Bridge bearings / PTFE elastomeric bearings
1. Structure
PTFE 1 – pure PTFE without any additions,
PTFE M1 – modified PTFE (2nd generation PTFE)
fillers: glass, graphite, carbon, bronze, molybdenum sulphide, aluminum
oxide, pigments and polymers
2. Characteristics
PTFE 1
⦁ resistant to virtually all organic and inorganic chemicals
⦁ temperature resistant from -269°C tp +260°C
⦁ excellent electrical insulation properties,
⦁ low coefficient of friction,
⦁ no stick-slip effect,
⦁ marked anti-adhesive behavior,
⦁ physiologically harmless (FDA and BfR conformity),
⦁ outstanding weather resistance,
⦁ no aging,
⦁ no water absorption,
⦁ low thermo-conductivity,
⦁ extremely low flammability (UL 94 at 1,5mm: VO, LOI index: 95%)
⦁ relatively low wear resistance,
PTFE M1:
⦁ lower deformation under load stress,
⦁ lower tendency to cold flow,
⦁ tighter structure with fewer voids,
⦁ improved compression stress relaxation (recovery),
⦁ improved welding qualities,
⦁ smoother surfaces on machined parts.
3. The influence of fillers on the characteristics compared to pure PTFE
4. Applications