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BLUESIL RTV 3445 B

BLUESIL RTV 3445 B

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2K-Pt silicone with Shore A 45.

2K-Pt silicone with Shore A 45 — high hardness for stable tool molds with good detail reproduction in model and prototype construction

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  • Manufacturer
  • Mixing ratio
  • Networking type
  • Container
  • Number of components
  • consistency
  • Mixing ratio
  • UV resistance
  • Paint has hardened
  • Self-leveling
  • Density (g/cm³)
  • Viscosity uncrosslinked (mPa·s)
  • Electrical insulation
  • Potting time (min)
  • Demolding time (min)
  • Food contact
  • Suitable for medical use
  • Tensile strength (MPa)
  • Elongation at break (%)
  • Tensile strength (N/mm)

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Blue mold making silicone BLUESIL 2K silicone ELKEM Swiss bearing RTV Addition Platinum catalyst Prototyping medium hardness RTV 3445 Shore A 45 low mixed viscosity

 
General Terms and Conditions.

Shipping usually within 1 to 3 business days
(availability will be confirmed after ordering)

. 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.

General Terms and Conditions →

Product data

HS code: 39100000

HS code: 39100000

BLUESIL RTV 3445 B
BLUESIL RTV 3445 B
Bluesil · Elkem Silicones ·

Bluesil RTV 3445 A & B is a 2K-Pt silicone with Shore A 45 — high hardness for stable tool molds with good detail reproduction in model and prototype construction.

This product line comprises 2K polyaddition silicone elastomers (platinum-catalyzed) for mold making — without reaction byproducts, offering excellent detail reproduction and reusability. RTV 3445 is tailored to specific industrial applications — the most important properties and areas of application are listed below.

Higher hardness (Shore A 45)

Bluesil RTV 3445 is the high-hardness variant of the RTV series — Shore A 45 for particularly stable molds, combined with good tear resistance (15 kN/m) and elongation at break 300 %.

RTV 3445 in numbers
Shore A 45
hardness
5 MPa
Tensile strength
300 %
Elongation at break
15 kN/m
Tear resistance

What makes the RTV 3445 stand out

High hardness (Shore A 45)
Stable form for demanding industrial prototypes.
Good mechanics
5 MPa tensile strength + 15 kN/m tear strength — robust tool shape.
Fast networking
1 hour pot life, 6 hours demolding — productive workflow.
Low shrinkage
Accurate reproduction without delay.
Simple processing
13,000 mPa·s mixing viscosity — easily degassable and pourable.
Model and mold making standard
A proven choice for fast and efficient prototype production.

What is the RTV 3445 used for?

Industrial prototype tools
Extremely hard shapes with good stability.
Model making
Reproduction of workpieces in technical model making.
Functional prototypes
Precision tools for engineering applications.
Polyester reproduction
Molds for polyester casting with high requirements.
Lost-wax casting process
Stable shape for multiple uses.
Medium series
Suitable for small series and prototype production.
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 3445 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 3445
Current product		 RTV 3450 →RTV 3440 →RTV 3428 →
Networking system2K Polyaddition (Pt)2K Polyaddition (Pt)2K Polyaddition (Pt)2K Polyaddition (Pt)
Mixing ratio10 : 110 : 110 : 110 : 1
ColorBeige / blue (B)Beige / black / translucentBeige / blue (B)Transparent / pink / white
Shore A hardnessA 45A 50A 40A 28
Elongation at break300 %300 %300 %600 %
Tensile strength5 MPa5 MPa4 MPa7.5 MPa
Tear resistance15 kN/m8 N/mm9 N/mm20 kN/m
Potting time1 h90 min90 min1 h
demolding time6 h16 h6 h16 h
Mixed viscosity13,000 mPa·s15,000 mPa·s15,000 mPa·s≈25,000 mPa·s
Main applicationIndustrial prototype toolsHigh-stress tool moldsPlaster reproductionComplex shapes with undercuts
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
Blue mold making silicone BLUESIL 2K silicone ELKEM Swiss bearing RTV Addition Platinum catalyst Prototyping medium hardness RTV 3445 Shore A 45 low mixed viscosity

Technical data for BLUESIL RTV 3445 B

All 21 product information 8 Further properties 1 Physical properties 4 Electrical properties 1 Curing values ​​2 Product approvals 2 Mechanical properties 3
Product information
brand Bluesil
Manufacturer Elkem Silicones
Mixing ratio 10 : 1
Networking type Addition (Platinum)
Container 100 g, 500 g, 2 kg, 25 kg
Number of components 2K (two-component)
consistency Flowable
Mixing ratio 10:1
Other features
UV resistance No
Physical properties
Paint has hardened Blue
Self-leveling Yes
Density (g/cm³) 1.3
Viscosity uncrosslinked (mPa·s) 40'000
Electrical properties
Electrical insulation No
Curing values
Potting time (min) 90
Demolding time (min) 24
Product approvals
Food contact No
Suitable for medical use No
Mechanical properties
Tensile strength (MPa) 4
Elongation at break (%) 300
Tensile strength (N/mm) 9

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) 3
Bluesil RTV 3445 B - Technical Data Sheet DE.pdf
163 KB
Bluesil RTV 3445 B - Technical Data Sheet EN.pdf
157 KB
Bluesil RTV 3445 B - Fiche Technique FR.pdf
173 KB

Frequently asked questions about RTV 3445

Practical questions regarding processing and design — answered by SILITECH.

Bluesil RTV 3445 A & B: 2K platinum silicone with Shore A 45 — high hardness for stable tool molds with good detail reproduction in model and prototype construction. Main applications include industrial prototype tools, model making, and functional prototypes.

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 100 g or 500 g or 2 kg or 25 kg
brand Bluesil
Manufacturer Elkem Silicones
Mixing ratio 10 : 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 Blue
Self-leveling Yes
Density (g/cm³) 1.3
Viscosity uncrosslinked (mPa·s) 40'000
Electrical properties
Electrical insulation No
Curing values
Potting time (min) 90
Demolding time (min) 24
Product approvals
Food contact No
Suitable for medical use No
Mechanical properties
Tensile strength (MPa) 4
Elongation at break (%) 300
Tensile strength (N/mm) 9
Keywords
Keywords
Blue mold making silicone BLUESIL 2K silicone ELKEM Swiss bearing RTV Addition Platinum catalyst Prototyping medium hardness RTV 3445 Shore A 45 low mixed viscosity
Mechanical properties
Linear shrinkage< 0.1 %
processing
Viscosity Comp. B200 mPa·s
Pot life at 23°C60.0 min
demolding time1440.0 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 packaging12 months
Storage temperature-10 to 30 °C

Documents and datasheets

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