Structural material comparison guide
▎EPDM (ethylene propylene diene monomer)
Features: UV/ozone/climate triple protection
Application scenarios:
✔️ Car door and window seals (all-weather aging resistance)
✔️ Outdoor equipment seals (anti-rain and sun exposure)
✔️ Photovoltaic module frame seals (stable at -50℃~150℃)
▎Silicone
Features: -60℃~230℃ ultra-wide temperature range, flexible as before
Advanced applications:
🔥 Aircraft engine high temperature gaskets
❄️ Cold chain logistics vehicle seals
⚡ High-voltage insulation seals (dielectric strength 15kV/mm)
▎Neoprene
Chemical protection shield:
▶️ Resistant to engine oil/hydraulic oil/weak acid and alkali (PH3~11)
▶️ Industrial model:
✔️ Chemical plant reactor seals
✔️ Automobile gearbox gaskets
✔️ Offshore platform anti-corrosion seal
▎Nitrile rubber (NBR)
Guardian of fuel system:
▶️ Gasoline permeability resistance is 300% higher than natural rubber
▶️ Must-use scenarios:
⛽ Fuel pipe seal
🔧 Diesel engine cylinder gasket
⚙️ Hydraulic system O-ring
▎PVC (polyvinyl chloride)
Economical solution:
▶️ Door and window seal cost reduced by 40%
▶️ Upgraded version:
✔️ Plasticized (flexibility ↑30%)
✔️ Flame retardant (oxygen index ≥28)
✔️ Antistatic (surface resistance 10^8Ω)
Material selection decision matrix
| Working condition challenges | Preferred materials | Key indicators |
| Long-term outdoor exposure | EPDM sealing strips | UV resistance Class 8 |
| 150℃ high temperature environment | Silicon seals | Thermal weight loss rate <5% (230℃/72h) |
| Gasoline immersion | Nitrile rubber (NBR) | Volume expansion rate <15% |
| Acid and alkali corrosion | Chloroprene rubber/fluororubber | Acid and alkali concentration gradient table |
| Low-cost door and window seals | PVC modified material | Shore hardness 75A±5 |
Summary
Analyze sealing technology from the perspective of material science, master the weather resistance mechanism of EPDM molecular chain and the thermal stability principle of Si-O bond of silicone, so that material selection can be upgraded from empirical judgment to data-based decision-making, truly realizing “one material to seal the world”.
