Wacker CENUSIL® M 810 A/B vs RTV-4110 Silicone Comparison

1. Technical Assessment

CENUSIL® M 810 A/B and RTV-4110 are both Shore A10 addition-cure silicone systems for highly flexible reusable molds. With essentially the same cured hardness, the main selection factors are flexibility, tear resistance, processing characteristics and mold geometry. WACKER specifically positions M 810 A/B for accurate reproduction, low demolding force and models with pronounced undercuts, while RTV-4110 offers a stronger published mechanical profile.

The mechanical data show a clear trade-off. M 810 A/B publishes 3.5 MPa tensile strength, 15 N/mm tear strength and 600% elongation, compared with 4.0 MPa, 25 N/mm and 510% respectively for RTV-4110. M 810 therefore provides the higher published elongation and is attractive when maximum stretching and easy release are important, while RTV-4110 provides higher tensile and tear strength, which can be valuable for thin mold edges and repeated mechanical handling.

Processing characteristics are broadly similar. Both use a simple 1:1 mix ratio, while M 810 A/B provides a slightly longer 40-minute working time versus approximately 35 minutes for RTV-4110. WACKER also highlights excellent flowability and good self-deaeration for M 810 A/B. Published component viscosities are in a similar low-viscosity range, so neither product has a decisive overall viscosity advantage for routine pouring and mold filling.

The biggest application difference is demolding behavior. M 810 A/B is specifically positioned for low demolding force, pronounced undercuts and glove or one-part skin molds. Its 600% elongation and very soft A10 hardness make it particularly suitable when the mold must flex substantially around complex geometry. RTV-4110 is also suitable for flexible undercut molds, but its higher tear and tensile strength make it more attractive where mechanical durability is the greater concern.

Both materials can be used for detailed molds, resin casting and other reusable mold applications, but large A10 molds may require a mother mold or support shell because very soft silicone can deform under the casting load. Overall, CENUSIL® M 810 A/B is the more specialized choice for maximum flexibility, low demolding force and difficult undercuts, while RTV-4110 is better aligned with users seeking higher published tensile and tear strength and a robust general-purpose A10 mold silicone.

2. Technical Comparison

Technical Parameter	WACKER CENUSIL® M 810 A/B	MinghuiLink RTV-4110
Silicone Type	Addition-cure RTV-2	Platinum-cure silicone
Color	White	Translucent
Specific Gravity	Not publicly listed	1.03–1.05 g/cm³
Mix Ratio	1A:1B	1A:1B by weight or volume
Shore Hardness	10 Shore A	10 Shore A
Viscosity	3,000 mPa·s (Part A)	4,000 mPa·s* (Part A)
Working / Pot Life	40 min	35 min
Demold / Cure Time	4 h tack-free	5 h cure
Tensile Strength	3.5 MPa	4.0 MPa
Tear Strength	15 N/mm	25 N/mm
Elongation	600%	510%
Shrinkage	No chemical shrinkage	≤0.1%
Temperature Resistance	Not publicly listed	Up to 250°C / 482°F
Self-Deaeration	Good self-deaeration	Not specifically listed
Typical Applications	Flexible mold making, glove molds, one-part skin molds and masters with pronounced undercuts	Soft flexible molds, detailed casting molds and general mold-making applications
Technical Data Sources	CENUSIL® M 810 A/B	RTV-4110

Data Methodology: Competitor specifications are based on publicly available manufacturer technical information. Missing values are marked "Not publicly listed" and are not estimated. Viscosity values are reported according to the manufacturers' stated measurement points and should not be treated as a strict like-for-like comparison where test bases differ. WACKER reports a 4-hour tack-free cure, while MinghuiLink reports a 5-hour cure time; these endpoints should not be treated as identical test conditions. Specifications may change, so always check the latest manufacturer documentation and conduct application-specific testing before production use.

3. Key Differences

Key Factor	WACKER CENUSIL® M 810 A/B	MinghuiLink RTV-4110	What It Means
Hardness	10 Shore A	10 Shore A	Both are very soft A10 mold silicones, so hardness is not a key differentiator.
Elongation	600%	510%	M 810 A/B provides higher published stretch capability for difficult demolding.
Tear Strength	15 N/mm	25 N/mm	RTV-4110 provides substantially higher published resistance to tear propagation.
Tensile Strength	3.5 MPa	4.0 MPa	RTV-4110 publishes the higher tensile-strength value.
Working Window	40 min	35 min	M 810 A/B provides a slightly longer published working time.
Component Viscosity	3,000 / 3,000 mPa·s	4,000 / 2,800 mPa·s	Both are relatively low-viscosity systems; neither has a decisive overall viscosity advantage.
Curing	4 h tack-free	5 h cure	M 810 A/B reaches its published tack-free endpoint earlier, but the test endpoints are different.
Demolding Focus	Low demolding force; pronounced undercuts	General flexible mold making	M 810 A/B has the stronger published positioning for difficult flexible demolding.
Self-Deaeration	Good self-deaeration	Not specifically listed	M 810 A/B has a specific published advantage for air release during pouring.
Heat Resistance	Not publicly listed	250°C / 482°F	RTV-4110 provides the clearer numerical high-temperature specification.
Product Positioning	Maximum flexibility and difficult demolding	Higher tear/tensile strength and general A10 production	The main choice is between stretchability and mechanical robustness.

4. Application Comparison

Application	CENUSIL® M 810 A/B	RTV-4110	Key Consideration
Pronounced Undercuts	Strong candidate	Strong candidate	Both are highly flexible A10 materials, while M 810 A/B is specifically positioned for pronounced undercuts and low demolding force.
Flexible Demolding	Strong candidate	Strong candidate	M 810 A/B has higher published elongation; RTV-4110 has higher published tear strength for repeated flexing and handling.
Glove / One-Part Skin Molds	Strong candidate	Suitable	WACKER specifically identifies glove molds and one-part skin molds as applications for M 810 A/B.
Detailed / Fine-Feature Molds	Strong candidate	Strong candidate	Both are soft, pourable materials; M 810 A/B has specifically stated excellent reproduction accuracy and good self-deaeration.
Thin Mold Edges	Suitable	Strong candidate	RTV-4110's 25 N/mm published tear strength provides the stronger numerical profile for thin or repeatedly handled sections.
Large Soft Molds	Suitable with support	Suitable with support	Both A10 materials are very soft and may require a mother mold or support shell to limit deformation.
Resin Casting	Strong candidate	Strong candidate	Both can be used for reusable casting molds; compatibility should be confirmed with the intended resin.
Plaster / Decorative Casting	Strong candidate	Strong candidate	The very soft A10 profile supports flexible demolding of detailed decorative casts, subject to adequate mold support.
High-Temperature Casting	Suitable with temperature validation	Strong candidate	RTV-4110 publishes a numerical heat-resistance specification of 250°C; M 810 A/B requires application-specific temperature validation.
3D-Printed Masters	Suitable with compatibility testing	Suitable with compatibility testing	UV resin residues, coatings and other contaminants may inhibit addition-cure silicone. Test the actual master before production.

Source basis: Application suitability is based on the manufacturers' published application information and general material characteristics. Actual compatibility should be validated with the intended master, casting material, mold design and production process. Very soft A10 molds may require external support for large or heavy castings.

5. FAQ

1. Is RTV-4110 a direct replacement for CENUSIL® M 810 A/B?

RTV-4110 can be evaluated as an alternative for many Shore A10 mold-making applications because both products are soft addition-cure silicones with a 1:1 mixing system. However, M 810 A/B is specifically positioned for low demolding force and pronounced undercuts, while RTV-4110 publishes higher tensile and tear strength. Application-specific testing is recommended before switching.

2. Is CENUSIL® M 810 A/B better for molds with pronounced undercuts?

CENUSIL® M 810 A/B is particularly well suited to pronounced undercuts because WACKER specifically highlights low demolding forces, high elongation and accurate reproduction of models with pronounced undercuts. Its published elongation is 600%, compared with 510% for RTV-4110. Actual demolding performance still depends on mold thickness, geometry and the release path.

3. Which silicone has higher tear strength, CENUSIL® M 810 A/B or RTV-4110?

RTV-4110 has the higher published tear-strength value at 25 N/mm, compared with 15 N/mm for CENUSIL® M 810 A/B. This difference may be relevant for thin mold edges, repeated peeling and other applications where resistance to crack or tear propagation is important.

Compare Another Silicone

Disclaimer

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.

CENUSIL® M 810 A/B vs RTV-4110 Silicone Comparison

CENUSIL® M 810 A/B

RTV-4110

Conclusion