Chemglass Round-Bottom Boiling Flasks Heavy Wall Chemglass. Due to their unique construction one wall of these flasks does not soften under the influence of boiling or distilling mixtures. The one wall design also maintains their fire-retardant properties. Chemglass offers a range of sizes for use in the laboratory that are designed to retain their heat. These flasks are constructed from ground and polished double-layer amber glass with a heavy-wall stem to provide excellent heat retention. A one-piece stopper with an ST outer joint is included with each flask. For a wide selection of Chemglass pieces please visit our Chemglass store section. Specifications for Chemglass Round-Bottom Boiling Flasks Heavy Wall Chemglass CG-1506-46 : Capacity mL: 300 ST Joint Size: 24/40 Chemglass No.: CG-1506-46 Unit: Each (300 ML) (Please note that the description and stock photo may not correspond to the specific model listed above) We offer only genuine Chemglass products authorized for sale in the U.S. and other markets so you can be sure that you are buying authentic Beakers Test Tubes Flasks & Accessories with a full manufacturer's warranty in addition to our own 100percent Satisfaction Guarantee. We are your premier online distributor for Chemglass Beakers Test Tubes Flasks & Accessories. We are an authorized supplier to all federal and state government agencies as well as to research and educational institutions and can facilitate volume orders on many types of laboratory equipment lab consumables and other products to help fulfill your specific needs. We offer Free Shipping and FREE USPS shipping to APO and FPO addresses on all orders in our store over 49. Please refer to our APO/FPO Shipping and Export Restrictions for more information on export to APO/FPO addresses. In addition to the Chemglass Round-Bottom Boiling Flasks Heavy Wall Chemglass CG-1506-46/ 80068-828 we carry a full complement of Beakers Test Tubes Flasks & Accessories as well as other product offerings from Chemglass. We also carry a full line of Chemglass accessories to help meet your laboratory and scientific needs. For a complete selection of Chemglass Beakers Test Tubes Flasks & Accessories please visit our Chemglass page. For more brand name Beakers Test Tubes Flasks & Accessories please visit our Beakers Test Tubes Flasks & Accessories store section. To see our complete line of lab medical industrial and scientific products please see our science and lab equipment online catalog. Chemglass Round-Bottom Boiling Flasks Heavy Wall Chemglass CG-1506-46