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Loctite 518 vs DOWSIL 736 Heat Resistant Sealant (ex Dow Corning 736)

Anaerobic rigid-flange gasket vs flexible high-temperature RTV silicone.

// Key differences

  • Cure: 518 cures only between metal parts without air; DOWSIL 736 cures in air from humidity.
  • Flexibility: 736 stays elastic and tolerates flange movement; 518 suits rigid, close-fitting flanges.
  • Temperature: 736 is rated higher for continuous heat exposure.

Choose Loctite 518 for:

Rigid aluminium or steel flanges.

Choose DOWSIL 736 Heat Resistant Sealant (ex Dow Corning 736) for:

Oven doors, flues, flexible joints exposed to high heat.

Full specification comparison

ParameterLoctite 518DOWSIL 736 Heat Resistant Sealant (ex Dow Corning 736)
ManufacturerHenkel (LOCTITE)Dow (DOWSIL)
CategorySealants & GasketsSealants & Gaskets
Temperature range-55°C … +150°C-65°C … +260°C
Standards / approvalsNSF P1MIL-A-46106
ChemistryUrethane methacrylate (anaerobic)1K silicone (acetoxy)
Operating temperature-55°C … +150°C-65°C … +260°C
Gap fill0.25 mm—
Fixture time25 min—
ViscosityThixotropic gel—
SpecificationNSF P1MIL-A-46106
TDS & quoteTDS & quote

Data compiled from manufacturer data sheets — confirm critical values with the official TDS.

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