Loctite 232000 573 slow cure FIPG sealant is a precision anaerobic adhesive designed for machined surfaces and rigid assemblies. This low-flow, gap-filling sealant cures in the absence of air to deliver high bond strength and excellent chemical resistance in demanding industrial environments.
Formulated for threaded and through-hole retaining, as well as cylindrical shaft bonding, Loctite 232000 573 provides controlled cure kinetics that reduce shrinkage and stress in critical joints.
Key Specification Overview
| Parameter | Value | Test Method | Notes |
|---|---|---|---|
| Chemical Type | Anaerobic sealant | Internal | Gap-filling, low-flow |
| Cure Mechanism | Anaerobic curing | ASTM D5364 | Requires metal ions and air exclusion |
| Operational Temperature | -54 to 149°C | - | Service temperature range |
| Tensile Strength | ≥25 MPa | ASTM D1002 | Bonded steel specimens |
| Viscosity (Uncured) | 600–900 mPa·s | Brookfield | Low flow for precision applications |
| Shelf Life | 12 months | - | Storage in cool, dry conditions |
| Fluid Resistance | Good against fuels and mild chemicals | - | Suitable for many hydraulic assemblies |
Slow Cure Behavior on Machined Surfaces
Controlled Cure Kinetics
Loctite 232000 573 provides a slow, manageable cure window that aligns with automated dispensing and assembly lines. The delayed set reduces the risk of premature locking and allows precise part positioning on machined pins and housings.
Bonding to Rigid Metals
On stainless steel, carbon steel, and aluminum substrates, this sealant develops high shear and tensile strength along machined bores and shoulders. Proper surface preparation and metal ionization enable uniform stress distribution across the joint.
Thread Retention and Sealing Performance
Threadlocking and Prevents Loosening
When applied to tapped holes and bolts, Loctite 232000 573 resists vibration-induced loosening while maintaining serviceability for maintenance. The sealant fills micro-gaps, improving clamp load consistency in machined threaded assemblies.
Pressure and Leak Resistance
In hydraulic and pneumatic cartridges, the sealant helps prevent micro-leakage along cylindrical sleeves and sealing surfaces. Its low-flow, gap-filling action conforms to turned or ground finishes without requiring heavy bead application.
Application and Process Guidelines
Surface Preparation and Dispensing
For reliable cure on machined components, clean surfaces to remove cutting fluids and particulate using a suitable solvent wipe. Use needle-dispense tools with controlled flow to place the low-viscosity fluid in holes, grooves, or onto fastener threads without excess squeeze-out.
Curing and Handling Times
Handling strength is typically reached within 15–30 minutes, with full mechanical development over 24 hours at 23°C. Accelerated cure can be achieved with elevated temperature and airflow, provided process validation confirms dimensional stability of machined features.
Operational Best Practices and Recommendations
- Verify metal compatibility and surface cleanliness before dispensing to ensure consistent curing and bond strength.
- Calibrate metered dispensing equipment to match the slow cure profile and avoid thick beads that slow down cure.
- Validate cure schedules at actual production temperatures, especially for heat-sensitive substrates.
- Use thread protection methods when temporary disassembly is required to prevent over-curing in critical features.
- Document process parameters such as dwell time, temperature, and airflow to maintain repeatability on machined assemblies.
FAQ
Reader questions
Is Loctite 232000 573 suitable for automated dispensing on CNC-machined parts?
Yes, its low-flow, slow-cure characteristics allow precise needle placement and reduce sag on vertical or complex machined geometries.
How does this sealant perform in assemblies with close-tolerance bores?
The controlled flow and minimal shrinkage help maintain bore geometry, making it well suited for precision machined cylinders and bushings.
Can Loctite 232000 573 be used in hydraulic cartridge assemblies?
Yes, it provides sealing and thread retention in hydraulic and pressure-control cartridges where moderate fluid exposure is present.
What maintenance or disassembly considerations should be noted for joints sealed with this product?
While offering strong vibration resistance, the sealant allows component separation during overhaul with appropriate localized heating and tool engagement.