Borosil Pricelist 2021-22

an ISO 9001: 2015 certified company | BOROSIL ® 283 A GUIDE ON GLASS BREAKAGE AND RECOMMENDED SOLUTIONS Type of breakage Causes of glass breakage Solution Breakage during cooling procedures Placing the hot vessel on cold surface/ filling up a hot vessel with cold liquids Allow the vessel to cool before placing or filling it up on/ with cold surfaces/substances Breakage due to scratches and abrasions inside the vessel Use of incorrect anti-bumping device, such as broken procelain with sharp edges that causes internal abrasions and reduces mechanical strength of the glass Always use anti-bumping devices in the vessel, such as powdered pumice or glass wool Use of improper stirring device that causes internal abrasions and reduces mechanical strength of the glass Always use a teflon sleeve or a similar device on stirring rods, to prevent scratching of the inside of the vessel When using a glass vessel with a magnetic stirrer, always use a covered follower. This prevents abrasion of the walls from inside of the vessel Breakage of the base of the glass container Placing the hot vessel on cold surface/ filling up a hot vessel with cold liquids Allow the vessel to cool before placing or filling it up on/ with cold surfaces/substances Use of a glass or metal mechanical stirrer in a glass vessel Always pre-determine the height of the stirrer before use, to ensure that the stirrer blade does not come in contact with the base or sides of the vessel Addition of the antibumping device froma height in the glass vessel Addition of water to acid in a glass vessel which generates sudden heat and leads to breakage Always ensure to add water first in the glass container followed by slow addition of acid Breakage due to vacuum/ pressure Application of sudden pressure changes Apply and release positive or negative pressures gradually. Use of pressure beyond the limit Refer manufacturers instructions carefully before applying pressure/ vaccum to the glass vessel Breakage of stopcocks and joints Stopcocks stuck hardly on burettes and funnels When not in use insert a thin strip of paper between the joint surfaces to prevent them from sticking Mechanical separation of the joint by carefully rocking the Cone in the socket, or gentle tapping the socket flange on a wooden surface, or by heating the socket and not the Cone in a localised flame Use of penetrating oil Frequent lubrication to prevent the stopcock and joints from sticking When using lubricants, it is advisable to apply a light coat of grease all around the upper part of the joint. Use only a small amount, and avoid greasing the part of the joint that comes in contact with the inside of the apparatus. Three types of lubricants are commonly used on standard taper joints. (a) Hydrocarbon grease is the most widely used. It can be removed easily by most laboratory solvents, including acetone. (b) As hydrocarbon grease is easy to remove, silicon grease is usually preferred for higher temperature or high vacuum applications. It can be removed with chloroform easily. (c) For long-term reflux or extraction reactions, a watersoluble, organic and insoluble grease such as glycerin, is suitable. Glycerin can be removed by means of water Breakage during inserting glass tubing into rubber bung Improper lubrication Use water, oil or glycerol on both, the tubing as well as the rubber bung Presence of rough ends Always fire-polish the rough ends of the glass tubing before attempting to insert it into flexible tubing