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Is acrylic glass the same as bullet resistant glass? There are a number of bullet resistant levels. Class I and II can be achieved with special acrylic products. Plexiglas product offering includes Plexiglas SB I and II, coated and uncoated for abrasion resistance. Both products are produced through a cell cast process achieving bullet resistant grade without requiring a lamination of any kind. There are other options manufactured by other acrylic manufacturers. ( EMILIOJPEDRAL ( talk) 00:23, 9 July 2008 (UTC)) Acrylic glass can also be a component of bullet resistant glass. It is laminated in between mineral glass or as the inside layer of such a laminate to protect the inside from shattered glass. Is there a reference for the use of acrylic for riot control vehicles? 212.23.103.110 ( talk) 15:58, 20 January 2008 (UTC)
Is it sold in the US as 'Plexiglas' or 'Plexiglass'? Currently only the double-s version redirects here. Psmith 22:21, 13 Oct 2003 (UTC)
I understand that glass does not permit transmission of Infra Red. What about Plexiglas?
Where did the name "Perspex" come from? I had always thought it, like "Plexiglas(s)", was a trade name, but the article suggests otherwise. And is "perspex" really the most common name? I've most often heard it called just "acrylic", or PMMA (polymethyl methacrylate, I believe) in organic chem. — Danc 11:37, 10 Jul 2004 (UTC)
As far as the USA is concerned, Perspex is a registered trademark now owned by LUCITE INTERNATIONAL UK LIMITED (originally registered by ICI). 76.110.165.21 ( talk) 02:52, 8 November 2008 (UTC)
"PMMA does not shiver". What does this mean? Graham 00:09, 26 Jul 2004 (UTC)
Is there any online information or even printed material on how this material is used, kind of a practical guide to designing and making things with perspex?
The SMILES string seems to display only the monomer, correct? Should it nevertheless remain in the table? Why is one of the C's in square brackets? AxelBoldt 23:51, 13 March 2006 (UTC)
Could anyone describe the toxicity of polymethyl methacrylate in common modern environmental situations, for example: 1) consumption of water that has had contact with Plexiglas 2) consumption of water that has had contact with heated Plexiglas 3) at which temperatures does Plexiglas begin to off-gas toxic chemicals
In particular, i am trying to determine the usefulness of this material in making #REDIRECT solar cookers, which involves potential contact with food and high temperatures (200C). [End of unsigned comment.]
The temperature that you are trying to use the Plexiglas at is too high and it will deform the material, however the residual monomer in the material will not be harmful. Consider that there are FDA approvals for Plexiglas, you can contact tech specialists at Arkema Inc/ Plexiglas Webpage. ( EMILIOJPEDRAL ( talk) 00:27, 9 July 2008 (UTC)) Emilio Pedral.
The article asserted that plexiglas was first brought to market in 1928 by "the German company Röhm". I think this is incorrect, and that the company that was meant here was actually Rohm and Haas. If so, the name was certainly incorrect, because (a) it omitted Haas, who was a company founder and whose name has always been in the name of the company, and (b) Rohm is not spelled with a dieresis. But my correction could be mistaken, if what was really meant was a German company named Röhm. -- Dominus 18:46, 30 March 2006 (UTC)
Note also that:
So if one wants to attribute the material to its inventor, one could say that it was invented by Röhm. But if one wants to attribute the material to the company, one could say that it was brought to market by Rohm and Haas.
See for example the official company history of Rohm and Haas. -- Dominus 18:53, 30 March 2006 (UTC)
Also note that Rohm and Hass in America is no longer manufacturer of Plexiglas and that these PMMA resins and sheets are currently produced by Arkema Inc. through it's Altuglas International Division. Plexiglas Webpage. ( EMILIOJPEDRAL ( talk) 00:22, 9 July 2008 (UTC))
I see two things that bother me about this entry. The first is in the properties table, where a melting point is listed, although PMMA is known to be amorphous - that is why it is also transparent. Only highly isotactic & syndiotactic PMMA will crystallize and therefore melt.
The second is the statement, that PMMA can be easily formed, by heating to 100C. Heating what to 100c? I assume the monomer, methyl methacrylate (MMA).
Matijac 20:06, 4 April 2006 (UTC)
Is plexiglass really shatter proof because from what I can tell it does shatter. I can show you links to news reports of people being sent to the hospital in a hockey game recently.
155.33.109.148 00:28, 12 December 2006 (UTC)
There should be some sources cited for the large amount of material in this article... Valrith 21:52, 5 October 2006 (UTC)
You can get much more information by downloading the PDF file related to the Physical Properties of Plexiglas Plexiglas PDF's ( EMILIOJPEDRAL ( talk) 00:32, 9 July 2008 (UTC)) Emilio Pedral.
I have never ever heard anyone refer to PMMA as acrylic glass. Some people will refer to it as Acrylic while most simply refer to it by the particular brand name of the polymer in use, or when talking about the resin in general its usually just called PMMA. Does anyone know of an industry that uses the term acrylic glass? I am a plastics engineer and I've not heard it refered to by this name before, but it may be a case of regional differences. I'd like to get some feedback before considering making a change to the title of the article. CoolMike 15:57, 21 November 2006 (UTC)
Plexiglass shatters. It happens all the time in hockey rings in fact it happened just recently. 155.33.109.148 00:26, 12 December 2006 (UTC)
I added the Tg and Young's modulus. These came from Introduction to Physical Polymer Science. L. H. Sperling, 3rd ed., Wiley-Interscience, New York 2001. I don't know how to cite these in the infobox. If you feel that this citation is important, please feel free to cite it. User:carsonc 16:04, 14 December 2006 (UTC)
I'm a moderator on a watch collector's forum, and discussion about acrylic watch crystals comes up all the time. I've added a new paragraph to the "uses" section.
Also, as my wife is studying to be an optometrist, she pointed out that hard contact lenses are no longer made with acrylic, so she edited that section as well. —The preceding unsigned comment was added by 69.203.82.86 ( talk) 02:04, 12 May 2007 (UTC).
I can not find information about UV-proofness of PMMA. Does anybody have data about capability to stand UV radiation and how is it to compare with PC and PS? Tiit tiitk@msn.com —Preceding unsigned comment added by 62.65.35.22 ( talk) 08:16, July 17, 2007
I came here today to study the differences between cast vs. extruded acrylic. I created a project out of scrap pieces from the shop where I work (I'm in a different department so I'm not 100% familiar) only to discover that I've used two different types of acrylic and they have very different characteristics. Yet the only reference I can find in this article is that the extruded form is used in pressurized aircraft. Nothing else seems to be mentioned on the subject. Compare this with the vast array of information about how different types of glass is manufactured. —Preceding unsigned comment added by 75.162.104.28 ( talk) 18:40, August 1, 2007
If someone would be so kind as to add this new interesting product to the Other Uses. A proposed terabyte capacity optical media disc. Currently stores between 600 to 800 gigabytes. [1] Axion22 16:17, 23 August 2007 (UTC)
At the end of the Properties section:
"To produce 1 kg of PMMA, about 2 kg of petroleum is needed. In the presence of oxygen, PMMA ignites at 460° C and burns completely to form only carbon dioxide and water."
Does "in the presence of oxygen" mean in air? Or does it have to be a pure oxygen atmosphere, otherwise there are other products? This point is unclear from the sentence as it stands.
WikiReaderer 14:28, 30 September 2007 (UTC)
Well first of all, temperature is given, 460 °C, and how about we go with atmospheric pressure...it just makes sense, and enough oxygen to complete the combustion reaction? The might be just any oxygen at all, but why is this even a big deal? 24.164.75.68 ( talk) 21:04, 10 June 2008 (UTC)
I agree that it is not an important point to make. While we're at it, why not include relative humility, wet-bulb temperature, etc etc. It is clear enough as it stands because it simply implies that combustion needs to take place in the presence of oxygen. AnimeEd ( talk) 04:38, 17 June 2008 (UTC)
I disagree on the "only" carbon dioxide and water: it depends on the factor we have seen here and more. —Preceding unsigned comment added by Bonarda ( talk • contribs) 21:01, 12 November 2008 (UTC)
Poly(methyl methacrylate) (with the parenthesis) is bolded in the article, but gives a red link. As does Limacryl, R-Cast, Plazcryl, Acrylex, Altuglas, and Polycast. Acrylic is bolded, but actually directs to a disambiguation page. -- 128.104.112.85 ( talk) 20:36, 8 April 2008 (UTC)
This does not really have to do with the article but I want to ask a question of the experts. I did some research on the Internet but with only limited answers. I have just installed two 2' x 4' pieces of plexiglas on top of a container that I want to get hot. It will be a solar water heater. It must have got hot because I noticed that the plexiglas has shrunk a bit. There is now about a 1/8th inch gap between the two pieces. According to various sites it begins to shrink at about 180 degrees F. My question is will it continue to shrink or after a period of time can I expect that it has finished shrinking and I can bring the two pieces together again and fasten them down and join them together? Conversely, will it expand or break when it gets cold out (it can get to about 10 degrees F here in the winter)? Thank You. 4.246.200.226 ( talk) 02:28, 4 August 2008 (UTC)
I added 'Plexiglas' as a common name for acrylic glass because this is how we named this product the most commonly here in Europe. I didn't know until I read the article it was a trademark name ! Lvr ( talk) 11:21, 5 December 2008 (UTC)
I like the article and enjoy all the effort everyone's put into it. However, it seems to be a combination of two articles that need to be split. There is some good generic information on acrylic glasses in the article, but by far the majority of the article focuses on one specific example: poly(methyl methacrylate). Acrylic glass is such a generic term for PMMA, it is similar to putting the Wikipedia entry for Tiger under the title Feline. PMMA needs its own article, and the terms PMMA and poly(methyl methacrylate) should not redirect here. I propose moving this article ASAP, so I'm posting this here for some discussion time before any move. Thoughts? Hokiesvt ( talk) 19:16, 26 March 2009 (UTC)
Simple question, can it be done? multiple somewhat confusing statements above in the "...100c" discussion. I'm starting a project to make visors and face shields for a set of movie props and found a product that is "semi-transparent film of aluminum deposited on an acrylic substrate" Thus the question: Can it be vacuum formed? Nullexe ( talk) 21:58, 18 November 2009 (UTC)
"Can PMMA be heated to a point where it will become malleable and useful for vacuum-forming applications, without losing cohesion completely or separating into other compounds?" Nullexe ( talk) 22:54, 18 November 2009 (UTC)
![]() | This page is an archive of past discussions. Do not edit the contents of this page. If you wish to start a new discussion or revive an old one, please do so on the current talk page. |
![]() | This page is an archive of past discussions. Do not edit the contents of this page. If you wish to start a new discussion or revive an old one, please do so on the current talk page. |
Is acrylic glass the same as bullet resistant glass? There are a number of bullet resistant levels. Class I and II can be achieved with special acrylic products. Plexiglas product offering includes Plexiglas SB I and II, coated and uncoated for abrasion resistance. Both products are produced through a cell cast process achieving bullet resistant grade without requiring a lamination of any kind. There are other options manufactured by other acrylic manufacturers. ( EMILIOJPEDRAL ( talk) 00:23, 9 July 2008 (UTC)) Acrylic glass can also be a component of bullet resistant glass. It is laminated in between mineral glass or as the inside layer of such a laminate to protect the inside from shattered glass. Is there a reference for the use of acrylic for riot control vehicles? 212.23.103.110 ( talk) 15:58, 20 January 2008 (UTC)
Is it sold in the US as 'Plexiglas' or 'Plexiglass'? Currently only the double-s version redirects here. Psmith 22:21, 13 Oct 2003 (UTC)
I understand that glass does not permit transmission of Infra Red. What about Plexiglas?
Where did the name "Perspex" come from? I had always thought it, like "Plexiglas(s)", was a trade name, but the article suggests otherwise. And is "perspex" really the most common name? I've most often heard it called just "acrylic", or PMMA (polymethyl methacrylate, I believe) in organic chem. — Danc 11:37, 10 Jul 2004 (UTC)
As far as the USA is concerned, Perspex is a registered trademark now owned by LUCITE INTERNATIONAL UK LIMITED (originally registered by ICI). 76.110.165.21 ( talk) 02:52, 8 November 2008 (UTC)
"PMMA does not shiver". What does this mean? Graham 00:09, 26 Jul 2004 (UTC)
Is there any online information or even printed material on how this material is used, kind of a practical guide to designing and making things with perspex?
The SMILES string seems to display only the monomer, correct? Should it nevertheless remain in the table? Why is one of the C's in square brackets? AxelBoldt 23:51, 13 March 2006 (UTC)
Could anyone describe the toxicity of polymethyl methacrylate in common modern environmental situations, for example: 1) consumption of water that has had contact with Plexiglas 2) consumption of water that has had contact with heated Plexiglas 3) at which temperatures does Plexiglas begin to off-gas toxic chemicals
In particular, i am trying to determine the usefulness of this material in making #REDIRECT solar cookers, which involves potential contact with food and high temperatures (200C). [End of unsigned comment.]
The temperature that you are trying to use the Plexiglas at is too high and it will deform the material, however the residual monomer in the material will not be harmful. Consider that there are FDA approvals for Plexiglas, you can contact tech specialists at Arkema Inc/ Plexiglas Webpage. ( EMILIOJPEDRAL ( talk) 00:27, 9 July 2008 (UTC)) Emilio Pedral.
The article asserted that plexiglas was first brought to market in 1928 by "the German company Röhm". I think this is incorrect, and that the company that was meant here was actually Rohm and Haas. If so, the name was certainly incorrect, because (a) it omitted Haas, who was a company founder and whose name has always been in the name of the company, and (b) Rohm is not spelled with a dieresis. But my correction could be mistaken, if what was really meant was a German company named Röhm. -- Dominus 18:46, 30 March 2006 (UTC)
Note also that:
So if one wants to attribute the material to its inventor, one could say that it was invented by Röhm. But if one wants to attribute the material to the company, one could say that it was brought to market by Rohm and Haas.
See for example the official company history of Rohm and Haas. -- Dominus 18:53, 30 March 2006 (UTC)
Also note that Rohm and Hass in America is no longer manufacturer of Plexiglas and that these PMMA resins and sheets are currently produced by Arkema Inc. through it's Altuglas International Division. Plexiglas Webpage. ( EMILIOJPEDRAL ( talk) 00:22, 9 July 2008 (UTC))
I see two things that bother me about this entry. The first is in the properties table, where a melting point is listed, although PMMA is known to be amorphous - that is why it is also transparent. Only highly isotactic & syndiotactic PMMA will crystallize and therefore melt.
The second is the statement, that PMMA can be easily formed, by heating to 100C. Heating what to 100c? I assume the monomer, methyl methacrylate (MMA).
Matijac 20:06, 4 April 2006 (UTC)
Is plexiglass really shatter proof because from what I can tell it does shatter. I can show you links to news reports of people being sent to the hospital in a hockey game recently.
155.33.109.148 00:28, 12 December 2006 (UTC)
There should be some sources cited for the large amount of material in this article... Valrith 21:52, 5 October 2006 (UTC)
You can get much more information by downloading the PDF file related to the Physical Properties of Plexiglas Plexiglas PDF's ( EMILIOJPEDRAL ( talk) 00:32, 9 July 2008 (UTC)) Emilio Pedral.
I have never ever heard anyone refer to PMMA as acrylic glass. Some people will refer to it as Acrylic while most simply refer to it by the particular brand name of the polymer in use, or when talking about the resin in general its usually just called PMMA. Does anyone know of an industry that uses the term acrylic glass? I am a plastics engineer and I've not heard it refered to by this name before, but it may be a case of regional differences. I'd like to get some feedback before considering making a change to the title of the article. CoolMike 15:57, 21 November 2006 (UTC)
Plexiglass shatters. It happens all the time in hockey rings in fact it happened just recently. 155.33.109.148 00:26, 12 December 2006 (UTC)
I added the Tg and Young's modulus. These came from Introduction to Physical Polymer Science. L. H. Sperling, 3rd ed., Wiley-Interscience, New York 2001. I don't know how to cite these in the infobox. If you feel that this citation is important, please feel free to cite it. User:carsonc 16:04, 14 December 2006 (UTC)
I'm a moderator on a watch collector's forum, and discussion about acrylic watch crystals comes up all the time. I've added a new paragraph to the "uses" section.
Also, as my wife is studying to be an optometrist, she pointed out that hard contact lenses are no longer made with acrylic, so she edited that section as well. —The preceding unsigned comment was added by 69.203.82.86 ( talk) 02:04, 12 May 2007 (UTC).
I can not find information about UV-proofness of PMMA. Does anybody have data about capability to stand UV radiation and how is it to compare with PC and PS? Tiit tiitk@msn.com —Preceding unsigned comment added by 62.65.35.22 ( talk) 08:16, July 17, 2007
I came here today to study the differences between cast vs. extruded acrylic. I created a project out of scrap pieces from the shop where I work (I'm in a different department so I'm not 100% familiar) only to discover that I've used two different types of acrylic and they have very different characteristics. Yet the only reference I can find in this article is that the extruded form is used in pressurized aircraft. Nothing else seems to be mentioned on the subject. Compare this with the vast array of information about how different types of glass is manufactured. —Preceding unsigned comment added by 75.162.104.28 ( talk) 18:40, August 1, 2007
If someone would be so kind as to add this new interesting product to the Other Uses. A proposed terabyte capacity optical media disc. Currently stores between 600 to 800 gigabytes. [1] Axion22 16:17, 23 August 2007 (UTC)
At the end of the Properties section:
"To produce 1 kg of PMMA, about 2 kg of petroleum is needed. In the presence of oxygen, PMMA ignites at 460° C and burns completely to form only carbon dioxide and water."
Does "in the presence of oxygen" mean in air? Or does it have to be a pure oxygen atmosphere, otherwise there are other products? This point is unclear from the sentence as it stands.
WikiReaderer 14:28, 30 September 2007 (UTC)
Well first of all, temperature is given, 460 °C, and how about we go with atmospheric pressure...it just makes sense, and enough oxygen to complete the combustion reaction? The might be just any oxygen at all, but why is this even a big deal? 24.164.75.68 ( talk) 21:04, 10 June 2008 (UTC)
I agree that it is not an important point to make. While we're at it, why not include relative humility, wet-bulb temperature, etc etc. It is clear enough as it stands because it simply implies that combustion needs to take place in the presence of oxygen. AnimeEd ( talk) 04:38, 17 June 2008 (UTC)
I disagree on the "only" carbon dioxide and water: it depends on the factor we have seen here and more. —Preceding unsigned comment added by Bonarda ( talk • contribs) 21:01, 12 November 2008 (UTC)
Poly(methyl methacrylate) (with the parenthesis) is bolded in the article, but gives a red link. As does Limacryl, R-Cast, Plazcryl, Acrylex, Altuglas, and Polycast. Acrylic is bolded, but actually directs to a disambiguation page. -- 128.104.112.85 ( talk) 20:36, 8 April 2008 (UTC)
This does not really have to do with the article but I want to ask a question of the experts. I did some research on the Internet but with only limited answers. I have just installed two 2' x 4' pieces of plexiglas on top of a container that I want to get hot. It will be a solar water heater. It must have got hot because I noticed that the plexiglas has shrunk a bit. There is now about a 1/8th inch gap between the two pieces. According to various sites it begins to shrink at about 180 degrees F. My question is will it continue to shrink or after a period of time can I expect that it has finished shrinking and I can bring the two pieces together again and fasten them down and join them together? Conversely, will it expand or break when it gets cold out (it can get to about 10 degrees F here in the winter)? Thank You. 4.246.200.226 ( talk) 02:28, 4 August 2008 (UTC)
I added 'Plexiglas' as a common name for acrylic glass because this is how we named this product the most commonly here in Europe. I didn't know until I read the article it was a trademark name ! Lvr ( talk) 11:21, 5 December 2008 (UTC)
I like the article and enjoy all the effort everyone's put into it. However, it seems to be a combination of two articles that need to be split. There is some good generic information on acrylic glasses in the article, but by far the majority of the article focuses on one specific example: poly(methyl methacrylate). Acrylic glass is such a generic term for PMMA, it is similar to putting the Wikipedia entry for Tiger under the title Feline. PMMA needs its own article, and the terms PMMA and poly(methyl methacrylate) should not redirect here. I propose moving this article ASAP, so I'm posting this here for some discussion time before any move. Thoughts? Hokiesvt ( talk) 19:16, 26 March 2009 (UTC)
Simple question, can it be done? multiple somewhat confusing statements above in the "...100c" discussion. I'm starting a project to make visors and face shields for a set of movie props and found a product that is "semi-transparent film of aluminum deposited on an acrylic substrate" Thus the question: Can it be vacuum formed? Nullexe ( talk) 21:58, 18 November 2009 (UTC)
"Can PMMA be heated to a point where it will become malleable and useful for vacuum-forming applications, without losing cohesion completely or separating into other compounds?" Nullexe ( talk) 22:54, 18 November 2009 (UTC)
![]() | This page is an archive of past discussions. Do not edit the contents of this page. If you wish to start a new discussion or revive an old one, please do so on the current talk page. |