## Common ground
All options refer to vibration dampers—devices that reduce or absorb mechanical vibrations in machinery, vehicles, or equipment.
## Options at a glance
**3917.29 – Silicone plastic damper**
- **Defining trait:** Made primarily of silicone plastic; used as a car replacement part.
- **Typical examples:** Rubber-like mounts for engine components, dashboard isolators.
- **Best fit when:** The product is a molded silicone part replacing worn automotive components.
**3926.90 – Thermoplastic elastomer damper**
- **Defining trait:** Made from thermoplastic elastomers (TPEs) blended with silicone, PVC, or other plastics.
- **Typical examples:** Flexible mounts for appliances, vibration isolators in HVAC systems.
- **Best fit when:** The damper is a flexible, moldable component made from mixed plastic materials.
**4008.11 – Cellular rubber damper**
- **Defining trait:** Made of open- or closed-cell rubber foam; lightweight and compressible.
- **Typical examples:** Insulating pads under machinery, noise-reducing floor mats.
- **Best fit when:** The product is a soft, porous rubber structure designed for shock absorption.
**4016.99 – Vulcanised rubber silencer/damper**
- **Defining trait:** Made of vulcanised (chemically cured) rubber; often used as a silencer or high-durability damper.
- **Typical examples:** Engine mounts, exhaust hangers, industrial vibration isolators.
- **Best fit when:** The product is durable, heat-resistant, and designed for heavy-duty mechanical use.
**5911.90 – Technical textile damper**
- **Defining trait:** Made from cut-to-size fabric of polyester, cotton, or aramid fibers; used in audio or vehicle components.
- **Typical examples:** Speaker cone dampers, vibration-reducing fabric layers in car interiors.
- **Best fit when:** The product is a textile-based layer used to dampen vibrations in speakers or vehicle parts.
**7326.90 – Iron/steel damper**
- **Defining trait:** Made of ferrous metal; typically rigid and structural.
- **Typical examples:** Heavy-duty engine mounts, industrial frame supports.
- **Best fit when:** The product is a metallic, load-bearing damper for high-stress environments.
**7907.00 – Zinc-based damper**
- **Defining trait:** Composed mainly of zinc; often used in sacrificial or damping coatings.
- **Typical examples:** Zinc-coated vibration-damping washers, anti-vibration plates.
- **Best fit when:** The product is primarily made of zinc, possibly for corrosion resistance or damping via material properties.
**8409.91 – Spark-ignition engine damper**
- **Defining trait:** Designed specifically for spark-ignition (gasoline) internal combustion engines.
- **Typical examples:** Crankshaft dampers for gasoline engines.
- **Best fit when:** The damper is used exclusively in gasoline-powered engines.
**8409.99 – Other ICE damper**
- **Defining trait:** For non-spark-ignition internal combustion engines (e.g., diesel).
- **Typical examples:** Diesel engine torsional dampers.
- **Best fit when:** The product is for diesel or other non-gasoline engines.
**8443.99 – Printing machinery damper**
- **Defining trait:** Designed specifically for printing machines (e.g., offset presses).
- **Typical examples:** Dampers in roller systems or feed mechanisms.
- **Best fit when:** The product is used in a printing press environment.
**8483.50 – Pulley vibration damper**
- **Defining trait:** Specifically designed for pulleys, especially torsional dampers on crankshafts.
- **Typical examples:** Torsional dampers for diesel engine pulleys.
- **Best fit when:** The damper is attached to a rotating pulley or shaft.
**8483.90 – Transmission element damper**
- **Defining trait:** Part of transmission systems (e.g., clutch or gearbox components).
- **Typical examples:** Dampers in automatic transmissions, clutch hubs.
- **Best fit when:** The product is integrated into a vehicle’s transmission.
**8487.90 – Machinery part damper**
- **Defining trait:** General-purpose damper for industrial machinery (not engine-specific).
- **Typical examples:** Dampers in pumps, compressors, or conveyors.
- **Best fit when:** The product is used in general industrial equipment.
**8708.80 – Suspension system damper**
- **Defining trait:** Used specifically in vehicle suspension systems (e.g., shock absorbers).
- **Typical examples:** Shock absorber mounts, suspension bushings.
- **Best fit when:** The product is part of a car’s suspension system.
**8708.99 – Other motor vehicle damper**
- **Defining trait:** For use in motor vehicles but not covered by other categories (e.g., non-suspension, non-engine).
- **Typical examples:** Dampers for seat mounts, trunk liners, or body panels.
- **Best fit when:** The product is used in a vehicle but doesn’t fall under engine, transmission, or suspension.
## Key differences
| HS Code | Material | Primary Use | Engine Type | System/Component |
|--------|----------|-------------|-------------|------------------|
| 3917.29 | Silicone plastic | Car replacement part | — | — |
| 3926.90 | TPE + plastic | General flexible use | — | — |
| 4008.11 | Cellular rubber | Shock absorption | — | — |
| 4016.99 | Vulcanised rubber | Heavy-duty mechanical | — | — |
| 5911.90 | Technical textile | Audio/vehicle interior | — | — |
| 7326.90 | Iron/steel | Structural support | — | — |
| 7907.00 | Zinc | Corrosion-resistant damping | — | — |
| 8409.91 | — | Spark-ignition engines | Gasoline | Engine |
| 8409.99 | — | Other ICEs | Diesel, etc. | Engine |
| 8443.99 | — | Printing machinery | — | Machine-specific |
| 8483.50 | — | Pulley/torsional dampers | — | Rotating shafts |
| 8483.90 | — | Transmission elements | — | Transmission |
| 8487.90 | — | General machinery parts | — | Industrial machinery |
| 8708.80 | — | Suspension systems | — | Vehicle suspension |
| 8708.99 | — | Other vehicle use | — | Vehicle (general) |
## How to choose
1. Is the damper made of rubber or plastic? → Go to 39xx–40xx.
2. Is it used in a motor vehicle’s suspension system? → HS Code 8708.80.
3. Is it part of an engine, transmission, or pulley system? → Check 8409.xx, 8483.50, 8483.90.
4. Is it for a printing machine or industrial equipment? → HS Code 8443.99 or 8487.90.
5. Does it use technical textiles (fabric)? → HS Code 5911.90.
6. Is it made of iron, steel, or zinc? → HS Code 7326.90 or 7907.00.
## Overlaps & pitfalls
- A damper for a diesel engine pulley (8483.50) may also be used in a vehicle (8708.99), but **8483.50 takes priority** if it’s a torsional pulley damper.
- A vibration damper made of rubber could fit both 4008.11 and 4016.99—choose based on whether it’s cellular (4008.11) or vulcanised (4016.99).
- If the product is used in a vehicle but not in suspension, engine, or transmission, use 8708.99.
- **No priority rule is specified**—choose based on the product’s MAIN function or primary application