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PERMABOND 791

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Superglue, ultra-low viscosity, MIL-A-46050C Class 1

MIL-A-46050C Class 1 approved — the Wicking adhesive for micro gaps and post-production precision fixing.

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  • Viscosity (adhesives)
  • Viscosity mPa·s
  • Maximum gap width (mm)
  • Steel hand strength (sec.)
  • Rubber's hand strength (sec.)
  • Hand strength of phenol (seconds)
  • Steel
  • ABS
  • PVC
  • Shear strength polycarbonate
  • Operating temperature (°C)
  • Hardness (Shore D)
  • Storage temperature (°C)
  • Final strength
  • Dielectric strength
  • Tensile strength
  • UFI (Unique Formula Identifier)

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Cyanoacrylate Ethyl cyanoacrylate Rubber Plastic Leather Low viscosity Steel Paper Cardboard MIL-A-46050C Type II Class 1 CID AA-3097 Type II Class 1 Industrial adhesive PERMABOND Superglue PERMABOND 791

 
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: 49-791.FL

HS code: 3506.9190000

Internal reference: 49-791.FL
HS code: 3506.9190000

PERMABOND 791
PERMABOND 791
Permabond · Permabond Engineering Adhesives Ltd · SKU 49-791.FL

Permabond 791 is an ultra-low viscosity ethyl cyanoacrylate adhesive optimized for wicking applications, micro gaps and the subsequent bonding of pre-joined precision components — qualified to MIL-A-46050C Class 1.

With a viscosity of 15–50 mPa·s, 791 is in the ultra-low viscosity range. The liquid penetrates micro-gaps and already assembled components via capillary action—a process known as wicking—and hardens to hand strength within 2 to 3 seconds.

The MIL-A-46050C Class 1 approval qualifies 791 for industrial, aerospace, and defense applications. On ABS, PVC, and polycarbonate, the break test results in substrate failure—the bond is stronger than the substrate. The maximum gap filling of 0.1 mm is designed for tight tolerance fits.

PERMIT

MIL-A-46050C Type II Class 1 (existing designs) & CID AA-3097 Type II Class 1 (new designs) — the most important international specification for cyanoacrylate industrial adhesives. Qualified for industrial, aerospace, and defense applications.

Permabond 791 in numbers
15–50
mPa·s viscosity
2–3 s
Firmly on steel
18–22
N/mm² steel
MIL
A-46050C Class 1

What distinguishes Permabond 791

Ultra-low viscosity
15–50 mPa·s — flows through capillary action into micro-gaps and already assembled components.
MIL-A-46050C Class 1 approved
Top-tier specification for industrial, aerospace and defense technology.
Instant hand strength
2–3 seconds on steel, Buna-N rubber and phenolic resin.
Substrate failure in ABS, PVC, PC
For PVC, the bond is stronger than the plastic substrate even at 10 N/mm².
Wicking application
Adhesive flows into joined components afterwards — no disassembly is necessary.
Tight tolerances
0.1 mm gap filling — designed for precision bonding without a visible adhesive seam.

What is Permabond 791 used for?

Wicking applications
The adhesive penetrates already assembled components through capillary action — subsequent fixing without disassembly.
Precision components
Very tight tolerance fits with gap widths down to 0.1 mm — micromechanics, precision engineering, electronics.
Penetration into porous materials
Wood, cardboard, leather and paper — standard capillary application.
Defense and aviation technology
MIL-A-46050C Class 1 approved — qualified for demanding industrial environments.
High-speed manufacturing
2–3 seconds of hand strength — suitable for line production with short cycle times.

processing

1
Clean surfaces
Bonding surfaces must be clean, dry, and free of grease. Degrease with acetone or isopropanol. Lightly sand aluminum, copper, and their alloys to remove the oxide layer.
2
Use adhesive sparingly
Apply Permabond 791 only drop by drop to a bonding surface — the thin layer is crucial for rapid curing.
3
assembling components
Quickly and correctly align the parts. Apply enough pressure so that the adhesive spreads into a thin film.
4
Secure until firmly in place
Do not disturb or realign until handling strength is reached (typically a few seconds to one minute, depending on the substrate). Final strength is reached after 24 hours.
5
Remove adhesive residue
Excess adhesive can be removed with Permabond CA Solvent 2, nitromethane or acetone.
Data sheets & safety data sheet
Full TDS and SDS in DE, EN, FR — view or download directly.
To the documents →

Recommended accessories

Permabond Activator CSA
Accelerates curing and enables bonding on porous or acidic surfaces.
View product →
Permabond POP Primer
Polyolefin primer for the pretreatment of PP, PE, PTFE and silicone — without a primer, reliable cyanoacrylate bonding is not possible on these materials.
View product →
Permabond Cleaner A Aerosol
Spray cleaner for quick degreasing and preparation of the bonding surfaces before applying cyanoacrylate.
View product →
Permabond CA Solvent 2
Special solvent for removing hardened cyanoacrylate adhesive residue — gentler than acetone or nitromethane.
View product →

Important instructions

Not suitable for / Important notes
For porous or difficult surfaces, Permabond CSA activator is recommended. Permabond POP primer is mandatory before bonding PP, PE, PTFE, or silicone. Lightly sand aluminum and copper to remove the oxide layer.
storage
Store refrigerated at 2 to 7 °C. Allow the bottle to warm to room temperature before opening – this prevents condensation and protects the shelf life.

Which Permabond is suitable for which application?

Permabond 791 in direct comparison with related cyanoacrylate products.

Permabond 791
Current product		Permabond 792 →Permabond 712 →Permabond 801 →
ChemistryEthyl cyanoacrylateEthyl-CAEthyl-CAEthyl-CA
viscosity15-50 mPa·s60–125 mPa·s100 mPa·s10–15 mPa·s
Maximum gap filling.0.1 mm0.15 mm0.15 mm0.05 mm
Firmly on steel2–3 s2–3 s25 s10–15 s
Shear strength steel18-22 N/mm²18-22 N/mm²19–24 N/mm²19–23 N/mm²
Strength / Recommended forClass 1 approved
MIL		MIL Class 2 + NSF StandardHot/Wet, 120 °CHigh temperature
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
Cyanoacrylate Ethyl cyanoacrylate Rubber Plastic Leather Low viscosity Steel Paper Cardboard MIL-A-46050C Type II Class 1 CID AA-3097 Type II Class 1 Industrial adhesive PERMABOND Superglue PERMABOND 791

Technical data for PERMABOND 791

All 23 product information 6 Performance at final strength 2 Physical properties 4 Curing values ​​5 Mechanical properties 1 Shear strength ISO 4587 in N/mm² 3 Thermal properties 2
Product information
Manufacturer Permabond Engineering Adhesives Ltd
brand Permabond
Container 20 g, 50 g, 500 g
Country of origin Italy
Tensile strength >20 N/mm²
UFI (Unique Formula Identifier) Y5H0-3'7J-A00F-14R2
Performance at final strength
Shear strength polycarbonate >6
Dielectric strength 25 kV/mm
Physical properties
Color colorless
Chemical group Ethyl cyanoacrylate
Viscosity (adhesives) Low viscosity <500 MPas
Viscosity mPa·s 15-50
Curing values
Maximum gap width (mm) 0.1
Steel hand strength (sec.) 2-3
Rubber's hand strength (sec.) 2-3
Hand strength of phenol (seconds) 2-3
Final strength 24 hours
Mechanical properties
Hardness (Shore D) 85
Shear strength ISO 4587 in N/mm²
Steel 18-22
ABS >6
PVC >10
Thermal properties
Operating temperature (°C) -55 to +80
Storage temperature (°C) 2-7

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
Permabond 791 - Technical Data Sheet DE.pdf
334 KB
Permabond 791 - Technical Data Sheet EN.pdf
375 KB
Permabond 791 - Fiche Technique FR.pdf
340 KB
Safety Data Sheets (SDS) 3
Permabond 791 - Safety Data Sheet DE.pdf
335 KB
Permabond 791 - Safety Data Sheet EN.pdf
312 KB
Permabond 791 - Fiche de Sécurité FR.pdf
334 KB

Frequently asked questions about Permabond 791

Practical application and design questions — answered by SILITECH.

Permabond 791 is an ethyl cyanoacrylate instant adhesive with a viscosity of 15–50 mPa·s and a maximum gap filling of 0.1 mm. Ultra-low viscosity cyanoacrylate adhesive — MIL-A-46050C Class 1, wicking-capable.

Permabond 791 reliably bonds steel (18–22 N/mm²), ABS (>6 N/mm² (substrate failure)), PVC (>10 N/mm² (substrate failure)), polycarbonate (>6 N/mm² (substrate failure)), as well as Buna-N rubber and similar elastomers. For polypropylene (PP), polyethylene (PE), PTFE, and silicone, pretreatment with Permabond Polyolefin Primer (POP) is required.

Permabond 791 is approved according to MIL-A-46050C Type II Class 1 (existing designs), CID AA-3097 Type II Class 1 (new designs) — qualified for demanding industrial applications.

Permabond 791 reaches handling strength on steel in 2–3 seconds. Other typical curing times: 2–3 seconds (Buna N), 2–3 seconds (phenol). The final strength of 18–22 N/mm² (steel) is reached after 24 hours. Temperature, humidity, and substrate affect the curing rate.

Permabond 791 offers a viscosity of 15–50 mPa·s, 0.1 mm gap filling, and 18–22 N/mm² shear strength on steel. Permabond 792 has a viscosity of 60–125 mPa·s, 0.15 mm gap filling, and 18–22 N/mm² shear strength on steel (MIL Class 2 + NSF, standard). Both utilize an ethyl cyanoacrylate base (or a related cyanoacrylate variant).

Permabond 791 should be stored unopened at 2 to 7 °C and is stable until the printed expiration date. Allow the bottle to warm to room temperature before opening—this prevents condensation inside, which would reduce its shelf life. Opened bottles remain functional for several months if stored correctly, although the curing rate may decrease over time. We recommend a test bond to check reactivity before critical production applications.

From the Permabond cyanoacrylate range, select according to viscosity and special properties: Permabond 791 (15–50 mPa·s, 0.1 mm gap width, Class 1 approved); Permabond 792 (60–125 mPa·s, 0.15 mm, MIL Class 2 + NSF, standard); Permabond 712 (100 mPa·s, 0.15 mm, hot/wet, 120 °C); Permabond 801 (10–15 mPa·s, 0.05 mm, high temperature). For polypropylene, polyethylene, PTFE, and silicone, pretreatment with Permabond Polyolefin Primer (POP) is always required.

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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
Tensile strength >20 N/mm²
UFI (Unique Formula Identifier) Y5H0-3'7J-A00F-14R2
Performance at final strength
Shear strength polycarbonate >6
Dielectric strength 25 kV/mm
Physical properties
Color colorless
Chemical group Ethyl cyanoacrylate
Viscosity (adhesives) Low viscosity <500 MPas
Viscosity mPa·s 15-50
Curing values
Maximum gap width (mm) 0.1
Steel hand strength (sec.) 2-3
Rubber's hand strength (sec.) 2-3
Hand strength of phenol (seconds) 2-3
Final strength 24 hours
Mechanical properties
Hardness (Shore D) 85
Shear strength ISO 4587 in N/mm²
Steel 18-22
ABS >6
PVC >10
Thermal properties
Operating temperature (°C) -55 to +80
Storage temperature (°C) 2-7
Keywords
Keywords
Cyanoacrylate Ethyl cyanoacrylate Rubber Plastic Leather Low viscosity Steel Paper Cardboard MIL-A-46050C Type II Class 1 CID AA-3097 Type II Class 1 Industrial adhesive PERMABOND Superglue PERMABOND 791

Documents and datasheets

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