Shin-Etsu Silicone Rubber for Molding Selection Guide

Vibration Control HCR | Vibration Control Silicone Rubber (High Decrement)

  • Excellent vibration-proofing properties over a wide temperature range.
  • High loss factor, high decrement type.
  • Hardness range from 30 to 70 (Durometer A)

Product Information

Key Points

Use For molding
Molding method Press molding, peroxide curing
Features Vibration proofing (high decrement), fatigue durability
Industry Automobiles, transport, railways, general industry

Application

FF joint boots such as muffler hangers for automobiles, engine mounts, suspension bushes, etc., and other parts that absorb and block the vibration of engines transmitted to the car body.

Expected Results

High loss modulus tan δ ⇒Can be used over a wide temperature range, which is difficult with organic rubbers.

Parameter\Product name  KE-5530-U   KE-5540-U   KE-5550-U   KE-5560-U   KE-5570-U 
Appearance Pale yellow Pale yellow Pale yellow Gray Gray
Williams plasticity (10 min after remix) 255 296 365 409 418
Standard adding quantity phr Curing agent name C-8/2.0 C-8/2.0 C-8/2.0 C-8/2.0 C-8/2.0
Test piece
standard curing conditions
Primary cure
Post cure
165℃×10m
200℃×4h
165℃×10m
200℃×4h
165℃×10m
200℃×4h
165℃×10m
200℃×4h
165℃×10m
200℃×4h
Hardness (Durometer A) 35 42 52 63 72
Density at 23℃ (g/cm3) 1.17 1.23 1.26 1.45 1.42
Tensile strength (MPa) 8.8 9.6 9.2 6.4 5.5
Elongation at break (%) 870 800 750 510 330
Tear strength Crescent piece (kN/m) 20 34 38 26 18
Modulus of resilience (%) 32 26 23 23 22
Compression set 180℃×22h (%) 10 13 14 18 30

(Not specified values)

Data of Vibration Proofing

Viscoelasticity
(Temperature: roomtemperature/frequency: 30Hz/Displacement: 400μm)
KE-55X0-U
(Low dynamic magnification)
Reference:KE-551-U
(Conventional product)
Elastic modulus E’ (MPa) 5.67 5.10
Loss modulus tanδ 0.39 0.11
Dynamic magnification E’ at 0.1Hz, 400μm (MPa) 4.07 4.48
E’ at 100Hz, 50μm (MPa) 11.41 6.36
Dynamic magnification:E’100/E’0.1 2.80 1.42

・Low temperature dependency from low to high temperatures.

Product Inquiry

Vibration Control HCR | Vibration Control Silicone Rubber (High Decrement)

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