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Can you supply a larger Findenser?
Can Findenser be repaired if it breaks?
Can Findenser be repaired if it breaks?
The glass body of a Findenser can be repaired, provided it has a serial number beginning with ‘F’ (supply started December 2020). Unfortunately it is not possible to repair any Findensers with a serial number beginning with ‘S’ (supply pre-December 2020).
To get your Findenser repaired you will need to:
- Place a Purchase Order for Cat No.RR31120 ‘Findenser Repair’ directly with Radleys or via your local Distributor.
- After acknowledgement of your Purchase Order, please ship (at your cost) the Findenser to Radleys:Radleys - Findenser Repair Shire Hill Saffron Walden, Essex, CB11 3AZ. United Kingdom.
- Taking care to pack your Findenser carefully to avoid breakage during shipping.
- Include a Decontamination Certificate.
- Include a copy of your Purchase Order.
- Include details of your return postal address.
- Include your email address.
During the repair Radleys will:
- Replace the glass body, thermofluid and all seals.
- Repack in a new box with instructions.
- Ship (at our cost) the repaired Findenser to you, within approximately a week of receipt of the damaged unit
- This repair can only be carried out by Radleys.
- Any attempt to repair elsewhere will invalidate your Warranty and is likely to lead to inferior performance.
What is the chemical resistance of Findenser?
General guidanceFindenser is resistant to the majority of solvents and splash-resistant to dilute acids and alkalis at room temperature. Extended exposure to acids or alkalis will attack the outer metal surface of the Findenser. It is important to clean off any chemical spills immediately after they occur.
Further detailThe inner body of Findenser and the cone/socket, i.e. the wetted parts that come into contact with the substance being evaporated during normal use, are borosilicate glass 3.3, which has very good chemical resistance. (See TB 101 Glass Technical Data sheet available here for further details.) The metal finned jacket is anodised aluminium and the plug and seal are acetal and HT silicone. Please consider the chemical compatibility of your chemicals with these materials. You can consult chemical resistance tables online. It is not feasible for our R&D Laboratory to test Findenser with every possible chemical, so we cannot provide data. As well as wiping off any spills, ensure there is not a significant concentration of corrosive chemical vapours in the air around the Findenser (e.g. by using the Findenser within our guidelines, so the solvent is retained in the Findenser/flask). There is an advised cleaning protocol detailed in the FAQ entry, ‘Should I clean my Findenser? If yes, how?’
What is the optimum volume of solvent to be used in a flask with Findenser?
What is the maximum recommended volume of solvent for use with Findenser?
- Findenser: Maximum flask size 2 litres, maximum solvent volume 1 litre.
- Findenser Mini: Maximum flask size 250 ml, maximum solvent volume 125 ml.
Will Findenser work in a warm lab?
Can an inert gas flow be used with Findenser?
Can I use Findenser to condense diethyl ether?
Can you supply a Findenser with a B29 joint at both ends?
- RR31102: Findenser B29 Cone, B24 Socket – 400 mm long
- RR139142: Enlarging Adapter Ordinary B24 to B29 (to fit in at the top, to enlarge the B24 socket to B29).
Is there any performance data for the Findenser Mini?
What is the maximum solvent boiling point for use with Findenser?
What are B joints (B29, B24, B19 and B14 etc.)?
They have a standard taper (1:10 – for every 10 mm down the cone/socket, the diameter gets smaller by 1 mm). The ‘B’ differentiates them from American ‘A’ joints, which have the same maximum diameter and taper but are longer – e.g. A29 is A29/42, and A24 is A24/40. B joints are also sometimes referred to as ‘NS’ joints instead, so you may be familiar with that term – e.g. B29 (B29/32) is the same as NS 29/32, and B24 (B24/29) is the same as NS 24/29.
How can I improve the performance of my Findenser?
Too much solvent
- If a flask is too large or over-filled, the condensation load on the Findenser could exceed its ability to cool and condense effectively. In such circumstances, Findenser may not contain the solvent.
- Working solvent volumes should be a maximum of half the flask volume, e.g. 5 ml in a 10 ml flask, or 1 L in a 2 L flask.
- The maximum recommended solvent and flask volume for use with each type of Findenser is:
- Standard (full-length) Findenser: maximum flask size 2 L, with maximum solvent volume 1 L
- Findenser Mini: maximum flask size 250 ml, with maximum solvent volume 125 ml.
Overheating or poorly regulated heating
- There is no benefit to the chemistry in overheating the solvent as the chemistry cannot get any hotter than the solvent boiling point, no matter how high the temperature. Overheating will simply generate more vapour, which could be beyond Findenser’s capacity to condense.
- The hotplate or block temperature should be no more than 20°C above solvent boiling point for high boiling point solvents (>80°C), or 10°C above boiling point for lower boiling point solvents (<80°C).
- Where an oil bath is used, the hotplate or oil bath temperature should be no more than 10°C above the boiling point of solvent for high boiling point solvents (>80°C), or no more than 5°C above boiling point for lower boiling point solvents (<80°C).
- In all cases, extra care should be taken if the heating control is not fully calibrated, or does not have precise settings.
Inert gas flow encouraging evaporation
- A flow of inert gas (e.g. nitrogen) through the flask can encourage evaporation and reduce performance of the Findenser.
- If inert gas is required it should be introduced through the top joint of the Findenser, with all flask ports sealed (using a suitable bubbler to avoid build-up of pressure) and not through a flask sidearm or joint at the bottom of the Findenser. Gas flow should be kept to a minimum.
Ambient temperature too similar to solvent boiling point temperature
- Because Findenser uses air to cool and dissipate heat, it requires the ambient air temperature (room temperature) to be significantly cooler than the boiling temperature.
- At relatively high ambient temperatures, there may be insufficient air cooling for the heat from the Findenser fins to be effectively dissipated, which may result in Findenser not containing the solvent.
- The performance in each case will depend on how different the ambient air temperature is from the boiling point temperature, so there should not be a problem with condensing high boiling point solvents.
- To maximise performance, keep the lab cool if possible, and ensure there is sufficient airflow around the Findenser to enable effective heat dissipation.
Very low boiling point solvent, e.g. diethyl ether
- Some very low boiling solvents (particularly in large volumes) are just too difficult to condense with any kind of air condenser. In such circumstances a water-cooled condenser may be the only option.
- Findenser can cope with smaller volumes of diethyl ether (up to 100 ml in a 250 ml flask) with a hotplate / heating block accurately controlled at no more than 5°C above boiling point.
Can Findenser be stored at 0°C or lower?
The Findenser literature says, ‘operating temperature range: 0°C to 60°C’. What does this mean?
Can you supply a Findenser without water sealed inside?
Should I clean my Findenser? If yes, how?
- Flush the internal glass surfaces with a suitable cleaning solvent such as acetone or IMS. This is best achieved with a wash bottle. External exposed glass surfaces may also be cleaned with a suitable solvent. Allow washing solvent to drain into a suitable receptacle.
- Wash the whole Findenser assembly in warm soapy water, using a soft brush to clean fins.
- Rinse with warm water both internally and externally.
- Allow to air dry.