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PERMABOND ET 5441

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Permabond ET 5441 — Epoxy structural adhesive, Shore D 65-75.

Thermally conductive UL94-V0 2K epoxy — Heat sinks, batteries, 30% strength at 200 °C.

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  • Color (A)
  • Viscosity 20rpm (A)
  • Viscosity 2rpm (A)
  • Specific gravity (A)
  • Chemical group (B)
  • Color (B)
  • Viscosity 20rpm (B)
  • Viscosity 2rpm (B)
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  • Country of origin
  • Operating temperature (°C)
  • Mixing ratio
  • Color
  • Viscosity (adhesives)
  • Hardness (Shore D)
  • Storage temperature (°C)
  • Maximum gap width (mm)
  • Drip time at 23°C
  • Handling strength at 23°C
  • Functional strength
  • Peel resistance (aluminum) (ISO 4578)
  • UFI Part A
  • UFI Part B
  • Steel
  • aluminum
  • Glass/Polyester
  • Glass/epoxy
  • carbon fiber
  • Peel resistance (aluminum) (ISO 4578)
  • Peel resistance (aluminum)* cured for 15 minutes at 200°C
  • Elongation at break
  • Dielectric strength

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Metal, plastic, ceramic, wood

 
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

Internal reference: 49-5441.KT

HS code: 3506.9190000

Internal reference: 49-5441.KT
HS code: 3506.9190000

PERMABOND ET 5441
PERMABOND ET 5441
Permabond · Permabond Engineering Adhesives Ltd · SKU 49-5441.KT

Permabond ET5441 is a thermally conductive 2K epoxy with UL94-V0 flame retardancy — designed for bonding heat sinks, batteries and power electronics with heat dissipation and fire protection requirements.

With a thermal conductivity of 1.0–1.4 W/(m·K), ET5441 is among the most thermally conductive 2K epoxies in the Permabond range—approximately ten times higher than standard epoxies. This property makes the product the first choice for bonding applications that require heat dissipation—heat sink mounting, battery bonding, and power electronics.

The UL94-V0 classification qualifies ET5441 for fire protection-relevant applications—for example, in electrical cabinets, control units, or e-mobility components. At 200 °C, the adhesive retains 30% of its strength, making it suitable for high-temperature applications.

PREMIUM FEATURES

Thermally conductive 2-component epoxy with UL94-V0 flame retardancy — a thermal conductivity of 1.0–1.4 W/(m·K) enables its use in bonding heat sinks, batteries, and power electronics. It retains 30% of its strength at 200 °C and is flame retardant according to UL94-V0.

Permabond ET5441 in figures
1,0–1,4
W/(m·K) thermal
UL94-V0
Flame retardant
30 %
Strength @ 200 °C
2:1
mixture

What distinguishes Permabond ET5441

Thermally conductive
1.0–1.4 W/(m·K) — Premium heat dissipation in the Permabond series.
UL94-V0 flame retardant
Fire protection certified for control cabinets, e-mobility, and industry.
High-temperature reserve
30% strength at 200 °C.
High strength
20-25 N/mm² steel, 25-30 N/mm² carbon fiber.
2:1 mixing ratio
Standard double cartridge.
Thixotropic
Does not drip — suitable for vertical applications.

What is Permabond ET5441 used for?

Heatsink bonding
LEDs, power electronics, CPU heat sinks.
Battery adhesive
E-mobility, stationary storage, lithium-ion applications.
Power electronics
Control cabinets, inverters, motor controls.
Fire protection applications
UL94-V0 certified for safety-critical installations.
High-temperature industrial bonding
Components with continuous temperatures up to 200 °C.

processing

1
Clean surfaces
Bonding surfaces must be clean, dry, and free of grease. Degrease with Permabond Cleaner A or a solvent (acetone, isopropanol). Lightly sand aluminum and copper to remove oxide layers.
2
Mix components A + B
For dual cartridges: Attach the mixing nozzle and press evenly (2:1 volume mixing ratio). For larger containers: Weigh out the resin and hardener in the correct ratio and mix thoroughly until no streaks are visible. Avoid air bubbles.
3
Apply adhesive + join components
Apply the mixed adhesive to a bonding surface within the pot life (30–40 minutes @ 23 °C). Join the components with sufficient pressure to ensure the adhesive is distributed over the entire bonding surface.
4
Fix components in place during curing
Use a clamping device or vise to prevent the components from moving during curing. Wait for handling strength and functional strength to be determined according to the TDS (Technical Data Sheet).
5
Full curing at room temperature
Final strength is typically reached after 24 hours at 23 °C. Increasing the temperature by 8 °C halves the curing time; lower temperatures slow down the process. If required, optional post-curing at 60–80 °C for maximum strength.
Data sheets & safety data sheet
Full TDS and SDS in DE, EN, FR — view or download directly.
To the documents →

Recommended accessories

SILISIL Adhesive Dispensing Gun 50 ml
Manual dispensing gun for 50 ml twin cartridges with 1:1 and 2:1 mixing ratios — precise dispensing without waste for multi-component adhesives.
View product →
Permabond Cleaner A Aerosol
Spray cleaner for quickly degreasing the bonding surfaces before applying the 2K epoxy.
View product →
Permabond ET515 — aerospace star
Highly flexible 1:1 epoxy for aircraft seat trays and composite structural bonding — Permabond recommended for aerospace.
View product →
Permabond ET5162 — Food
EU 10/2011 + FDA compliant for direct food contact — the premium choice for food processing.
View product →
Permabond ET5441 — Thermally conductive
UL94-V0 + 1.0–1.4 W/(m·K) thermal conductivity — for heat sinks, batteries and power electronics.
View product →

Important instructions

Important instructions
For direct contact with lithium-ion cells, test compatibility. Before bonding, degrease surfaces and, if necessary, sand them. Paste consistency – apply directly from the dual cartridge with mixing nozzle.
storage
Store at 5 to 25 °C. Keep 2K epoxy components in closed packaging — protect the hardener especially from moisture.

Which Permabond 2K epoxy is suitable for which application?

Permabond ET5441 in direct comparison with related products of the ET series.

Permabond ET5441
Current product		Permabond ET5411 →Permabond ET515 →Permabond ET5422 →
Application / PropertyThermally conductive 2-component epoxy 2:1 — Heat sinks, batteries, UL94-VEven at high temperatures, without UL94Flexible without TCHigher strength without TC
Mixing ratio2:1 volume parts2:11:1100:44
Potting time30–40 minutes @ 23 °C—10–20 min—
Steel shear strength20–25 N/mm²—8–12 N/mm²22–26 N/mm²
carbon fiber25–30 N/mm²—8–12 N/mm²20-30 N/mm²
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
Metal, plastic, ceramic, wood

Technical data for PERMABOND ET 5441

All 36 product information 5 Physical properties A 6 Physical properties B 6 Performance at final strength 4 Bonding properties 1 Physical properties 2 Curing values ​​3 Mechanical properties 1 Shear strength ISO 4587 in N/mm² 5 Thermal properties 2 General 1
Product information
Manufacturer Permabond Engineering Adhesives Ltd
brand Permabond
Container 50 ml, 400 ml
Country of origin Italy
Mixing ratio 2:1
Physical properties A
Chemical group (A) epoxy resin
Color (A) White
Viscosity 20rpm (A) 60000-120000
Viscosity 2rpm (A) 250000-450000
Specific gravity (A) 1.2
UFI Part A 24G0-00XS-N00H-31R9
Physical properties B
Chemical group (B) Polyamine hardener
Color (B) Black
Viscosity 20rpm (B) 50000-100000
Viscosity 2rpm (B) 150000-250000
Specific gravity (B) 1.1
UFI Part B 2281-70HJ-300K-N9A9
Performance at final strength
Peel resistance (aluminum) (ISO 4578) 30-50 N/25mm
Peel resistance (aluminum) (ISO 4578) 140-160 N/25mm
Elongation at break 4-8%
Dielectric strength 15-25 kV/mm
Properties of the adhesive
Functional strength 24-48 hours
Physical properties
Color Amber
Viscosity (adhesives) Thick paste
Curing values
Maximum gap width (mm) 5
Drip time at 23°C 10-12 minutes
Handling strength at 23°C 60-90 minutes
Mechanical properties
Hardness (Shore D) 65-75
Shear strength ISO 4587 in N/mm²
Steel 20-30
aluminum 20-25 N/mm²
Glass/Polyester 6-8 N/mm²
Glass/epoxy 19-23 N/mm²
carbon fiber 22-24 N/mm²
Thermal properties
Operating temperature (°C) -40 to +140
Storage temperature (°C) 5-25
Generally
Peel resistance (aluminum)* cured for 15 minutes at 200°C 250-300 N/25mm

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
Permabond ET 5441 - Technical Data Sheet EN.pdf
344 KB
Safety Data Sheets (SDS) 3
Permabond ET 5441 - Safety Data Sheet DE.pdf
397 KB
Permabond ET 5441 - Safety Data Sheet EN.pdf
375 KB
Permabond ET 5441 - Fiche de Sécurité FR.pdf
396 KB

Frequently asked questions about Permabond ET 5441

Practical application and design questions — answered by SILITECH.

Thermally conductive UL94-V0 epoxy for heat sinks and batteries — 1.0–1.4 W/(m·K), 30% strength at 200 °C. The 2-component epoxy is mixed in a 2:1 volume ratio and offers a pot life of 30–40 minutes @ 23 °C.

Mix both components in a 2:1 ratio by volume — use the mixing nozzle for dual cartridges, weigh precisely for larger containers. Apply within the pot life (30–40 minutes @ 23 °C) and join components. Full curing typically occurs after 24 hours at room temperature.

The pot life of Permabond ET5441 is typically 30–40 minutes at 23 °C. Higher temperatures shorten, lower temperatures lengthen the pot life. Mixtures above approximately 100 g may gel more quickly due to an exothermic reaction.

Permabond ET5441 bonds reliably to: Steel: 20–25 N/mm²; Aluminum: —; Carbon fiber: 25–30 N/mm². For thermoplastic substrates, test compatibility before series production.

Permabond ET5441 is approved according to: UL94-V0 Flame Retardancy, Retains 30% Strength at 200 °C. Compliance letters and detailed certificates are available from Permabond/SILITECH.

Permabond ET5441 is a thermally conductive 2-component epoxy 2:1 — for heat sinks, batteries, UL94-V0 (2:1 volume mix, 30–40 minutes pot life @ 23 °C). Permabond ET5411 is a high-temperature 2:1 (2:1, pot life) — also suitable for high-temperature applications, without UL94.

From the Permabond 2K epoxy range, select according to application, mixing ratio, and strength requirements: Permabond ET5441 (Thermally Conductive 2K Epoxy 2:1 — Heat Sinks, Batteries, UL94-V); Permabond ET5411 (High Temperature 2:1); Permabond ET515 (Aerospace Flexible); Permabond ET5422 (High Strength 100:44). For aerospace applications, see ET515 (Aircraft Seat Trays); for food applications, see ET5162 (EU 10/2011 + FDA); for thermal conductivity/fire protection, see ET5441 (UL94-V0).

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Product specifications

Product information
Container 50 ml or 400 ml
Manufacturer Permabond Engineering Adhesives Ltd
brand Permabond
Country of origin Italy
Mixing ratio 2:1
Physical properties A
Chemical group (A) epoxy resin
Color (A) White
Viscosity 20rpm (A) 60000-120000
Viscosity 2rpm (A) 250000-450000
Specific gravity (A) 1.2
UFI Part A 24G0-00XS-N00H-31R9
Physical properties B
Chemical group (B) Polyamine hardener
Color (B) Black
Viscosity 20rpm (B) 50000-100000
Viscosity 2rpm (B) 150000-250000
Specific gravity (B) 1.1
UFI Part B 2281-70HJ-300K-N9A9
Performance at final strength
Peel resistance (aluminum) (ISO 4578) 30-50 N/25mm, 140-160 N/25mm
Elongation at break 4-8%
Dielectric strength 15-25 kV/mm
Properties of the adhesive
Functional strength 24-48 hours
Physical properties
Color Amber
Viscosity (adhesives) Thick paste
Curing values
Maximum gap width (mm) 5
Drip time at 23°C 10-12 minutes
Handling strength at 23°C 60-90 minutes
Mechanical properties
Hardness (Shore D) 65-75
Shear strength ISO 4587 in N/mm²
Steel 20-30
aluminum 20-25 N/mm²
Glass/Polyester 6-8 N/mm²
Glass/epoxy 19-23 N/mm²
carbon fiber 22-24 N/mm²
Thermal properties
Operating temperature (°C) -40 to +140
Storage temperature (°C) 5-25
Uncategorized
Peel resistance (aluminum)* cured for 15 minutes at 200°C 250-300 N/25mm
Keywords
Keywords
Metal, plastic, ceramic, wood

Documents and datasheets

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