Butyl damping

一、Core principles and structure

• Molecular structure: The main chain of polyisobutene contains dense methyl groups, with high resistance to chain movement and internal friction. The loss factor tan δ is high (0.4-0.7), and the damping performance is excellent.
• Mechanism of action: When subjected to alternating vibration, molecular chains generate heat through friction, attenuate resonance, suppress noise, and belong to viscoelastic damping.
• Typical formula: Butyl rubber+tackifying resin+reinforcing filler (calcium carbonate, carbon black)+aluminum foil/release paper, environmentally friendly and asphalt free.

二、Key Performance (2026 Industry Standard)

• Temperature applicable: -50 ℃~+120 ℃, 30-60 ℃ (commonly used temperature range for automobiles) with the highest damping peak.
• Loss factor: tan δ ≥ 0.3 at 23 ℃/1Hz, with high-quality up to 0.65+.
• Density: 1.8-2.5g/cm ³, 30% lighter than asphalt, beneficial for lightweighting.
• Other: Excellent airtightness, ozone/aging resistance, waterproof and corrosion-resistant, self-adhesive and easy to apply.

三、Main applications

1. Automotive NVH (most mainstream)
   • Body: doors, floor, trunk, wheel arches, roof, to suppress sheet metal resonance and road noise.
   • Chassis/engine compartment: vibration isolation, noise reduction, heat insulation, and resistance to high temperatures and oil stains.
   • Alternative asphalt: low VOC, low odor, in line with environmental requirements.
2. industrial equipment
   • Mechanical and electrical/fan/pump body: shell and base are attached to reduce structural noise and vibration.
   • Pipeline/valve: vibration reduction and isolation, reducing fluid noise and resonance.
3. Architecture and Home Appliances
   • Architecture: partition walls, floor slabs, pipe shafts, sound insulation and vibration reduction.
   • Home appliances: washing machines, air conditioners, refrigerators, reduce vibration and noise during operation.

四、pros and cons

• ✅ Advantages: Strong damping, wide temperature range, aging resistance, self-adhesive and easy to stick, environmentally friendly, airtight and waterproof.
• ❌ Disadvantages: High density (heavier than EPDM), slightly reduced elasticity at low temperatures (<-30 ℃), and easy aging at high temperatures for a long time.

五、Selection and Construction Points

• Selection: 2-4mm for car floor/trunk; 1-2mm for door/roof; high-density/high filling type for industrial heavy vibration.
• Construction: Surface cleaning, drying, and degreasing; Tear off paper compaction, roller pressing exhaust; Low temperature (<15 ℃) requires heating to aid adhesion; Edge sealing to prevent warping.

六、Comparison with common damping materials