BS EN ISO 29862:2019 pdf download – Self adhesive tapes – Determination of peel adhesion properties
5.3.2 Tensile testing machine
A constant rate of extension (CRE) tension tester shall be used. It is proposed to use an electronic machine taking at least one reading per mm of tape peeled. The tester shall have two clamps with centres in the same plane, parallel with the direction of the motion on the same plane, parallel with the direction of the motion on the stressing clamp and so aligned that they will hold the specimen wholly in the same plane; a means of moving the stressing clamp at a uniform rate of (5 ± 0,2) mm/s and a device for recording load. The instrument shall be calibrated such that a maximum error of 2 % is allowed on the reading.
5.3.3 Stainless steel panels These shall be perfectly flat, at least 125 mm long and 50 mm wide and at least 1,1 mm thick, stainless steel type 1.4301 in accordance with the 2 R quality defined in EN 10088-2, having a bright annealed finish with a surface roughness of 50 nm ± 25 nm. Panels showing stains, discoloration or many scratches are not acceptable. New panels shall be cleaned prior to use as described in 5.5.2 except with ten washes of the final solvent. Between uses the panel test surface shall be protected from scratches and contamination and the panels shall be stored in the conditions described in 5.4.1.
5.3.4 Roller mechanically or hand operated A steel roller (85 ± 2,5) mm in diameter and (45 ± 1,5) mm in width, covered with rubber approximately 6 mm in thickness, having a hardness of (80 ± 5) Shore A. The surface shall be a true cylinder, void of any convex or concave deviations. The mass of the roller shall be (2 ± 0,1) kg. No part of the apparatus shall increase the mass of the roller during use. The roller shall move either mechanically or by hand at the rate of (10 ± 0,5) mm/s. 5.4 Test samples and test pieces
5.4.1 Condition the sample rolls of tape in the standard conditions of (23 ± 1) °C and (50 ± 5) % relative humidity (RH). Test at these conditions unless otherwise specified [see 5.7 i)]. If these tolerances cannot be maintained, the closest possible tolerances shall be used and these revised tolerances quoted in the report.
5.4.2 The test piece shall be 24 mm wide. A limit deviation of ±0,5 mm shall be allowed. The length shall be approximately 300 mm. Where the width of the specimen is less than 24 mm, apply one or more additional strips of the tape to give an equivalent width of 24 mm for rolling purposes. Alternatively acceptable rolling pressure may be obtained with a 1 kg roller on samples with width 8,5 mm to 17 mm or with 2 kg roller on samples with widths greater than 17 mm to a maximum of 34 mm.
5.4.3 Discard at least three but no more than six outer wraps of tape from the sample roll before taking the test pieces for testing.
5.4.4 Remove one test piece for each test to be performed. Remove the test piece from a freely rotating roll at the rate of 500 mm/s to 750 mm/s. Where high unwind force makes it impossible to remove the test piece at the prescribed rate, remove it at a rate as close to 500 mm/s as possible.
5.4.5 When the tape is wider than 24 mm, test pieces of the widest specified width are to be cut with an apparatus as described in 5.3.1 from the centre of a strip removed from the roll in accordance with 5.4.4. 5.4.6 Apply the test pieces within 5 min after unwinding.
5.5 Procedure
5.5.1 Standard test conditions
Standard test conditions shall be the same as 5.4.1 for test pieces and test samples conditioning.
5.5.2 Preparation of the panel
Dispense one of the solvents listed in 5.2.2 on to the panel, wiping it to dryness with fresh absorbent cleaning material. Repeat for a total of three washes with this solvent.BS EN ISO 29862 pdf download.