Tan δ and Damping Values for Different Rubber Types

Main Properties Table

Rubber Type Shore A Hardness tan δ (at 10-100 Hz) Damping Coefficient ζ Sources
Natural Rubber (NR) 40-80 0.05-0.15 0.025-0.075 ResearchGate - NR/NBR Damping, MDPI - NR/SBR Blends
Styrene-Butadiene Rubber (SBR) 50-80 0.10-0.25 0.05-0.125 MDPI - NR/SBR Blends, ResearchGate - SBR/BR Blends
Butadiene Rubber (BR) 40-70 0.03-0.10 0.015-0.05 ResearchGate - SBR/BR Properties
Nitrile Rubber (NBR) 50-90 0.10-0.30 0.05-0.15 ResearchGate - NBR Damping, PMC - High-Damping Rubber Review
Chloroprene Rubber (CR, Neoprene) 40-80 0.08-0.20 0.04-0.10 PMC - High-Damping Rubber Review
EPDM (Ethylene-Propylene) 50-80 0.05-0.15 0.025-0.075 Julong Rubber - Damping Materials
Silicone Rubber (VMQ) 30-80 0.10-0.30 0.05-0.15 Generally accepted ranges
Polyurethane (PU) 60-95 0.05-0.20 0.025-0.10 Julong Rubber - Damping Materials
Fluorocarbon Rubber (FKM, Viton) 60-90 0.15-0.35 0.075-0.175 Generally accepted ranges
Butyl Rubber (IIR) 40-70 0.20-0.50 0.10-0.25 PMC - CIIR/Diatomite Composites, Inpart - Butyl Rubber Properties
Chlorobutyl Rubber (CIIR) 45-75 0.25-0.92 0.125-0.46 PMC - CIIR Damping Composites

Practical Recommendations from Literature

Key Findings

Frequency Dependence

Relationship between tan δ and Damping Coefficient

For Simplified Single-Term Prony Series in FEA:

For medium damping (NBR, SBR):

For high damping (IIR, vibration isolation):