Test report
The test report shall contain at least the following information:
a) all details necessary to identify the product tested;
b) reference to this document, EN 17456.BS EN 17456 pdf free download.BS EN 17456:2021 Wood flooring and parquet – Determination of top layer delamination of multilayer elements – Test method