## Common ground
All options refer to doors or window frames made from different construction materials.
## Options at a glance
**3925.20 – Plastic material**
- **Defining trait:** Made primarily from synthetic polymers like PVC or polyethylene.
- **Typical examples:** PVC window frames, plastic door casings.
- **Best fit when:** The frame is lightweight, weather-resistant, and non-metallic with a smooth, molded appearance.
**4418.1X,4418.2X – Wood**
- **Defining trait:** Made from natural wood or wood-based composites (e.g., plywood).
- **Typical examples:** Wooden window frames, timber door frames.
- **Best fit when:** The frame has visible grain, is solid wood, or uses traditional joinery.
**6802.2X,6802.9X – Monumental or building stone**
- **Defining trait:** Constructed from natural stone like granite or marble.
- **Typical examples:** Stone-framed windows in historic buildings, monumental doorways.
- **Best fit when:** The frame is heavy, solid stone with minimal joints and high durability.
**6810.99 – Cement concrete or artificial stone**
- **Defining trait:** Made from cement-based materials, often precast or molded.
- **Typical examples:** Concrete window frames in industrial buildings, faux-stone frames.
- **Best fit when:** The frame is rigid, heavy, and resembles stone but is not natural.
**6811.89 – Asbestos cement or cellulose fiber cement**
- **Defining trait:** Made from cement mixed with fibrous materials (e.g., asbestos or cellulose).
- **Typical examples:** Older industrial window frames, corrugated sheeting used in framing.
- **Best fit when:** The material is brittle, fibrous, and commonly found in older or utility buildings.
**7308.30 – Iron or steel**
- **Defining trait:** Made from ferrous metals, often with a painted or galvanized finish.
- **Typical examples:** Steel window frames, iron door frames.
- **Best fit when:** The frame is strong, metallic, and used in industrial or security applications.
**7508 – Nickel**
- **Defining trait:** Made from nickel or nickel alloys (rare for framing).
- **Typical examples:** High-end architectural fittings, specialty doors in corrosive environments.
- **Best fit when:** The frame is highly corrosion-resistant and used in extreme conditions.
**7610.10 – Aluminium**
- **Defining trait:** Made from lightweight, corrosion-resistant aluminum alloys.
- **Typical examples:** Modern window systems, sliding door frames.
- **Best fit when:** The frame is sleek, lightweight, and commonly used in contemporary buildings.
**7907.00 – Zinc**
- **Defining trait:** Made from zinc or zinc alloys, often used for decorative or weather-resistant finishes.
- **Typical examples:** Zinc-clad window frames, historic door details.
- **Best fit when:** The frame has a distinctive metallic sheen and is used in high-end or heritage architecture.
## Key differences
| Material | Weight | Durability | Common Use | Appearance |
|--------|--------|------------|------------|------------|
| Plastic | Light | Moderate | Residential | Smooth, uniform |
| Wood | Medium | Moderate | Traditional | Natural grain |
| Stone | Heavy | High | Historic | Solid, textured |
| Concrete | Heavy | Very high | Industrial | Rigid, molded |
| Asbestos cement | Medium | Moderate | Older buildings | Brittle, fibrous |
| Iron/Steel | Heavy | Very high | Security | Metallic, rugged |
| Nickel | Medium | Very high | Specialized | Shiny, corrosion-resistant |
| Aluminium | Light | High | Modern | Sleek, lightweight |
| Zinc | Medium | High | Decorative | Durable, matte/silvery |
## How to choose
- Is the frame made of plastic (e.g., PVC)? → 3925.20
- Is it solid wood or has visible grain? → 4418.1X,4418.2X
- Is it heavy and made of natural stone? → 6802.2X,6802.9X
- Is it concrete or artificial stone? → 6810.99
- Does it contain asbestos or cellulose fiber? → 6811.89
- Is it metallic and strong (e.g., steel)? → 7308.30
- Is it shiny, corrosion-resistant, and rare? → 7508
- Is it lightweight, sleek, and modern? → 7610.10
- Does it have a silvery, durable finish? → 7907.00
## Overlaps & pitfalls
- Plastic and aluminum frames may look similar; prioritize material composition (plastic vs. metal).
- Cement concrete and artificial stone are often confused; check if it’s natural or man-made.
- Asbestos cement is outdated and hazardous—verify material type carefully.
- Nickel and zinc frames are rare; confirm actual material, not just finish.
- No clear priority: choose based on the **main structural material**, not surface coating