---
title: Silicone Molds Materials Guide | Ineo
description: Discover elastomers and silicones for casting mold manufacturing. Shore hardness, elongation, and technical flexibility.
date: 2020-03-31
url: https://ineo.es/en/technologies/engineering-hub/material-guide/silicone-molds
---

# Materials for Manufacturing Silicone Molds for Casting Parts

## The correct selection of molding elastomers and silicones is essential to ensure fidelity in part reproduction through casting. Our materials table compiles technical data regarding Shore hardness, tear resistance, and flexibility of our silicone systems, optimizing the duplication process for demanding geometries.

### Silicone Molds - Materials Comparison Table

💡 Click on any header to sort the table content.

| Brand/Manufacturer | Description | Density [g/cc] | Flexibility (Flexural Modulus [MPa]) | Flexural Strength [MPa] | Tensile Modulus [MPa] | Tensile Strength [MPa] | Elongation at Break | Impact Strength [kJ/m²] | Heat Deflection Temp (1.82 MPa) [°C] | Glass Transition Temperature [°C] | Hardness at 23°C (Shore A or D) | Special Characteristic |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| BLUESTAR ELKEM (RHODIA, RHONE-POULENC) | ESSIL 291 | - | - |  | - | 5 | 350% | - |  |  | 38 A | Addition RTV silicone |
| SHIN ETSU | SEN 245 | 1,09 | - | - | - | 6 | 310-350% | - | - | - | 36-39 A | Addition RTV silicone |
| WACKER | Elastosil VARIO FDA | 1,15 | - |  |  | 8 | 450% | - | - | - | 40A | Addition RTV FDA silicone |
| DOW CORNING | RTV-4234 T4 DOW With oil | 1,10 | - | - | - | 6,50 | 375% | - | - | - | 40 A | Addition RTV silicone |
| DOW CORNING | RTV-4234 T4 DOW Without oil | 1,10 | - | - | - | 6,50 | 375% | - | - | - | 40 A | Addition RTV silicone |
| SHIN ETSU | X-H32-201 | 1,08 | - | - | - | 4,70 | 350% | - | - | - | 36 A | Addition RTV silicone |

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### Do you have doubts about mold durability or the reproduction of complex details?

We help you define the ideal Shore hardness and compatibility with your master model to optimize short-run duplication without distortions.

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