You may use "502 glue" every day, but have you ever thought about:Why is it called 502? Does 502 exist abroad? What do numbers like 401 and 406 represent?
This article explains it all clearly and will help you understand.Differences in domestic and international terminology + Practical purchasing tipsTo avoid making the same mistakes again.
1. Why is 502 glue called "502"?
"502" doesn't actually have a chemical meaning, but rather...Formula number during research and development。
During the development process, different formulations are distinguished by numbers. When the formulation with the number "502" performs the best (high bonding strength, fast curing, and good stability), it is finalized and used directly as the product name.
In short:502 = Successful recipe number.
II. Is there any "502 glue" available abroad?
There are similar products, but they are generally not called "502".
The essence of 502 glue is:
- cyanoacrylate glue
- Also called instant glue/fast-drying glue
Abroad, this type of glue is usually called:
- Super Glue
- Instant Glue
- CA Glue（Cyanoacrylate）
Key differences:
| Comparison items | China (502) | Overseas (Super Glue) |
|---|---|---|
| Naming conventions | Formula number (502, 401, etc.) | Functional naming (Super Glue) |
| Whether to unify standards | ❌ Inconsistent | ❌ Not uniform |
| User perception | Treating "502" as a type of glue | Treat "super glue" as a product category |
| Product Differences | Model distinctions are detailed (e.g., 401/406). | Further categorization by application (gel/liquid, etc.) |
Simply put:
502 = Chinese name; Super Glue = international name
III. What are some common types of digital glue?
1️⃣ Instant glue (most common)
| model | Features | Applicable Scenarios |
|---|---|---|
| 502 | General-purpose type | Routine repairs |
| 401 | It is thinner and has stronger permeability. | Precision components |
| 406 | Suitable for rubber and plastics | Shoes, soft materials |
| 495 | Industrial grade strength | Structural bonding |
⚠️ Note: Numbers vary by brandNot entirely universal。
2️⃣ AB glue (two-component)
- 101 / 102
- 201 / 202
👉 Requires mixing; high strength but slow curing.
3️⃣ Epoxy resin adhesive
- E-44
- E-51
4️⃣ Hot melt adhesive
- HM-100
- HM-200
IV. Adhesive Selection Guide for Different Scenarios (Practical Version)
🧰 Routine repairs
recommend:502 / 401
👟 Shoes/Rubber
recommend:406 or shoe glue
Don't use 502 glue!
🔩 Metal / High Strength
recommend:AB glue
🧴 Seam filling
recommend:Epoxy Putty
📱 Precision components
recommend:401 / 403
👜 Leather (Key Point)
| type of glue | Is it recommended? | illustrate |
|---|---|---|
| Leather glue/Shoe glue | ✅ Recommended | Soft and flexible |
| 406 | 🟡 Available | Small-scale emergency |
| 502 | ❌ Not recommended | It will harden and crack. |
V. The most common pitfalls
- ❌ Using super glue (502) to glue shoes → They will crack very quickly.
- ❌ Using super glue (502) on large areas → will make it brittle.
- ❌ Using super glue for structures → Not strong enough
Core principle: Instant adhesives are responsible for "speed," while structural adhesives are responsible for "firmness."
VI. Conclusion
Digital glue may look complicated, but the logic is actually quite simple:
- 502 is just a formula number.
- This type of adhesive is used all over the world, but it's called by different names.
- The key to choosing adhesives is their intended use, not just the numbers.
Remember: Choosing the right adhesive is more important than remembering the model number.
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