Overview

Round-bottom flasks (also called round-bottomed flasks, Flasks, round bottom, or RB Flasks)having spherical bottoms are more resistant to fracturing under vacuum, as a sphere more evenly distributes stress across its surface. Because of the spherical bottom, cork rings are needed to keep the round bottom flasks upright,or heated by the water bath ,oil bath or sand bath.When in use, round-bottom flasks are commonly held at the neck by flask clamps on a stand.

The flasks are usually used in heating or boiling a liquid, in distillation as distilling flasks and receiving flasks for the distillate, used as the distilling flasks in rotary evaporators.It is usually used with other jointed lab glassware like glass condenser,separatory funnels,cow receivers.

The round bottom flask has larger heating surface than the flat bottom flask and can be heated evenly.It is usually used in the laboratory operation requiring high temperature and long time heating,or vacuum distillation.

glass flasks are heavy wall designed,made by hand-blowing to ensure uniform wall thickness, made of high-quality borosilicate glass and annealed at 800 degree Celsius ,can be heated directly in an open flame and can withstand typical laboratory thermal variations in Chemistry processes like heating and cooling.

This round bottom flask designed with 24/40 standard taper outer joint,interchangeable,leak-free,comparing to common boiling flask without ground joint, it is convenient,safe,easy-operation in laboratory glassware setup. Capacity of 25mL.

This round bottom flask designed with 24/40 standard taper outer joint,interchangeable,leak-free,comparing to common boiling flask without ground joint, it is convenient,safe,easy-operation in laboratory glassware setup. Capacity of 50mL.

This round bottom flask designed with 24/40 standard taper outer joint,interchangeable,leak-free,comparing to common boiling flask without ground joint, it is convenient,safe,easy-operation in laboratory glassware setup. Capacity of 100mL.

This round bottom flask designed with 24/40 standard taper outer joint,interchangeable,leak-free,comparing to common boiling flask without ground joint, it is convenient,safe,easy-operation in laboratory glassware setup. Capacity of 250mL.

This round bottom flask designed with 24/40 standard taper outer joint,interchangeable,leak-free,comparing to common boiling flask without ground joint, it is convenient,safe,easy-operation in laboratory glassware setup. Capacity of 500mL.

This round bottom flask designed with 24/40 standard taper outer joint,interchangeable,leak-free,comparing to common boiling flask without ground joint, it is convenient,safe,easy-operation in laboratory glassware setup. Capacity of 1000mL.

This round bottom flask designed with 24/40 standard taper outer joint,interchangeable,leak-free,comparing to common boiling flask without ground joint, it is convenient,safe,easy-operation in laboratory glassware setup. Capacity of 2000mL.

Standard Taper Ground Glass Joints are interchangable.For either frosted, presicon-ground standard taper joints (same size),the inner ground surfaces (male joint) make a good seal with the outer(female joint)). The joint size is described by the form A/B. The first number A represents the outer diameter (OD) in millimeters (mm) at the widest point of the inner (male) joint and the second number B represents the length of the joint. For example, a 14/20 joint is 14 mm wide at the top (the widest part) and is 20 mm in longth. The joint has a standard taper 1:10, any two joints (male and female) with the same outside diameter (A)can fit into each other ,no matther how lenght the joints are. For example, a 24/40 (US standard size) joint on a condenser will fit into a 24/29 (European standard size)flask but the ground glass joint will protrude (40 - 29) 11mm into the flask.

glass ware are all made of high quality boroslicate glass according to ASTM E438,heavy wall design,durable and reusable.

1. Check the integrity of the product before packaging.
2. Bubble wrap tightly around the product.
3. Fill the space in the packing box with pearl cotton.

Silicon content>80%Strain and Temperature520℃ Annealing temperature800℃ Index of refraction1.47Transmittance≧90％ Elastic modulus E67KNmm-2Tensile strength40-120Nmm-2Processing temperature(104dpas1220℃ Coefficient thermal expansion(20-300℃) (3.3±0.1)×10-6/K -1Poisson's ratio μ0.2Density（20℃）2.23g/cm3Specific heat0.9Jg-1K-1Thermal conductivity(20-100℃）1.2Wm-1K-1Water resistance1 LevelAcid resistance1 LevelAlkali resistance2 Level

Glass 25mL Single Neck Round Bottom Boiling Flask Heavy Wall 24/40 Joint Heating Distillation Reaction Receiving Flask Organic Chemistry Lab Glassware

Glass 50mL Single Neck Round Bottom Boiling Flask Heavy Wall 24/40 Joint Heating Distillation Reaction Receiving Flask Organic Chemistry Lab Glassware

Glass 100mL Single Neck Round Bottom Boiling Flask Heavy Wall 24/40 Joint Heating Distillation Reaction Receiving Flask Organic Chemistry Lab Glassware

Glass 250mL Single Neck Round Bottom Boiling Flask Heavy Wall 24/40 Joint Heating Distillation Reaction Receiving Flask Organic Chemistry Lab Glassware

Glass 500mL Single Neck Round Bottom Boiling Flask Heavy Wall 24/40 Joint Heating Distillation Reaction Receiving Flask Organic Chemistry Lab Glassware

Glass 1000mL Single Neck Round Bottom Boiling Flask Heavy Wall 24/40 Joint Heating Distillation Reaction Receiving Flask Organic Chemistry Lab Glassware

Glass 2000mL Single Neck Round Bottom Boiling Flask Heavy Wall 24/40 Joint Heating Distillation Reaction Receiving Flask Organic Chemistry Lab Glassware

US Standard Size Joint Will Fit into European Standard Size Joint

Heavy Wall Design,Durable and Reusable

Protection of Products in Transit

Material: Borosilicate Glass(PYREX Glass)