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Centrifuge tubes with thick walls made of AR-glass. The tubes are non-sterile and have either a round or a conical bottom. With or without rim and with or without graduation. Volumes: 13 and 15 ml. AR-glass is an ecomomic alternative to borosilicate and can be used if the tube is not exposed to major changes in temperature e.g. when cooled down rapidly. In these occasions, borosilicate is the choise while it is chemical and temperature restistant.