Simple Guide: Evaluating Modification Materials for Auto Interior PP Color Film

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To check if a modification material (like talc, glass fiber, or elastomers) works for auto interior PP color film, focus on 5 easy-to-understand areas. These match what car interiors actually need—comfort, durability, and affordability.​

1. Check How It Feels (Tactile Comfort)​

Car interior parts (like armrests or door handles) need to feel good. Test if the modified film is soft or smooth enough:​

• Touch it: Ask people to rate how it feels (1 = rough/stiff, 5 = soft/smooth). Elastomer-modified film should score 4–5 (like soft rubber), while too much glass fiber may feel stiff (score 2–3).​

• Use a hardness tool: For soft parts (e.g., grips), the hardness should be 50–70 Shore A. For stiff parts (e.g., dash trims), 80–90 Shore A is okay.​

• Example: Talc-modified film (75 Shore A) feels softer than glass fiber (85 Shore A).​

2. See If It Lasts (Mechanical Durability)​

The film needs to handle daily use (like rubbing or small bumps):​

• Stretch test: Pull the film until it breaks. Glass fiber-modified film (needs more force to break) is stronger than pure PP—good for often-used parts (e.g., center consoles).​

• Impact test: Drop a 500g weight from 30cm onto the film. Elastomer-modified film rarely cracks, but calcium carbonate ones might if hit hard.​

• Scratch test: Rub the film with cotton 1,000 times. Talc-modified film wears less than pure PP.​

3. Test If It Handles Car Conditions (Environmental Stability)​

Cars get hot (summer) and cold (winter), and sunlight fades things. Check:​

• Heat test: Put the film in an 80°C oven for 24h. Talc or glass fiber films won’t warp as much as pure PP.​

• Cold test: Freeze it at -20°C for 24h, then bend it. PE-blended film stays flexible; pure PP might crack.​

• UV test: Shine a UV lamp on it for 100h. Elastomer films fade less than others.​

4. Check If It’s Easy to Make (Processing Adaptability)​

Even good film is useless if it’s hard to produce:​

• Flow test: Measure how easily melted film flows (at 230°C). Calcium carbonate films flow better (15g/10min) than glass fiber ones (10g/10min)—easier to make in large quantities.​

• Look at the surface: Use a magnifying glass. Talc films are smooth; too much glass fiber causes small bumps.​

5. Compare Cost vs. Benefit (Cost-Effectiveness)​

Car makers care about cost. See if the material’s benefits are worth the extra money:​

• Example: Talc adds ​0.1/kgbutmakesthefilm5MPastronger(goodvalue).Glassfiberadds0.5/kg for 10MPa stronger—only worth it for parts that need extra strength.​

Key Tip: Match the Material to the Part​

• Soft, cheap parts (e.g., glove boxes): Choose talc or calcium carbonate.​

• Strong parts (e.g., center consoles): Use glass fiber.​

• Often-touched parts (e.g., armrests): Pick elastomers.​

These simple checks help you pick the right material for any auto interior PP color film.​