Precautions for the use of laboratory cryovials
Laboratory tubes are commonly used instruments in chemical laboratories. They are used as reaction vessels for small amounts of reagents and are used at room temperature or heated. Laboratory test tubes are divided into ordinary laboratory test tubes, laboratory test tubes with branches, and centrifuge laboratory test tubes.
Precautions for the use of laboratory test tubes:
(1) Do not exceed 1/3 of the laboratory tube capacity when filling the solution, and do not exceed 1/3 of the laboratory tube capacity when heating.
(2) When dripping the liquid into the laboratory tube with the dropper, it should be suspended in the air and should not protrude into the laboratory tube mouth.
(3) Take the block solid, clamp it on the mouth of the test tube with tweezers, and then slowly erect the test tube to make the solid smooth.
Enter the bottom of the lab tube without letting the solids fall directly to prevent the bottom of the lab tube from rupturing.
(4) Use the test tube clamp to heat, and the test tube mouth should not face people. When heating laboratory tubes containing solids, the nozzle is slightly downward, and when heating liquids, the nozzle is inclined at about 45°.
(5) The heating should be uniform to avoid bumping or bursting.
(6) After heating, it cannot be cooled quickly to prevent cracking.
(7) Preheating during heating to prevent the laboratory tube from bursting suddenly.
(8) When heating, keep the outer wall of the laboratory tube free of water droplets to prevent it from bursting due to uneven heating.
(9) The heated test tube should not be cleaned until it has cooled to room temperature.
(10) When using the test tube clamp to clamp the test tube, clamp the test tube clamp upward from the bottom of the test tube to the test tube
Upper, if the tube length is divided into three equal pieces, it is reasonable to clamp the tube clamp within one third of the end of the tube.
