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PERMABOND A025
Anaerobic threadlocker, high strength, high temperature resistant
High-strength, high-temperature screw locking device with WRAS drinking water approval.
Documents
Internal reference:
49-210.FL
HS code:
3506.9190000
Permabond A025 is a high-strength, high-temperature resistant anaerobic threadlocker with WRAS drinking water approval — designed for permanent bolted connections in hot or chemically exposed environments.
With a viscosity of 750 mPa·s and a gap filling capacity of 0.2 mm, A025 also covers coarse tolerances. The orange color indicates the high-strength classification — disassembly usually requires heating the joint.
The outstanding temperature resistance sets A025 apart from standard threadlockers: While ordinary anaerobic threadlockers lose strength at around 150 °C, A025 lasts significantly longer. Its excellent chemical resistance qualifies the product for use in systems containing solvents, oils, and aggressive media. It also holds WRAS approval for contact with drinking water.
High-temperature resistance + WRAS drinking water approval — the rare combination of a high-strength threadlocker with extended temperature reserve and drinking water approval. Excellent chemical resistance for demanding industrial environments.
What distinguishes Permabond A025
What is Permabond A025 used for?
processing
Recommended accessories
Important instructions
Which Permabond anaerobic adhesive is suitable for which application?
Permabond A025 in direct comparison with related products of the A series.
Permabond A025 Current product | Permabond A130 → | Permabond A134 → | Permabond A118 → | |
|---|---|---|---|---|
| Application / Strength | High-strength, high-temperature threadlocker | Medium-strength, WRAS+KTW | Maximum strength, gap 0.5 mm | Highest torque, WRAS |
| viscosity | 750 mPa·s | 1,800 mPa·s | paste | 400 mPa·s |
| Maximum gap filling. | 0.2 mm | 0.12 mm | 0.5 mm | 0.12 mm |
| Breakaway torque | 13 N·m | 12 N·m | 30 N·m | 33 N·m |
| Further torque | 23 N·m | 7 N·m | 50 N·m | 58 N·m |
Technical data for PERMABOND A025
| Product information | |
|---|---|
| Manufacturer | Permabond Engineering Adhesives Ltd |
| brand | Permabond |
| Container | 50 g, 200 g |
| Country of origin | Italy |
| Performance at final strength | |
|---|---|
| Shear strength (steel ISO10123) | 8 MPa |
| Dielectric strength | 11 kV/mm |
| Thermal conductivity | 0.19 W/(mK) |
| Physical properties | |
|---|---|
| Color | orange |
| Chemical group | Acrylic Unicomponent |
| Viscosity (adhesives) | Medium viscosity 500 - 5000 mPas |
| Viscosity mPa·s | 750 |
| fluorescence | Yes |
| Curing values | |
|---|---|
| Maximum gap width (mm) | 0.2 |
| Handling strength (M10 steel)@23°C | 15-30 minutes |
| Functional strength (M10 steel) @ 23°C | 2 hours |
| Final strength (M10 steel) @ 23°C | 24 hours |
| 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) 4
Frequently asked questions about Permabond A025
Practical application and design questions — answered by SILITECH.
Permabond A025 is a single-component (anaerobic) acrylic adhesive with a viscosity of 750 mPa·s and a gap-filling capacity of up to 0.2 mm. It is a high-strength, high-temperature threadlocker approved for use in drinking water environments up to 200 °C. Anaerobic adhesives cure in the absence of air and in contact with metal – ideal for tight-tolerance metallic joints.
Anaerobic adhesives like Permabond A025 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.
Difficult to remove — Permabond A025 is high-strength (13 N·m breakaway torque). Disassembly typically requires heating the bond to 200 °C or more. Designed for permanent bonding.
Permabond A025 is approved according to WRAS drinking water regulations . These certifications qualify the product for the specified applications — such as direct contact with drinking water in the case of WRAS and KTW approvals.
Permabond A025 typically achieves 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 A025 is a high-strength, high-temperature threadlocker (750 mPa·s viscosity, 0.2 mm gap filling, 13 N·m breakaway torque). Permabond A130 is a medium-strength WRAS (1,800 mPa·s, 0.12 mm gap filling, 12 N·m breakaway torque) — medium-strength, WRAS+KTW. Both belong to the anaerobic Permabond A series.
The choice depends on the application: Permabond A025 (high-strength, high-temperature threadlocker); Permabond A130 (medium-strength WRAS); Permabond A134 (high-strength standard); Permabond A118 (high-strength universal). 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 g or 200 g |
| Manufacturer | Permabond Engineering Adhesives Ltd |
| brand | Permabond |
| Country of origin | Italy |
| Performance at final strength | |
|---|---|
| Shear strength (steel ISO10123) | 8 MPa |
| Dielectric strength | 11 kV/mm |
| Thermal conductivity | 0.19 W/(mK) |
| Physical properties | |
|---|---|
| Color | orange |
| Chemical group | Acrylic Unicomponent |
| Viscosity (adhesives) | Medium viscosity 500 - 5000 mPas |
| Viscosity mPa·s | 750 |
| fluorescence | Yes |
| Curing values | |
|---|---|
| Maximum gap width (mm) | 0.2 |
| Handling strength (M10 steel)@23°C | 15-30 minutes |
| Functional strength (M10 steel) @ 23°C | 2 hours |
| Final strength (M10 steel) @ 23°C | 24 hours |
| 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 | |
Documents and datasheets
Safety Data Sheets (SDS) and Technical Data Sheets (TDS) are available for download:
- Permabond A025 - Technical Data Sheet FR.pdf (304 KB)
- Permabond A025 - Fiche de Sécurité FR.pdf (347 KB)
- Permabond A025 - Safety Data Sheet EN.pdf (344 KB)
- Permabond A025 - Safety Data Sheet DE.pdf (348 KB)
- Permabond A025 - Technical Data Sheet EN.pdf (336 KB)
- Permabond A025 - Technical Data Sheet DE.pdf (333 KB)
- Permabond A025 - Technical Data Sheet DE.pdf (333 KB)