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BLUESIL RTV 141 A

BLUESIL RTV 141 A

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BLUESIL® RTV 141 A – Crystal-clear 2K silicone rubber for optical potting and embedding applications

Transparent, optically clear 2K-Pt silicone potting compound (Shore A 50) for embedding electronic components, optical fibers and barrier photocells

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  • brand
  • Manufacturer
  • Mixing ratio
  • Networking type
  • Number of components
  • consistency
  • Mixing ratio
  • UV resistance
  • Paint has hardened
  • Self-leveling
  • 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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Transparent silicone BLUESIL 2K silicone ELKEM Swiss bearing Electrical insulation RTV Addition Platinum Electronic potting Optoelectronics Light guide Optical clarity Base component

 
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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.

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Product data

Internal reference: 40-905

HS code: 39100000

Internal reference: 40-905
HS code: 39100000

BLUESIL RTV 141 A
BLUESIL RTV 141 A
Bluesil · Elkem Silicones · SKU 40-905

Bluesil RTV 141 A & B is a transparent, optically clear 2K-Pt silicone potting compound (Shore A 50) for embedding electronic components, optical fibers and barrier photocells.

This product line comprises 2K polyaddition silicone elastomers with optical clarity for electronics encapsulation, optoelectronics, and photovoltaic cells — defined refractive index, high transparency. RTV 141 is tailored to specific industrial applications — the most important properties and areas of application are listed below.

High transparency + optical transmission

Bluesil RTV 141 is a clear, transparent, two-component potting silicone with good optical transmission—specifically for encapsulating optical fibers, insulating photocells, and creating optoelectronic connections. It is reversibility-resistant even in the absence of air.

RTV 141 in numbers
Transparent
optically clear
Shore A 50
hardness
+200 °C
Peak temperature.
20 kV/mm
carbon copy

What makes RTV 141 stand out

Visually clear
Refractive index 1.406 — suitable for optical applications with index jumps.
High transparency
Direct view of embedded components — visual inspection possible.
Excellent reversibility resistance
The material remains fully cross-linked even when excluded from air.
Low mixed viscosity (4,000 mPa·s)
Good flow behavior — fills complex geometries.
Good mechanical properties
Shore A 50 + 6 MPa tensile strength + 120 % elongation at break.
Possibility of incorporating filler
Features can be specifically adapted.

What is the RTV 141 used for?

Optoelectronic connections
Optical fiber cladding with defined index jump (1.406).
Barrier layer photocell insulation
Encapsulation of photovoltaic cells with high transparency.
Electronic component potting
Filling and embedding compound for electronic devices.
LED potting
Optical applications requiring transparency and thermal stability.
Sensor encapsulation
Protection of sensitive sensors with optical vision.
Photovoltaic cell protection
Protection and insulation in solar applications.
Data sheets & safety data sheet
Full TDS and SDS in DE, EN, FR — view or download directly.
To the documents →

processing

1
Prepare component
Position the component cleanly and dry in the encapsulation mold. Align the optical axes.
2
Mix A & B
10:1 or 1:1 (see comparison table). Low-viscosity mixture — easily degassed.
3
Degas
30–50 mbar vacuum — important for bubble-free optics.
4
Shed
Pour slowly into the mold — refractive index 1.40 makes the material optically clear.
5
Curing
24–48 h at 23 °C or accelerated with heat up to +150 °C.

Recommended accessories

Bluesil Inhibitor 3
Pot life extender for polyaddition silicone systems (Pt-Cure).
View product →
Bluesil Primer PM 820
High-performance primers for polar plastics (PA, PES, ABS, PP) and composites.
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 141 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 141
Current product		 ESA 7250 →RTV 147 →ESA 6110 →
Networking system2K Polyaddition (Pt)2K Polyaddition (Pt)2K Polyaddition (Pt)2K Polyaddition (Pt) Gel
Mixing ratio10 : 110 : 110 : 11 : 1
ColorTransparent, colorlessOptically clear, colorlessBeige / light blue (B)Visually clear
Shore A hardnessA 50A 52A 60Gel (Penetration 250)
Elongation at break120 %115 %180 %—
Tensile strength6 MPa6.2 MPa6 MPa—
Tear resistance—4 kN/m>15 kN/m—
Potting time4 h4 h2 h50 min (Std) / 5 min (QC)
demolding time24–48 h24–48 h24–48 h120–180 min
Mixed viscosity4,000 mPa·s4,000 mPa·s150,000 mPa·s1,200 mPa·s
Main applicationOptoelectronic connectionsElectronic pottingThermal insulation devicesElectronic encapsulation (potting)
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
Transparent silicone BLUESIL 2K silicone ELKEM Swiss bearing Electrical insulation RTV Addition Platinum Electronic potting Optoelectronics Light guide Optical clarity Base component

Technical data for BLUESIL RTV 141 A

All 19 product information 7 Further properties 1 Physical properties 3 Electrical properties 1 Curing values ​​2 Product approvals 2 Mechanical properties 3
Product information
brand Bluesil
Manufacturer Elkem Silicones
Mixing ratio A : B = 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 Transparent
Self-leveling Yes
Viscosity uncrosslinked (mPa·s) 25'000
Electrical properties
Electrical insulation Yes
Curing values
Potting time (min) 60
Demolding time (min) 5
Product approvals
Food contact No
Suitable for medical use No
Mechanical properties
Tensile strength (MPa) 6.5
Elongation at break (%) 500
Tensile strength (N/mm) 21

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 141 A E5 - Technical Data Sheet DE.pdf
197 KB
Bluesil RTV 141 A E5 - Technical Data Sheet EN.pdf
547 KB
Bluesil RTV 141 A E5 - Fiche Technique FR.pdf
205 KB
Safety Data Sheets (SDS) 3
Bluesil RTV 141 A E5 - Safety Data Sheet DE.pdf
241 KB
Bluesil RTV 141 A E5 - Fiche de Sécurité FR.pdf
440 KB
Bluesil RTV 141 A E5 - Scheda di Sicurezza IT.pdf
433 KB

Frequently asked questions about RTV 141

Practical questions regarding processing and design — answered by SILITECH.

Bluesil RTV 141 A & B: Transparent, optically clear 2K Pt silicone potting compound (Shore A 50) for embedding electronic components, optical fibers, and junction photocells. Main applications include optoelectronic connections, junction photocell insulation, and electronic component potting.

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
brand Bluesil
Manufacturer Elkem Silicones
Mixing ratio A : B = 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 Transparent
Self-leveling Yes
Viscosity uncrosslinked (mPa·s) 25'000
Electrical properties
Electrical insulation Yes
Curing values
Potting time (min) 60
Demolding time (min) 5
Product approvals
Food contact No
Suitable for medical use No
Mechanical properties
Tensile strength (MPa) 6.5
Elongation at break (%) 500
Tensile strength (N/mm) 21
Keywords
Keywords
Transparent silicone BLUESIL 2K silicone ELKEM Swiss bearing Electrical insulation RTV Addition Platinum Electronic potting Optoelectronics Light guide Optical clarity Base component
Mechanical properties
Shore hardness A50.0 Shore A
Tensile strength6.0 MPa
Elongation at break120.0 %
Linear shrinkage< 1.2 %
processing
Viscosity of mixture4,000 mPa·s
Viscosity Comp. A3,500 mPa·s
Viscosity Comp. B650 mPa·s
Pot life at 23°C240.0 min
demolding time2160.0 min
Physical & Thermal
Density (23°C)1.02 g/cm³
Refractive index n (20°C)1.406
Temperature resistance (duration)-70 to 200 °C
Peak temperature (short-term)200 °C
thermal conductivity0.16 W/(m·K)
Electrical characteristics
Dielectric constant ε (1 kHz)2.7
Dielectric strength20.0 kV/mm
Contact resistance1e+15 Ω·cm
Loss factor tan δ0.001
storage
Shelf life in original packaging24 months
Storage temperature-5 to 30 °C

Documents and datasheets

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