Glass made before the 1950s has a texture and reflection different to that of modern glass, as its imperfections reflect light at many angles. This was seen to be a minimum standard which most glass processing businesses would hope to improve ... scratches and other imperfections) for processed and cut to size glass. Diagram showing critical and viewing areas and edge zone Viewing area 1. BS EN 410: Glass in building - Determination of luminous and solar characteristics of glazing. insulating glass units constructed ... an example of the imperfections such as seeds and not indicate deterioration in the phenomenon known to physicists as bubbles are deemed to be ... physical performance of the toughened the interference of light. NOTE: Patterned Glass – the above criteria do not apply to patterned glass as, due to the method of manufacture, imperfections such as seeds, bubbles are deemed to be acceptable. in float glass, depending on glass … Small bubbles and imperfections are deemed acceptable due to the manufacturing process. BS EN 356: Glass in building – Security glazing - Testing and classification of resistance against manual attack. Colours of lead in these pages are for illustration purposes only, colour of lead must be specified when placing order. Different types of plain glass … The effect is acceptable. The case study below illustrates why this is important. 7.1 ROLLER WAVE DISTORTION An inherent consequence of the heat treatment process is roller wave which is caused by the heated, slightly softened glass being in continual contact with the oscillating ceramic rollers. Mirror guard is not a true mirror product and is subject to imperfections in reflective quality and in glass surface quality. All glass produced afterwards shall comply with the acceptable samples as a minimum standard. Open Box - Acceptable: Original UPC, the original jewel case, or both are missing. You likely have excellent eyesight, and you see the most likely acceptable imperfections in the glass you have. Common products used throughout the building industry include; • The application of a coating to the glass surface, i.e. 9 hours ago — Dan Schlenoff Disc may have marking greater than 1.5 cm but is … Sun Windows has adopted these standards as our baseline for determining acceptable glass in our window and door products. Imperfections such as seeds and bubbles are deemed to be acceptable. a standard for glass quality this standard was published as a flat glass industry guide to acceptable quality. or are considered acceptable imperfections per ASTM standards or Quaker’s Examining Glass Imperfections publication. The following form of words may be considered: ... Bespoke produced glass laminated in an autoclave is recommended instead of pre-laminated ‘stock sheets’. Scratches, scars, surface marks and imperfections are acceptable Note regarding altitude: Quaker provides no glass warranty for any installation over 3,500 feet above sea level (ASL) unless a factory installed capillary tube is properly utilized. Glass Defects Information Sheet Based on ASTM Designation: C 1036 - 16 These standards have been established by the ASTM to define the identification process and qualifications for defects in Flat Glass. Edge condition Appointed experts will examine the samples provided and reasonably advise what is acceptable and what is unacceptable. The glass is to be inspected in transmission (looking through the glass) at a distance of 3 metres at a viewing angle of 90° (perpendicular) to the surface and as normally viewed using daylight (not in direct sunlight) or other uniform di˜used background to simulate daylight. Glass imperfections must be visable at a distance of 3 metres at a perpendicular angle only to … Glass is meant to be looked through, not at. Scratches visible at 3 meters (10 feet), which are up to 75 mm (3 inches) in length shall be acceptable if within 75 2. This glass is intended to be used primarily for architectural glazing products including: coated glass, insulating glass units, laminated glass, mirrors, spandrel glass, or similar uses. When it comes to acceptable scratches, I think it depends on who your asking, the buyer or the seller of the glass. Factory installed insulated glass 6.3.2 Chatter marks are acceptable provided part meets drawing roughness re- quirement. IGU Vision Area - the area bounded by the IGU sightline (the surface of the spacer facing the air space) on all sides of the IGU. I really hope this response to your question helps in some way and thank you again for making contact with the Glass.com® Glass Detective. 6.3.1 Burrs are not acceptable, part found with burrs should be sent to MRB for dis-position. The cutting of stock sheets can lead to imperfections of the interlayer at the cut edge which can increase the GANA ID 02-0315 2 Figure 1 IGU Edge Cross Section Insulating Glass Unit (IGU) Sightline Dimension - the measurement from the edge of glass to the visible surface of the spacer (Figure 1). BS EN 572: - Glass in building - Basic soda lime silicate glass products. Dave Desai - … Acceptable Glass Defects - All glass contains various types of flaws or blemishes, and when fabricated, the glass will most likely have hairline and light scratches, and other imperfections that may be noticeable at close range. Reflective quality is excluded from any defect or warranty claim. Scratches and sleeks not visible from 2 meter viewing distance acceptable. Anticipated imperfections are often be demonstrated by the provision of these samples prior to the start of glass production. Being the industry authority, the GGF promotes best practice and helps shape the highest technical and health & safety standards. All sizes shown are the minimum glass size required, width (mm) x height (mm) Glass sizes with * * around them are fixed sizes. Used - Acceptable :Original UPC, the original jewel case, or both are missing. laminated glass, may show a distortion effect caused by reflection on the multiple surfaces of the components of the laminated glass. 1.Transparent glass used in the manufacture of insulating glass units is ... of manufacture, imperfections such as seeds and bubbles are deemed to be acceptable. already seen the glass… and decided it is not acceptable to their personal expectations.” Anyone can find imperfections in glass if they look close enough and hard enough. Standard Test Method for Young's Modulus, Shear Modulus, and Poisson's Ratio for Glass and Glass-Ceramics by Resonance: C657 - 19: Standard Test Method for D-C Volume Resistivity of Glass: C693 - 93(2019) Standard Test Method for Density of Glass by Buoyancy: C729 - 11(2016) Standard Test Method for Density of Glass by the Sink-Float Comparator Below you'll find a list of all posts that have been tagged as “imperfections in glass ... “It’s much more difficult to explain expectations around industry standards once the Owner has already seen the glass… and decided it is not acceptable to their personal expectations.” As we’ve mentioned before in … Architectural Glass that is produced as Annealed, Tempered, non Low-E Insulated, or Laminated SCRATCHES AND RUBS EPE Work Instructions Title: Date Issued:06/29/10 Document Number WI190-004 Revision A Page 7 of 18 FRM 120-007 Rev I/R 5.1 Texture: 5.1.1 Molded texture specs are the default plastic textures adopted by EPE Corporation. Surface imperfections in their approximate order of importance based on the imperfection type and its effect on casting serviceability are now discussed: a) Cracks in castings appear as tight, linear separations in the material that are continuous or intermittent. Glass is a manufactured product made using a highly industrialised process which has tolerances and naturally occurring imperfections. As a glass decorator we do incoming inspections on all bottles coming into our facility and will reject on behalf of our customers. This manufacturing process is standardised across the world whether to BS EN, AU/NZS or ASTM or other local codes the “standards” are what the manufacturers work to and will guarantee. Operators, however, must be periodically trained and qualified on when to visually inspect clean equipment and how to distinguish between product residue and surface imperfections that may impact the visually clean criteria. Linear Blemishes – scratches, scrapes and other similar imperfections Scratches of up to 75 mm (3 inches) in length shall be acceptable if they are not visible at a distance of 3 meters (10 feet). Low E glass. The monolithic flat glass shall be supplied as cut sizes or stock sheets. Surface imperfections that have an adverse effect on Form/Fit/Function are not acceptable. SURFACE IMPERFECTIONS All inspections are done with the viewing angle at 90 degrees to the glass surface, uniform diffused lighting that stimulates daylight, and with the inspector looking thru rather than at the glass surface. Nickel-sulfide stones are quite small and their occurrence in the final glass product is covered under ASTM C1036, Standard Specification for Flat Glass, which permits blemishes (including nickel-sulfide particles) of between 0.5 and 2.5 mm (1/50 to 1/10 in.) Cracks are not acceptable. Variability in practices between manufacturers is acceptable. glass. dimensions of the glass panel. Glass made using this process is extremely flat, however can contain some imperfections. b) not acceptable. acceptable. As far as who should be responsible for the glass replacement, the builder must determine who is responsible for the scratches in the glass and hold them accountable for the replacement costs. 50, 100 & 150 Years Ago: February 2021. Pilkington K Glass™ OW Datasheet 2010 Glass Range Brochure BR Part L 2010 - Bulletin 10 Bulletin 11 Scotland Section 6 Safety/Security Glass Brochure Pilkington Optilam™ Brochure European/British Standards and Codes of Practice It is a fact worth repeating because few things cause more of a Dave, if you have specific concerns about a shipment of glass you received, you can give me a call and I'll be glad to share my experience. Note: Patterned glass – the above criteria does not apply to patterned glass, due to the method of manufacture. Glass is not perfect. Glass in glazed curtain walls, glazed storefronts and glazed partitions shall meet the seismic requirements of ASCE 7, Section 13.5.9. Disc may have marking greater than 1.5 cm but is in great working condition. The raw float glass is converted into the end product through a range of processes; cutting, edge working, shapingand/or . Cracks may be jagged or straight. Scratches, scars, surface marks and imperfections are acceptable if not readily visible from the viewing distance. Another of its characteristics is the way in which traditional glass slightly distorts the view beyond the window. Just as we as humans are not perfect, neither are the things we humans make. Glass sloped 15 degrees (0.26 rad) or less from vertical in windows, curtain and window walls, doors and other exterior applications shall be designed to resist the wind loads due to ultimate design wind speed, V ult, in Section 1609 for components and cladding. 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