Dear Valued Client,
We fully understand that purchasing inferior or counterfeit PU sealant can directly lead to poor project quality, high rework costs, and even damage to your business reputation. To ensure you receive truly reliable products with every purchase, we have prepared this quick identification guide for you. The value of genuine, high-quality PU sealant lies not only in its price but, more importantly, in the peace of mind and assurance it provides.
Here are 5 key checkpoints you can perform immediately upon receiving the goods:
- Inspect the Packaging: The Devil's in the Details
| Genuine PU sealant | Inferior products |
| Packaging extremely tight, typically featuring a high-quality aluminum foil inner seal that requires significant force to puncture when opening the container | thinner foil seals or poor sealing. |
- Smell the Odor: The First Olfactory Warning
| Genuine PU sealant | Inferior Product |
A slight, characteristic chemical smell specific to PU material, but it is not pungent or irritating. | Often contains excessive cheap solvents, emitting a strong, sharp, unpleasant odor that can even cause dizziness. |
- Examine the Paste: Secrets of Texture and Color
Appearance & Viscosity:
After opening the container, high-quality PU sealant paste should be fine, uniform, smooth, with no obvious granules or impurities. When lifted with a stirring rod or spatula, the paste should flow down slowly in a viscous manner—its fluidity should be moderate, not thin like water.
Color: High-quality PU sealant (especially white) has a pure, stable color. Inferior products may appear abnormally pale or dull due to excessive filler content.
- Key Technique - Alcohol Test: Quickly Distinguish PU from MS Sealant
Method: Apply the sealant onto a piece of cardboard and immediately smear a small amount of medical alcohol (e.g., rubbing alcohol) over part of the bead (no need to soak, a light smear is sufficient).
| Genuine PU Sealant | MS Sealant or Other Types |
| The area where alcohol is applied will have its surface curing reaction inhibited by the alcohol, causing that area to remain tacky and non-drying for a long time, potentially indefinitely. | Alcohol has almost no effect on its curing process; the area where alcohol was applied will cure and dry normally like the surrounding sealant. |
Explanation: This quick test is based on the unique moisture-curing principle of PU sealant and effectively helps prevent MS sealant (often more cheap) from being passed off as PU.
- Test Performance: Simple Practical Verification
Curing Test (Most Critical):
Apply a small amount of sealant onto cardboard or glass, spreading it into a thin layer.
| Genuine PU Sealant | MS Sealant or Other Types |
Will form a flexible, non-tacky, smooth skin where exposed to air within approximately 24 hours. | may exhibit various issues: remaining uncured for a long time (staying sticky inside), becoming brittle after curing (breaking easily when pulled), or cracking/powdering. |
Adhesion Test (After Full Cure):
After the sealant has fully cured (about 48-72 hours), try to peel it off by hand. High-quality PU sealant will demonstrate excellent elasticity and adhesion, making it difficult to peel off entirely and maintaining strength even when stretched.
Your Recommended Action:
The most reliable method is always to insist on receiving and testing a sample before placing a bulk order.
Topsen guarantees that all the above identification points are strictly met by our products. We particularly encourage you to use the "Alcohol Test" trick to evaluate our sample, as it visually demonstrates the product's authentic properties. We firmly believe that true quality can withstand the most rigorous tests.