ELASTOSIL® P 7600 A/B and MinghuiLink RTV-4030 are both very soft addition-cure silicones for flexible molding. P 7600 is softer at approximately Shore OO 26 with 600% elongation, while RTV-4030 is Shore OO 30 with lower published viscosity, slightly longer working time and substantially higher tear strength.
Addition-Cure Silicone
Life Casting Silicone
ELASTOSIL® P 7600 A/B and RTV-4030 are both very soft silicones, but they suit different priorities. P 7600 is better aligned with maximum softness, stretch and orthotics or skin-contact molding, while RTV-4030 offers lower published viscosity, slightly longer working time and substantially higher tear strength for lifecasting and flexible reproduction.
ELASTOSIL® P 7600 A/B and RTV-4030 are both very soft addition-cure silicones, with published hardness of approximately Shore OO 26 and Shore OO 30 respectively. P 7600 is softer, while RTV-4030 provides slightly more body.
Both use a 1:1 mixing ratio. P 7600 provides approximately 27 minutes of pot life at 23°C, while RTV-4030 provides about 30–40 minutes. RTV-4030 also publishes lower component viscosities, which can simplify manual mixing and pouring.
The main mechanical difference is tear strength. P 7600 publishes 1.5 N/mm tear strength and 600% elongation, while RTV-4030 publishes 6±0.5 N/mm tear strength and 560±50% elongation. P 7600 therefore favors softness and maximum stretch, while RTV-4030 provides substantially greater tear resistance.
Application positioning also differs. WACKER positions P 7600 for orthotics, prosthetics, skin-contact applications and flexible molding, while RTV-4030 is positioned for lifecasting, prosthetics, special effects and other soft reproduction work. The choice is therefore mainly between maximum softness and stretch versus greater tear resistance and easier processing.
Both materials are intended for flexible mold applications, but direct skin-contact use should always follow the applicable manufacturer instructions and safety requirements. For either product, compatibility with the intended master and casting material should be confirmed before production.
| Technical Parameter | WACKER ELASTOSIL® P 7600 A/B | MinghuiLink RTV-4030 |
|---|---|---|
| Silicone Type | Addition-cure RTV-2 | Platinum-cure silicone |
| Mix Ratio | 1:1 by weight | 1:1 by weight or volume |
| Shore Hardness | Approx. Shore OO 26 | Shore OO 30 |
| Viscosity | 4,000 mPa·s (Part A) | 2,500±200 mPa·s (Part A) |
| Working / Pot Life | 27 min @ 23°C | 30–40 min |
| Demold / Cure Time | Rapid room-temperature cure; conditions depend on part size and thickness | 4–5 h cure |
| Tensile Strength | 1 MPa | 1.2±0.5 MPa |
| Tear Strength | 1.5 N/mm | 6±0.5 N/mm |
| Elongation | 600% | 560±50% |
| Shrinkage | Not publicly listed | ≤0.2% |
| Typical Applications | Orthotics, prosthetics, skin-contact applications and flexible molding | Lifecasting, prosthetics, special effects and flexible reproductions |
| Technical Data Sources | ELASTOSIL® P 7600 A/B | RTV-4030 |
| Key Factor | WACKER ELASTOSIL® P 7600 A/B | MinghuiLink RTV-4030 | What It Means |
|---|---|---|---|
| Hardness | Approx. Shore OO 26 | Shore OO 30 | P 7600 is softer, while RTV-4030 provides slightly more body. |
| Mix Ratio | 1:1 | 1:1 | Both are simple to proportion for manual mixing. |
| Working Time | 27 min @ 23°C | 30–40 min | RTV-4030 provides a slightly longer published working window. |
| Component Viscosity | 4,000 / 2,000 mPa·s | 2,500 / 2,000 mPa·s | RTV-4030 publishes lower and more balanced component viscosities. |
| Tear Strength | 1.5 N/mm | 6±0.5 N/mm | RTV-4030 provides substantially higher published tear resistance. |
| Elongation | 600% | 560±50% | P 7600 provides slightly greater maximum stretch capability. |
| Application Positioning | Orthotics, prosthetics, skin-contact flexible molding | Lifecasting, prosthetics, special effects and flexible reproduction | P 7600 has stronger orthotics positioning, while RTV-4030 has broader lifecasting positioning. |
| Production Priority | Maximum softness and stretch | Higher tear resistance and easier processing | The main choice is between softness/stretch and handling durability. |
| Application | ELASTOSIL® P 7600 A/B | RTV-4030 |
|---|---|---|
| Lifecasting | Suitable | Strong candidate |
| Prosthetics | Strong candidate | Strong candidate |
| Orthotics | Strong candidate | Suitable |
| Skin-Contact Flexible Molding | Strong candidate | Strong candidate |
| Special Effects | Suitable | Strong candidate |
| Fine-Detail Flexible Reproduction | Strong candidate | Strong candidate |
| Thin or Repeatedly Handled Parts | Suitable with design consideration | Strong candidate |
Tell us your application. We’ll recommend the right RTV-2 silicone and provide a sample for testing.
Competitor specifications are based on publicly available manufacturer documentation, with links to the original sources where available. Missing values are shown as “Not publicly listed” and are not estimated or inferred. Specifications may change, so always check the latest manufacturer documentation and conduct application-specific testing before production use. Product names and trademarks belong to their respective owners. This comparison is provided for technical and informational purposes only and is not endorsed by the brands mentioned.