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PERMABOND A131

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Permabond A131 — anaerobic adhesive.

Anaerobic thread sealant paste based on methacrylate — for gas and liquid lines, WRAS approved.

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  • Manufacturer
  • WRAS Drinking Water Approval
  • KIWA Gastec (Gas)
  • KIWA Water (Warm + Cold drinking)
  • KIWA Hydrogen
  • brand
  • Container
  • Color
  • Country of origin
  • Chemical group
  • Viscosity (adhesives)
  • Viscosity 2rpm
  • Viscosity 20rpm
  • fluorescence
  • Maximum gap width (mm)
  • Handling strength (M10 steel)@23°C
  • Functional strength (M10 steel) @ 23°C
  • Final strength (M10 steel) @ 23°C
  • Shear strength (steel ISO10123)
  • coefficient of thermal expansion
  • Dielectric strength
  • Thermal conductivity
  • Storage temperature (°C)
  • Operating temperature (°C)
  • Torsional strength (M10 steel ISO10964) Breakaway strength
  • Torsional strength (M10 steel ISO10964) Further
  • UFI (Unique Formula Identifier)

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Pipe sealing WRAS

 
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: 49-219.FL

HS code: 3506.9190000

Internal reference: 49-219.FL
HS code: 3506.9190000

PERMABOND A131
PERMABOND A131
Permabond · Permabond Engineering Adhesives Ltd · SKU 49-219.FL

Permabond A131 is a premium methacrylate ester-based thread sealant — one of the world's most comprehensive anaerobic approvals with KIWA Gas, KIWA Hot/Cold Water, KIWA Hydrogen, and WRAS Drinking Water. The universal choice for demanding building services engineering.

Unlike conventional acrylic anaerobic sealants, A131 utilizes methacrylate ester chemistry and was specifically developed for use as a multi-media thread sealant. Its white paste consistency does not drip from vertical threads.

KIWA certification covers gas (Gastec), drinking water (both hot and cold), and hydrogen (H₂) — a combination unmatched by any other anaerobic thread sealant at this depth. The additional WRAS approval allows for use with drinking water up to 85 °C. Medium torque values ​​(breakaway 10 N·m, further 7 N·m) permit subsequent disassembly for maintenance — important in utility and plant engineering.

PREMIUM LICENSES

One of the world's most comprehensive anaerobic approvals — KIWA Gastec (gas), KIWA Water (hot and cold drinking water), KIWA Hydrogen (hydrogen), plus WRAS for drinking water up to 85 °C. Permabond A131 is the premium choice for multi-media fittings in building services engineering.

Permabond A131 in figures
KIWA
Gas + Water + H₂
WRAS
Drinking water 85 °C
Hydrogen
H₂-approved
Methacrylate
Specialty chemicals

What distinguishes Permabond A131

KIWA Gastec Gas Approval
Certified for natural gas fittings in supply systems.
KIWA Water warm + cold
Drinking water approval for hot water systems.
KIWA Hydrogen (H₂)
Exceptional approval for hydrogen screw connections — relevant to the energy transition.
WRAS drinking water up to 85 °C
British standard for hot and cold drinking water.
Methacrylate specialty chemicals
Optimized for multi-media pipe sealant applications.
Paste consistency / 0.5 mm
Does not drip, fills rough pipe thread tolerances.

What is Permabond A131 used for?

Hydrogen supply systems
KIWA Hydrogen-certified — fuel cells, H₂ distribution, energy transition infrastructure.
Gas connections to houses
KIWA Gastec — Natural gas supply lines with safety requirements.
Hot and cold drinking water systems
KIWA + WRAS — Heating and sanitary systems.
Maintainable pipe seal
Removable — periodic service interventions possible.
Multimedia provision
When an adhesive is required for gas/water/H₂ mixing applications.

processing

1
Clean surfaces
Bonding surfaces must be clean, dry, and free of grease. Degrease with Permabond Cleaner A or a solvent (acetone, isopropanol). Rough surfaces (~25 µm) result in higher bond strength than polished surfaces.
2
Apply adhesive
Apply Permabond A131 directly from the bottle — for through holes, apply a stripe along the thread length; for blind holes, apply a few drops to the bottom. Do not touch the tip to metal surfaces (this will cause premature hardening in the bottle).
3
assembling components
Insert the screws and tighten them to the required torque. For shaft-hub fits, assemble the components before the adhesive begins to cure.
4
Allow to harden
Anaerobic curing begins in the absence of air and in contact with metal. Handling strength is typically achieved after 15 minutes, functional strength after 1 hour, and full strength after 24 hours at 23 °C.
5
Accelerate curing (optional)
Permabond A905 activator can be used on inactive surfaces (stainless steel, zinc, aluminum) or at low temperatures — applied to one adhesive surface, allowed to evaporate, then adhesive applied to the other side.
Data sheets & safety data sheet
Full TDS and SDS in DE, EN, FR — view or download directly.
To the documents →

Recommended accessories

Permabond A905 Activator
Accelerates anaerobic curing on inactive surfaces such as stainless steel, zinc or aluminum and improves gap curing.
View product →
Permabond A 905 Spray
Aerosol version of the A905 activator — convenient application in inaccessible places or large areas.
View product →
Permabond Cleaner A Aerosol
Spray cleaner for quick degreasing and preparation of the bonding surfaces before applying the anaerobic adhesive.
View product →
Permabond A118 High Strength Universal
High-strength all-round bonding — the universal choice for demanding screw, bearing and shaft-hub connections.
View product →

Important instructions

Not suitable for / Important notes
Not for use in pure oxygen or vapor environments. Methacrylate chemistry — test compatibility with substrates before series production. Use A905 activator on inactive surfaces.
storage
Store at 5 to 25 °C. Anaerobic adhesives lose their reactivity upon contact with metal — do not touch the tip of the bottle to metal surfaces, do not pour the adhesive back into the bottle.

Which Permabond anaerobic adhesive is suitable for which application?

Permabond A131 in direct comparison with related products of the A series.

Permabond A131
Current product		Permabond A129 →Permabond A118 →Permabond LH050 →
Application / StrengthPremium methacrylate thread seal — for gas, drinking water, hydrogenAcrylic chemistry instead of methacrylateHigh pressure burst-proofLow-strength methacrylate paste
viscosityPaste consistency (thixotropic)gel300,000 mPa·s250,000 mPa·s
Maximum gap filling.0.5 mm0.5 mm0.5 mm0.5 mm
Breakaway torque10 N·m12 N·m58 N·m4 N·m
Further torque7 N·m7 N·m6 N·m33 N·m
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
Pipe sealing WRAS

Technical data for PERMABOND A131

All 27 product information 5 Performance at final strength 5 Physical properties 6 Curing values ​​4 Product approvals 4 Thermal properties 3
Product information
Manufacturer Permabond Engineering Adhesives Ltd
brand Permabond
Container 50 ml, 200 ml, 1 l
Country of origin Italy
UFI (Unique Formula Identifier) WSJ0-Q0C3-400U-KMT9
Performance at final strength
Shear strength (steel ISO10123) 12 MPa
Dielectric strength 11 kV/mm
Thermal conductivity 0.19 W/(mK)
Torsional strength (M10 steel ISO10964) Breakaway strength 10 Nm
Torsional strength (M10 steel ISO10964) Further 7 Nm
Physical properties
Color white
Chemical group Methacrylate esters
Viscosity (adhesives) High viscosity >5000 mPas
Viscosity 2rpm 40000
Viscosity 20rpm 6000
fluorescence Yes
Curing values
Maximum gap width (mm) 0.5
Handling strength (M10 steel)@23°C 45 minutes
Functional strength (M10 steel) @ 23°C 2 hours
Final strength (M10 steel) @ 23°C 24 hours
Product approvals
WRAS Drinking Water Approval warm + cold (up to 85 °C)
KIWA Gastec (Gas) Yes
KIWA Water (Warm + Cold drinking) Yes
KIWA Hydrogen Yes
Thermal properties
coefficient of thermal expansion 90 x 10-6 mm/mm/°C
Storage temperature (°C) 5-25
Operating temperature (°C) -55 to 150

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 A131 - Technical Data Sheet DE.pdf
325 KB
Permabond A131 - Technical Data Sheet EN.pdf
329 KB
Permabond A131 - Fiche Technique FR.pdf
286 KB
Safety Data Sheets (SDS) 3
Permabond A131 - Safety Data Sheet DE.pdf
406 KB
Permabond A131 - Safety Data Sheet EN.pdf
385 KB
Permabond A131 - Fiche de Sécurité FR.pdf
388 KB

Frequently asked questions about Permabond A131

Practical application and design questions — answered by SILITECH.

Permabond A131 is a methacrylate ester (anaerobic) with a paste consistency (thixotropic) and a viscosity suitable for gaps up to 0.5 mm. It is a premium thread sealant with multi-approval certifications – KIWA Gas + Hot/Cold Drinking Water + Hydrogen + WRAS. Anaerobic adhesives cure in the absence of air and in contact with metal – ideal for tight-tolerance metallic joints.

Anaerobic adhesives like Permabond A131 remain liquid in the bottle (due to contact with air and oxygen) and only begin to harden after bonding under anaerobic conditions and metal-to-metal contact. Curing starts at the metal surface and progresses into the bond gap. The product cures quickly on steel and copper; on stainless steel and zinc, the Permabond A905 activator may be beneficial.

Yes — Permabond A131 is a thread sealant with moderate torque (10 N·m) and can be removed with standard tools. Designed for maintenance of pipe connections.

Permabond A131 is approved according to KIWA Gastec (Gas), KIWA Water (Warm & Cold drinking), KIWA Hydrogen, and WRAS Drinking Water Approval (hot and cold up to 85 °C) . These certifications qualify the product for the respective specified applications—such as direct contact with drinking water in the case of WRAS and KTW approvals.

Permabond A131 typically reaches handling strength after 15 minutes and functional strength after 1 hour at 23 °C on M10 steel. Final strength is reached after 24 hours. On inactive surfaces (stainless steel, zinc) or at low temperatures, the curing time is extended—Permabond A905 activator accelerates the process.

Permabond A131 is a premium methacrylate thread sealant for use with gas, drinking water, and hydrogen (paste consistency (thixotropic), 0.5 mm gap filling, 10 N·m breakaway torque). Permabond A129 is a medium-strength gel (gel, 0.5 mm, 12 N·m breakaway torque) using acrylic chemistry instead of methacrylate. Both belong to the anaerobic Permabond A series.

The choice depends on the application: Permabond A131 (premium thread sealant methacrylate — gas, drinking water, hydrogen); Permabond A129 (medium strength gel); Permabond A1058 (high viscosity paste); Permabond LH050 (low strength paste). For inactive surfaces (stainless steel, zinc, aluminum), Permabond A905 activator be used to accelerate curing.

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Product specifications

Product information
Container 50 ml or 200 ml or 1 l
Manufacturer Permabond Engineering Adhesives Ltd
brand Permabond
Country of origin Italy
UFI (Unique Formula Identifier) WSJ0-Q0C3-400U-KMT9
Performance at final strength
Shear strength (steel ISO10123) 12 MPa
Dielectric strength 11 kV/mm
Thermal conductivity 0.19 W/(mK)
Torsional strength (M10 steel ISO10964) Breakaway strength 10 Nm
Torsional strength (M10 steel ISO10964) Further 7 Nm
Physical properties
Color white
Chemical group Methacrylate esters
Viscosity (adhesives) High viscosity >5000 mPas
Viscosity 2rpm 40000
Viscosity 20rpm 6000
fluorescence Yes
Curing values
Maximum gap width (mm) 0.5
Handling strength (M10 steel)@23°C 45 minutes
Functional strength (M10 steel) @ 23°C 2 hours
Final strength (M10 steel) @ 23°C 24 hours
Product approvals
WRAS Drinking Water Approval warm + cold (up to 85 °C)
KIWA Gastec (Gas) Yes
KIWA Water (Warm + Cold drinking) Yes
KIWA Hydrogen Yes
Thermal properties
coefficient of thermal expansion 90 x 10-6 mm/mm/°C
Storage temperature (°C) 5-25
Operating temperature (°C) -55 to 150
Keywords
Keywords
Pipe sealing WRAS

Documents and datasheets

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