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  • Uncatalyzed, vinyl-functional, high consistency silicone elastomer
  • Requires the addition of a peroxide catalyst to accomplish vulcanization
  • Low tack surface
  • Strained through a 400-mesh screen (minimum)


  • For a wide variety of fabrication techniques for the healthcare industry including: molding, calendering and extruding of parts
  • Ideal for applications requiring a material with a low durometer, including: gaskets, seals, molded balloons, and catheter tips
NuSil Technology’s MED-4128 shall not be considered for use in human implantation for a period of greater than 29 days.

Product Details

Property Average Result
Durometer 25 Type A
Tensile 1,010 psi (6.97 MPa)
Elongation 800 %
Tear 70 ppi (12.35 kN/m)
Appearance Translucent
Cure 10 minutes / 116 °C
Cure Rate Scorch 0.55 minutes
Cure Rate T90 1.65 minutes
Cure System Peroxide
Mix Ratio 1 PART
Post Cure 2 hours / 200 °C
Specific Gravity 1.11
Stress at Strain 90 psi / 200 % (0.62 MPa / 200 %)
Comment Low Tension Set, Uncatalyzed

The Strongest Silicone Elastomer Ever Developed

Dr. Jim Lambert, NuSil® Director of Research and Development, Biomaterials, introduces our breakthrough material that has a tensile strength of up to 50% greater than existing silicone elastomers on the market.

Read more

The test data shown for this material is the average value for typical properties. All of these properties may not be tested on a lot to lot basis and cannot be used to draft specifications. Please contact NuSil for assistance and recommendations in establishing limits for product specifications.