Organic experimental glassware can fall into two categories: standard grinding and general glassware according to the standard of its mouth plug and grinding.
Since the standard grinding glassware can be connected to each other, their use is time-saving and strict and safe, and it will gradually replace the general glassware instruments.
We should be handled with care when using glassware. Glassware Instruments that are easy to slide (such as round bottom flasks) should not be placed overlapping to avoid breakage.
General glassware
Except for a few glassware, such as test tubes and beakers, it is generally not possible to heat directly with fire. Conical flasks are not pressure resistant and cannot be used for decompression. Thick-walled glassware (such as suction filter bottles) is not heat-resistant and therefore cannot be heated. Wide-mouth containers (such as beakers) cannot store volatile organic solvents.
After the glassware with the piston has been washed, a piece of paper should be placed between the piston and the grinding port to prevent sticking. If it is stuck, apply a lubricant or organic solvent around the grinding ring, then blow the hot air with a hair dryer, or boil it with water and then tap the plug with a wooden block to loosen it.
In addition, it is not possible to use a thermometer as a stir bar or to measure temperatures above the scale. The thermometer should be slowly cooled after use. Do not rinse immediately with cold water to avoid bursting.
For organic chemistry experiments, it is best to use a standard ground glass instrument. This type of instrument can be connected to the same number of grinding ports to eliminate the need for plugging and drilling, and to eliminate contamination of the reactants or products by cork or rubber stopper.
The size of the standard ground glassware is usually indicated by a numerical number, which is the stain of the plug (or rubber stopper). The size of the standard ground glassware is usually indicated by a numerical number, which is the millimeter integer of the maximum diameter of the grinding port.
Commonly used are 10, 14, 19, 24, 29, 34, 40, 50 and so on. Sometimes it is also represented by two sets of numbers, and another set of numbers indicates the length of the grind. For example, 14/30 means that the diameter of the grinding point is 14 mm at the maximum and the length of the grinding mouth is 30 mm.
The same number of grinding and grinding plugs can be tightly connected. Sometimes two glass instruments, if they cannot be directly connected due to different grinding numbers, can be connected by means of different numbered grinding joints (or size heads) [see Figure 2.2(9)].
Note: The number of the grinding series is usually expressed in integers, which is slightly different from the diameter of the large end of the actual grinding cone. The following is a comparison of the number of the grinding ring and the diameter of the large end.
NO. 10 14 19 24 29 34 40
Outside diameter(mm) 10.0 14.5 18.8 24.0 29.2 34.5 40.0
Please note when using standard glassware:
(1) The grinding mouth must be clean. If there is solid debris, the grinding mouth will not be tightly connected and cause air leakage. If there are hard objects, it will damage the grinding.
(2) Wash and disassemble after use. Otherwise, if it is placed for a long time, the joint of the grinding ring will often stick and it is difficult to disassemble.
(3) There is no need to apply lubricant to the general-purpose grinding to avoid contamination of the reactants or products. If there is a strong base in the reaction, a lubricant should be applied to prevent the joint of the grinding joint from sticking due to alkali corrosion and cannot be disassembled. When vacuum distillation, the grinding mouth should be coated with vacuum grease to avoid air leakage.
(4) When installing the standard grinding glassware, it should be ensured that it is correct, tidy, and stable so that the joint of the grinding joint is not subject to the stress of skewing, otherwise the instrument will be easily broken, especially when heating, the glassware is heated and the stress is greater.
If you have any questions, please feel free to communicate with laboratory glassware manufacturer WUBOLAB
