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Business This article is within the scope ofWikiProject Business, a collaborative effort to improve the coverage ofbusiness articles on Wikipedia. If you would like to participate, please visit the project page, where you can jointhe discussion and see a list of open tasks.BusinessWikipedia:WikiProject BusinessTemplate:WikiProject BusinessWikiProject Business ??? This article has not yet received a rating on theproject's importance scale. GlassMid‑importance This article is within the scope ofWikiProject Glass, a collaborative effort to improve the coverage ofglass on Wikipedia. If you would like to participate, please visit the project page, where you can jointhe discussion and see a list of open tasks.GlassWikipedia:WikiProject Physics/Taskforces/GlassTemplate:WikiProject Glassglass Mid This article has been rated asMid-importance on theimportance scale. Brands This article is within the scope ofWikiProject Brands, a collaborative effort to improve the coverage ofbrands on Wikipedia. If you would like to participate, please visit the project page, where you can jointhe discussion and see a list of open tasks.BrandsWikipedia:WikiProject BrandsTemplate:WikiProject BrandsBrands ??? This article has not yet received a rating on theproject's importance scale.

What type of glass forms the surface and the core ? Do they have a differentcoefficient of thermal expansion ? and how hard is the surface ? -Rod57 (talk)19:02, 30 October 2014 (UTC)[reply]

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