Not all “soft rubber” is the same. Learn the key differences between Silicone, TPU, and NBR suction cups, and how to choose the right one for your project.
Many people think suction cups are simply made of “soft rubber.”
In reality, the material and formulation determine how safe, durable, and reliable they are. Choosing the wrong material can lead to costly problems—like permanent marks on car paint.
| Material | Airtightness | Durability (Aging) | Best Use Case | Cost Level | Notes |
|---|
| Silicone | Low | Weak | Short-term handling (≤10 min) | Low | Can leave marks on surfaces if misused |
| TPU | Medium | Moderate | Flexible mounting, surface protection | Medium | Good balance of softness & strength |
| NBR | High | Strongest | Long-term fixation (car mounts, cameras) | Higher | Best airtightness & aging resistance |
Silicone
- Loose molecular structure → weaker airtightness.
- Holding time is only about one-third of TPU or NBR.
- Best for short-term industrial handling tasks.
TPU
- Offers flexibility and decent airtightness.
- More durable than silicone, but not as strong as NBR for long use.
- Works well when surface protection is important.
NBR (Nitrile Rubber)
- Proven by aging tests → best airtightness and durability.
- Ideal for long-term fixation like automotive mounts or camera equipment.
- Higher cost, but safest for demanding applications.
Quick Guide to Choosing
- Usage Time: Short (<10 min) → Silicone; Long → NBR.
- Application Needs: Surface protection → TPU.
- Budget: Price sensitive → Silicone/TPU; Safety priority → NBR.
The true strength of a suction cup lies not in how “soft” it feels, but in the material behind it.
If you’re unsure which material fits your project, contact FSTE Vacuum Technology. With over 10 years of experience, we’ll help you choose the right solution before small details turn into big problems.