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BS EN 572-7-2004 歐洲U型玻璃標準



BS EN 572-7-2004 歐洲U型玻璃標準

1 Scope This Part of this European Standard specifies dimensional and minimum quality requirements (in respect of visual and wire faults) for channel shaped glass, as defined in EN 572-1, for use in building. This Part of this standard covers channel shaped glass supplied in stock sizes and final cut sizes. 2 Normative references This European Standard incorporates by dated or undated references, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 572-1:2004, Glass in building — Basic soda lime silicate glass products — Part 1: Definitions and general physical and mechanical properties 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 572-1:2004 and the following apply. 3.1 patterned channel shaped glass channel shaped glass with one patterned surface. A number of different patterns are available 3.2 wired channel shaped glass channel shaped glass which has a wire inlay in the web, i.e. across the width, B, which runs in the direction of the length, H. Additional wires may also be in the flanges 3.3 length, H, width, B, and flange height, d defined with reference to the direction of draw of the glass ribbon as shown in Figure 1. All corners are rounded 3.4 stock sizes glass delivered in the following sizes: 3.5 nominal length, H supplied in multiples of 250 mm NOTE Maximum length, H, available: 7 000 mm. 3.6 nominal width, B range from 232 mm to 498 mm

Key 1 direction of draw 3.7 nominal height of flange, d either 41 mm or 60 mm NOTE Not all widths, B, are available with all flange heights, d. 3.8 visual faults faults that alter the visual quality of the glass. These include bubbles, ream, scratches and inclusions and where applicable wire faults 3.9 flange deviation deviation, z, of flange from the vertical (see Figure 2) 3.10 wire faults deviation of the wire, penetration of the glass surface by the wire or break in the wire in the body of the glass 3.11 wire deviation deviation, y, of wire relative to a reference, e.g. line or straight edge, (see Figure 4) 4 Dimensional requirements 4.1 Method of measurement 4.1.1 Width, B, and height of flange, d These are measured at both cut ends of the piece using a vernier calliper with an accuracy of 0,1 mm. 4.1.2 Length, H This is measured at the centre of the web.

4.1.3 Thickness, c The actual thickness is measured at both cut ends. Measurements, to an accuracy of 0,1 mm, are made in the centre of the web and flanges. Measurement should be made by means of an instrument of the plate gauge type with a diameter of 50 mm ± 5 mm. 4.1.4 Flange deviation The deviation of the flange, z, from perpendicular to the web is determined with a right angle, as shown in Figure 2.

4.1.5 Squareness of cut The out of squareness of the web and flanges is determined at both cut ends. It is measured relative to a plane perpendicular to the direction of draw of the glass at the intersection of the centre line of the web and of the cut edge (see Figure 3). The deviation of the flange plane is measured. Figure 3 — Determination of squareness of cut 4.1.6 Wire inlay The relationship between the width of the wire inlay, in the web, and the width, B, of the web should be obtained by measurement. The actual distance between adjacent wires should be measured together with any variation in the spacing. The diameter of the wire should be measured. 4.2 Tolerances 4.2.1 Width, B, height of flange, d, and thickness c All measured values shall comply with Table 1. 4.2.2 Length The tolerance on measured length, H, is ± 3,0 mm. www.bzfxw.com EN 572-7:2004 (E) 7 4.2.3 Flange deviation The flange deviation, z, (see Figure 2) should not exceed 1,0 mm. 4.2.4 Squareness of cut The deviation (see Figure 3) shall not exceed 3 mm. 4.2.5 Wire inlay The wire inlay shall cover at least 75 % of the web width, B. The maximum distance between adjacent wires shall not exceed 35 mm. The allowable tolerance between adjacent wires is ± 6 mm. The diameter of the wire should be between 0,3 mm and 0,7 mm. 5 Quality requirements 5.1 General One quality level is considered in this standard. This is determined by evaluation of the visual and wire faults. 5.2 Methods of observation and measurement 5.2.1 Visual faults The piece of channel shaped glass to be examined is illuminated in conditions approximating to diffuse daylight and is observed in front of a white background. Place the glass to be examined vertically in front of the screen. Arrange the point of observation 2 m from the glass, keeping the direction of observation normal to the glass surface. NOTE The presence of bubbles, ream, scratches and inclusions. Table 1 — Tolerances on nominal width, B, height of flange, d, and thickness c Width, B (mm) Height of flange, d Thickness, c mm mm Nominal Tolerance Nominal Tolerance Nominal Tolerance 232 to 498 ± 2,0 41 ± 1,0 6 ± 0,2 232 to 331 ± 2,0 60 ± 1,0 7 ± 0,2 5.2.2 Wire faults A reference, e.g. line or straight edge, is placed parallel to the direction of the wires. The deviation, y, of the wire inlay in relation to this reference edge is measured (see Figure 4). Any penetration of the glass surface by the wire is noted. Any breaks in the wire are noted. www.bzfxw.com EN 572-7:2004 (E) 8 Out of square Waviness Bow Figure 4 — Determination of wire deviation NOTE The scale of these drawings is exaggerated to be explicit. 5.3 Acceptance levels 5.3.1 Visual faults If any bubbles, ream, scratches or inclusions are noted. They are not allowed. 5.3.2 Wire faults The deviation, y, (see Figure 4) shall not exceed 5 mm per metre. In no case is the wire inlay allowed to penetrate the surface. Breaks in the wire are not acceptable. 6 Designation Wired or unwired channel shaped glasses in compliance with this standard shall be designated respectively by: ? type (wired or unwired glass); ? tint (manufacturer's reference) or clear; ? pattern (manufacturer's reference) or not; ? nominal thickness in mm; ? nominal width, B, in mm; ? nominal height of flange, d, in mm; ? nominal length, H, in mm; ? reference to this Part of this standard. EXAMPLE Wired channel shaped glass, clear, pattern reference 'PATTERN', thickness 6 mm, width 26,2 cm, height of flange 41 mm, length 1,50 m, intended for use in building, is designated as follows: Wired channel shaped glass - EN 572-7_- clear 'PATTERN', 6 mm, 262 mm, 41 mm, 1 500 mm.