Do you know why 502 glue is called 502?
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There are a wide variety of glues available on the market these days, and their functions are becoming increasingly sophisticated. As for which glue is the most commonly used, many people would say it’s definitely 502. Although 502 glue sometimes causes minor discomfort to many people through accidental use, it is very popular in the market due to its excellent bonding properties and low cost. But at the same time, some people have raised the question: why is 502 glue called “502” and not “520”? Have you ever had such questions too? Let’s find out together.
In the early 19th century, artificially chemically synthesized adhesives were introduced. Chemists gradually developed various new types of bonding materials based on phenol-formaldehyde resins, and these new adhesives quickly changed the traditional production methods in certain industries. Whereas in the past riveting or welding was required between some metal materials, powerful adhesives can now be used directly to achieve the same result; this not only improves production efficiency but also facilitates the miniaturization and weight reduction of products. Today, in virtually every industry across society, adhesives are indispensable – whether it’s airplanes in the sky, cars and high-speed trains on land, or even in medical procedures and tissue repair, where special medical adhesives are used. If you were to say that our world is held together by glue, you’d think that makes sense as well; for us ordinary people, 502 is still the most commonly used glue.
502 is a colorless and transparent liquid synthesized primarily from ethyl α-cyanoacrylate, along with additives such as thickeners, stabilizers, and toughening agents. It has the advantages of being volatile, polymerizing and curing upon contact with even trace amounts of moisture, having a fast curing speed, being easy to use, offering strong adhesion, and allowing for wide-ranging applications as an adhesive material. I used to think that 502 was produced abroad, but in fact it was invented by the Chinese themselves, and that’s already been over 50 years ago. In 1959, an American company invented a new type of glue that quickly became popular around the world – this was the quick-drying glue ； Someone in China at that time also took notice of this invention; that person was Ge Zengbei, who took on the task of developing a quick-drying adhesive for China. Finally, in 1964, at the Institute of Chemistry of the Chinese Academy of Sciences in Beijing at that time, Ge Zengbei developed China’s own quick-drying adhesive.
As for the naming of this quick-drying adhesive, there are many different answers; several versions exist. I. Some people say that this glue was developed after 502 experiments, which is why it is called 502. II. Some also say it is named according to the type of groups in the adhesive components. III. Some also say that the room number where this glue was developed is Room 502, which is why it was named 502. Finally, such a statement was found in the CCTV documentary \"Decoding the History of Technology – The World of Adhesives\": the quick-drying adhesive developed by Ge Zengbei was named KH502, where \"KH\" was the abbreviation for the Institute of Chemistry of the Chinese Academy of Sciences at that time, and \"502\" was the room number of the laboratory where it was developed.
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