BS EN ISO 8033:2017 pdf download – Rubber and plastics hoses — Determination of adhesion between components (ISO 8033:2016)
Make two parallel cuts on the strip 25 mm ± 0,5 mm apart, taking care not to cut through the yarns. Separate a layer for a distance sufficient to enable the separated ends to be held in the grips of the test machine (see Figure 3).
6.3.5 Type 4 Cut a suitable length of hose in half longitudinally. From one of the halves, cut a strip 10 mm ± 0,5 mm wide, or of the maximum width obtainable if the width is less than 10 mm. Separate a layer for a distance sufficient to enable the separated ends to be held in the grips of the test machine (see Figure 4).
6.3.6 Type 5 Cut a suitable length of hose in half longitudinally. Using a twin-bladed tool, cut from one of the halves a centrally located longitudinal strip 5 mm ± 0,2 mm wide through the lining and open up one end of the test piece to form a lip. Separate a layer for a distance sufficient to enable the separated ends to be held in the grips of the test machine (see Figure 5).
6.3.7 Type 6 Cut a ring 35 mm ± 2 mm wide from the hose at right angles to its longitudinal axis. Make two circumferential cuts through the cover 25 mm ± 0,5 mm apart and located centrally on the test piece. Make a transverse cut across the 25 mm width through the cover and open up on one side of the cut to form a lip (see Figure 6). NOTE When cutting ring-shaped test pieces from a hose, it is advisable to insert a wooden cylinder, or similar device, into the hose before cutting out the test piece.
6.3.8 Type 7 Obtain a strip from the hose wall by cutting along the reinforcing helix through the complete thickness of the hose wall and trim to 160 mm long and 25 mm ± 0,5 mm wide or the maximum width obtainable if the width is less than 25 mm. Separate a layer for a distance sufficient to enable the separated ends to be held in the grips of the test machine (see Figure 7). This is an optional test for helix-reinforced hoses made in long lengths. It does not apply to hoses made to individual lengths, with special ends, built-in fittings, etc. If the spacing between adjacent coils of the helix is less than 10 mm, leaving an appropriate length (i.e. more than 160 mm or 25 mm) without applying reinforcing helix on one end of the hose is recommended during manufacturing, so that this end has the same process and state with the hose body which applied helix. Cut this part off and prepare the test piece according to type 4 or type 8.
6.3.9 Type 8 Cut a ring-shaped test piece 25 mm ± 0,5 mm wide from the hose at right angles to its longitudinal axis. Make a transverse cut across the 25 mm width through the cover and open up on one side of the cut to form a lip (see Figure 8). NOTE When cutting ring-shaped test pieces from a hose, it is advisable to insert a wooden cylinder, or similar device, into the hose before cutting out the test piece.
6.4 Conditioning of test pieces No tests shall be carried out within 24 h of manufacture. Before testing, test pieces shall be conditioned at standard temperature and humidity (see ISO 23529) for at least 16 h; this may be part of the 24 h after manufacture.
6.5 Time interval between vulcanization and testing For evaluations intended to be comparable, the tests should, as far as possible, be carried out after the same time interval after manufacture. ISO 23529 shall be followed for the time between sample manufacture and testing.
7 Procedure
7.1 Preparation
A separate test piece shall be used for each interface to be tested.BS EN ISO 8033 pdf download.