EN 433-1994 pdf download.Resilient floor coverings Determination of residual indentation after static loading.
This EN 433 specifies a method for determining the residual indentation produced in a resilient floor covering after the application and removal of a constant load.
2 Definition
Fbr the purposes of this standard, the following definition applies.
residual Indentation
The difference between the initial thickness and the thickness measured 150 mm after removal of the load.
3 PrincIple
A test piece Is subjected to a static loading, the thickness being measured before loading and after various recovery periods.
4 Apparatus
4.1 A straight steel cylinder of diameter as specified in table 1 with the edge of the flat base slightly rounded.
4.2 A rigid, horLwntal platform of minimum dIameter 35 mm.
4.3 A device by means of which a preliminary force and a total force as specified in table 1 can be smoothly applied.
NOTE. The fnnne should not deform by more than O,OS mm niea.sured ri the direction of the axis under the maximum force. This defonnatlon has to be taken Into coniderat1on when measu ring Indentation.
4.4 A comparator for measuring the depth of indentation to ± 0,01 mm.
4.5 Apparatus for measuring the thickness of the test piece as specified in table 2.
4.6 A stopwatch.
4.7 An annular weiqht of approximate internal
dIameter 25 mm and mass 0,5 kg.
5 Sampling and preparation of test pieces
‘Hike a representative sample from the available material.
Bike three test pieces with a surface area of at least 3500 mm2 cut from a roll or different tiles.
6 CondItioning
Condition the test pieces at a temperature
of (23 ± 2) °C and relative humidity of (50 ± 5) % for a minimum of 24 h.
7 Procedure
Mark the place of measurement and measure the initial thickness of the test piece, , at its centre to 0,01 mm, using the appropriate apparatus specified In table 2.
Place the test piece on the platform. Place the annular weight on the test piece.
WIthin 5 s, apply the appropriate preliminary force specified in table 1 and adjust the comparator to zero, taking deformation of the frame Into consideration. Smoothly apply the appropriate total force specified in table 1, and start the stopwatch withIn 2 s.
Record the depth of indentation after 150 mm to 0,01 mm, and remove the force and the test piece from the platform.
N(Yl. This measurement hi not required In the calculaUon of results, but 1. required in a number of product specificnLk’ns.
After a further 150 mm, mcasurc the final thickness of the test piece, £1, at the same position, using the appropriate apparatus specified in table 2.
Repeat the test on the remaining test pieces.
8 Calculation and expression of results
Calculate the residual indentation, – £1, for each test piece. Calculate the mean value from the measurements taken and express the result to 0,01 mm.
9 Thst report
The test report shall contain the following
Information:
a) a reference to this standard, I.e. EN 433; b) a complete identification of the product tested, including type, source, colour and manufacturer’s reference numbers;
c) previous history of the sample; d) the mean value for residual indentation; e) the mean value for the depth of indentation after 150 mm, If required;
f) any deviation from this standard which may have affected the results.EN 433-1994 pdf download.
EN 433-1994 pdf download
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