introduce
The test tubes are divided into ordinary test tubes, test tubes with branches, and centrifuge test tubes.
The specifications of ordinary test tubes are expressed by outer diameter (mm) × length (mm), such as 15×150, 18×180, 20×200, etc. Centrifuge test tubes are expressed in milliliters of capacity.
Material: glass
modeling
Corked test tube
(1) The flat-mouth test tube is a flat-mouth glass tube with a round bottom, and the mouth of the tube is melted. Flat mouth, easy to disinfect and kill bacteria in the mouth.
(2) The roll mouth test tube is a round bottom glass tube with a curled edge (or round mouth) at the mouth. The roll mouth (or round mouth) is used to increase the mechanical strength and at the same time facilitate clamping and not easy to fall off.
(3) Fermentation test tube It is a flat and round bottom test tube with a small diameter and a short diameter (6mm diameter and 30mm length).
(4) A test tube with a side branch is a flat test tube with a side branch tube. Its side branch tube is mainly used to connect with the suction tube. Receiving bottle for microfiltration. Graduated test tube: The shape is a round test tube. The volume scale marking line is engraved on the tube body, which can directly read the measurement number, which is convenient to use.
Main purpose editing Voice
(1) Take liquid or solid reagents.
(2) Heat a small amount of solid or liquid.
(3) Prepare a small amount of gas reactor.
(4) Collect a small amount of gas.
(5) A solute that dissolves a small amount of gas, liquid or solid.
(6) Used as a container during centrifugation.
(7) Used as a reaction container for a small amount of reagents, used at room temperature or heating.
Notes for use edit Voice
(1) Do not exceed 1/2 of the test tube capacity when filling the solution, and not exceed 1/3 of the test tube capacity when heating.
(2) When using a dropper to drop liquid into the test tube, it should be suspended in the air, and it should not be extended into the test tube mouth.
(3) Use tweezers to hold the solid solid to the test tube mouth, and then slowly erect the test tube to slide the solid into the bottom of the test tube. Do not let the solid fall directly to prevent the bottom of the test tube from rupturing.
(4) Use test tube clamps for heating, and the test tube mouth should not face people. When heating the test tube containing the solid, the mouth of the tube is slightly downward, and when the liquid is heated, it is inclined about 45°.
(5) The heating should be even to avoid bumping or bursting of the test tube.
(6) After heating, it cannot be quenched to prevent cracking.
(7) Preheat when heating to prevent the test tube from bursting due to sudden heat.
(8) When heating, keep the outer wall of the test tube free of water droplets to prevent uneven heating and bursting.
(9) After heating, do not wash the test tube before it has cooled to room temperature.
(10) When using the test tube clamp to clamp the test tube, put the test tube clamp up from the bottom of the test tube and clamp it on the middle and upper part of the test tube. Within one of the positions is reasonable.
(11) External flame is used for heating.
