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Permabond 240

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Permabond 240 — Cyanoacrylate instant adhesive, viscosity 1200–2500 mPa·s, Shore D 85.

High-viscosity industrial adhesive (formerly C4) with extended cure time — ideal for foamed elastomers and large components that require more time for adjustment.

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  • manufacturer
  • thermal conductivity
  • thermal expansion coefficient
  • WRAS Drinking Water Approval
  • brand
  • container
  • Color
  • country of origin
  • Chemical group
  • Viscosity (adhesives)
  • Viscosity mPa·s
  • Specific gravity
  • Maximum gap width (mm)
  • Steel strength (sec.)
  • Rubber setting time (sec.)
  • Hand strength Phenol (sec.)
  • steel
  • ABS
  • polyvinyl chloride
  • PC
  • phenol
  • Operating temperature (°C)
  • Hardness (Shore D)
  • Storage temperature (°C)
  • ultimate strength
  • Impact resistance (ASTM D-950)
  • dielectric strength
  • UFI (Unique Formula Identifier)
  • MIL-A-46050C Type II Class 3

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Solvent-free High viscosity Permabond Cyanoacrylate adhesive MIL-A-46050C Type II Class 3

 
Terms and Conditions

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

Express logistics. Fast and reliable within Switzerland & Europe

Ships from our Swiss warehouse Shipped within 24 hours Batch certificate 30-day invoice (B2B) Technical support
Shipping & Delivery

Usually 1 to 3 business days

Availability will be confirmed once the order is received.

Express logistics within Switzerland and Europe.

Terms and Conditions →

Product Information

Internal reference: 49-237.FL

HS Code: 3506.9190000

Internal reference: 49-237.FL
HS Code: 3506.9190000

Permabond 240
Permabond 240
Permabond · Permabond Engineering Adhesives Ltd · SKU 49-237.FL

Permabond 240 (formerly C4) is a high-viscosity, slow-curing cyanoacrylate adhesive—specifically designed for bonding large components, foamed elastomers, and applications where more time is needed to precisely align the parts.

With a viscosity of 1,200–2,500 mPa·s, a gap-filling capacity of up to 0.4 mm, and a deliberately slower cure rate (15–20 seconds to reach hand-set consistency), Permabond 240 stands out from standard fast-curing cyanoacrylate adhesives: it gives users time to make precise adjustments instead of having to work under pressure.

Its high viscosity also allows for reliable bonding of foamed elastomers and porous materials, into which low-viscosity cyanoacrylates would simply seep away.

APPROVALS

MIL-A-46050C Type II Class 3 — qualified for industrial and defense applications. Additionally, WRAS Drinking Water Approval (cold water use only) — British standard for direct contact with cold drinking water.

Permabond 240 by the Numbers
1,200–2,500
mPa·s viscosity
15–20 seconds
Firmly on steel
21–25
N/mm² steel
MIL
A-46050C Class 3

What sets Permabond 240 apart

Extended adjustment time (15–20 s)
Cures more slowly than standard CAs—giving users time to position components accurately without feeling rushed.
Suitable for large components
The slower cure time makes it possible to bond large-area or bulky components where fast-curing adhesives would have set too quickly.
Bonded foamed elastomers
Its high viscosity prevents it from seeping into open-cell foams—a challenge that low-viscosity cyanoacrylates cannot overcome.
MIL-A-46050C Type II Class 3
International certification for high-viscosity cyanoacrylates — suitable for demanding industrial and defense applications.
Substrate failure in ABS, PVC, and PC
On PVC, shear strength exceeds 11 N/mm² with substrate failure—above average for a cyanoacrylate. The bond is stronger than the material itself.
High viscosity, no dripping
1,200–2,500 mPa·s remains in place where applied—even on vertical surfaces or when applied in controlled spots.

What is Permabond 240 used for?

Foamed elastomers and foams
EPDM foam, foam rubber, PU foams — Permabond 240 does not wick away, but remains in the gap and fills the open pores on the surface.
Bonding of large components
Where instant adhesives would cure too quickly—for example, long butt joints, bulky housing components, or multi-part assemblies.
Plastic bond failures
ABS (>8 N/mm²), PVC (>11 N/mm²), polycarbonate (>5 N/mm²) — all with substrate failure.
Metal bonding with a curing time
Steel (21–25 N/mm²), aluminum, zinc — for complex geometries where alignment takes time.
Extended processing time required
Manual applications, repairs, prototyping—anywhere standard CAs would be too fast.

processing

1
Clean surfaces
Surfaces to be bonded must be clean, dry, and free of grease. We recommend Permabond Cleaner A for degreasing. Lightly sand aluminum, copper, and alloys to remove the oxide layer.
2
Apply a thin layer of adhesive
Apply a small amount of Permabond 240 to the bonding surface—usually one drop is enough. Its high viscosity ensures it stays in place.
3
Align and fit components
Assemble quickly—the longer curing time gives you time to align the parts properly. Apply even pressure so that the adhesive spreads into a thin film.
4
Let it set until firm
Do not disturb or reposition the components until the bond has reached its initial strength (15–20 seconds on steel, Buna-N, and phenolic resin). Full strength is achieved after 24 hours.
5
Remove adhesive residue
Excess adhesive can be removed with Permabond CA Solvent 2.
Data Sheets & Safety Data Sheets
Complete TDS and SDS in German, English, and French — view online or download.
Go to the documents →

Recommended Accessories

Permabond Activator CSA
Accelerates curing and allows bonding to porous or acidic surfaces. Recommended by the TDS for 240.
Go to product →
Permabond POP Primer
Polyolefin primer for the pretreatment of PP, PE, PTFE, and silicone.
Go to product →
Permabond Cleaner A Aerosol
Spray cleaner — specifically recommended for degreasing in the Permabond TDS for 240.
Go to product →
Permabond CA Solvent 2
Special solvent for removing cured CA residue — recommended by TDS for 240.
Go to product →

Important information

Processing Instructions
For PP, PE, PTFE, and silicone, pretreatment with Permabond POP Primer is required. For porous or acidic surfaces, we recommend Permabond CSA Activator.
storage
Store refrigerated at 2–7 °C. Allow the bottle to come to room temperature before opening—this prevents condensation and helps preserve the product.

Which Permabond for which application?

Permabond 240 in direct comparison with related high-viscosity and impact-resistant cyanoacrylates.

Permabond 102 → Permabond 2050 → Permabond 2010 →
Permabond 240
Current Product
viscosity70–90 mPa·s1,200–1,800 mPa·s2000–2500 (thixotropic)1,500–2,500 mPa·s
Max. gap filling0.15 mm0.2 mm0.5 mm0.4 mm
Firmly on steel10–15 seconds10–15 seconds10–15 seconds15–20 seconds (slow)
Shear strength of steel19–23 N/mm²16–20 N/mm²19–23 N/mm²21–25 N/mm²
hardness85 Shore D85 Shore D85 Shore D85 Shore D
MIL-A-46050CType II, Class 2——Type II, Class 3
Strength / Recommended forGeneral-purpose bonding,
larger gap		Vibration, impact,
flexible seam		Vertical, Drinking Water
s (WRAS)		Foamed elastomers,
large components, setup time
Topics & Areas of Application
Keywords related to this product. Also useful for our search and filter functions.
Solvent-free High viscosity Permabond Cyanoacrylate adhesive MIL-A-46050C Type II Class 3

Technical Specifications for Permabond 240

All 29 Product Information 5 Performance at ultimate strength 2 Physical properties 5 Curing values 5 Mechanical Properties 1 Shear strength ISO 4587 in N/mm² 5 Thermal properties 4 Product approvals 2
product information
manufacturer Permabond Engineering Adhesives Ltd
brand Permabond
container 20 g, 50 g, 500 g
country of origin Italy
UFI (Unique Formula Identifier) T170-F02F-U00Y-WXY7
Performance at ultimate strength
Impact resistance (ASTM D-950) 3–5 kJ/m²
dielectric strength 25 kV/mm
Physical properties
Color colorless
Chemical group Ethyl cyanoacrylate
Viscosity (adhesives) Medium viscosity 500 - 5000 mPas
Viscosity mPa·s 1200-2500
Specific gravity 1.1
curing values
Maximum gap width (mm) 0.4
Steel strength (sec.) 15-20
Rubber setting time (sec.) 15-20
Hand strength Phenol (sec.) 15-20
ultimate strength 24 hours
Mechanical properties
Hardness (Shore D) 85
Shear strength (ISO 4587) in N/mm²
steel 21-25
ABS >8
polyvinyl chloride >11
PC >5
phenol 14
Thermal Properties
thermal conductivity 0.1 W/(m·K)
thermal expansion coefficient 90 × 10⁻⁶ mm/mm/°C
Operating temperature (°C) -55 to +80
Storage temperature (°C) 2-7
product approvals
WRAS Drinking Water Approval For cold water use only
MIL-A-46050C Type II Class 3 YES

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

Documents and Data Sheets

Click on a document to view a preview, or click the download icon to download it directly.

Technical Data Sheets (TDS) 3
Permabond 240 - Technical Data Sheet (German).pdf
334 KB
Permabond 240 - Technical Data Sheet EN.pdf
373 KB
Permabond 240 - Technical Data Sheet (French).pdf
339 KB
Safety Data Sheets (SDS) 3
Permabond 240 - Safety Data Sheet (German).pdf
431 KB
Permabond 240 - Safety Data Sheet EN.pdf
421 KB
Permabond 240 - Safety Data Sheet (FR).pdf
429 KB

Frequently Asked Questions About Permabond 240

Practical questions regarding application and design — answered by SILITECH.

Permabond 240 (formerly known as Permabond C4) is a high-viscosity cyanoacrylate adhesive (1,200–2,500 mPa·s) with an extended cure time (15–20 seconds to hand-tight on steel). Ideal for: bonding foamed elastomers and foams, large-area components (more adjustment time), bonding plastics with substrate failure (ABS >8, PVC >11, PC >5 N/mm²), as well as applications that must be approved according to MIL-A-46050C Type II Class 3.

Permabond 240 is the current name for the product that was previously sold under the name Permabond C4. The formulation and technical properties remain unchanged—only the product name has been changed to 240 as part of Permabond’s product line standardization. Existing applications with C4 specifications can be switched directly to 240.

Standard cyanoacrylates reach tack on steel in 3–10 seconds—which makes it difficult to align complex components precisely. Permabond 240 is deliberately designed to take 15–20 seconds, allowing users to position the parts with care. This extended open time is crucial for achieving a clean bond, especially with large or complex components or bonds with long butt joints.

Permabond 240 bonds: steel (21–25 N/mm²), aluminum (8–9), zinc (10), plastics with substrate failure — ABS (>8 N/mm² SV), PVC (>11 N/mm² SV), PC (>5 N/mm² SV), phenolic resin (14 N/mm²), Buna-N rubber, and particularly well-foamed elastomers (EPDM foam, foam rubber, PU foams). For PP, PE, PTFE, and silicone, pretreatment with Permabond POP primer is required.

Permabond 240 is high-viscosity (1200–2500 mPa·s), fills large gaps (0.4 mm), has an extended cure time (15–20 s), and is MIL-A-46050C Class 3 approved—the choice for foamed elastomers, large components, and applications requiring more adjustment time. Permabond 102 is medium-viscosity (70–90 mPa·s), faster (10–15 s), and Class 2—the choice for standard bonding applications with smaller gaps and faster processing.

Permabond 240 should be stored unopened in a cool place at 2 to 7 °C. Allow it to warm to room temperature before opening to prevent condensation. When stored properly, opened bottles remain usable for several months. Before using the product in critical production applications, we recommend performing a test bond to check its reactivity.

For foamed elastomers, large components, and MIL-approved applications requiring extended open time, Permabond 240 is the right choice. For micro-gaps/wicking, use Permabond 101. For general-purpose applications with larger gaps, use Permabond 102. For demanding rubber bonding applications, use Permabond 105. For maximum steel strength, use Permabond 910. For vibration- and impact-loaded bonds with double the impact resistance, use Permabond 2050. For drinking water, use 2010; for NSF/food-contact applications, use 2011 Gel.

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product specifications

product information
container 20 g or 50 g or 500 g
manufacturer Permabond Engineering Adhesives Ltd
brand Permabond
country of origin Italy
UFI (Unique Formula Identifier) T170-F02F-U00Y-WXY7
Performance at ultimate strength
Impact resistance (ASTM D-950) 3–5 kJ/m²
dielectric strength 25 kV/mm
Physical properties
Color colorless
Chemical group Ethyl cyanoacrylate
Viscosity (adhesives) Medium viscosity 500 - 5000 mPas
Viscosity mPa·s 1200-2500
Specific gravity 1.1
curing values
Maximum gap width (mm) 0.4
Steel strength (sec.) 15-20
Rubber setting time (sec.) 15-20
Hand strength Phenol (sec.) 15-20
ultimate strength 24 hours
Mechanical properties
Hardness (Shore D) 85
Shear strength (ISO 4587) in N/mm²
steel 21-25
ABS >8
polyvinyl chloride >11
PC >5
phenol 14
Thermal Properties
thermal conductivity 0.1 W/(m·K)
thermal expansion coefficient 90 × 10⁻⁶ mm/mm/°C
Operating temperature (°C) -55 to +80
Storage temperature (°C) 2-7
product approvals
WRAS Drinking Water Approval For cold water use only
MIL-A-46050C Type II Class 3 YES
keywords
keywords
Solvent-free High viscosity Permabond Cyanoacrylate adhesive MIL-A-46050C Type II Class 3

Documents and Data Sheets

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