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  • Two-part, translucent silicone system designed for use with injection molding equipment
  • Cures with heat via addition-cure chemistry
  • 1:1 Mix Ratio (Part A: Part B)


  • For the injection molding of parts requiring a material with a very low durometer including: molded rubber stoppers, gaskets, seals, valves, o-rings
  • and other precision parts
  • Suitable for over-molding applications
  • Can be used with NuSil’s Healthcare color masterbatches for applications requiring colored silicones
NuSil Technology's MED-4901 shall not be considered for use in human implantation for a period of greater than 29 days.

Product Details

Property Average Result
Durometer 40 Type 00
Tensile 285 psi (1.97 MPa)
Elongation 1135 %
Tear 55 ppi (9.7 kN/m)
Appearance Translucent
Cure 5 minutes / 150 °C
Cure Rate Scorch 0.9 minutes
Cure Rate T90 1.2 minutes
Cure System Platinum
Extrusion Rate 160 g/minute
Mix Ratio 1:1
Specific Gravity 1.1
Stress at Strain 15 psi / 300 % (0.1 Mpa / 300 %)
Work Time 25 hours
Comment Injection Molding Elastomer

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.