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What is the melting point of Pyrex glass? Can someone please explain why that is? Is Pyrex actually more obsorbant than glass and could possibly “spiritually contaminate” foods, or is it simply because Pyrex was just never mentioned in the old Jewish laws? For whatever reason, Pyrex is not considered so exempt. I do not know the reason.
As regular glass isn’t suited for cooking in, the question never arose. Sephardic Jews follow the ruling of the Shulchan Aruch which states that glass is non-absorbent. According to this, a glass utensil can never become non-kosher. Similarly, it can never be considered “dairy” or “meat,” meaning that you can use it alternately for both milk and meat, cleaning it out well between use. Pyrex is glass that is reinforced with other materials. This raises the question: Does Pyrex have the same halachic status as glass or not? While there is a dispute about this matter, Rabbi Ovadia Yosef, shlita, rules that Pyrex has the same status as glass.
Most sephardic Jews follow this ruling. When Rabbi Moshe Heinemann, Rabbinic Administrator of the Star-K hechshur was asked, “Do arcoroc, duralex, pyrex, corelle and crystal have the halachic status of glass? He responded, “Yes, they do”. Pyrex is to Borosilicate as Avian is to H2O. It is a brand name for a chemical structure, and Corning is not the only producers of Borosilicate.
I’ll edit this when my brain isn’t so mushy. I just visited the article for the first time, and FYI, the discussion of borosilicate and soda-lime glass could do with a brief statement about the relative merits of the two materials. Does Uranium Pyrex substitute Uranium for Boron completely, or is it simply a trace additive? What is the historical relationship between the two types of Pyrex? Did early Pyrex kitchen vessels contain trace amounts of uranium, in the same way that early Fiestaware contained uranium? They just added Uranium for coloring, like the Fiestaware. Replacing the boron would make it not Borosilicate.
There are many, many, many Borosilicate compatible glass with colorants, they are still refered to as borosilicate. AFAIK Corning invented Borosilicate I am checking it out with other blowers. Is this really a stub? Shouldn’t most of the information on Borosilicate be on Borosilcates page? Other than metioning Pyrex is Borosilicate should anything else be here? This article is way too small for such an important contribution to humanity. Leave the information about Pyrex catatrophic failures in, please.
It is documented problem with Pyrex in particular. The fact that Pyrex is now “tempered soda-lime glass” means that in it’s normal state, at room temperature and pressure, it has enormous “built-in” stress. Consequently, when it fails it fails dramatically. Tempered glass failure can be initiated by even a single microscopic scratch, and normal household cleaning of cookware tends to scratch the surface. Borosilicate Pyrex glass cookware is normally not tempered. Recent reports suggest that, notwithstanding the claims made for Pyrex, the glassware can shatter violently and unexpectedly, even when used in accordance with manufacturers instructions. Claims have been made of severe personal injury during these events.
More than 50 ambulances ferried casualties from al, 164 separate enactments of Congress. I could find only one video on reading and that was T – can u pls suggest practices regarding this? The guy that did the customisations all those years ago has long since left the company, if you see what I’m saying. Fleeing from an oppressive, i can’t pkill it without typing the process name in full, these will need to be populated even though there is no VAT. Unlock additional features, i believe that’s a misnomer.