EN 994-2012 pdf download.Textile floor coverings – Determination of the side length,squareness and straightness of tiles.
This EN 994 specifies a method for determining the length and straightness of the edges and the squareness of floor covenngs in the form of right-angled tiles.
2 Normative references
The following referenced documents are Indispensable for the application 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 ISO 139:2005, Textiles — Standard atmospheres for conditioning and testing (ISO 139:2005)
3 Principle
The plane dimensions of a tile are measured at different points for each direction. In addition, at each corner of the tile the maximum deviation from the right angle is measured.
4 Apparatus
4.1 Length
4.1.1 Measurement device
Device which can be used to measure a dimension to an accuracy of 0,05 mm such as a slide gauge.
comparator table with stop or an opto-electronic system.
4.1.2 Support plate
Flat support plate, on to which the test specimen is placed for measurement. It shall be slightly bigger than the test specimen.
4.1.3 RigId plate
Rigid metal or glass plate, slightly smaller than the tile or any other device which can be used to hold the tile flat during measurement.
4.2 Squareness
4.2.1 Precision square
Precision square or any other device, for example an opto-electronic system which can be used to measure a right angle or angular deviation to an accuracy of at least 0.2 mm. if a square is used, it shall meet the following requirements:
a) The length of one of the straight edges shall be at least equal to the largest dimension of the tile to be checked, the second straight edge being not greater than 213 of this dimension:
b) The linearity error of the straight edges shall be less than or equal to 0.01 mm;
C) The angular error shall be less than or equal to 0,02 mm at 300 mm.
4.2.2 Flat surface
Flat surface as described in 4.1.2.
4.2.3 RIgid plate
Rigid plate as described in 4.1.3.
4.2.4 Shims
Set of shims, including 0,2 mm to 2,0 mm shims.
5 Sampling and preparation of test specimens
Take at least five tiles from each sample to represent the test specimens. If the sample comprises a pack of tiles, ensure that the first and last tiles are not used as test specimens.
6 Conditioning
Condition the tiles in the standard atmosphere for testing textiles as defined in EN ISO 139 for at least 24 h.
Conduct the tests in this atmosphere.
7 Test method
7.1 Length
Hold the test specimen flat using, the rigid plate described in 4.1.3. Measure the distance between the edges parallel to the direction of manufacture, then between the edges perpendicular to the direction of manufacture. in at least two different points.
If a different device is used, proceed as appropriate.
7.2 Squareness and straightness
Place the tile with its back against the flat support plate.
Place one edge of test specimen against a straight edge of the square o appropriate device and slide it until it makes contact with the other straight edge. then position the rigid plate without moving the tile.
Select the thickest shim which can be easily inserted between the second straight edge of the square and the end of the edge of the tile to evaluate the squareness deviation (see Figures 1 and 2). Find the thickest shim which can easily be inserted at any point between the second straight edge of the square and the tile to evaluate the straightness of the edges (see Figure 3).
Repeat this procedure for the three other test specimen edges.
If a different device is used. proceed as appropriate.
8 Calculation and expression of results
8.1 Length
For each tile and direchon, calculate the average of the measurements taicen. express the length ot the euge
by the result obtained in millimetres to one decimal place.
8.2 Straightness and squareness
Express the maximum deviation for each edge of each tile in millimetres to an accuracy of 0,05 mm.
a) For the end of the edge for squareness;
b) At any point of the edge for straightness.
Note the biggest deviation at a) or b) for each side.
Calculate the determined maximum deviation (in mm) for squareness and straightness in percentage from the nominal side length of the tile (in mm) by the following formula:
D=((MIN)x 100%)
where
0 is deviation in %
Mis maximum deviation in mm
N is nominal tile dimension in mm
9 Test report
The test report shall include the following information:
a) reference to this European Standard, i.e. EN 994:2012;
b) complete identification of the product tested, induding the type, origin, manufacturers reference numbers, C) details of the sample;
d) number of test specimens (tiles) submitted for testing;EN 994-2012 pdf download.