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| Q. |
Which of the following is responsible for the extra strength of pyrex glass? |
| A. | Potassium Carbonate |
| B. | Lead Oxide |
| C. | Borax |
| D. | Ferric Oxide |
| Answer» C. Borax | |
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Explanation: Older clear-glass Pyrex manufactured by Corning before 1998, Arc International's Pyrex products, and Pyrex laboratory glassware is made of borosilicate glass. According to the National Institute of Standards and Technology, borosilicate Pyrex is composed of (as percentage of weight): 14% boron, 51% oxygen, 0.3% sodium, 1% aluminium, 38% silicon, and less than 1% potassium. Pyrex glass cookware manufactured by World Kitchen is made of tempered soda- lime glass instead of borosilicate. |
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