How to choose a fume hood when using formaldehyde for experimental operation?
Formaldehyde, chemical formula HCHO, formula amount 30.03, also known as formic aldehyde. It is a colorless gas with a special irritating odor. It has a stimulating effect on the human eye and nose. The relative density of the gas is 1.067 (air = 1) and the liquid density is 0.815 g/cm3 (-20 ° C). Melting point -92 ° C, boiling point -19.5 ° C. Soluble in water and ethanol. The concentration of the aqueous solution is up to 55%, usually 40%. It is called formalin, commonly known as formalin, and is a colorless liquid with a pungent odor.
When the laboratory conducts formaldehyde experiments, if the operator is exposed to a higher concentration of formaldehyde vapor, it will cause systemic diseases mainly caused by damage to the eyes and respiratory system. When the symptoms are mild, it is characterized by eye and upper respiratory tract irritation, such as eye tingling, tearing, sore throat, chest tightness, cough, etc.; mild poisoning, blurred vision, dizziness, headache, fatigue and other systemic symptoms; Poisoning, there will be persistent cough, hoarseness, chest pain, difficulty breathing, chest X-ray examination, will find scattered, patchy or patchy shadows; severe poisoning can cause coma and even shock.
It can be seen that how to avoid the inhalation of formaldehyde vapor by the operator during the formaldehyde experiment is essential to protect the health of the operator.
At this time, choose a clean air fume hood that suits you, which can effectively remove and remove harmful substances generated during the experiment, and protect the operator.
Different from the traditional fume hood, the top of the ductless fume hood is equipped with a fan and a filtering device. The fan operates to create a negative pressure inside the cabinet, and the airflow enters from the air inlet. The filter adsorbs and removes harmful substances in the airflow, and then the safety airflow circulates. Emit back into the laboratory to ensure that the laboratory operator inhales clean air.
The adsorption effect of the filter is crucial. On the one hand, depending on the surface wind speed, the surface wind speed needs to be maintained at 0.4-0.6 m/s to ensure the adsorption; on the other hand, the quality of the high-efficiency activated carbon is very important, and it is necessary to select activated carbon suitable for adsorbing formaldehyde gas.
The French standard AFNOR NF X 15-211 is the authoritative international fume hood certification standard. Selecting a clean air fume hood that meets this standard ensures that your experiment is flawless.
France's original Labopur brand fume hood, for the formaldehyde gas, specializes in the FOR series of high-efficiency activated carbon filters, with 30 years of product manufacturing experience, the most rigorous testing to ensure the quality of the product is stable and reliable, is the ideal for your experimental operation The choice.
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