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PERMABOND LH050

PERMABOND LH050

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Low-strength anaerobic threadlocker, removable with tools

Low-strength thread sealing paste — tool-removable sealing of large pipe threads up to M56.

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  • Torsional strength (M10 steel ISO10964) Breakaway strength
  • Torsional strength (M10 steel ISO10964) Further
  • Chemical group
  • Specific gravity
  • Viscosity (adhesives)
  • fluorescence
  • Maximum gap width (mm)
  • Color
  • Container
  • UFI (Unique Formula Identifier)
  • Storage temperature (°C)

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PERMABOND

 
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: 49-204.FL

HS code: 3506.9190000

Internal reference: 49-204.FL
HS code: 3506.9190000

PERMABOND LH050
PERMABOND LH050
Permabond · Permabond Engineering Adhesives Ltd · SKU 49-204.FL

Permabond LH050 is a low-strength anaerobic thread sealant in paste form — designed for pressure-tight sealing of pipe threads up to M56, which must remain removable at all times for service and inspection purposes.

With a paste consistency of 250,000 mPa·s, LH050 does not drip, remains precisely in place, and fills gaps up to 0.5 mm. Its methacrylate chemistry distinguishes it from classic acrylic anaerobic wipes of the A-series.

The low torque of 4 N·m breakaway and 3 N·m further tightening makes the LH050 the ideal choice for maintenance and service fittings — the connection seals reliably but can be loosened at any time without tools or with minimal tool use. The range up to M56 also covers large industrial pipe threads.

APPLICATION PROFILE

Low-strength, methacrylate-based thread sealant paste — seals pipe threads up to M56 pressure-tight and remains removable with standard tools. Ideal for service fittings, inspection connections, and similar maintenance applications.

Permabond LH050 in figures
paste
Doesn't drip
M56
max. thread
4 N·m
Solvable by hand
0.5 mm
Gap filling

What distinguishes Permabond LH050

Low-strength thread sealant
4 N·m breakaway torque — can be released at any time.
paste consistency
Does not drip — apply precisely, in one spot.
Threads up to M56
Seal even large pipe threads.
Methacrylate specialty chemicals
Unlike classic acrylic anaerobics.
Pressure seal
Seals pipe threads against liquids and gases.
Corrosion protection
Seals the thread gaps against moisture.

What is Permabond LH050 used for?

Service fittings
Threads that are regularly opened for maintenance purposes.
Inspection fittings
Pressure seal with a connection that can be released at any time.
Plumbing maintenance
If tightly fitting pipe sealants were too difficult to remove.
Hydraulics/Pneumatics Service
Screw connections for regular service interventions.
Repair adhesives
Paste application with maintenance solubility.

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 LH050 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 nozzle to metal surfaces (this will cause premature hardening in the bottle).
3
Joining 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

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 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 contact with oxygen or vapor. For inactive surfaces, use A905 activator. Methacrylate chemistry — test compatibility with substrates before series production.
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 LH050 in direct comparison with related products of the A-series.

Permabond LH050
Current product		Permabond A129 →Permabond A1044 →Permabond MH052 →
Application / StrengthLow-strength thread sealant (paste)Medium-strength A-seriesInstant sealing, higher strengthDual function with ambulance and water rescue system
viscosity250,000 mPa·s (paste)gelThixotropic65,000 mPa·s
Maximum gap filling.0.5 mm0.5 mm0.5 mm0.5 mm
Breakaway torque4 N·m12 N·m20 N·m20 N·m
Further torque3 N·m7 N·m10 N·m11 N·m
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
PERMABOND

Technical data for PERMABOND LH050

All 14 product information 5 Performance at final strength 2 Physical properties 4 Curing values ​​1 Thermal properties 1 General 1
Product information
brand Permabond
Manufacturer Permabond Engineering Adhesives Ltd
Country of origin Italy
Container 50 ml, 250 ml
UFI (Unique Formula Identifier) P911-8005-W00G-DA96
Performance at final strength
Torsional strength (M10 steel ISO10964) Breakaway strength 4 N·m
Torsional strength (M10 steel ISO10964) Further 3 N·m
Physical properties
Chemical group Methacrylate esters
Specific gravity 1,1
Viscosity (adhesives) High viscosity / paste
fluorescence Yes
Curing values
Maximum gap width (mm) 0,5
Thermal properties
Storage temperature (°C) 5-25
Generally
Color white

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 LH050 - Technical Data Sheet EN.pdf
351 KB

Frequently asked questions about Permabond LH050

Practical application and design questions — answered by SILITECH.

Permabond LH050 is an anaerobic methacrylate ester with a viscosity of 250,000 mPa·s (paste) and gap filling capability up to 0.5 mm. This low-strength thread sealant paste provides tool-removable sealing for large pipe threads up to M56. Anaerobic adhesives cure in the absence of air and in contact with metal—ideal for tight-tolerance metallic joints.

Anaerobic adhesives like Permabond LH050 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 LH050 is a low-strength threadlocker (4 N·m breakaway torque) and can be loosened at any time with standard tools without heating. Designed for maintenance and service.

Permabond LH050 does not have specific industry approvals such as WRAS or KTW (drinking water). For general industrial applications, the product is approved according to Permabond's internal specifications; however, product-specific testing prior to series production is recommended.

Permabond LH050 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 LH050 is a low-strength thread sealant (paste) (250,000 mPa·s (paste) viscosity, 0.5 mm gap filling, 4 N·m breakaway torque). Permabond A129 is a medium-strength gel (gel, 0.5 mm, 12 N·m breakaway torque) — Medium-strength A series. Both belong to the anaerobic Permabond A series.

The choice depends on the application: Permabond LH050 (low-strength thread sealant (paste)); Permabond A129 (medium-strength gel); Permabond A1044 (fast-curing); Permabond MH052 (threadlocker + sealant). 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 250 ml
brand Permabond
Manufacturer Permabond Engineering Adhesives Ltd
Country of origin Italy
UFI (Unique Formula Identifier) P911-8005-W00G-DA96
Performance at final strength
Torsional strength (M10 steel ISO10964) Breakaway strength 4 N·m
Torsional strength (M10 steel ISO10964) Further 3 N·m
Physical properties
Chemical group Methacrylate esters
Specific gravity 1,1
Viscosity (adhesives) High viscosity / paste
fluorescence Yes
Curing values
Maximum gap width (mm) 0,5
Thermal properties
Storage temperature (°C) 5-25
Uncategorized
Color white
Keywords
Keywords
PERMABOND

Documents and datasheets

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