Talk:Architectural glass

Photos

This page needs the existing photos replaced with photos of the glass types discussed in a construction/building/architectural situation.

Parasite 02:50, 3 May 2006 (UTC)

Auto glass?

There seems to be absolutely no discussion about safety glass used in automobiles, even though the page redirects here....(unsigned)

I don't know the date of the above comment, but I also got to this topic via "safety glass". I found auto glass under Laminated Glass (windshields) and Tempered Glass (side/back windows); seems ok, albeit somewhat buried. Dwight666 16:30, 18 March 2007 (UTC)

This article is about Architectural glass. The discussion of the use of such glass in Automobiles is incidental to the article. Someone perhaps should write ann article dedicated to the types of glass used in automobiles, specifically.--Amandajm 01:30, 12 May 2007 (UTC)

I also got here via Safety glass. It was pretty disorienting because I was expecting to see automotive safety glass. My first thought was to add a link to laminated glass at the top. So I think I will do that, since even though laminated glass is covered later in the article, a user shouldn't have to read through this article to get the one they want. There may be a better way to do this but this seems like a good immediate solution for now. Spalding (talk) 21:54, 26 May 2010 (UTC)

Tempered Glass?

The information here wasn't necessarily wrong, but it was very general with lots of ambiguities. I added a little information but there are so many different possiblities for laminated glass and I don't really have time to write and entire article.Lainyg (talk) 18:03, 10 August 2009 (UTC)

There may be one type missing

I came to this article looking for information on a type of architectural glass that can be identified only when it is struck by a projectile (rock, hammer, bullet, whatever). When struck by a point object, the glass spalls, ejecting a flattened cone from the other side (the cone has an obtuse apex angle, 120° or so). This is one-way behavior; if struck from the other side, the glass doesn't spall, but just cracks.

I have seen this glass in the lobby windows of an industrial building (with a couple bullet holes in it), as well as some wire-reinforced glass in the doors of an apartment building (at which someone had thrown a rock). In all cases one finds a broad cone-shaped hole in the glass, with the apex of the cone on the impact side.

After reading this article, I still don't know what it is. I would like to learn about the process used to create the spalling behavior; I have an application in my job where this spalling is actually useful. =Axlq (talk) 01:16, 7 February 2008 (UTC)

Update: the spalling I described is called a Hertzian cone crack. I'm pretty sure I've seen glass that does this in one direction, although the sources I can find don't indicate any directional dependence. =Axlq (talk) 01:34, 7 February 2008 (UTC)

I can't find the example I'm looking for but these show conically radiating lines from the impact of flaking.

I've observed it, in both windows and flakestone tools. In flakestone tools, you need to have a stone with glasslike properties to achieve it. Obsidian is the ideal stone of course, and obsidian was one of the most traded commodoties in Neolithic times. Only some stone tools are proper flakestone tools. Otheres are ground or chipped but not pressure flaked. The stone is made into a toolshape by knocking chips off using another rock as a striker. When the tool is roughly arrowhead or knife shaped, then you take a pointed implement which is hard, but can be softer than the stone, like a piece of bone, or hardwood with a sharply pointed end. Then you use it after the manner of a chisel. It is set at a slight angle to the surface and given a sharp tap so that the whole force of the blow impacts on a single point. The piece of stone will fly off, leaving a curved indent which is part of a shallow cone. You repeat this all along the edge of the tool on one or both sides and you end up with a scalloped edge that is very sharp. Some of the most beautiful objects remaining from prehistoric times are flakestone tools.

The Australian Aboriginal people made flakestone tools in some regions until quite recently. (In other places the flakestone tool industry seemed to have died out.) The Australian Museum in Sydney holds a couple of splendid examples made in the Northern Territory from broken bottles. Amandajm (talk) 15:40, 9 February 2008 (UTC)

Query on definitions

Rolled-plate - the definition here appears to be referring to cast-plate, invented by James Hartley, c.1848. BTW, this process very narrowly missed out as being the glass used to glaze the Crystal Palace.

Figured glass - this is just another term for rolled-plate (as is 'Cathedral' glass), but rolled-plate is the more acceptable term used within the industry.

Crown Glass - was not the earliest form of window glass, but I think Broad Sheet glass predates this to medieval times. I believe this process involved pouring molten glass onto a plate, which was then pulled from the corners with pincers into a rough rectangular shape. An early form of casting. GlassyEye (talk) 13:51, 8 July 2009 (UTC)

Can you possibly source your info and make corrections. Amandajm (talk) 05:45, 9 July 2009 (UTC)

One source is http://www.londoncrownglass.co.uk/History.html - but I suspect the term 'Broad Sheet' used here is incorrect. I have other sources which I will check (sorry for delay in responding) and suspect a form of cast glass (simply poured onto a flat sheet) might be the earliest process. However, I have just located a source within Wikipedia itself - http://en.wikipedia.org/wiki/Glass

Here it quotes, It was the Romans who began to use glass for architectural purposes, with the discovery of clear glass (through the introduction of manganese oxide), in Alexandria ca. AD 100. Cast glass windows, albeit with poor optical qualities, thus began to appear in the most important buildings in Rome and the most luxurious villas of Herculaneum and Pompeii. Over the next 1,000 years glass making and working continued and spread through southern Europe and beyond. I have paraphrased this for the purpose of the article. —Preceding unsigned comment added by GlassyEye (talk • contribs) 09:45, 2 September 2009 (UTC)

However, there other anomalies: I think the term Sheet glass as used in the article is actually describing the Fourcault Flat Drawn Sheet (or just Flat Drawn), developed in c.1890s by the Belgian Emile Fourcault - see Wiki article on Fourcault process. Sheet Glass is the process where a cylinder is blown, drawn, split and flattened as developed by the French and imported into the UK by Chance Brothers, so this is a possible confusion between 'cylinder drawn' and 'drawn sheet'. See http://www.pilkington.com/pilkington-information/about+pilkington/company+briefing/company+history/1826+-1950.htm for more concise details. —Preceding unsigned comment added by GlassyEye (talk • contribs) 10:07, 2 September 2009 (UTC)

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But what's just "plate glass"? Or even "rolled plate glass"?

The section "Cast Plate Glass" says that the process is "similar to that employed in making plate-glass, but on a smaller scale". Which process is that referring to? Is it listed here? It doesn't seem to be.

The next section, "Polished plate glass", says that it "starts with sheet or rolled plate glass". Is "rolled plate" the same as "Cast Plate Glass"? Does "sheet or rolled plate" indicate that "sheet" and "rolled" are synonyms, or does "sheet" refer to the section titled "Drawn Sheet glass (Fourcault process)"? I shouldn't be having to guess at this stuff, and struggling to piece the answers together, like it was the world's most tedious detective story. The article should just use consistent names throughout (and make sure every process mentioned is listed).

Then there's the section "Rolled plate (figured) glass", which unsurprisingly says it's "produced in a similar fashion to the rolled plate glass process". So, again, that might be the same process previously called "Cast Plate Glass", which mentioned rollers - or it might not be, since it's given a different name, but there's no other process mentioned that even slightly matches.

These different categories of glass are not at all clear.  Card Zero  (talk) 22:41, 30 March 2017 (UTC)

Heat-strengthened glass section contradicts itself

The section on heat-strengthened glass makes no sense. The first sentence says this glass is also called tempered glass, then goes on to say it has properties different from tempered glass. Which one is correct? Jasmine093 (talk) 04:55, 21 October 2022 (UTC)