CAN CGSB-12 3-M91-1991 Flat Clear Float Glass.pdf

1、NATIONAL STANDARD OF CANADA CAN/CGSB-l2.3-M91 Supersedes CAN/CGSB- 12.3-M76 Flat, Clear Float Glass d Canadian General Standards Board CGSB CAN/CGSB- l12.3-M9L Xt W L874b50 OOOLL84 Tb9 D The CANADIAN GENERAL STANDARDS BOARD (CGSB), under whose auspices this standard has been developed is a governmen

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17、6 11 Laurier street Hull, Quebec in Person - Piace du Portage III, 9C1 NATIONAL STANDARD OF CANADA CAN/CGSB-12.3-M91 Supersedes CAN/CGSB-12.3-M76 FLAT, CLEAR FLOAT GLASS Prepared by the Approved by the Canadian General Standards Board -9 Standards Council of Canada 4F a Published April 1991 by the C

18、anadian General Standards Board Ottawa, Canada K1A 1G6 Minister of Supply and Services Canada - 1991 No part of this publication may be reproduced in any form without the prior permission of the publisher. Miiley, B. Chairman Armbruster, G. Auger, J.P. Bailey, D.W. Clarke, D. Cole, Ms. B. Franche, G

19、. Harmsworth, L.G. Hawley, R. Jones, S. Kenny, T. MacDonald, A. Prohaska, D.T. Seeseman, H. Sheehan, K.P. Smith, WJ. Werthwein, P.S. Zdanowicz, A. Ziobroski, J. Khan, R.A. Secretary CANADIAN GENERAL STANDARDS BOARD COMMITTEE ON GLASS (Membership at date of approval) Indalglass International Plasti-G

20、lass Hyalin International Inc. ORTECH International Duplate Canada Inc. Department of Consumer and Corporate Affairs Canada Mortgage and Housing Corporation Department of Labour, Saskatchewan Department of Public Works Dashwood Industries Ltd. Lamilite Ltd. MacDonald Minor Inc. PPG Industries Canada

21、 Inc. 3M Canada Inc. Department of Transport Ministry of Municipal Affairs, British Columbia AFG Glass Inc. Ministry of Housing, Ontario Warnock Hersey Professional Services Ltd. Canadian General Standards Board O Acknowledgmeni is made for the French translation of this National Standard of Canada

22、by the Transidion Bureau of the Department of ihe Secretary of State. C AN/CCSB- 123M91 CGSB CANICGSB- 12-3-fl91 XX 5874650 0001187 778 CANICCSB-12.3-M91 Supersedes CAN/CGSB-12.3-M76 CANADIAN GENERAL STANDARDS BOARD FLAT, CLEAR FLOAT GLASS 1. SCOPE 1.1 This standard applies to flat, clear glass of t

23、he float type produced by floating the glass on a bath of molten metal. 1.2 The testing and evaluation of a product against this standard may require the use of materials and/or equipment that could be hazardous. This document does not purport to address all the safety aspects associated with its us

24、e. Anyone using this standard has the responsibility to consult the appropriate authorities and to establish appropriate health and safety practices in conjunction with any existing applicable regulatory requirements prior to its use. 2. APPLICABLE PUBLICATIONS 2.1 The following publications are app

25、licable to this standard: 2.1.1 Canadian General Standards Board (CGSB) CAN/CGSB-12.4-M - Heat Absorbing Glass. 2.1.2 National Research Council of Canada (NRC) National Building Code of Canada. 2.1.3 ASTM C 162 - Definition of Terms Relating to Glass and Glass Procedures. Reference to the above publ

26、ications is to the latest issues, unless otherwise specified by the authority applying this standard. The sources for these publications are shown in the Notes section. 2.2 O 3. TERMINOLOGY 3.1 Glass and Types of Glass Glass - Glass is an inorganic product of fusion that has cooled to a rigid condit

27、ion without crystallizing. Glass is typically hard and brittle, and has a conchoidal fracture. It may be colourless or tinted, and transparent to opaque. Masses or bodies of glass may be tinted, translucent, or opaque by the presence of dissolved, amorphous or crystalline material. Glass that does n

28、ot contain such added materials is designated as “clear” or transparent. Plate glass - Glass from which surface irregularities have been removed by grinding and polishing, so that the surfaces are plane (flat) and parallel. Float glass - Glass that has virtually plane and parallel surfaces formed by

29、 floating in a continuous ribbon of glass on the surface of a bath of molten metal in a controlled atmosphere. Central Area of Sheet - The central area is considered to form an oval or circle centred on the sheet whose axes or diameters do not exceed 80% of the overall dimension. This allows a fairl

30、y large area at the comers that may have imperfections not allowed in the centrai area. 3.2 3.3 Defects in Glass Bubbles - Gas inclusions in any glass. These inclusions are almost always brilliant in appearance. The term is applied to all such inclusions larger than 1.0 mm in maximum dimension, The

31、term “small bubbles” refers to size between 1.0 and 2.5 mm (see Seeds). 1 Cords (see Ream) - Heavy strings incorporated in the sheet rather than on the surface, occurring without any regularity of direction and appearing to be of considerable thickness. Crush - A lightly pitted area resulting in a d

32、ull gray appearance over the region. Digs - Deep, short scratches. Dirt - A small particle of foreign matter imbedded in the glass surface. Finish - See Process Surface Defects. Fire Cracks - Small cracks penetrating the surface of the glass usually in the shape of short hooked crescents. Gaseous In

33、clusions - Round or elongated bubbles in the glass. Heavy Seeds - A condition in which the fine and coarse seeds are very numerous, such as four or more to the square centimetre. Knot - A transparent area of incompletely assimilated glass having an irregular knotty or tangled appearance. Lines - Fin

34、e cords or strings, usually on the surface of sheet glass. Waves that extend continuously across the sheet, so that the reflection from the surface appears as a line or series of lines extending either the full width or a considerable distance across the sheet. Open Gaseous Inclusions - Bubbles at t

35、he surface of glass that are open, leaving a cavity in the finished surface. Process Surface Defects - Very fine surface defects remaining on the surfaces of plate glass form the grinding and polishing process, consisting of fine pits and cracks that are denoted as “finish”; when this condition is v

36、isible, it is called “short finish.” Slight surface defects that originate in the process; these can be small particles of foreign materials on either surface or slight defects in the bottom (float) surface. Ream (see Cords) - Inclusions within the glass, or layers or strings of glass, that are not

37、homogeneous with the main body of the glass. Rubs - Abrasion of the glass surfaces producing a frosted appearance. A rub differs from a scratch in having appreciable width. Sand Holes - Rough spots on the polished surface, produced during coarse grinding, that fine grinding did not remove later owin

38、g, to some extent, to coarse grains of grinding sand becoming mixed with finer grades. Scratches - Any marking or tearing of the surface appearing as though it had been done by either a sharp or rough instrument. Scratches occur on glass in ail degrees from various accidental causes. Block reek is a

39、 chain-like scratch produced in polishing. A runner-cut is a curved scratch caused by grinding. A sleek is a hairline scratch. A cmsh or rub is a surface scratch or series of small scratches generally caused by handling. Seeds - Minute bubbles less than 1.0mm diameter. Fine seeds are visible only up

40、on close inspection, usually appearing as small specks, and are an inherent defect in the best quality of plate glass. Seeds about 1.0 mm in diameter are usually considered coarse seeds. Short Finish (see Process Surface Defects) - Insufficient polish or lack of brilliancy; improperly finished surfa

41、ce that has the appearance of being slightly pitted and wavy when the surface is viewed in reflected light. These indentations, which are slight, have a polished rather than a ground surface, but the general effect is a slight dulling of the surface. Poor polish is usually caused by improper grindin

42、g. Skim - Streaks of dense seed with accompanying small bubbles. Sleek - A fine scratchlike mark having smooth boundaries, usually produced by a foreign particle in the polishing operation. Stones - Any opaque or partially melted particle of rock, clay or batch ingredient embedded in the glass. Stri

43、ngs (see Ream) -Wavy, transparent lines appearing as though a thread of glass had been incorporated into the sheet. Wave - Defects resulting from irregularities of the surfaces of glass making object viewed at varying angles appear wavy or bent. Additional definitions of terms relating to glass and

44、glass products may be found in ASTM C 162. 3.4 2 CAN/CGSB-123-M91 CGSB CAN/CGSB- 12=3-M9L * 1874650 0001189 540 4. 4.1 5. 5.1 5.2 5.3 5.4 5.5 CLASSIFICATION The float glass shall be supplied in the following qualities, as specified (par. 8.1): Qualities Silvering Mirror Glazing (Selected Glazing) Gl

45、azing. DETAILED REQUIREMENTS Dimensions -The clear float glass shall be supplied in the dimensions specified (par. 8.1) within the tolerances for thickness, length and width stated in Table 1. Squareness - The corners of any rectangular piece of float glass shall not deviate from a right angle by an

46、 mount greater than that represented by 0.075 or 1.3 mm/m. Light Transmittance - The clear float glass shall have nominal percentages of light transmittance (within a tolerance off 5%) according to thickness given in Table 1, when tested in accordance with the procedure stated in CAN/CGSB- 12.4-M. N

47、ominal Thickness mm 2 3 4 5 6 8 10 12 15 19 22 25 Thickness Tolerance mm f0.5 & 0.5 f 0.5 k 0.5 f 0.5 f 0.8 k 1.0 f 1.0 f 1.0 f 1.0 f 1.0 f 1.0 TABLE 1 Length and Width Tolerance of Cut Sizes mm f 2.0 f 2.0 f 2.0 f 2.0 f 2.0 f 2.5 f 2.5 f 3.0 f4.0 f 5.0 f 6.0 k 6.5 Light Transmittance Nominal % 90 9

48、0 90 89 88 87 87 85 85 82 81 79 Maximum Glass Sizes for Doors and Windows - Maximum glass sizes according to thickness for glazing doors or windows shall conform to the requirements of the National Building Code of Canada. Defects in Float Glass (par. 8.2) - Defects shall not be greater than those l

49、isted in Tables 2 and 3 for glass thicknesses 6 mm or less (par. 6.2 and 3.3). Glass of greater thickness than 6 mm may contain proportionately more and larger defects than 6 mm “Glazing Quaiity” glass of the same sizes as specified in Table 3. Glass over 6 mm in nominal thickness shall be furnished in “Glazing Quality”on1y. CAN/CGSB-123-M91 3 CGSB CAN/CGSB- L2.3-fl9L tt M L74b50 OOOLL90 2b2 M Defects Gaseous inclusions (0 TABLE 2 Silvering Qualiy Mirror Glazing Quality up to 2.5 m2 up to 2.5 m2 Centrai Outer Centrai (d) Outer (d) 0.5 mm (ad 1.0 mm 1.0 mm (ad) 1.0 mm (ad Central