Specification Brand : LABOY BulletPoint1 : Heavy-Wall Borosilicate Glass Construction Crafted from premium 3.3 borosilicate glass with thick walls (3.5–5mm) for superior thermal and mechanical strength. Withstands direct flame heating, vacuum conditions, and extreme temperature changes without cracking. BulletPoint2 : Standard 35/20 Ball Joint – Easy Assembly with Pinch Clamp Precision-formed 35/20 ball joint allows quick and secure connections between lab components. Its spherical interface enables fast setup and disassembly, especially in vertical or angled assemblies. Designed to be held in place using a pinch clamp for a tight, reliable seal in distillation, vacuum, or reflux systems. BulletPoint3 : 250mL Capacity – Optimal for Medium-Scale Laboratory Reactions Commonly used in reflux setups, heating mantles, or receiving distillates. The 250 mL volume supports routine lab synthesis and chemical production tasks. BulletPoint4 : Round Bottom for Uniform Heat Distribution Round bottom design promotes even heating, reduces hotspots, and minimizes stress fractures. Requires support via cork ring or clamp – recommended for controlled heating with mantles or water baths. BulletPoint5 : Hand-Blown Quality – Stress Relieved & Impurity-Free Each flask is handcrafted and annealed at high temperatures for optimal clarity and structural integrity. No bubbles or contaminants—ensuring reproducibility in critical lab procedures. Capacity : 250 milliliters ItemName : Laboy Glass 250mL Round Bottom Boiling Flask, Single Neck Heavy Wall Borosilicate with 35/20 Joint – Heating, Reaction & Receiving Flask for Organic Chemistry Lab Use ItemTypeKeyword : science-lab-boiling-flasks Manufacturer : Laboy Material : Glass NumberOfItems : 1 PartNumber : HMF010503 ProductSiteLaunchDate : 2020-03-17T00:35:43.267Z Size : Capacity of 250mL SpecificationMet : ASTM E438 SupplierDeclaredDgHzRegulation : not_applicable UnspscCode : 41121800