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
2、t agency within the Federal Department of Supply and Services. CGSB is engaged in the production of voluntary standards in a wide range of subject areas through the media of standards committees and the consensus process. The standards committees are composed of representatives of relevant interests
3、 including producers, consumers and other users. retailers, governments. educational institutions, technical, professional and trade societies. and research and testing organizations. Any given standard is developed on the consensus of views expressed by such representatives. The Ministers Advisory
4、Council on CGSB reviews the results of the consensus process. CGSB has been accredited by the Standards Council of Canada as a national standards-writing organization. The standards that it develops and offers as National Standards of Canada conform to the criteria and procedures established for thi
5、s purpose by the Standards Council of Canada in addition to standards it publishes as national standards, CGSB produces standards to meet particular needs, in response to requests from a variety of sources in both the public and private sectors. Both CGSB standards and national standards developed b
6、y CGSB are developed in conformance with the policies described in the Policy Manual for the Development and Maintenance of Standards by CGSB. CGSB standards are subject to review and revision at any time, so as to ensure that they keep abreast of technological progress. Suggestions for their improv
7、ement, which are always welcome. should be brought to the notice of the standards committees concerned. Changes to standards are issued either as separate amendment sheets or in new editions of standards. An up-to-date listing of CGSB standards, including details on latest issws and amendments, and
8、ordering instructions, will be found in the CGSB Catalogue, which is published annually and is available without charge upon request, Although the intended primary application of this standard is stated in its Scope, it is important to note that it remains the responsibility of the users of the stan
9、dard to judge its suitability for their particular purpose. Many tesis required by CGSB standards are inherently hazardous. CGSB neither assumes nor accepts any responsibility for any injury or damage that may occur during or as the result of tests, wherever performed. CGSB takes no position respect
10、ing the validity of any patent rights asserted with any item connected with this standard. Users of this standard are expressly advised that deermination of the validity of any such patent rights are entirely their own responsibility. Further information on CGSB and its services and standards may be
11、 obtained from: The Secretary Canadian General Standards Board Ottawa, canada KIA 1G6 The STANDARDS COUNCIL OF CANADA is the coordinating body of the National Sandxds System, a federation of independent, autonomous organizations working towards the . further development and improvement of voluntary
12、standardization in the national interest. The principal objectives of the Council are to foster and promote voluntary standardization as a means of advancing the national economy. benefiting the health. safety and welfare of the public, assisting and protecting the consumer, facilitating domestic an
13、d intenuitional trade, and furthering international co-operation in the field of standards. A National Standard of Canada is a standard which has been approved by the Standards Council of Canada and one which reflects a reasonable agreement among the views of a number of capable individuals whose co
14、llective interests provide. to the greatest practicable extent, a balance of representation of producers, users, consumers and others with relevant interests, as may be appropriate to the subject in hand. It normally is a standard that is capable of malring a significant and timely contribution to t
15、he national interest. Appval of a standard as a National Standard of Canada indicates hat a standard conforms to the criteria and procedures established by the Standards Council of Canada. Approval therefore, users are cautioned to obtain the latest edition from the organization preparing the standa
16、rd. The responsibility for approving National Standards of Canada rests with the: standards uncil of canada 350 Sparks Street Ottawa Ontario K1P 6N7 How to order a Publications: by Telephone - (819) 956-0425 or - (819) 956-0426 by Fax - (819) 956-5644 by Mail - CGSB, Sales Unit Ottawa, Canada K1A 1G
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
