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BLUESIL RTV 3428 A + B Kit white

BLUESIL RTV 3428 A + B Kit white

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BLUESIL® RTV 3428 A + B Kit white – Temperature-resistant 2K silicone for robust, detailed shapes

2K-Pt silicone with exceptionally high elongation at break (600%) and highest tear resistance (20 kN/m) for highly stressed molds

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  • Manufacturer
  • Mixing ratio
  • Networking type
  • Number of components
  • consistency
  • Mixing ratio
  • UV resistance
  • Paint has hardened
  • Self-leveling
  • Electrical insulation
  • Potting time (min)
  • Demolding time (min)
  • Food contact
  • Suitable for medical use
  • Shore hardness A (cured)
  • Container

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Weiss Mold Making Silicone BLUESIL 2K Silicone ELKEM Swiss Bearing Aerospace RTV Addition Platinum Complete Kit Ready to Mix Prototyping RTV 3428 Shore A 28 High Elongation High Tear Strength Composite Mold Boatbuilding Thermal Expansion Former Flexible Mold

 
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. Express logistics. Fast and reliable within Switzerland & Europe.

Shipping from Swiss warehouse within 24 hours. Batch certificate. Invoice within 30 days (B2B). Technical support.
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Usually 1 to 3 working days

Availability will be confirmed after order receipt.

Express logistics within Switzerland & Europe.

General Terms and Conditions →

Product data

HS code: 39100000000

HS code: 39100000000

BLUESIL RTV 3428 A + B Kit white
BLUESIL RTV 3428 A + B Kit white
Bluesil · Elkem Silicones ·

Bluesil RTV 3428 A & B is a 2K-Pt silicone with exceptionally high elongation at break (600%) and maximum tear resistance (20 kN/m) for highly stressed molds.

This product line comprises 2K polyaddition silicone elastomers (platinum-catalyzed) for mold making — without reaction byproducts, offering excellent detail reproduction and reusability. RTV 3428 is tailored to specific industrial applications — the most important properties and areas of application are listed below.

600% elongation at break — highest tear resistance

Bluesil RTV 3428 is among the most ductile and tear-resistant polyaddition silicones for mold making — 600% elongation at break and 20 kN/m tensile strength. Suitable for highly complex undercuts and molds subjected to long-term stress.

RTV 3428 in numbers
600 %
Elongation at break
20 kN/m
Tear resistance
Shore A 28
hardness
7.5 MPa
Tensile strength

What makes the RTV 3428 stand out

Highest tear resistance
20 kN/m — withstands extreme mechanical stress during the demolding of demanding geometries.
600% elongation at break
Allows demolding of very complex undercuts without tearing.
Multiple color options
B-component available in transparent, pink and white — selectable to suit the application.
High tensile strength (7.5 MPa)
Long-term stable shape even under repeated stress.
Low shrinkage (<0.1%)
Precise reproduction without dimensional deviation.
Hardness adjustable via dilution
Bluesil 47V50 allows for fine-tuning of the consistency.

What is the RTV 3428 used for?

Complex shapes with undercuts
High elongation allows for the demolding of complex geometries.
Long-life serial molds
High tear resistance for many impression cycles.
Clay models and sculptures
Reproduction of delicate originals with high fidelity.
Industrial prototype molds
Precision tools for engineering prototypes.
Figure reproduction (toys, art)
Multiple impressions of highly detailed originals.
Multi-layer mold construction
Can be combined with other Bluesil-RTVs in multi-layer constructions.
Data sheets & safety data sheet
Full TDS and SDS in DE, EN, FR — view or download directly.
To the documents →

processing

1
Stir A and B separately
Stir both components thoroughly before each processing step — avoid sedimentation.
2
Mix in the correct proportions
Dose by weight (see comparison table: 10:1 or 1:1). Homogenize thoroughly with a low-speed mixer.
3
Degas in a vacuum
30–50 mbar vacuum — material expands 3–4 times, bubbles escape, collapses after 5–10 min. Interrupt the vacuum several times for better degassing.
4
Pour slowly
Pour slowly from the lowest point of the mold – this prevents air entrapment. Avoid inhibitors when using polyaddition (sulfur rubber, Sn-RTV, amine epoxides, PVC).
5
Allow to harden
Demoldable at 23 °C after demolding time (see TDS). Heat accelerates demolding — at higher temperatures the dimensions may change.
6
demolding
Carefully remove from the mold, separating the mold halves if necessary. Clean the mold before recasting — release agents are usually not required.

Recommended accessories

Bluesil Inhibitor 3
Pot life extender for polyaddition silicone systems (Pt-Cure).
View product →
Bluesil Fluid 47 V 50
PDMS thinner / plasticizer for Bluesil RTV systems.
View product →
Bluesil ADD 11013
Thixotropy additive for Bluesil RTV 3428 (polyaddition) — vertical application.
View product →
Bluesil Primer 131
Universal adhesion promoter for stainless steel, aluminum, PMMA and many metals.
View product →

Important instructions

Mixing & Dosage
Stir A and B thoroughly before each use. Use precise dosage in the specified ratio (see table above) — ideally by weight. Incorrect dosage will result in incomplete cross-linking.
Degassing
Degas the mixture under a vacuum of 30–50 mbar. The material expands 3–4 times, then contracts back to its original size after 5–10 minutes. Interrupt the vacuum several times for better degassing.
Avoid inhibitors
Polyaddition silicones are inhibited by: sulfur-vulcanized rubber, tin-catalyzed RTV, amine epoxides, and PVC with tin salts. If in doubt, conduct a preliminary test.
Application advice
SILITECH will advise you on the optimal RTV variant for your application — substrate, hardness, pot life, mechanics. Contact us with your specific application details.

RTV 3428 compared to related RTV products

Networking system, mechanics, and processing times side by side — all values ​​from the official Elkem TDS. “— " = not specified in the datasheet.

RTV 3428
Current product		 RTV 3440 →RTV 3445 →RTV 3450 →
Networking system2K Polyaddition (Pt)2K Polyaddition (Pt)2K Polyaddition (Pt)2K Polyaddition (Pt)
Mixing ratio10 : 110 : 110 : 110 : 1
ColorTransparent / pink / whiteBeige / blue (B)Beige / blue (B)Beige / black / translucent
Shore A hardnessA 28A 40A 45A 50
Elongation at break600 %300 %300 %300 %
Tensile strength7.5 MPa4 MPa5 MPa5 MPa
Tear resistance20 kN/m9 N/mm15 kN/m8 N/mm
Potting time1 h90 min1 h90 min
demolding time16 h6 h6 h16 h
Mixed viscosity≈25,000 mPa·s15,000 mPa·s13,000 mPa·s15,000 mPa·s
Main applicationComplex shapes with undercutsPlaster reproductionIndustrial prototype toolsHigh-stress tool molds
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
Weiss Mold Making Silicone BLUESIL 2K Silicone ELKEM Swiss Bearing Aerospace RTV Addition Platinum Complete Kit Ready to Mix Prototyping RTV 3428 Shore A 28 High Elongation High Tear Strength Composite Mold Boatbuilding Thermal Expansion Former Flexible Mold

Technical data for BLUESIL RTV 3428 A + B Kit white

All 17 product information 8 Further properties 1 Physical properties 2 Electrical properties 1 Curing values ​​2 Product approvals 2 Mechanical properties 1
Product information
brand Bluesil
Manufacturer Elkem Silicones
Mixing ratio 1:1
Networking type Addition (Platinum)
Number of components 2K (two-component)
consistency Flowable
Mixing ratio 10:1
Container 1.1 kg, 5.5 kg, 22 kg
Other features
UV resistance No
Physical properties
Paint has hardened White
Self-leveling Yes
Electrical properties
Electrical insulation Yes
Curing values
Potting time (min) 30
Demolding time (min) 240
Product approvals
Food contact No
Suitable for medical use No
Mechanical properties
Shore hardness A (cured) A 28

For binding values, please refer to the technical data sheet (TDS) in the "Documents" tab.

No public documents are available.
We will gladly send you the TDS and SDS by email upon request; please submit a request.

Frequently asked questions about RTV 3428

Practical questions regarding processing and design — answered by SILITECH.

Bluesil RTV 3428 A & B: 2K platinum silicone with exceptionally high elongation at break (600%) and maximum tear resistance (20 kN/m) for highly stressed molds. Main applications include complex shapes with undercuts, long-life production molds, clay models, and sculptures.

Polyaddition crosslinking is a two-component silicone chemistry using a platinum catalyst. Component A contains the platinum complex, and component B contains the SiH crosslinker. When mixed, the components crosslink without releasing reaction byproducts—no shrinkage due to outgassing, excellent dimensional accuracy, and low linear shrinkage. Important: Polyaddition silicones are inhibited by various substances—sulfur-vulcanized natural rubbers, tin-catalyzed RTV silicones, amine-catalyzed epoxy resins, and tin-stabilized PVC. In case of doubt, a preliminary test should be carried out.

Thoroughly stir components A and B before each processing step. Measure precisely according to the mixing ratio specified in the TDS (see comparison table above) – ideally by weight. Mix with an electric or pneumatic agitator at low speed (minimize air entrainment). Degas the mixture under vacuum (30–50 mbar) – the material will expand 3–4 times its original volume, bubbles will escape, and the material will settle back after 5–10 minutes. Then slowly pour into the mold from the lowest point to avoid air entrapment. For polyaddition systems, avoid contact with inhibitors (sulfur-based rubber, tin-based RTV, amine epoxides, PVC with tin salts).

Store in the unopened original container in a dry, cool place — typically between +5 and +30 °C, see TDS for exact values. Store components A and B separately; seal airtight after opening. Polyaddition systems are insensitive to moisture, but should be stored in a cool place to maintain pot life. Consult the Safety Data Sheet (SDS) before use.

The comparison table above lists related RTV products with different hardnesses, pot lives, or application profiles. If you are unsure which product is best for you, we would be happy to advise you — contact SILITECH with details of your application (substrate, desired hardness, processing time, mechanical requirements, and durability).

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Product specifications

Product information
Container 1.1 kg or 5.5 kg or 22 kg
brand Bluesil
Manufacturer Elkem Silicones
Mixing ratio 1:1
Networking type Addition (Platinum)
Number of components 2K (two-component)
consistency Flowable
Mixing ratio 10:1
Other features
UV resistance No
Physical properties
Paint has hardened White
Self-leveling Yes
Electrical properties
Electrical insulation Yes
Curing values
Potting time (min) 30
Demolding time (min) 240
Product approvals
Food contact No
Suitable for medical use No
Mechanical properties
Shore hardness A (cured) A 28
Keywords
Keywords
Weiss Mold Making Silicone BLUESIL 2K Silicone ELKEM Swiss Bearing Aerospace RTV Addition Platinum Complete Kit Ready to Mix Prototyping RTV 3428 Shore A 28 High Elongation High Tear Strength Composite Mold Boatbuilding Thermal Expansion Former Flexible Mold
Mechanical properties
Shore hardness A28.0 Shore A
Tensile strength7.5 MPa
Elongation at break600.0 %
Tear resistance20.0 kN/m
Linear shrinkage< 0.1 %
processing
Viscosity Comp. A25,000 mPa·s
Viscosity Comp. B8,000 mPa·s
Pot life at 23°C60.0 min
demolding time960.0 min
Physical & Thermal
Density (23°C)1.1 g/cm³
Temperature resistance (duration)-55 to 200 °C
Peak temperature (short-term)200 °C
storage
Shelf life in original packaging20 months
Storage temperature-10 to 30 °C