EN 15185-2011 pdf download.Furniture – Assessment of the surface resistance to abrasion.
5.3 Abrasion paper strips
Taber S-422) or equivalent, of width (12,7 ± 0,1) mm and length about 160 mm. according to the following specification:
a) paper of grammage from 70 gIm2 to 100 gIm2
b) open coated 180 grit powdered aluminium oxide (A1203) having a particle size such that it will pass through a sieve of aperture 100 pm and remain on a sieve having an aperture of 63 pm;
c) adhesive backing.
5.4 Test apparatus
As specified In Iso 9352 with following deviations:
NOTE A s&iitable machine is available from Taber Acquisition Corp., Taber industries, 455 Bryant St P.O. Box 164, North Tonawanda. NY 14120, USA. This information is given for the convenience of users of this European standard and does not constitute an endorsement by CEN of the machine
a) the hardness of wheels’ rubber layer shall be between 60 and 70 Shore A, when measured in the middle of the contact surface; make 4 measurements and calculate the average value;
The laboratories shall measure the hardness at least once every 6 months.
b) weight of loading: every wheel shall apply a force (5,4 ± 0,2) N on the sample;
C) vacuum system: the distance between the vacuum suction nozzle (Inlet vacuum system) and the test area shall be (1,5 ± 0,5) mm. The vacuum system shall remove practically all the dust;
d) the distance between the middle axis of the sample holder and the wheels shall be calibrated according to Annex A.
5.5 Balance
The accuracy of the balance shall be 1 mg.
5.6 Conditioning chamber
A chamber with a standard atmosphere of (23 ± 2) °C, relative humidity (50 ± 5) %.
5.7 Diffuse light source
Prepare two abrasive wheels, in the correct hardness range (5.4), with conditioned unused strips of abrasive paper.
Clamp a zinc plate In the specimen holder, start the vacuum device, set the revolution-counter to zero, lower the wheels, ensuring that the arms are horizontal and the load on the zinc plate is (5,4 ± 0,2) N, and abrade the zinc plate for 500 revolutions. Wipe the zinc plate clean and weigh to the nearest 1 mg. Replace the abrasive paper on the wheels with preconditioned unused strips from the same batch, clamp the same zinc plate in the specimen holder, lower the abrasive wheels and operate the suction device. Abrade the zinc plate for an additional 500 revolutions, then wipe it clean and reweigh it to the nearest 1 mg.
Any box containing abrasive paper which causes a loss in mass of the zinc plate which is outside (120 ± 20) mg, for any pair of calibrate strips, shall not be used for testing.
The result (mean value of the 3 calibrations 1120) shall be named correction factor and shall be included in the test report.
7.3 AbrasIon of test area
Perform the test immediately after removal of the test surface and calibrated abrasive paper from the conditioning atmosphere.
Prepare two wheels, in the correct hardness range, with preconditioned unused abrasive paper from the same box previously approved by calibration. Fit the wheels to the machine and set the revolution counter to zero.
Clamp the test surface in the holder, ensuring that it is placed horizontally. Lower the abrasive wheels on to the specimen, ensuring that the arms are horizontal and the load on the samples is (5.4 ± 0,2) N. Start the vacuum device for removing practically all the dust, and begin abrading the test area.
NOTE If the arms are not honzontal, then there are two possibilities: to modify appropnately the apparatus or to reduce appropriately the th.ckness of the test surface before the conditioning, see Clause 6.
Before each assessment, in order to correctly assess the Initial Wear Point (lP), see 7.4. ensure the surface is free of dust. If needed, wipe with the cleaning cloth,
At the beginning of the test, the visual assessment shall be carried out, depending on the expected IP (see 7.4), as follows:
—- under 200 revolutions, every 10 cycles;
— over 200 revolutions, every 25 cycles;
— over 500 revolutions, every 50 cycles;
when close to IP, the assessment shall be carried out every 10 cycles.EN 15185-2011 pdf download.