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When choosing silicone rubber for mold making, tear strength is one of the most important properties to consider. It affects how well a silicone mold withstands tearing, especially when removing castings with undercuts, thin edges, or complex details.

When choosing silicone rubber for mold making, tear strength is one of the most important properties to consider. It affects how well a silicone mold withstands tearing, especially when removing castings with undercuts, thin edges, or complex details.

But what exactly is tear strength, and how can you choose the right silicone for your mold-making project?

In this guide, we explain tear strength in mold-making silicone, why it matters, and how it influences mold performance and service life.

Need Help Choosing Silicone for Your Large Mold?

The right silicone depends on your mold size, geometry, master pattern, casting material, and production process.

SIMOST Silicone supplies RTV-2 silicone systems with different hardness, viscosity, cure speeds, and performance characteristics for professional mold-making applications.

Contact us with your mold size, application, required hardness, and casting material, and we can recommend a suitable silicone grade.

Contact our technical team with your application details.

Choose Available Hardness, Viscosity and Cure Options for Your Mold Making.

For medical training models, platinum medical silicone is recommended. Shore 00-05 to 00-20 mimics soft skin & fat for suture practice. Shore A 5–15 works for tougher tissue and high-cycle repeated training.

Medical‑grade platinum cure silicone is best for human skin simulation. Shore 00‑10 ~ 00‑30 delivers flesh-like softness and stretch, while Shore A 5‑15 offers higher tear strength for repeated use. It can be tinted for realistic skin tones and fine texture reproduction.

Food‑grade platinum‑cure silicone can produce fine chocolate patterns with excellent detail reproduction. Shore A 20‑30 translucent grade is widely used for chocolate moulds. Please avoid tin‑cure silicone for food‑contact applications.

Select the right Shore A hardness for craft mold silicone. Shore A 10‑15 for detailed undercuts, 20‑25 for general crafts, Shore A 30 for large concrete casting molds.

Tin‑cure mold silicone stands out for its sulfur compatibility with zero cure‑inhibition risk, affordable cost, great flexibility and sharp detail replication. It is a practical choice for concrete, resin and general craft mold production.