Choosing the wrong sealant for the operating environment—specifically one with insufficient resistance to the assembly’s temperature, fluids, or chemicals—is a guaranteed path to seal degradation and eventual failure. When the cured sealant is exposed to conditions beyond its specification, it will soften, dissolve, or break down, leading to leaks.
Anaerobic sealants are highly chemical-resistant, but different formulations exist to meet specific thermal and fluid demands.
1. Temperature Mismatch (Thermal Failure)
Every sealant has a maximum continuous operating temperature. If the flange exceeds this limit (e.g., placing a standard 150∘C sealant on a high-temperature exhaust component), the cured polymer will soften and lose its structural integrity.
- Standard Temperature Need: For most general engine, transmission, and hydraulic applications, a sealant rated to at least 150∘C (302∘F) is sufficient.
- High Temperature Need: For components near exhaust manifolds, turbines, or high-heat industrial processes, you must select a specialized high-temperature formulation (often rated to 200∘C or higher).
2. Fluid and Chemical Incompatibility (Chemical Failure)
While all quality anaerobic sealants resist standard fluids (oil, coolant, transmission fluid), certain specialized fluids or chemicals can degrade a seal that wasn’t designed for them.
- Synthetic Oils: Some older sealant formulations may struggle with modern high-performance synthetic oils or specialized gear oils containing extreme pressure (EP) additives.
- Aggressive Solvents/Chemicals: Exposure to harsh industrial solvents, strong acids, or bases requires a sealant specifically engineered for maximum chemical resistance.
Recommended Product Selection Strategy
To ensure your seal lasts, you must match the sealant to the harshest condition it will face:
| Application / Condition | Recommended Incure Product | Key Feature / Rationale |
| General Purpose (Oil, Coolant) | HeatGrip™ 504 | Flexible 150∘C limit. Excellent resistance to standard powertrain fluids. |
| High Temperature | HeatGrip™ 503 | Rigid 200∘C limit. Designed for static, high-heat flanges where movement is minimal. |
| Aluminum & High Oil Exposure | HeatGrip™ 508 | Flexible 150∘C limit. Optimized for rapid cure on passive metals and superior resistance to challenging fluids. |
Crucial Advice: If you are uncertain about the temperature or the fluid type, always consult the sealant’s technical data sheet (TDS). It will list the specific chemical resistances and maximum operating temperatures, ensuring you select a product that won’t fail under the component’s unique operating stress.
If your current seal is failing due to degradation, switch to the specialized formulation that exceeds your assembly’s operational limits.