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Digestion tubes are made of thick-walled borosilicate glass with heavy-duty retention lips and contoured bottoms for optimal heat transfer and minimal thermal shock. Precise height and controlled wall thickness ensure exhaust system compatibility and accurate, consistent fit across all models. Digestion tubes are available in straight and volumetric models. Volumetric tubes feature volumetric marking for accurate dilutions, as well as built-in constriction for maximum refluxing and digestion speed.