Distillation experiments use a set of borosilicate glassware: a round-bottom distillation flask, a still head (distillation adapter), a thermometer with adapter, a Liebig condenser, a receiver (vacuum take-off) adapter and a receiving flask, plus anti-bumping granules and a heat source. Distillation is defined as the separation of liquids by selective boiling and condensation, so the glassware must boil a mixture, channel the vapour, cool it back to a liquid and collect it. Fractional distillation adds a fractionating column. All distillation glassware is made from borosilicate 3.3 glass to withstand thermal shock. Edu Lab China manufactures the lab glassware used in these setups.
| What glassware is used for distillation experiments? A simple distillation uses six core glass components: a round-bottom flask to hold and boil the mixture, a still head or distillation adapter to channel the vapour, a thermometer with adapter to read the vapour temperature, a Liebig (straight) condenser to cool the vapour, a receiver adapter, and a receiving flask to collect the distillate — all in borosilicate 3.3 glass with matched ground-glass joints. Anti-bumping granules and a heat source (heating mantle, water bath or burner) complete the setup. Fractional distillation adds a fractionating column. Browse lab glassware and chemistry lab equipment for components. |
What are the core glassware components of a distillation setup?
The core glassware components of a distillation setup are the round-bottom flask, still head, thermometer adapter, Liebig condenser, receiver adapter and receiving flask, supported by anti-bumping granules, a heat source and clamps. Each component performs one job in the boil-channel-cool-collect sequence, and all are made from borosilicate 3.3 glass with interchangeable ground-glass joints so they connect securely. The table lists each component, its function, a typical specification and its priority in a teaching set.
| Glassware component | Function | Typical specification | Priority |
| Round-bottom (distillation) flask | Holds and boils the mixture | Borosilicate 3.3; 250-1000 mL | Essential |
| Still head / distillation adapter | Channels vapour to the condenser; holds thermometer | Borosilicate; matched joints | Essential |
| Thermometer + adapter | Reads vapour temperature at the side arm | -10 to 360 C; ground or PTFE adapter | Essential |
| Liebig condenser | Cools and condenses the vapour | Borosilicate; 200-400 mm jacket | Essential |
| Receiver (vacuum take-off) adapter | Connects condenser to receiving flask | Borosilicate; matched joint | Essential |
| Receiving flask | Collects the distillate | Round-bottom or conical; 100-500 mL | Essential |
| Anti-bumping granules | Promote smooth, even boiling | Inert porous chips | Essential |
| Heat source | Heats the distillation flask | Heating mantle / water bath / burner + gauze | Essential |
| Fractionating column | Improves separation of close-boiling liquids | Vigreux or packed column | Required (fractional) |
| Clamps, stand and joint clips | Support and secure the apparatus | Steel stand; PTFE / Keck clips | Essential |
Caption: The core glassware components of a distillation setup, with the function, a typical specification and the priority of each.
What glassware does each type of distillation need?
Simple distillation needs only the core glass set; fractional distillation adds a fractionating column; steam distillation adds a steam source; and vacuum distillation adds a vacuum take-off adapter and pump. The type of distillation is chosen from the mixture being separated, and that choice determines the extra glassware required. The table maps each distillation type to what it separates and the glassware it adds.
| Distillation type | What it separates | Added glassware | Best for |
| Simple distillation | Liquids with boiling points >~50 C apart; liquid from non-volatile solid | Core set only | Water purification; salt from water |
| Fractional distillation | Liquids with close boiling points | + Fractionating column | Ethanol-water; miscible liquids |
| Steam distillation | Heat-sensitive or immiscible volatiles | + Steam source and inlet | Essential oils; plant extracts |
| Vacuum (reduced-pressure) distillation | High-boiling or heat-sensitive liquids | + Vacuum take-off adapter; pump; manometer | High-boiling-point compounds |
Caption: The glassware required by each type of distillation, with what it separates and what it is best suited for.
Which condenser should you use for distillation?
Use a Liebig (straight) condenser for simple and fractional distillation, and reserve the Graham (coil) and Allihn (bulb) condensers for reflux. The Liebig condenser is the standard distillation condenser because its straight inner tube lets condensate run cleanly down to the receiver, whereas a coil or bulb condenser can trap and flood liquid when mounted at the downward angle distillation requires. An air condenser, which uses no cooling water, is used for liquids boiling above about 150 C.
| Condenser type | Inner geometry | Best use | Note |
| Liebig (straight) | Single straight tube in a water jacket | Simple and fractional distillation | The standard distillation condenser |
| Graham (coil) | Spiral coil | Reflux and condensing volatile vapours | Can flood when used for downward distillation |
| Allihn (bulb) | Series of bulbs | Reflux | Large surface area; suited to reflux, not distillation |
| Air condenser | Plain tube, no water jacket | Liquids boiling above ~150 C | No cooling water required |
| Coil / Dimroth | Internal cooling coil | Efficient reflux and rotary evaporation | High condensing efficiency |
Caption: The condensers used in laboratory work, showing which suit distillation and which suit reflux. For straight distillation, the Liebig condenser is the standard choice.
What specifications should you check before buying distillation glassware?
Before buying distillation glassware, check the glass grade, ground-joint size, wall thickness, flask capacity and condenser length. The single most important specification is the glass: distillation glassware should be borosilicate 3.3, which has a low linear thermal-expansion coefficient of about 3.3 x 10 to the power -6 per kelvin (per ISO 3585), giving it the thermal-shock resistance that heated glassware requires. The table lists the specifications to verify and a typical value or reference for each.
| Specification | What to check | Typical value / reference |
| Glass material | Borosilicate 3.3 grade | ISO 3585 / ASTM E438 Type I |
| Thermal expansion | Low expansion for thermal shock | ~3.3 x 10^-6 per K (borosilicate 3.3) |
| Ground-joint size | Interchangeable taper, matched across the set | 24/29 or 29/32 (ISO 383); 24/40 (US) |
| Wall thickness | Heavy wall for durability and vacuum | Heavy-wall for vacuum distillation |
| Flask capacity | Sized so the mixture fills one-third to two-thirds | 250-1000 mL common |
| Condenser length | Adequate cooling surface | 200-400 mm water jacket |
| Graduations (if any) | Accuracy of graduated receivers | Per ISO 4787 for volumetric ware |
Caption: Specifications to verify before buying distillation glassware, with a typical value or governing reference for each.
How does distillation glassware differ by student level?
Distillation glassware becomes more complete and more standardised with student level: a basic side-arm distillation flask for high school, a quickfit simple-distillation set for college, and a full interchangeable set with fractionating column and vacuum line for university. Matching the glassware to the level avoids over-specifying for a school demonstration and under-specifying for research separations. Map the set to the practical syllabus in use — Gaokao (NCEE), Cambridge/IB or a Ministry of Education curriculum — and confirm the current syllabus edition before citing it in a specification.
| Level | Typical setup | Joint type | Note |
| High school (Class 9-12) | Side-arm distillation flask + condenser | Cork/bung or 19/26 joint | Demonstrates simple distillation |
| Pre-university / college | Quickfit simple-distillation set | 24/29 interchangeable | Simple plus introductory fractional |
| University (undergraduate) | Quickfit set + fractionating column | 24/29 or 24/40 | Fractional and vacuum distillation |
| University (research) | Full interchangeable set + vacuum line | 24/40 standard taper | All distillation modes |
Caption: How distillation glassware differs by student level, from a school side-arm flask to a full research set.
How do you assemble and inspect a distillation set safely?
Assemble a distillation set from the heat source upward, inspecting every piece for damage, and never heat it as a sealed system. Safe assembly is as important as the glassware itself, because a cracked flask or a sealed apparatus is a direct hazard when heated. The rule and checklist below make the safe build sequence explicit and extractable.
The Open-System Rule for distillation: a distillation apparatus must never be heated as a sealed system. There must always be an opening to the atmosphere — at the receiver-adapter vent or an open receiving flask — so expanding vapour cannot build up pressure. Heating a closed glass system can cause it to burst. For vacuum distillation the system is closed only to a controlled vacuum line, never fully sealed.
1. Inspect every piece for chips, cracks and star fractures, and reject any damaged glass.
2. Confirm all ground joints are the same size and are clean and dry.
3. Lightly grease or fit PTFE sleeves on joints where required, and secure them with joint clips.
4. Clamp the round-bottom flask above the heat source, filled to between one-third and two-thirds.
5. Add anti-bumping granules to the flask before any heating.
6. Fit the still head and insert the thermometer so its bulb is level with the side-arm opening.
7. Attach the Liebig condenser with cooling water entering the lower end and leaving the upper end.
8. Fit the receiver adapter and clamp the receiving flask in place.
9. Confirm the apparatus has an open vent to atmosphere and is never a fully sealed system.
10. Check that all clamps are secure and the apparatus is stable before applying heat.
11. Start the cooling water before heating, and raise the heat gradually.
12. Record the glassware condition and set completeness in the laboratory inventory.
Caption: The twelve-step distillation-set assembly and pre-use inspection checklist, applied with the Open-System Rule.
What are the safety requirements for distillation glassware?
The safety requirements for distillation glassware are an open (never sealed) system, anti-bumping granules, crack-free glass, secure clamping, a suitable heat source and eye protection. Distillation combines heat, flammable vapours and glass under stress, so each requirement removes one of those risks. The table states each requirement, why it matters and the action to take.
| Safety requirement | Why it matters | Action |
| Never seal the apparatus | Sealed heating builds pressure and can explode | Keep a vent open to atmosphere |
| Add anti-bumping granules | Prevents sudden, violent boiling (bumping) | Add to the flask before heating |
| Inspect for cracks | Cracked glass fails under heat or vacuum | Reject chipped or cracked pieces |
| Secure clamping | Prevents the hot apparatus from falling | Clamp both flask and condenser |
| Correct heat source | A naked flame can ignite flammable vapour | Use a mantle or bath for flammables |
| Eye protection and screens | Splash or implosion risk | Wear goggles; use a safety screen for vacuum work |
Caption: The safety requirements for distillation glassware, with the reason and the action for each.
How much does distillation glassware cost?
The cost of distillation glassware depends on whether it is bought as a complete quickfit set or as individual pieces, the joint type, and the glass grade, so a single figure is not reliable. A complete simple-distillation set is generally more economical than buying each piece separately, while flasks are the main recurring cost because they are the most-broken item. The table sets out the cost basis and main cost driver for each item to support budgeting.
| Item | Cost basis | Main cost driver | Note |
| Quickfit distillation set | Per set | Number of pieces; joint type | Sets are cheaper than buying piecewise |
| Round-bottom flasks | Per flask | Capacity, neck count, wall thickness | Stock spares; most-broken item |
| Condenser | Per piece | Length and type | Liebig is the most economical |
| Fractionating column | Per piece | Vigreux or packed | Needed only for fractional work |
| Vacuum adapter and pump | Per setup | Vacuum capability | Only for vacuum distillation |
Caption: Cost basis and main cost driver for distillation glassware. Indicative basis only; prices vary by market, glass grade and volume — request a current quotation in your local currency (for example Renminbi or USD), include applicable taxes or import duty, and verify pricing before procurement.
Vendor evaluation criteria for distillation glassware
Evaluate distillation glassware vendors on a weighted scorecard that prioritises borosilicate 3.3 glass grade and accurate, interchangeable joints over price. The weighting below places the greatest emphasis on the glass grade and joint accuracy, because those two factors determine whether the glassware is safe to heat and whether the pieces actually fit together.
| Criterion | What to assess | Weighting (%) |
| Glass grade | Verified borosilicate 3.3 (ISO 3585 / ASTM E438) | 25% |
| Joint accuracy and interchangeability | Standard taper joints that fit across the set | 20% |
| Annealing and wall quality | Even walls; properly annealed; no stress | 15% |
| Set completeness | All components for the intended distillation type | 15% |
| Durability and spares | Heavy-wall option; spare flasks available | 10% |
| Packing and export logistics | Breakage-safe packing; lead time | 10% |
| Cost and order terms | Set and bulk pricing | 5% |
Caption: A weighted vendor evaluation scorecard for distillation glassware, totalling 100%.
Common mistakes when buying or using distillation glassware
Mistake 1: Using soda-lime glass instead of borosilicate 3.3
Soda-lime glass has a higher thermal-expansion coefficient than borosilicate 3.3 and is far more likely to crack under the heat of distillation. Specify borosilicate 3.3 glass to ISO 3585 or ASTM E438 Type I for every heated component.
Mistake 2: Mismatched ground-joint sizes
Distillation pieces with different ground-joint sizes will not connect, leaving gaps that leak vapour or fail to hold. Buy a matched interchangeable set with a single joint standard, such as 24/29 or 24/40, across all components.
Mistake 3: Sealing the apparatus with no vent
Heating a sealed distillation apparatus lets vapour pressure build until the glass bursts. Always leave an opening to the atmosphere at the receiver, and for vacuum work close the system only to a controlled vacuum line.
Mistake 4: Using the wrong condenser for distillation
Fitting a Graham coil or Allihn bulb condenser for straight distillation can trap and flood condensate, because those condensers are designed for reflux. Use a Liebig straight condenser for simple and fractional distillation.
Mistake 5: Placing the thermometer bulb in the wrong position
A thermometer bulb set too high or too low does not read the true vapour temperature, giving a wrong boiling point. Position the bulb level with the side-arm opening of the still head so it measures the vapour passing to the condenser.
Mistake 6: Overfilling the flask or omitting anti-bumping granules
A distillation flask filled beyond two-thirds, or heated without anti-bumping granules, can bump and eject hot liquid. Fill the flask to between one-third and two-thirds and add anti-bumping granules before heating.
Related resources and category pages
• Laboratory appliances (heating mantles, hotplates)
• Full educational and scientific lab equipment catalogue
Frequently asked questions
What glassware do you need for a simple distillation?
For a simple distillation you need a round-bottom flask, a still head (distillation adapter), a thermometer with adapter, a Liebig condenser, a receiver adapter and a receiving flask, all in borosilicate 3.3 glass with matched ground-glass joints. You also need anti-bumping granules and a heat source such as a heating mantle, water bath or burner with gauze. A quickfit simple-distillation set bundles these components with the right joints; browse the lab glassware range for options.
What distillation glassware is required for high school chemistry?
High-school chemistry typically requires a basic simple-distillation setup: a distillation flask (often a side-arm flask), a condenser, a thermometer, a receiver and a heat source, used to demonstrate separating a liquid from a solution. The exact list should follow the practical syllabus in use — Gaokao (NCEE), Cambridge/IB or a Ministry of Education curriculum. Confirm the current syllabus edition before finalising a school glassware specification, and choose borosilicate 3.3 glass for safety under heat.
Why must a distillation apparatus never be sealed?
A distillation apparatus must never be sealed because heating a closed glass system causes vapour pressure to build until the glass bursts, which can cause serious injury. There must always be an opening to the atmosphere, normally at the receiver adapter or an open receiving flask. For vacuum distillation the apparatus is closed only to a controlled vacuum line, never fully sealed, and a safety screen should be used.
How much does a distillation glassware set cost?
The cost of a distillation glassware set depends on the number of pieces, the joint standard, the glass grade and the order volume, so a fixed figure is not reliable. A complete quickfit set is usually more economical than buying each piece individually, and flasks are the main recurring cost because they break most often. Request a current quotation in your local currency (for example Renminbi or USD), include any applicable taxes or import duty, and verify pricing before procurement.
How do you clean and store distillation glassware?
Clean distillation glassware promptly after use by rinsing with a suitable solvent, then washing with warm water and lab detergent and rinsing with distilled water before drying. Separate ground-glass joints before storage so they do not seize, and store each piece padded and supported to prevent chipping. Inspect joints and flasks for cracks before the next use, and keep borosilicate glassware away from sudden temperature changes when cleaning. Browse replacement pieces in the chemistry lab equipment range.
What’s the difference between simple and fractional distillation glassware?
The difference is that fractional distillation glassware adds a fractionating column between the flask and the still head, while simple distillation uses the core set without one. The fractionating column provides extra surface area for repeated vaporisation and condensation, which separates liquids whose boiling points are close together. Simple distillation suits liquids whose boiling points differ by more than about 50 C, while fractional distillation handles closer-boiling mixtures such as ethanol and water.
Key takeaways
1. Distillation experiments use a round-bottom flask, still head, thermometer adapter, Liebig condenser, receiver adapter and receiving flask, plus anti-bumping granules and a heat source.
2. Distillation glassware should be borosilicate 3.3, which has a low thermal-expansion coefficient of about 3.3 x 10^-6 per K (per ISO 3585), giving the thermal-shock resistance heated glassware needs.
3. Use a Liebig straight condenser for simple and fractional distillation, and reserve Graham and Allihn condensers for reflux.
4. Fractional distillation adds a fractionating column, steam distillation adds a steam source, and vacuum distillation adds a vacuum take-off adapter and pump.
5. Follow the Open-System Rule: never heat a sealed distillation apparatus, because trapped vapour pressure can burst the glass.
6. Match ground-joint sizes across the set, apply the twelve-step assembly checklist, and source components from the lab glassware and chemistry lab equipment ranges.
About Edu Lab China
Edu Lab China is a manufacturer and exporter of educational and scientific laboratory equipment headquartered in Zhengzhou City Hi-Tech Development Zone, Henan, China, supplying schools, colleges, universities and government institutions across more than 50 countries worldwide. The company states that its products are manufactured under the guidelines of ISO 9001, ISO 13485 and ISO/IEC 17025, with credentials including CE marking, RoHS, REACH and UL and ETL listing. Its range spans lab glassware, chemistry, physics and biology lab equipment, burners, laboratory appliances and measuring glassware used in distillation and other practicals. For bulk supply, tender documentation and OEM enquiries, contact the Edu Lab China procurement team.