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BLUESIL RTV 3040 A

BLUESIL RTV 3040 A

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High-strength, clear 2K addition-curing silicone rubber for prototype molds.

High-strength, clear 2K addition-curing silicone rubber (Pt) for prototype molds with excellent detail reproduction and PU resin resistance

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  • brand
  • Manufacturer
  • Networking type
  • Container
  • Number of components
  • consistency
  • Mixing ratio
  • UV resistance
  • Paint has hardened
  • Self-leveling
  • Viscosity uncrosslinked (mPa·s)
  • Electrical insulation
  • Food contact
  • Suitable for medical use
  • Tensile strength (MPa)
  • Elongation at break (%)

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Transparent mold making silicone BLUESIL 2K silicone ELKEM Swiss bearing RTV Addition Platinum base component RTV 3040 Prototyping Urethane-resistant polyurethane SLA 3D reproduction

 
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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.
Shipping & Delivery

Usually 1 to 3 working days

Availability will be confirmed after order receipt.

Express logistics within Switzerland & Europe.

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Product data

HS code: 39100000

HS code: 39100000

BLUESIL RTV 3040 A
BLUESIL RTV 3040 A
Bluesil · Elkem Silicones ·

Bluesil RTV 3040 A & B is a high-strength, clear 2K addition-curing silicone rubber (Pt) for prototype molds with excellent detail reproduction and PU resin resistance.

This product line comprises 2K polyaddition silicone elastomers (platinum-catalyzed) for mold making — without reaction byproducts, offering excellent detail reproduction and reusability. RTV 3040 is tailored to specific industrial applications — the most important properties and areas of application are listed below.

Designed for the prototyper

Bluesil™ RTV 3040 is specifically formulated for prototype construction — it reproduces the finest details, maintains tight tolerances, and is resistant to polyurethane resins. Its low viscosity (50,000 mPa·s) makes casting and degassing particularly easy.

RTV 3040 in figures
Pt-Cure
Polyaddition
Shore A 38
hardness
340 %
Elongation at break
21 N/mm
Tear resistance

What makes the RTV 3040 stand out

Prototyper standard
Designed for the rapid reproduction of complex geometries with the finest details — including SLA stereolithography models.
High tensile strength (21 N/mm)
Withstands multiple demolding cycles with demanding geometries — long mold lifespan.
PU resin resistant
Specifically formulated for reuse with polyurethane casting resins — no swelling or curing problems.
Low viscosity, easy venting
50,000 mPa·s base pressure — easily pourable, quickly degassed.
Variable hardness via catalyst
CATA 3038 / 3040 / 3045 allow Shore A 36 / 38 / 45 — tailored to the application.
Very low linear shrinkage (<0.1%)
Accurate reproduction with room temperature cross-linking.

What is the RTV 3040 used for?

Conventional production and prototype forms
Long-life serial molds for industrial and prototype construction.
Stereolithography (SLA) molds
Direct molding of SLA printed models with the finest level of detail.
PU casting resin replicas
Multiple reproduction of PU components without shape degradation.
Complex undercuts
Low hardness (Shore 38) allows for the demolding of complex geometries.
silicone prefabricated parts
Direct casting of silicone end products in small production runs.
Engineering prototypes
Dimensionally accurate functional prototypes with tight tolerances.
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 3040 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 3040
Current product		 RTV 3041 →RTV 3450 →RTV 3440 →
Networking system2K Polyaddition (Pt)2K Polyaddition (Pt)2K Polyaddition (Pt)2K Polyaddition (Pt)
Mixing ratio10 : 110 : 110 : 110 : 1
ColorClear to straw yellowTransparentBeige / black / translucentBeige / blue (B)
Shore A hardnessA 38A 38A 50A 40
Elongation at break340 %350 %300 %300 %
Tensile strength6.3 MPa5.5 MPa5 MPa4 MPa
Tear resistance21 N/mm22 N/mm8 N/mm9 N/mm
Potting time60 min75 min90 min90 min
demolding time24 h<24 h16 h6 h
Mixed viscosity50,000 mPa·s42,000 mPa·s15,000 mPa·s15,000 mPa·s
Main applicationConventional production and prototype formsReproduction of PU componentsHigh-stress tool moldsPlaster reproduction
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
Transparent mold making silicone BLUESIL 2K silicone ELKEM Swiss bearing RTV Addition Platinum base component RTV 3040 Prototyping Urethane-resistant polyurethane SLA 3D reproduction

Technical data for BLUESIL RTV 3040 A

All 16 product information 7 Further properties 1 Physical properties 3 Electrical properties 1 Product approvals 2 Mechanical properties 2
Product information
brand Bluesil
Manufacturer Elkem Silicones
Networking type Addition (Platinum)
Container 1 kg, 20 kg
Number of components 2K (two-component)
consistency Flowable
Mixing ratio 10:1
Other features
UV resistance No
Physical properties
Paint has hardened Transparent
Self-leveling Yes
Viscosity uncrosslinked (mPa·s) 24
Electrical properties
Electrical insulation No
Product approvals
Food contact No
Suitable for medical use No
Mechanical properties
Tensile strength (MPa) 412
Elongation at break (%) 412

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

Documents and datasheets

Click on a document for a preview or the download icon for a direct download.

Technical Data Sheets (TDS) 1
Bluesil RTV 3040 A U1 - Technical Data Sheet EN.pdf
556 KB

Frequently asked questions about RTV 3040

Practical questions regarding processing and design — answered by SILITECH.

Bluesil RTV 3040 A & B: High-strength, clear, 2-component addition-curing silicone rubber (Pt) for prototype molds with excellent detail reproduction and PU resin resistance. Main applications include conventional production and prototype molds, stereolithography (SLA) molds, and PU casting resin replicas.

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 kg or 20 kg
brand Bluesil
Manufacturer Elkem Silicones
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 Transparent
Self-leveling Yes
Viscosity uncrosslinked (mPa·s) 24
Electrical properties
Electrical insulation No
Product approvals
Food contact No
Suitable for medical use No
Mechanical properties
Tensile strength (MPa) 412
Elongation at break (%) 412
Keywords
Keywords
Transparent mold making silicone BLUESIL 2K silicone ELKEM Swiss bearing RTV Addition Platinum base component RTV 3040 Prototyping Urethane-resistant polyurethane SLA 3D reproduction
Mechanical properties
Shore hardness A38.0 Shore A
Tensile strength6.3 MPa
Elongation at break340.0 %
Tear resistance21.0 kN/m
Linear shrinkage< 0.1 %
processing
Viscosity of mixture40,000 mPa·s
Viscosity Comp. A50,000 mPa·s
Pot life at 23°C120.0 min
demolding time1200.0 min
Physical & Thermal
Density (23°C)1.08 g/cm³
Temperature resistance (duration)-54 to 204 °C
Peak temperature (short-term)204 °C
storage
Shelf life in original packaging18 months
Storage temperature-5 to 30 °C

Documents and datasheets

Safety Data Sheets (SDS) and Technical Data Sheets (TDS) are available for download: