Utile Glass Erlenmeyer Flask Set, 250ml Narrow Mouth Erlenmeyer Flasks, 6pcs of Borosilicate 3.3 Glass Conical Flasks for Laboratory with Printed Graduation, 4016.0250.6

Tips: Please understand that the glassware are fragile, so please do not hesitate to contact us for refund if you receive products cracked during transit, your feedback and suggestion are valuable for us. These glass flasks are made of 3.3 Borosilicate material, they are designed with heavy duty rims to reduce chipping. Their uniform wall thickness provides the proper balance between mechanical strength and thermal shock resistance. Not suggest for accurate measuring. Make sure the water on the outer wall of the flask wiped clean before heating the beaker. Recommend not exceed 2/3 of the volume of the flask when the liquid is heated. The glass rod must not touch bottom or wall of the flask when dissolving substance, otherwise, the flask may be cracked during stirring. Thanks for your trust and purchasing Utile Products.