Loctite 515 Master Gasket Flexible Sealant 50ml
Available
Loctite 515 is a one-component, anaerobic methacrylate ester flange sealant. It is an opaque, dark purple material that forms a gasket in place and flexes with minor flange movement.
It is designed for close-fitting flanges with gaps up to 0.25mm, on pumps, thermostats, compressors, transmission housings and axle covers. It shows positive fluorescence under UV light, which helps with inspection.
Where this product is used
- Form-in-place gaskets on pumps and compressors
- Thermostat sealing
- Transmission housings and axle covers
- Close-fitting flanges with minor movement and gaps up to 0.25mm
Features
- One component, no mixing
- Flexes with minor flange movement
- Designed for gaps up to 0.25mm
- Opaque dark purple, with positive fluorescence under UV light
- Anaerobic cure, with Activator SF 7471 or SF 7649 where cure is slow or gaps are large
- Lap shear 6.0 N/mm² on grit-blasted steel (ISO 4587)
- AGA Certificate 2590 (regional approval)
Key specifications
| Specification | Detail |
|---|---|
| Brand | Loctite |
| Chemical type | Methacrylate ester (acrylic technology) |
| Colour | Opaque, dark purple (uncured); positive fluorescence under UV |
| Components | One component, no mixing |
| Cure | Anaerobic; Activator SF 7471 or SF 7649 where cure is slow or gaps are large |
| Viscosity (Brookfield HBT, spindle TB, Helipath, 25 °C, 5.0rpm) | 150,000 to 375,000 mPa·s |
| Specific gravity (25 °C) | 1.1 |
| Gap fill | Up to 0.25mm |
| Lap shear (ISO 4587, grit-blasted steel, 24 h at 22 °C) | 6.0 N/mm² |
| Compressive shear (ISO 10123, steel pins and collars, 1 h and 24 h at 22 °C) | 5.0 N/mm² or more |
| Tensile strength (ISO 6922, 24 h at 22 °C) | 14 N/mm² |
| Approvals | AGA Certificate 2590, Class II, working pressure 500 kPa, working temperature -10 °C to 150 °C (regional approval). UL Classification MH8007 (regional approval) |
| Storage | 8 °C to 21 °C, unopened, dry |
Choosing the right option
For a medium strength red anaerobic gel on rigid flanges see Loctite 518 Gasket Eliminator Flange Sealant; for a blue flexible anaerobic gasket paste see Loctite 5127 Flexible Anaerobic Gasket Eliminator - 50ml (38657). Where cure is slow or the gap is large, use Activator SF 7471 or SF 7649: Loctite 7471 Primer T Surface Preparation Activator Aerosol 133g and Loctite SF 7649 Activator for Anaerobic Adhesives 133ml.
See also: Loctite 518 Gasket Eliminator Flange Sealant, Loctite 5127 Flexible Anaerobic Gasket Eliminator - 50ml (38657), Loctite 510 Gasket Eliminator Flange Sealant, Loctite 7471 Primer T Surface Preparation Activator Aerosol 133g.
| Option | Part number | SKU |
|---|---|---|
| 50 ml | 515-50ML-LOC | A0049786 |
| 300 ml | 515-300ML-LOC | A0049787 |
Using it
Activator SF 7471 or SF 7649 is the secondary cure where cure is slow or gaps are large. Cure speed depends on the materials, the gap and the temperature.
Compressive shear on steel pins and collars is 5.0 N/mm² or more after 1 hour and after 24 hours at 22 °C. Lap shear after 24 hours at 90 °C, tested at 22 °C, is 6.9 N/mm² or more.
Hot strength tests from 0 °C to 150 °C and heat ageing at 100 °C, 120 °C and 150 °C up to 1,000 hours.
Storage and handling
Store unopened in a dry location, optimally between 8 °C and 21 °C. Storage below 8 °C or above 28 °C can adversely affect the properties of the product.
Limits and safety
Not suited to continuous contact with petrol: strength falls to about 15% of initial after 1000 hours in gasoline at 22 °C. Run trials to confirm suitability for your application; the AGA and UL listings are regional approvals.
This is a regional approval.
Not always.
It is positively fluorescent under UV light, which helps with inspection.
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Loctite 515 Master Gasket Flexible Sealant: 50 ml
SKU: A0049786 | Model: 515-50ML-LOC
Loctite 515 flexible flange sealant, 50ml. Gaps up to 0.25mm; 6.0 N/mm² lap shear on grit-blasted steel.