LOCTITE 542
Harmonization Code : 3403.19 | Lubricating Preparations (With 70% or More Petroleum Oils) For Automotive and Other Uses
Main features
- Low-Viscosity Fine-Thread Sealing
- Anaerobic One-Part Application
- Medium-Strength Serviceable Retention
Product Description
LOCTITE 542 is a brown, low-viscosity one-component anaerobic thread sealant for locking and sealing metal pipes and fittings. The thixotropic liquid remains controlled during application and cures between close-fitting metal threads in the absence of air. Medium-strength retention supports secure assemblies while allowing service with appropriate tools. Properly tightened fittings can seal immediately to moderate pressure, while at least 24 hours is recommended before maximum pressure or solvent resistance is required. The product is suited to fine-threaded metal fittings where a liquid sealant and controlled flow are needed.
Key features
- Low-viscosity thread wetting: A 400 to 800 mPa s Brookfield range supports penetration and coverage on fine metal threads.
- Anaerobic metal-thread cure: The one-part sealant cures between close-fitting metal surfaces without mixing.
- Medium-strength service retention: Measured torque values support locking with later disassembly using appropriate tools.
Applications / Suitable for
- Locking and sealing metal pipes
- Fine-threaded metal fittings
- Assemblies requiring immediate moderate-pressure sealing after tightening
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Thermal Properties
Physical Properties
Additional Information
As-supplied / before-processing properties
Typical values and characteristics for the product before cure, application, or assembly.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Appearance | Brown liquid | - | As supplied |
| Chemical type | Dimethacrylate ester | - | One-component material |
| Specific gravity | 1.06 | - | 25 deg C |
| Viscosity | 1,200 to 2,750 | mPa s | Brookfield RVT, spindle 2, 2.5 rpm, 25 deg C |
| Viscosity | 400 to 800 | mPa s | Brookfield RVT, spindle 2, 20 rpm, 25 deg C |
| Viscosity | 150 | mPa s | EN 12092-MV, 277 s^-1, 25 deg C |
| Flow behavior | Thixotropic | - | As supplied |
| Cure mechanism | Anaerobic | - | Confined between close-fitting metal threads |
After-processing / final-state properties
Typical values for the cured, bonded, treated, or in-service product under the listed conditions.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Breakaway torque | 15 | N m | M10 steel nuts and bolts, cured 24 h at 22 deg C |
| Prevailing torque | 9 | N m | M10 steel nuts and bolts, cured 24 h at 22 deg C |
| Breakloose torque after pretightening | 25 | N m | M10 steel nuts and bolts, pretightened to 5 N m, cured 24 h at 22 deg C |
| Maximum prevailing torque after pretightening | 25 | N m | M10 steel nuts and bolts, pretightened to 5 N m, cured 24 h at 22 deg C |
| Compressive shear strength | >=6.5 | N/mm^2 | Steel pins and collars, cured 24 h at 22 deg C |
| Maximum pressure / solvent-resistance development | 24 | h | Minimum recommended cure after assembly |
