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BLUESIL Paste 340

BLUESIL Paste 340

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Thermally conductive silicone paste for protecting electrical circuits, for thermal seals on measuring instruments and sensors, and for sealing between resistors and metal parts in household appliances.

BLUESIL Paste 340 is a thermally conductive silicone paste based on polydimethylsiloxane with inert fillers. It is used for protecting electrical circuits, creating thermal seals for measurement and sensor technology, and for thermal bonding between resistors and metal parts in electrical devices. The paste offers good heat dissipation, chemical inertness, good dielectric properties, and a stable consistency over a wide temperature range.

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  • Manufacturer
  • Curing type
  • Container
  • Number of components
  • Consistency
  • Mixing Ratio
  • UV resistance
  • Cured Color
  • Self-leveling
  • Electrical Insulation
  • Food contact
  • Medical grade

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ELKEM BLUESIL silicone , Swiss-made silicone paste, 340 thermal interface paste for CPU cooling. Price list missing.

 
General Terms and Conditions

Shipping usually within 1 to 3 business days
(Availability confirmed after order)

Express logistics. Fast and reliable within Switzerland & Europe

From Swiss stock Dispatch within 24h Batch certificate Invoice 30 days (B2B) Technical advice
Shipping & Delivery

Usually 1 to 3 business days

Availability is confirmed after order receipt.

Express logistics within Switzerland & Europe.

Terms and Conditions →

Product data

HS Code: 39100000

HS Code: 39100000

BLUESIL Paste 340
BLUESIL Paste 340
Bluesil · Elkem Silicones ·

Bluesil Paste 340 is a thermally conductive silicone paste (PDMS + inert fillers) for thermal bonding between components — low viscosity change, dielectrically insulating.

Bluesil/Silbione silicone pastes — filled PDMS compounds for thermal bonding, vacuum sealing, dielectric insulation, and heat conduction applications. Paste 340 is tailored to specific applications — the most important properties and areas of application are listed below.

Thermal conductivity 0.41 W/m·K

Bluesil Paste 340 is a thermally conductive silicone paste based on PDMS with inert fillers — good thermal dissipation (0.41 W/m·K), chemically inert, good dielectric properties. Proven in the electronic thermal interface of sensors, resistors and thermal seals.

Paste 340 in numbers
0.41 W/m·K
Thermal conductivity.
+250 °C
maximum duration
15 kV/mm
Breakdown
White
Color

What makes Paste 340 stand out

Good thermal dissipation
0.41 W/m·K Thermal conductivity — Heat dissipation from building components.
Small viscosity change
Stable over a wide temperature range up to +250 °C.
Chemically inert
Stable in electronic applications.
Good dielectric properties
15 kV/mm breakdown, 10¹³ Ω·cm volume resistivity.
High density (2.2)
Stable paste with good heat transfer.

What is Paste 340 used for?

Electronics-heat connection
Thermal connection between components and heat sinks.
Sensor heat seal
Thermal seals for measuring instruments and sensors.
Household appliance resistors
Sealing between resistors and metal parts.
Industrial heat transfer
Thermal conductivity applications in industrial equipment.
Power electronics
Heat dissipation in power components.
Data Sheets & Safety Data Sheet
TDS and SDS in multiple languages — view or download directly.
To the documents →

Processing

1
Clean substrate
Bonding surfaces clean, dry, and grease-free. For thermal applications, degrease surfaces particularly carefully.
2
Application
Apply with brush, spatula, or paste gun — for thermal pastes, apply thinly and evenly (excess layer thickness reduces thermal conductivity).
3
Optionally dilute
For thin layers: dilute the paste in aliphatic or chlorinated solvents. For standard application, use undiluted.
4
Spreading / Pressing
For thermal bonding, join components with defined contact pressure — allow excess paste to escape.
5
Curing / Use
Pastes generally remain non-crosslinking — can be used immediately. Do not exceed typical thermal stress of 250 °C.

Recommended accessories

Bluesil Vacuum Grease
High-vacuum silicone grease for ground-glass and vacuum seals.
To the product →

Paste 340 in comparison

Direct comparison with related paste products in our range. “— "” = not specified in the data sheet.

Paste 340
Current Product		 Paste 4 →Paste 408 →Paste 7 →
ConsistencyThermal pasteUniversal PasteSpecial pasteIndustrial Paste
Penetration280 (1/10 mm)see TDSsee TDSsee TDS
Thermal conductivity.0.41 W/m·Ksee TDSsee TDSsee TDS
Temperature Range–40 / +250 °Csee TDSsee TDSsee TDS
ColorWhitesee TDSsee TDSsee TDS
Main applicationThermal bonding electronicsIndustrial universalBluesil Special ApplicationIndustrial lubricant/sealant
Topics & Application Fields
Key terms related to this product. Also useful for our search and filters.
ELKEM BLUESIL silicone , Swiss-made silicone paste, 340 thermal interface paste for CPU cooling. Price list missing.

Technical data for BLUESIL Paste 340

All 13 Product information 7 Further properties 1 Physical properties 2 Electrical properties 1 Product approvals 2
Product Information
Brand Bluesil
Manufacturer Elkem Silicones
Curing type Non-reactive
Container 3g, 100g, 100g can, 200g, 1kg, 2kg, 25kg
Number of components 1K (one-component)
Consistency Thixotropic
Mixing Ratio One-component
Further Properties
UV resistance Yes
Physical Properties
Cured Color White
Self-leveling No
Electrical Properties
Electrical Insulation Yes
Product Approvals
Food contact No
Medical grade No

Please refer to the technical data sheet (TDS) in the "Documents" tab for binding values.

No public documents available.
On request, we will gladly send you TDS and SDS by email, Submit request.

Frequently asked questions about Paste 340

Practical application and design questions — answered by SILITECH.

Bluesil Paste 340: Thermally conductive silicone paste (PDMS + inert fillers) for thermal bonding between components — low viscosity change, dielectric insulating. Main applications: Electronic thermal bonding, sensor thermal sealing, household appliance resistors.

Apply to clean, dry surfaces — degrease beforehand if necessary. Application with brush, spatula, or paste gun. For thermal pastes, apply thinly and evenly — excessive layer thickness reduces thermal conductivity. Pastes can be diluted with aliphatic or chlorinated solvents if thin layers are required.

Store in the unopened original container in a dry, cool place — typically standard between +5 and +30 °C, exact values see TDS. Consult the Safety Data Sheet (SDS) before use. Observe the expiration date on the packaging — Elkem guarantees the sales specifications only up to the stated date.

In the comparison table above, you will find related products with similar functions or related specifications. If you are unsure about the optimal choice, we will be happy to advise you — contact SILITECH with your application (desired property, substrate, processing workflow).

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Product Specifications

Product Information
Container 3 g or 100 g or 100 g can or 200 g or 1 kg or 2 kg or 25 kg
Brand Bluesil
Manufacturer Elkem Silicones
Curing type Non-reactive
Number of components 1K (one-component)
Consistency Thixotropic
Mixing Ratio One-component
Further Properties
UV resistance Yes
Physical Properties
Cured Color White
Self-leveling No
Electrical Properties
Electrical Insulation Yes
Product Approvals
Food contact No
Medical grade No
Keywords
Keywords
ELKEM BLUESIL silicone , Swiss-made silicone paste, 340 thermal interface paste for CPU cooling. Price list missing.
Physical & Thermal
Density (23°C)1.8 g/cm³
Temperature Resistance (Continuous)-40 to 200 °C
Peak Temperature (Short-term)200 °C
Storage
Shelf life in original packaging36 months
Storage Temperature2 to 40 °C