Loctite 680 Retaining Compound

Loctite 680 Low-visc High Strength Retaining Compound 50ml

• Shear Strength, Steel : 4000 psi
• Temperature : -65 - 300 °F
• Viscosity : 1250 mPa.s (cP) Brookfield
• Key Substrates : Metal
• Color : Green
• Curing Type : Anaerobic
• Application : Retaining

 

LOCTITE 680 is a green, high strength, methacrylate ester acrylic liquid designed for the bonding of cylindrical fitting parts, particularly where low viscosity is required. The product prevents loosening and leakage from shock and vibration. It provides robust curing performance. It works on active metals (e.g. mild steel) and on passive substrates (e.g. stainless steel and plated surfaces).

• Low viscosity
• Provides robust curing performance
• Cures when confined in the absence of air between close fitting metal surfaces
• Offers high temperature performance and oil tolerance
• Tolerates minor surface contaminations from various oils
• Certified to ANSI/NSF Standard 61 for use in commercial and residential potable water systems not exceeding +179.6 °F (+82 °C)

LOCTITE®
680™ is designed for the bonding of cylindrical
fitting parts, particularly where low viscosity is required. The
product cures when confined in the absence of air between
close fitting metal surfaces and prevents loosening and
leakage from shock and vibration. LOCTITE®
680™ provides
robust curing performance. It not only works on active metals
(e.g. mild steel) but also on passive substrates such as
stainless steel and plated surfaces. The product offers high
temperature performance and oil tolerance. It tolerates minor
surface contaminations from various oils, such as cutting,
lubrication, anti-corrosion and protection fluids.
This Technical Data Sheet is valid for LOCTITE®
680™
manufactured from the dates outlined in the
"Manufacturing Date Reference" section.

NSF International

Certified to ANSI/NSF Standard 61 for use in commercial and
residential potable water systems not exceeding 82° C. Note:
This is a regional approval. Please contact your local Technical
Service Center for more information and clarification

TYPICAL CURING PERFORMANCE

Cure Speed vs. Substrate

The rate of cure will depend on the substrate used. The graph
below shows the shear strength developed with time on steel
pins and collars compared to different materials and tested
according to ISO 10123.

Cure Speed vs. Bond Gap

The rate of cure will depend on the bondline gap. The following
graph shows shear strength developed with time on steel pins
and collars at different controlled gaps and tested according to
ISO 10123.

Cure Speed vs. Temperature

The rate of cure will depend on the temperature. The graph
below shows the shear strength developed with time at
different temperatures on steel pins and collars and tested
according to ISO 10123.

Cure Speed vs. Activator

The graph below shows the shear strength developed with
time on stainless steel pins and collars using Activator SF
7471™, SF 7649™ and SF 7091™ and tested according to
ISO 10123.

GENERAL INFORMATION

This product is not recommended for use in pure oxygen
and/or oxygen rich systems and should not be selected as
a sealant for chlorine or other strong oxidizing materials.
For safe handling information on this product, consult the
Safety Data Sheet (SDS).
Where aqueous washing systems are used to clean the
surfaces before bonding, it is important to check for compatibility of the washing solution with the adhesive. In
some cases these aqueous washes can affect the cure and
performance of the adhesive.
This product is not normally recommended for use on plastics
(particularly thermoplastic materials where stress cracking of
the plastic could result). Users are recommended to confirm
compatibility of the product with such substrates.

Directions for use

For Assembly

1. For best results, clean all surfaces (external and internal) with a LOCTITE®
   cleaning solvent and allow to dry.
2. To accelerate cure speed or where large gaps are
   present, use activator and allow to dry.
3. For Slip Fitted Assemblies, apply adhesive around the
   leading edge of the pin and the inside of the collar and
   use a rotating motion during assembly to ensure good
   coverage.
4. For Press Fitted Assemblies, apply adhesive thoroughly
   to both bond surfaces and assemble at high press on
   rates.
5. For Shrink Fitted Assemblies, the adhesive should be
   coated onto the part to produce a smooth, even film of
   material. If heating the hub for assembly, coat the pin. If
   the pin is to be cooled for assembly, coat the hub. If both
   heating and cooling is to be done, apply material to cooled
   part. Avoid condensation on cooled parts.
6. Parts should not be disturbed until sufficient handling
   strength is achieved.

For Disassembly

1. Remove with standard hand tools.
2. If needed, apply localized heat to the assembly to
   approximately 250 °C. Disassemble while hot.
3. If this temperature is not possible, heat as much as
   possible and use mechanical aids.

For Cleanup

1. Cured product can be removed with a combination of
   soaking in a LOCTITE®
   solvent and mechanical abrasion
   such as a wire brush.

Loctite Material Specification

LMS dated August-6, 2013. Test reports for each batch are
available for the indicated properties. LMS test reports include
selected QC test parameters considered appropriate to
specifications for customer use. Additionally, comprehensive
controls are in place to assure product quality and
consistency. Special customer specification requirements may
be coordinated through Henkel Quality.

Storage

Store product in the unopened container in a dry location.
Storage information may be indicated on the product container
labeling.
Optimal Storage: 8 °C to 21 °C. Storage below 8 °C or
greater than 28 °C can adversely affect product properties.
Material removed from containers may be contaminated during
use. Do not return product to the original container. Henkel
Corporation cannot assume responsibility for product which
has been contaminated or stored under conditions other than
those previously indicated. If additional information is required,
please contact your local Technical Service Center or
Customer Service Representative.