BS 7722 pdf free download

BS 7722-2002 pdf free download.Surface covered PVC-U profiles for windows and doors — Specification.
5 Properties of base profiles without a covering layer
5.1 General Base profiles without a covering layer conforming to BS 7413 shall be deemed to conform to the requirements of Clause 5.
5.2 Storage of test samples All samples shall be stored at (20 ± 5)  C.
5.3 Manufacturing tolerances Tolerances on dimensions, perimeter wall thickness and surface flatness shall be in accordance with BS 7413:2002, Table 3. If internal webs are present they shall be controlled so that reinforcement can be fitted without prior machining of the webs and so that the integrity of the drainage chamber is not breached. The integrity of the drainage chamber shall be confirmed by visual inspection.
5.4 Tear resistance test When tested before and after ageing in accordance with BS 7413:2002, annex K, the tear on all samples shall not propagate cleanly along the interface between the flexible and rigid elements for a distance of more than 5 mm at any one point. Partial fusion co-extrusions shall not be tested to the tear resistance test. 6 Properties of the profile after the application of the covering layer NOTE It is strongly recommended that the covered surfaces of profiles are protected to minimize the risk of surface damage prior to and during installation. Annex B gives advice on the use of protective tapes.
6.1 Storage and conditioning of test samples All samples shall be stored at (20 ± 5)  C.
6.2 Appearance and finish
6.2.1 General The sight surfaces of surface covered profiles shall be uniform and free from defects such as foreign bodies, cracks, sink marks, die lines, ripples, bulges, scratches or other surface defects when viewed by normal or corrected vision at a range of 1 m in 45 north sky light, viewing perpendicular to the surface as described in BS EN ISO 105-A01. Where the colour of a profile is specified, it shall be specified in terms of the foil manufacturer’s reference or its CIE LAB L a, b values in accordance with BS 3900-D9.
6.2.2 Single colour profiles The total colour difference ( ? E*), conforming to BS 3900-D8, -D9 and -D10, between any profile and the manufacturer’s stated reference colour shall not exceed the manufacturer’s declared value. NOTE 1 For instrumental colour measurement, the use of spectrophotometers is preferred. Tri-stimulus colorimeters should only be used for white or near-white colours. The measurement procedure should be chosen accordingly. NOTE 2  E = 1 from a reference colour equates to a potential colour difference of  E = 2 between two components which may be visible to the naked eye.
6.2.3 Non-uniform colour and texture profiles Reference samples of non-uniform colour and texture surface covered profiles shall be maintained demonstrating the extremes of permissible variation for comparison of the consistency of colour and appearance. Applied textured surfaces shall have the pattern applied uniformly. Each textured surface shall match the reference sample when viewed by normal or corrected vision at a range of 1 m, in 45 north sky light, viewing perpendicular to the surface as described in BS EN ISO 105-A01. Each colour and any pattern shall match the reference sample when similarly viewed.
6.2.4 Gloss When gloss is to be measured, the gloss value of a profile’s surface shall be measured according to BS 2782-5:Method 520A. The variation in gloss value shall not exceed 10 gloss units between a profile and its agreed comparison sample or declared gloss value.
6.3 Straightness When measured in accordance with BS 7413:2002, annex D, main surface covered profiles shall be straight such that the longitudinal axis of the profile deviates from the straight line by not more than 2 mm/ 2 m over any 2 m length. The cross-section of the profile shall conform in shape and dimensions to the manufacturer’s drawing subject to the tolerances in 5.3.
6.4 Heat ageing When tested in accordance with BS EN 478 surface covered profiles shall show no bubbles between the acrylic layer and the foil of more than 1 mm, cracks, surface irregularities or delamination. NOTE 1 There is no requirement for the flexible element of rigid and flexible co-extrusions. NOTE 2 An increase in gloss does not constitute failure.
6.5 Weldability When tested in accordance with the method given in BS 7413:2002, annex I, the mean weld failure stress shall not be less than 25 MPa and no individual result shall fall below 20 MPa. NOTE The second moment of area is calculated using profile dimensions prior to foiling.
6.6 Heat reversion When tested in accordance with BS EN 479 none of the main profiles tested shall have a mean reversion greater than 2 %. There shall also be not more than a 0.4 % difference between the individual sight surfaces of each sample. For ancillary profiles the maximum reversion shall be not more than 3 %. NOTE 1 For ancillary profiles there is no requirement for differences between individual surfaces. NOTE 2 The use of dark external glazing beads or other ancillary profiles may necessitate a lower reversion.BS 7722 pdf download.