Loctite 278 Acrylic Anaerobic Threadlocker Green 50ml



Loctite 278 Acrylic Anaerobic Threadlocker Green 50ml

  • Strength : High
  • Viscosity : 2400 - 3600 mPa.s (cP) Brookfield
  • Key Substrates : Metal: Brass, Metal: Steel, Metal: Steel - Stainless Steel
  • Color : Green
  • Curing Type : Anaerobic
  • Application : Threadlocking

LOCTITE® 278 is a green, high strength, medium viscosity, methacrylate-based threadlocking adhesive. It has a fixture time on steel of 20 min, brass 20 min and stainless steel 60 min. Can tolerate slight contaminations of industrial oils. High temperature resistance.

  • Medium viscosity
  • Breakaway torque on M10 bolts of 42 Nm
  • Prevents unwanted movement, loosening, leaks and corrosion
  • Resists vibration
  • High strength
  • High temperature resistance
278™ is designed for the permanent locking and
sealing of threaded fasteners. The product cures when
confined in the absence of air between close fitting metal
surfaces and prevents loosening and leakage from shock and
vibration. Particularly suitable for applications on less active
substrates such as coated or plated surfaces, and/or for
applications where temperature resistance is required.

Fixture Time

Fixture time is defined as the time to develop a fixation
strength on M10 nuts and bolts against manual forces.
Fixture Time, ISO 10964, seconds : 210 to 270
Brass nuts and bolts (unseated)
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 M10
steel nuts and bolts compared to different materials and tested
according to ISO 10964
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 breakaway strength developed with time at
different temperatures on M10 steel nuts and bolts and tested
according to ISO 10964.

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
Material Safety Data Sheet (MSDS).
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. If the material is an inactive metal or the cure speed is too
    slow, spray all threads with Activator 7471™ or 7649™
    and allow to dry.
  3. To prevent the product from clogging in the nozzle, do not
    allow the tip to touch metal surfaces during application.
  4. For Thru Holes, apply several drops of the product onto
    the bolt at the nut engagement area.
  5. For Blind Holes, apply several drops of the product down
    the internal threads to the bottom of the hole.
  6. For Sealing Applications, apply a 360° bead of product
    to the leading threads of the male fitting, leaving the first
    thread free. Force the material into the threads to
    thouroughly fill the voids. For bigger threads and voids,
    adjust product amount accordingly and apply a 360° bead
    of product on the female threads also.
  7. Assemble and tighten as required.

For Disassembly

  1. Apply localized heat to nut or bolt to approximately 350
    °C. Disassemble while hot.

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 February-26, 2008. 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.

Store product in the unopened container in a dry location.
Storage information may be indicated on the product container
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.
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