Talk:Borosilicate glass

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Melting point[edit]

Hi Alex, sorry to correct your sentence again, but the heat resistance of borosilicate glass is definitely not generated from its "higher melting point". Actually glass doesn't have any such thing as a melting point. Also borosilicate glass doesn't even have a higher softening temperature than conventional soda-lime glass. The main advantage is the low thermal expansion coefficient. It makes borosilicate glass less sensitive to thermal gradients and thermal shock. Regards, Herbert

The mixture as a whole has to be heated to a higher temperature before it liquefies to the point that it can be shaped; Corning had to develop new forges that could produce and withstand 1000 C. I'm not mischaracterizing the nature of the glass, it was a major engineering challenge to mass-produce in the early days. --Alexwcovington (talk) 12:42, 19 Feb 2005 (UTC)

P.S. As a side note I would advise registering a username or logging in so your work and comments can be properly attributed.

I see there are two more reverts here now. Can the anon user please post here with sources stating reason for his/her reverts? Inter 12:56, 19 Feb 2005 (UTC)

I apologize for my overzealousness. I mistakenly believed at the time of the edits that it was the melting point that was the major difference; indeed the melting point of Pyrex is about 821 C [1], much lower than a typical glass, well over 1000 C [2]. By examining sources here [3] for a more typical glass (0.672 J / g * cm3), [0.161 *4.18]) and here for borosilicate [4] (0.753 J / g * cm3), I see a significant difference in heat capacity. It is possible that Corning needed the new forges to allow for mixing at the desired consistency, and maybe to overcome the added heat resistance, though I'm less confident of that now.
Modifying article thusly. --Alexwcovington (talk) 06:50, 27 Feb 2005 (UTC)

The confustion comes from soda lime glass, which I am supposing is not normal window pane glass. Soda lime glass has a definitly lower melting point. Indolering

Looks like somebody knows, so howcum the melting temp (which I understood Pyrex was developed for) isn't mentioned? Trekphiler 00:47, 10 November 2006 (UTC)

Merge of bomex, kimax and pyrex articles[edit]

Lacrima97: It doesn't matter if the bomex section is merged, but if it is, pyrex and kimax should also be merged. They are all different brands, and i know that i really needed the information I posted about bomex, so just do what you wish with it, as long as the facts are known. —The preceding unsigned comment was added by (talkcontribs) 01:12, 4 January 2006 UTC.

Makes sense to merge them (IMO) as long as we setup redirect pages from Pyrex, Kimax, and Bomex into Borosilicate glass. Marius 21:38, 21 January 2006 (UTC)

I concur; I'd like to see all three merged in, with the appropriate redirects. --moof 03:50, 6 March 2006 (UTC)

It is VERY TRUE, all these brands of glass are nearly the exact same glass, just brands. Why would be have a different article for each brand of ketchup? —The preceding unsigned comment was added by (talkcontribs) 16:42, 16 June 2006 UTC.

It is not advisible to enclude the two trade names as part of borosilicate, as borosilicates are a type of glass denoted due to the % of Boric oxide present used as a flux. The companies only wish to add their trade names as a marketing exercise. There are 1000's of compositions manuafctured that come under the unbrella of 'Borosilicates' should they all merge pages?? The only company who truely could have a claim to merge is 'PYREX' teh original trade name asscoiated with the formulation of a borosilicate type glass. Furthermore the main attribute of borosilicates is not only the thermal expansion, but moreso that these glass types are hydrolytically stable, offering excellent chemical resistance (except HF of course)as apposed to most other glass types. Simon Brigham

I'm against merging the Pyrex article with this one. It has become fairly developed, including information specific to the brand name, and deserves its own article. It might make sense to transfer some of the information from that article to this one, though. -- Heptite (T) (C) (@) 16:50, 22 October 2006 (UTC)

I support merging in Kimax and Bomex to here, but not Pyrex. Pyrex, like Kleenex, is a genericised trademark, and so by our guidelines deserves its own article. The others, on the other hand, are not notable enough to warrant their own articles. Besides, the Kimax and Bomex articles as written say nothing that is of note that isn't said in this article. — Saxifrage 20:48, 22 October 2006 (UTC)

Other uses[edit]

It should just say dildo instead of other uses - some people might click on it whilst having a parent watching and it could lead to quite an embarrising conversation.

From Todd A. This article should discuss use of borosilicate glass in the nuclear industry. Boron is a good neutron absorber, which is helpful for preventing unwanted nuclear criticalities (chain reactions in which enough neutrons that are released when atoms fission in one generationstick around and create the same amount - or more (supercriticality) - fissions in the next generation). This is something that is useful in manufacture of nuclear fuel (e.g., highly enriched uranium) or in storing or disposing nuclear waste that has enough fissile material to sustain a nuclear reaction (okay, that's a bit simplified). Here are a couple of uses: 1) Raschig Rings ( facilities that manufacture nuclear fuel often put them in vacuum cleaners that are used to vacuum up spills; 2) stabilizing defense nuclear waste that contains plutonium-239 or other fissile material (e.g. U-235): take a stainless steel cylinder, pour in powder waste & borosilicate glass powder through electrodes that heat it up (at the same time) and presto, very stable glass log encased in highly corrosion-resistant material. I recommend not using the latter as a dildo. Anyway, a good google search could find you all sorts of references. I leave it to the owner of the page138.162.8.58 (talk) 18:06, 18 December 2009 (UTC)Todd A.

Under radioactivity there is a "citation needed" for this glass being used to hold radioactive waste for centuries. This is clearly false since this glass tpye has not been around for centuries. —Preceding unsigned comment added by (talk) 13:30, 26 April 2011 (UTC)

Moving general borosilicate info here from Pyrex[edit]

I'm not sure about merging, but certainly now that "Pyrex isn't pyrex" (heh) it would make sense to move the general borosilicate chemistry info from the Pyrex article in here. Chris Cunningham 11:16, 16 February 2007 (UTC)

Done. Chris Cunningham 10:51, 14 March 2007 (UTC)


I want someone to help telling me how can I say "Borosilicate glass" in spanish for the translation.

Maybe I can type "Vidrio borosilicato" or "Vidrio de borosílice", but I´m not sure about the correct form. Damërung 13:03, 12 May 2007 (UTC)


Can some knowledgeable soul please add a section explaining to what degree imperfections in borosilicate products (such as air bubbles, chips and cracks) affect their safety and usability for heating, vacuum and pressurization? Information on this is hard to find, and contradictory at best. Some people say an air bubble will cause a borosilicate piece to explode when heated or subjected to vacuum/pressure, others say it doesn't do anything. Same thing for chips. It'd be nice to have the correct answer available in WP for easy access. 23:31, 5 August 2007 (UTC)

Manufacturing process[edit]

Is the reference to silicate glass correct? shouldn't it be soda-lime glass? Axiosaurus 15:26, 24 September 2007 (UTC)

Usage: conflict with another article[edit]

3rd to last paragraph in "usage" section says "Borosilicate glass is not used for high quality lenses due to striations and inclusions common to this type of glass."

BUT article "Crown glass (optics)" says "the borosilicate glass Schott BK7 is an extremely common crown glass, used in precision lenses."

Will some expert kindly resolve this conflict???

Perhaps something like: "Most borsosilicate glasses are not used ... but some (e.g., Schott BK7) are made well enough for such use." —Preceding unsigned comment added by (talk) 03:13, 15 November 2007 (UTC)

Resolved: This now includes mention of BK-7 and similar types of borosilicate optical glass, and B270 and similar but less expensive types of borosilicate glass for eyeglasses. You can buy borosilicate in any grade required, from exceptionally fine melts of special BK-7 to very cheap industrial grades. -Rstevec —Preceding unsigned comment added by (talk) 05:07, 21 November 2007 (UTC)

Is the "Schott Duran" glassware borosilicate glassware?[edit]

Does anyone know? If it is not then it is not related to this article and should be removed. If it is then it should be captioned as "borosilicate glassware, here displayed two beakers and a test tube" not "Schott Duran glassware, here displayed two beakers and a test tube". Can anyone confirm if they are borosilicate or not? Sean.barton (talk) 00:20, 8 February 2008 (UTC)

Probably it must be borosilicate. I don't see why it would be added to the article if it were not. I'll change the caption, but if I am wrong someone please correct it. Sean.barton (talk) 20:09, 14 March 2008 (UTC)

Pyrex use of soda lime since 1998 question[edit]

The article currently states that the US mfr of Pyrex has been using soda lime since 1998; however, the ref provided does not mention any date of when soda lime was introduced, and this recent article suggests that the switch actually occurred in the mid 1940s. Also, not sure if it's worth mentioning the "exploding" bit... OhNoitsJamie Talk 14:03, 23 September 2009 (UTC)

Error in section "Composition and physical characteristics"[edit]

" . . . at this temperature, the viscosity of type ?? Pyrex is ?? poise.[4] . . ." contains an error. The question marks may need to be removed or replaced with their intended character(s).Ntlhui (talk) 22:50, 4 October 2009 (UTC)

"Reagent Bottle" Entry Created - Please Add![edit]

I just created the entry for Reagent bottle. If you have more useful and knowledgeable information, please do add it. Radical Mallard (talk) 16:54, 6 July 2010 (UTC)

Diagram please[edit]

How about a diagram of typical structure? I'd like to know how the boron and silicon interconnect (if they do). Also some indication of how this structure makes for lower thermal expansion. Thanks. JKeck (talk) 18:25, 30 October 2010 (UTC)

Inconsistent link to Swiss University[edit]

In the section "Borosilicate nanoparticles," the link indicates it is to the Swiss Federal Institute of Technology at Lausanne (École Polytechnique Fédérale de Lausanne)

However, the link actually goes to the Swiss Federal Institute of Technology Zurich

I don't know which university conducted the research described in the paragraph, but it appears that either the name in the text or the link needs to be changed. Pddentremont (talk) 16:50, 22 November 2011 (UTC) PcGnome (talk) 00:37, 24 September 2012 (UTC) PcGnome (talk) 00:38, 24 September 2012 (UTC) PcGnome (talk) 00:39, 24 September 2012 (UTC) PcGnome (talk) 00:42, 24 September 2012 (UTC)

traducción[edit] (talk) 20:16, 23 September 2012 (UTC)

Dan Eister[edit]

I've just removed the following text from the article since it is not notable, does not contribute usefully to the article and is probably a personal advertisement (it had been added by an IP user). If it is felt to be notable enough by more than one editor maybe a page can be started for Dan Eister but I don't think it belongs on this page.

"Dan Eister is the first lampwork bead maker to put a full color line of borosilicate beads on the table at any bead trade show. He did this after discovering boro color created by Paul Trautman who started Northstar. [1] It happened in 1999 at Embellishment in Portland Oregon. Dan Eister was also one of the featured artists in a book published by Schiffer in 2001 and authored by Mark P. Block called " Contemporary Marbles and Related Art Glass ".[2] Dan is the first to use Dichroic made by " Coatings by Sandberg " in a borosilicate marble that he developed in honor of his stepfather John Bowen a Geologist. Dan's idea was to create a marble that was his version of a geode.[2] "

Loganrah (talk) 00:32, 3 December 2012 (UTC)

Actually, it had been added by Dan Eister (talk · contribs) as you can tell from this diff: [5] -- (talk) 21:54, 3 December 2012 (UTC)

It appears to have been added once again. This "Dan" is quite persistent. I have removed the apparent self-advertisement. (talk) 07:18, 31 December 2012 (UTC)Mal

Borosilicate Glass Physical Properties[edit]

From reading the Wii article I get that there are different formulations of borosilicate glass. Is it still possible to list some of the physical properties though, maybe in range format, such as hardness, optical clarity, softening point, etc. ? (talk) 10:18, 16 October 2013 (UTC)BeeCier

External links modified[edit]

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Guitar slide picture doesn't look like a guitar anything. Looks more like a beaker.[edit]

The image and image comment don't make sense. — Preceding unsigned comment added by (talk) 23:14, 12 June 2018 (UTC)

3d printing[edit]

The selection of borosilicate glass for FDM 3d printing is exaggerated. This may have true a couple years ago, but flexible build plates of spring metal with a proprietary coating have become the defacto standard. Glass build plates generally never came prepackaged with 3d printers and were only used by hobbiests to replace unsuitable build surfaces. These were also generally whatever was available and most likely not borosilicate glass because the thermal properties of soda lime glass is more than sufficient for the relatively low temperature of FDM printing. Also, borosilicate is generally not available in flat plates to the general consumer. To make matters worse, the description if the FDM process is in error. Build plate temperatures can vary widely, but rarely need to exceed 100x. In short this entire section is inaccurate and does not belong on this page. A simple statement saying that borosilicate glass may be used as a build plate coating with a link to 3d printing would be more appropriate. Nuke Sam (talk) 19:23, 4 August 2018 (UTC)

Correction, the did come prepackaged with 3d printers as the installed build plate for printers such as makerbot replicator 2+. Still this discussion doesn't really belong in this article. Nuke Sam (talk) 19:28, 4 August 2018 (UTC)

  1. ^ Bead and Button magazine, issue #44, August 2001, article " STRING QUARTET "
  2. ^ a b Mark P. Block, "Contemporary Marbles and Related Art Glass", Schiffer, 2001