What Are The Safety Protection Measures for Conducting High-temperature Experiments in Fume Hoods?

When conducting high-temperature experiments in a fume hood, the following safety protection measures should be taken:

Before the experiment, check the performance of the fume hood: Before the experiment starts, it is necessary to confirm that the fume hood is in operation. Check whether all switches and pipelines such as power supply, water supply and drainage, and gas are normal. Turn on the lighting equipment and check whether the light source and the interior of the cabinet are normal. Turn on the exhaust fan and listen for about 3 minutes to see if the operation is normal. If any problem is found, the use should be stopped and the relevant department or personnel should be notified for handling.

Take good personal protective measures: Laboratory personnel should wear work clothes, gloves and goggles. When necessary, they should also wear protective face masks and gas masks. When using electric furnaces or operating high-temperature equipment, protective gloves must be worn to avoid direct contact with overheated instruments by hands and causing burns.

Standard operation window: Move the upper and lower Windows slowly and gently to avoid hasty operation. In the experiment, the height of the window from the table surface should be 100 to 150mm, which can not only ensure the ventilation effect but also protect the upper part of the operator's chest. At the same time, personnel should keep a distance of 15cm from the fume hood. Their heads and upper bodies must not be inserted into the hood.

Proper placement of experimental items: Do not place any equipment or reagents within 150mm of the glass window. When placing large-sized instruments and equipment in the fume hood, sufficient space should be left and no items should be piled up around to ensure that the air flow is not affected. When conducting high-temperature experiments, ensure that the experimental items and equipment are placed at a sufficient distance from the regulating door to prevent them from falling or affecting air flow.

Control experimental conditions: Strictly control experimental conditions such as temperature, pressure, reaction time, etc. Avoid reagent leakage or intense reaction due to out-of-control reaction conditions. High-temperature experiments must not come into contact with water. If water is mixed into a high-temperature object, it will vaporize rapidly, causing what is called a water vapor explosion.

Avoid placing incompatible items in the fume hood: It is prohibited to conduct experiments that are incompatible or have an impact on each other in the fume hood to prevent danger.

Continuous exhaust after the experiment: Before the experiment ends, the fan should continue to run for at least 5 minutes before being turned off to ensure that all residual gases in the pipeline are completely discharged and prevent the accumulation of residual harmful gases in the fume hood.

Clean the fume hood: After use, clean the reagents, chemicals, instruments and equipment, etc., and wipe the inside and outside of the hood clean. If there is pollution, warning signs should be posted and other people should be informed to avoid unnecessary harm. After that, close all the switches and Windows.

Pay attention to the temperature and humidity in the laboratory: Generally, the temperature in the laboratory should be controlled at 23±5℃, and the humidity at 60±15%. Under high-temperature weather conditions, the working hours of laboratory personnel should be reasonably arranged to avoid conducting long-term and high-intensity experimental operations during high-temperature periods. Try to avoid conducting experiments with low-boiling-point hazardous chemicals, high-temperature and high-pressure equipment and other highly dangerous activities during high-temperature periods such as noon.