Loctite 620 High Temperature Retaining Compound 50ml
Available
Loctite 620 is a green, anaerobic retaining compound with a high viscosity and a medium to high strength class. It is a methacrylate ester for bonding cylindrical fitting parts, and it cures between close-fitting metal surfaces without air.
It offers higher temperature performance, and it suits bond gaps that can approach 0.2mm where maximum strength at room temperature is required. Typical uses are locating pins in radiator assemblies, bearings in automatic transmissions, and bushings and sleeves in housings and on shafts.
Where this product is used
- Locating pins in radiator assemblies
- Bearings in automatic transmissions
- Bushings and sleeves into housings and on shafts
- Cylindrical fitting parts with bond gaps that can approach 0.2mm
- Assemblies that suit a higher temperature retaining compound
Features
- Medium to high strength
- High viscosity: 8,500 mPa·s (Brookfield RVT, 25 °C)
- Strength rises from 17 to 24 N/mm² after a further 24 hours at 177 °C
- Suited to bond gaps that can approach 0.2mm
- Cure can be accelerated with Activator SF 7471 or SF 7649
- Removable with local heat to approximately 300 °C
- Green liquid
Key specifications
| Specification | Detail |
|---|---|
| Brand | Loctite |
| Chemical type | Methacrylate ester (acrylic) |
| Colour | Green liquid |
| Strength class | Medium to high |
| Viscosity class | High |
| Cure | Anaerobic |
| Secondary cure | Activator SF 7471 or SF 7649 |
| Viscosity (Brookfield RVT, 25 °C, spindle 5, 20rpm) | 8,500 mPa·s |
| Viscosity (EN 12092 MV, 25 °C) | 1,800 mPa·s after 180 s at shear rate 129 1/s |
| Specific gravity (23 °C) | 1.16 |
| Compressive shear, 24 h at 23 °C (ISO 10123, steel pins and collars) | 17 N/mm² |
| Compressive shear, 24 h at 23 °C then 24 h at 177 °C, tested at 23 °C | 24 N/mm² |
| Disassembly | Local heat to approximately 300 °C, disassemble while hot |
| Storage | Unopened, dry; optimal 8 °C to 21 °C |
Choosing the right option
The 10ml pack is Loctite 620 High Temperature Retaining Compound 10ml. For other retaining compounds see Loctite 648 High Strength, High Temperature Retaining Compound 50ml, Loctite 638 Retaining Compound 50ml and Loctite 680 High Strength Retaining Compound 50ml.
See also: Loctite 620 High Temperature Retaining Compound 10ml, Loctite 648 High Strength, High Temperature Retaining Compound 50ml, Loctite 638 Retaining Compound 50ml, Loctite 680 High Strength Retaining Compound 50ml.
Using it
Cure speed depends on the materials, the gap and the temperature. Do not disturb the parts until sufficient handling strength is achieved.
Activator SF 7471 or SF 7649 can be used to accelerate cure.
To disassemble, apply localised heat to the assembly to approximately 300 °C.
Do not return used product to the container.
Storage and handling
Store unopened in a dry location, with optimal storage at 8 °C to 21 °C. Storage below 8 °C or above 28 °C can adversely affect properties.
Limits and safety
Not recommended for pure oxygen or oxygen-rich systems, or as a sealant for chlorine or other strong oxidising materials. Not normally recommended for plastics, where stress cracking can occur. Check compatibility before use in aqueous washing systems. Read the safety data sheet before use.
It offers higher temperature performance, and shows hot strength from 0 to 250 °C and heat ageing at 120, 150 and 180 °C in graphs.
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