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Borosilicate(boro)glass is a very unique and specialized type of glass. Its composition is much different from the "soft" glass that is normally used for beads, paperweights, art glass bowls, ornaments, etc. Boro glass is far stronger than "soft" glass and has been used for everything from stovetop cookware to nuclear waste containment. One of its most frequent uses is to make scientific glassware such as beakers and test tubes. Corning Pyrex measuring cups are a familiar example of borosilicate glass, very hard and durable, try to scratch one! You will probably need carbide steel or a diamond. Borosilicate glass, like diamonds, will scratch other borosilicate glass. Remember it is best to keep finished jewelry and other work from rubbing against each other.
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Borosilicate Glass Pendants
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