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The most common use of a triangular file in a chemistry laboratory is to score (scratch) and weaken small diameter glass tubing prior to breaking it. This makes the glass a) easier to break and b) more likely to break cleanly where the score is instead of randomly, leaving jagged edges. Pressure is applied on the OPPOSITE side of the score; remember to protect your hands with heavy gloves and/or a thick cloth.

Large diameter tubing requires different methods; the "score and snap" technique tends not to work so well.

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Scoring glass tubing at the place it is desired to break at.

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Q: What is the use of a triangular file?
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