Glass 2 neck Round Bottom Boiling Flask Angled with Standard Taper Joints

Product Overview Laboy Glass Two-Neck Round Bottom Flasks are expertly crafted laboratory vessels designed for high-performance applications in organic synthesis, reflux setups, distillations, and vacuum operations. Manufactured from premium borosilicate 3.3 glass (Type I Class A), these flasks offer exceptional thermal stability, chemical resistance, and mechanical strength. Hand-blown and annealed to ensure uniform wall thickness (approximately 3.5–5 mm), they are built to withstand the demands of rigorous laboratory use. Available in a wide range of volumes—from 10mL for micro-scale reactions to 2000mL for large-batch processes—Laboy’s two-neck flasks provide the flexibility needed for various experimental setups. All models feature precision-ground standard taper joints in commonly used sizes: 14/20, 19/22, 24/40, 29/42, 34/45, 45/50, and 55/50, ensuring seamless compatibility with most laboratory glassware. Key Features Borosilicate 3.3 Glass Construction:Made from high-purity borosilicate 3.3 glass for superior thermal and chemical resistance. Withstands temperatures from -60°C to 500°C and resists thermal shock during heating and cooling cycles. Heavy Wall Design:Thick, hand-blown walls (~3.5–5 mm) enhance durability and even heat distribution. Ideal for high-temperature applications and vacuum operations without risk of implosion or cracking. Dual Neck Configuration:Each flask features a centered vertical neck and an angled side neck, facilitating simultaneous attachment of condensers, thermometers, dropping funnels, or vacuum adapters. This dual-access design is perfect for complex synthetic procedures. Wide Range of Capacities:Offered in capacities including 10mL, 25mL, 50mL, 100mL, 250mL, 500mL, 1000mL, 2000mL, and more. This variety allows researchers to scale reactions appropriately based on volume needs. Multiple Joint Sizes:Available joint configurations include 14/20, 19/22, 24/40, 29/42, 34/45, 45/50, and 55/50. Each joint is precisely ground and polished for a secure, airtight seal, critical for reflux, distillation, and vacuum work. High Compatibility:Standard taper joints ensure interchangeability with laboratory condensers, stoppers, adapters, and other glassware components commonly used in organic chemistry laboratories. Hand-Blown Excellence:Each flask is individually hand-blown and annealed for stress relief, resulting in superior optical clarity, strength, and consistency compared to mass-produced glassware. Chemical Inertness:Highly resistant to acids, bases, and organic solvents, preserving the purity of reaction contents and ensuring safe, contamination-free experiments. Versatile Applications:Suitable for academic research, industrial labs, pharmaceutical development, pilot plant operations, and DIY chemistry projects. Typical Applications Reflux reactions Fractional and simple distillation Organic synthesis (Grignard reactions, reductions, polymerizations) Vacuum distillation and rotary evaporation Teaching labs and micro-scale chemistry Available Options Capacity (mL) Center Neck Joint Size Side Neck Joint Size 10 mL 14/20 14/20 25 mL 14/20, 19/22 14/20, 19/22 50 mL 14/20, 19/22, 24/40 14/20, 19/22, 24/40 100 mL 14/20, 19/22, 24/40 14/20, 19/22, 24/40 250 mL 24/40, 29/42 24/40, 29/42 500 mL 24/40, 29/42 24/40, 29/42 1000 mL 24/40, 29/42, 34/45 24/40, 29/42, 34/45 2000 mL 34/45, 45/50, 55/50 34/45, 45/50, 55/50 Other combinations available upon request (e.g., mixed joint sizes for center and side necks).   Q&A for Laboy Glass Two-Neck Round Bottom Boiling Flasks Q1: What materials are Laboy two-neck flasks made from? Are they safe for heating and vacuum use?A1:Laboy two-neck flasks are made from high-purity borosilicate 3.3 glass (Type I Class A), known for its outstanding thermal shock resistance and chemical inertness. They can withstand temperatures from -60°C to 500°C and are suitable for direct heating (e.g., in a heating mantle) and for use under vacuum. Their heavy-wall hand-blown construction ensures durability and safety even during demanding laboratory processes. Q2: What joint sizes are available for the two-neck flasks, and are they interchangeable with other lab equipment?A2:These flasks are available with standard taper joints in sizes 14/20, 19/22, 24/40, 29/42, 34/45, 45/50, and 55/50. All joints are precision-ground and polished for airtight, leak-free connections. They are fully compatible with standard lab glassware like condensers, adapters, stoppers, addition funnels, thermometer holders, and vacuum adapters. Q3: How should I set up and support a two-neck round bottom flask during experiments?A3:Use a cork ring to stabilize the flask upright on the bench when assembling your setup. Secure the flask with a lab clamp attached to a support stand, usually by clamping one of the necks. Make sure all attached apparatus (condensers, thermometers, etc.) are securely fitted into the joints. Use a heating mantle or oil bath for even, safe heating. Never apply uneven or unsupported heating to avoid stress on the flask. Q4: What is the benefit of having a side neck angled outward instead of vertical?A4:The angled side neck provides easier access for inserting thermometers, addition funnels, or other apparatus. It reduces the risk of interfering with vertical attachments (like condensers) and facilitates safer reagent addition and probe insertion during ongoing reactions. Q5: Can Laboy two-neck flasks be used for vacuum distillation?A5:Yes. The thick walls and precision ground joints are designed to handle vacuum conditions. For optimal performance, ensure that all joints are clean and optionally apply a small amount of vacuum grease to the joint surfaces to improve the seal. Always inspect glassware for any chips or cracks before applying vacuum pressure. Q6: What flask capacities are available and how do I choose the right size?A6:Available capacities range from 10mL to 2000mL. 10mL–100mL: Ideal for micro-scale reactions, pilot experiments, reagent conservation. 250mL–500mL: Standard sizes for medium-scale organic synthesis or distillation. 1000mL–2000mL: Suitable for large-scale reactions, fractional distillation, or vacuum work requiring larger vapor volumes.Select the flask size based on your total reaction volume, keeping in mind that typically a flask should be filled no more than half to two-thirds full to allow safe reflux or boiling. Q7: Does the flask come with stoppers, condensers, or clamps included?A7:No. The flask is sold individually. Stoppers, condensers, clamps, and support stands must be purchased separately. All accessory glassware intended for use should match the flask’s joint size for proper fitting. Q8: What distinguishes Laboy’s hand-blown flasks from machine-made flasks?A8:Laboy’s hand-blown flasks are made by experienced artisans who ensure uniform wall thickness, superior clarity, and precision in joint formation. They are stress-relieved through high-temperature annealing, reducing internal flaws. Compared to mass-produced flasks, hand-blown glassware offers greater mechanical strength, better resistance to cracking, and higher reliability under thermal and vacuum stresses. Q9: How do I clean and maintain my two-neck flask for long-term use?A9:Rinse the flask immediately after use with suitable solvents (e.g., acetone for organic residues, dilute acid wash for salts). Avoid sudden temperature changes during cleaning. Use soft brushes for stubborn residues but avoid scratching the surface. Always dry thoroughly before storage. Inspect joints and body regularly for signs of wear, chips, or cracks. Q10: Can Laboy two-neck flasks be customized for special configurations (e.g., different joint sizes on center and side necks)?A10:Yes. Laboy Glass offers custom glassblowing services for laboratories requiring special designs, such as different joint sizes, additional necks, or specialized angles. Contact customer service with your specifications for a custom quote.