ELASTOSIL® M 4630 A/B and MinghuiLink RTV-4130 are both addition-cure silicone systems for medium-soft reusable molds, with 28 Shore A and 30±1 Shore A hardness respectively. M 4630 A/B emphasizes high mechanical strength, 700% elongation, a 90-minute working time and applications such as concrete reproduction and deep undercuts. RTV-4130 focuses on simpler 1:1 mixing, lower published component viscosity, faster routine curing and a 250°C heat-resistance specification.
Addition-Cure Silicone
Platinum-Cure Silicone
ELASTOSIL® M 4630 A/B and RTV-4130 are close in hardness but serve different production priorities. M 4630 A/B is better suited to demanding reproduction, deep undercuts and large molds where high mechanical performance and a long working window are important. RTV-4130 is better aligned with routine production where simple 1:1 mixing, lower published viscosity and faster turnaround are priorities.
ELASTOSIL® M 4630 A/B and RTV-4130 are both addition-cure silicone systems for reusable molds in a similar medium-soft range. WACKER lists M 4630 A/B at 28 Shore A, while MinghuiLink lists RTV-4130 at 30±1 Shore A. The difference is relatively small, so processing characteristics, mechanical performance and application requirements are more important than hardness alone.
The biggest processing differences are mixing ratio, working time and viscosity. M 4630 A/B uses a 10:1 system, with approximately 15,000 mPa·s Part A, 800 mPa·s Part B and 10,000 mPa·s mixed viscosity. RTV-4130 uses a simpler 1:1 system with lower published component viscosities of approximately 4,400±200 mPa·s for Part A and 3,900±200 mPa·s for Part B. M 4630 A/B, however, provides a much longer 90-minute working time versus approximately 35 minutes for RTV-4130, giving more processing margin for large or complex molds.
Cure speed favors RTV-4130 for routine production. WACKER reports approximately 12 hours to a tack-free state for M 4630 A/B, while MinghuiLink lists approximately 5 hours for RTV-4130. These are different published endpoints and should not be treated as directly equivalent, but RTV-4130 is better aligned with shorter routine mold-production cycles.
Mechanical performance strongly favors M 4630 A/B on the published data. It lists 6.5 MPa tensile strength, >30 N/mm tear strength and 700% elongation, compared with 5.0±0.5 MPa, 28±0.5 N/mm and 400±50% respectively for RTV-4130. The higher elongation and tear-strength profile is particularly relevant to demanding molds, repeated demolding and deep undercuts.
Application positioning also differs. WACKER specifically positions M 4630 A/B for concrete reproduction, deep or extensive undercuts and demanding reproduction molds, with strong resistance to common casting resins. RTV-4130 is positioned more broadly for general reusable molds and casting applications, where simple 1:1 processing, lower component viscosity and faster turnaround can be more important. M 4630 A/B is also stated by WACKER to comply with FDA/BfR requirements for applicable food-contact uses.
Overall, M 4630 A/B is the stronger choice when long working time, high mechanical performance, difficult demolding and demanding reproduction are priorities. RTV-4130 is better suited to routine production where simple proportioning, lower published viscosity and faster published curing are more important. For large concrete or heavily loaded molds, either material may require a mother mold or external support depending on mold geometry and casting weight.
| Technical Parameter | WACKER ELASTOSIL® M 4630 A/B | MinghuiLink RTV-4130 |
|---|---|---|
| Silicone Type | Addition-cure RTV-2 | Platinum-cure silicone |
| Color | White | Translucent |
| Specific Gravity | 1.13 g/cm³ | 1.07–1.09 g/cm³ |
| Mix Ratio | 10:1 by weight | 1:1 by weight or volume |
| Shore Hardness | 28 Shore A | 30±1 Shore A |
| Viscosity | 15,000 mPa·s (Part A) | 4,400±200 mPa·s* (Part A) |
| Mixed Viscosity | 10,000 mPa·s | Not publicly listed |
| Working / Pot Life | 90 min | 35 min |
| Demold / Cure Time | 12 h tack-free | 5 h cure |
| Tensile Strength | 6.5 MPa | 5.0±0.5 MPa |
| Tear Strength | >30 N/mm | 28±0.5 N/mm |
| Elongation | 700% | 400±50% |
| Shrinkage | <0.1% | ≤0.1% |
| Temperature Resistance | Not publicly listed as an equivalent continuous-use rating | Up to 250°C / 482°F |
| Concrete / Casting Resistance | Specifically positioned for concrete casting and reproduction | Suitable for casting applications with process validation |
| Regulatory Positioning | WACKER states FDA/BfR food-contact compliance | Not publicly listed for RTV-4130 |
| Typical Applications | Concrete reproduction, construction molding, deep undercuts and demanding reproduction molds | Reusable molds, resin casting and general A30-class mold making |
| Technical Data Sources | ELASTOSIL® M 4630 A/B | RTV-4130 |
| Key Factor | WACKER ELASTOSIL® M 4630 A/B | MinghuiLink RTV-4130 | What It Means |
|---|---|---|---|
| Hardness | 28 Shore A | 30±1 Shore A | M 4630 A/B is slightly softer, while RTV-4130 provides slightly more cured body. |
| Mixing System | 10:1 | 1:1 | RTV-4130 is considerably simpler for manual batching. |
| Working Window | 90 min | 35 min | M 4630 A/B provides substantially more processing time for large or complex molds. |
| Component Viscosity | 15,000 / 800 mPa·s | 4,400 / 3,900 mPa·s | RTV-4130 publishes lower component viscosities, while M 4630 A/B is evaluated with its 10:1 mix system. |
| Tensile Strength | 6.5 MPa | 5.0±0.5 MPa | M 4630 A/B publishes the higher tensile-strength value. |
| Tear Strength | >30 N/mm | 28±0.5 N/mm | M 4630 A/B publishes the higher stated tear-strength threshold. |
| Elongation | 700% | 400±50% | M 4630 A/B provides substantially greater published stretch capability. |
| Undercut Positioning | Explicitly positioned for deep undercuts | Suitable for flexible undercuts | M 4630 A/B has the stronger manufacturer positioning for demanding undercut reproduction. |
| Concrete Molding | Explicit main application | Suitable with validation | M 4630 A/B is more specifically positioned for concrete reproduction. |
| Mold Turnaround | 12 h tack-free | 5 h cure | RTV-4130 is better aligned with faster routine turnaround based on the published endpoints. |
| Food-Contact Positioning | FDA/BfR compliance stated by WACKER | Not publicly listed | M 4630 A/B has an additional regulatory positioning for applicable food-contact uses. |
| Heat Resistance | Not publicly listed as equivalent numerical rating | 250°C / 482°F | RTV-4130 provides the clearer numerical heat-resistance specification. |
| Application | ELASTOSIL® M 4630 A/B | RTV-4130 | Key Consideration |
|---|---|---|---|
| Concrete Casting Molds | Strong candidate | Suitable with testing | WACKER specifically positions M 4630 A/B for concrete casting and reproduction. |
| Deep / Extensive Undercuts | Strong candidate | Strong candidate | M 4630 A/B combines a slightly softer hardness with 700% elongation and explicit deep-undercut positioning. |
| Complex Reproduction Molds | Strong candidate | Strong candidate | M 4630 A/B offers higher published mechanical properties and a longer working window, while RTV-4130 offers simpler processing. |
| Large Manual Molds | Strong candidate | Suitable | M 4630 A/B provides a 90-minute working window, giving substantially more time for preparation and pouring. |
| Thin Mold Edges | Strong candidate | Strong candidate | Both publish strong tear-strength values, with M 4630 A/B specified at >30 N/mm. |
| General Resin Casting | Strong candidate | Strong candidate | Both can be evaluated for reusable resin molds; actual compatibility depends on the casting chemistry. |
| Rapid Routine Production | Suitable | Strong candidate | RTV-4130 combines simpler 1:1 mixing with a shorter published cure time. |
| Food-Contact Applications | Strong candidate with regulatory verification | Not publicly listed | WACKER states FDA/BfR compliance for M 4630 A/B; target-market requirements should still be confirmed. |
| High-Temperature Casting | Suitable with temperature validation | Strong candidate | RTV-4130 publishes a numerical heat-resistance specification of 250°C / 482°F. |
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.