Products List
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
10L Round Bottom Boiling Flask - 3 neck 1 - 24/40 and 2 - 34/45
USA LabRBF10L3NECK$299.00Our 10L 3 Neck Round Bottom Boiling flask is constructed with 3.3 Borosilicate Glass and has 1-a 24/40 and 2 - 34/45 necks. Capacity: 10000mL / 10L Neck Size: 24/40 & 34/45 Necks: 3 SKU: RBF10L3neck We... -
5L Round Bottom Receiving Flask - 3 neck 2 - 24/40 and 34/45 Center
USA LabRBF5L3NECK-2434$170.00Our 5L 3 Neck Round Bottom Flask is constructed with 3.3 Borosilicate Glass with 2 - 24/40 and 1 - 34/45 neck for a durable, common size receiving flask to use. Capacity: 5000mL / 5L Neck Size: 24/40 &... -
USA Lab Round Bottom Flask - 1 neck 24/40 - Various Sizes
USA Lab$20.00 - $130.00.usalab-prod{--accent:#13a8b6;--ink:#0f1b2d;--muted:#64748b;--card:#f7f9fc;--ring:#e6ecf2;font-family:inherit} .usalab-prod *{box-sizing:border-box} .usalab-prod h2,.usalab-prod h3{margin:0 0 .5rem;color:var(--ink);line-height:1.2} .usalab-prod... -
USA Lab 2-Neck Round Bottom Flask – Borosilicate 3.3 Glass
USA Lab$20.00 - $249.00.usalab-prod{--accent:#13a8b6;--ink:#0f1b2d;--muted:#64748b;--card:#f7f9fc;--ring:#e6ecf2;font-family:inherit} .usalab-prod *{box-sizing:border-box} .usalab-prod h2,.usalab-prod h3{margin:0 0 .5rem;color:var(--ink);line-height:1.2} .usalab-prod...
Round-Bottom Flasks From USA Lab
Durable, Heat-Resistant Glassware for Distillation and Reaction Systems
Round-bottom flasks are the workhorses of any chemistry lab. Designed for uniform heating and smooth mixing, they're essential for distillation, reflux, and reaction setups. USA Lab offers a complete range of single-, double-, and triple-neck borosilicate flasks that deliver excellent heat resistance, strength, and precision.
Designed for Uniform Heating and Versatile Use
Borosilicate 3.3 Glass
Engineered to withstand thermal stress and chemical exposure to perform reliably during heating, cooling, and daily solvent use.
Multiple Neck Configurations
Choose from 1-, 2-, or 3-neck designs to suit your apparatus, making it easy to connect condensers, thermowells, addition funnels, or probes.
Ground-Glass Joints
24/40 and 34/45 standard taper joints ensure leak-free compatibility with common lab condensers, adapters, stoppers, and vacuum systems.
Heavy-Wall Options
Added strength for vacuum or high-temperature operations, providing extra confidence when working under reduced pressure or when uniform heating is essential for reaction control.
Compare Round-Bottom Flask Options
| Capacity | Models | Joint Sizes |
|---|---|---|
| 250mL | 1-Neck Flask 2-Neck Heavy-Wall Flask |
24/40 |
| 500mL | 1-Neck Flask 2-Neck Flask 1-Neck Spherical Joint Flask |
24/40 35/20 |
| 1L | 1-Neck Flask 2-Neck Flask |
24/40 |
| 2L | 1-Neck Flask 2-Neck Flask |
24/40 |
| 5L | 1-Neck Flask 2-Neck Flask 3-Neck Flask |
24/40 and 34/45 2 – 24/40 and 1 – 34/45 |
| 10L | 3-Neck Flask | 1 – 24/40 and 2 – 34/45 |
Practical Design for Reliable Operation
- Smooth curved base — Promotes even heat transfer and prevents localized boiling.
- Precision joints — Provide airtight seals for vacuum or distillation connections.
- Thick glass walls — Offer stability and durability under repeated thermal cycling.
- Easy compatibility — Pairs with USA Lab mantles, condensers, and adapters.
Choosing the Right Flask for Your Work
- Performing basic distillation or heating tasks? → A single-neck flask keeps things simple.
- Need access ports for thermometers or gas inlets? → Go with a double- or triple-neck design.
- Working at larger volumes? → Choose a 5L or 10L flask for high-capacity processing.
- Running under vacuum? → Use heavy-wall options for added safety and strength.
Why Choose USA Lab Round-Bottom Flasks
- Multiple neck and joint options for flexible configurations.
- Compatible with all standard USA Lab distillation and heating equipment.
- Supported by fast U.S. shipping and responsive technical help.
Equipment That Complements Your Round-Bottom Flasks
Pair your flasks with:
- Heating mantles to provide even, controlled heat
- Condensers to build complete reflux or distillation systems
- Stands and clamps to hold multi-neck flasks in place
- Vacuum pumps and cold traps to manage vapor flow and protect equipment
