Handle Reagents Safely and Easily with HAWACH Bottle-Top Dispenser

The manual or electric bottle-top dispenser produced by HAWACH is a valuable tool to aliquot reagents, whose built-in safety features protect users from accidental spills. The bottle-top dispenser ensures quick, reliable and safe dispenser operation.

Notable exceptions
The HAWACH bottle-top dispenser is made of Optical glass, Al2O3, ETFE, PFA, FEP, PTFE, platinum-iridium alloy, and PP (hard hat) and it can dispense nearly any laboratory chemical. The notable exceptions are:

Sodium azide: Found in many biology labs, and used as a preservative for buffers. It removes the fluorine in PFA, FEP, Teflon and other Teflon-like materials. As sodium azide is often used in solution with other chemicals, confirm the compatibility of all components of the liquid before use.
Bromine: Bromine is too dense to be dispensed by HAWACH bottle-top dispenser.
Carbon Disulfide: Carbon disulfide presents an explosion risk, and should never be dispensed by a HAWACH bottle-top dispenser.

Suspensions: The HAWACH bottle-top dispenser should not be used to dispense liquids that contain particles, as they will clog or damage the insides of the instrument.

Usages and characteristics
HAWACH bottle-top dispenser has a wide application base in many professional labs, like chemical, biology, clinical, pharmaceutical and forensic labs, which can be used with a variety of liquid reagents. Meanwhile, it provides superior sealing for a wide range of temperatures and viscosities.

According to GLP and ISO 9001 standards, adjustments and calibrations can be completed in seconds. Changes to factory settings are automatically prompted by a red calibration (marker) plate. It is easy to disassemble and clean, equipped with replaceable inlet and outlet valves, including valve ball. The valve module can be rotated 360 ° to ensure that the bottle label is always facing the user and helps to operate safely.

HAWACH bottle-top dispenser is available in different volume ranges:
Manual models: 0.5-5ml, 1-10ml, 2.5-25ml, 5-50ml
Electric models: 0.1-99.9ml
Welcome to contact HAWACH to learn more bottle-top dispensers and other lab tools.

Physical Limitations
Any liquid that has a density of over 2.2 g/cm³ can not be dispensed, as it will be denser than the borosilicate glass filling valve, and the ball will float, preventing it from closing. Liquids that are too thick will tend to clog it, impair valve function, piston movement, etc. for instance, the concentrated hydrochloric acid, nitric acid, chlorinated hydrocarbons and fluorinated hydrocarbons and liquids that can form precipitates.

The working temperature should also be considered. For hot applications, the main consideration is that liquids (such as agar) are usually dispensed at higher temperatures because the viscosity of the liquid decreases at these temperatures.

When the liquid cools, these types of liquids can clog the HAWACH bottle-top dispenser.

500+ mbar vapor pressure or extremely volatile liquids: Liquids that have a high vapor pressure tend to vaporize inside the dispenser, causing the liquid to flow out of the dispenser even when the instrument is not being operated. A common volatile liquid is nail polish remover, which has a vapor pressure of 184 mbar at room temperature and works properly. Diethyl ether has a vapor pressure of ~450 mbar at 20°C, so it can be dispensed with a HAWACH bottle-top dispenser, but it would not be recommended if the room temperature was significantly higher.

Others also include nicotinic acid, trifluoroacetic acid, tetrahydrofuran. If you are not sure whether the solution is suitable for the bottle-top dispenser, please contact HAWACH.