Loctite 431 Instant Adhesive 20g



Loctite 431 Instant Adhesive 20g

  • Shear Strength, Grit Blasted Steel : 2300 psi
  • Full Cure Temperature : 77 °F
  • Viscosity : 900 mPa.s (cP) Brookfield
  • Key Substrates : Metals , Plastics and Elastomers
  • Color : Clear: Ultra Clear
  • Curing Type : Humidity
  • Application : Bonding

LOCTITE® 431 is a transparent, colorless, medium viscosity, general purpose, ethyl-based instant adhesive. Suitable for metals, rubbers, plastic and also suitable for polyolefins in combination with Primer LOCTITE® SF 770 or LOCTITE® SF 7239. It has a fixture time of 5 - 10 secs and is well suited to porous and/or acidic surfaces.

  • Cures very quickly when confined between two surfaces
  • Ideal for bonding small to medium-size parts
  • Excellent adhesion to most substrates
  • Suitable for metals, rubbers, plastics and suited to polyolefins in combination with Primer LOCTITE 770 or LOCTITE 7239
  • Well suited to porous and/or acidic surfaces
  • Fixture time of 5 - 10 secs.
  • Solvent-free
  • Medium viscosity
431™ is designed for the assembly of difficultto-bond materials which require uniform stress distribution and
strong tension and/or shear strength. The product provides
rapid bonding of a wide range of materials, including metals,
plastics and elastomers. LOCTITE®
431™ is also suited for
bonding porous materials such as wood, paper, leather and

An ISO 10993 Test Protocol is an integral part of the Quality
Program for LOCTITE®
431™. LOCTITE®
431™ has
been qualified to Henkel's ISO 10993 Protocol as a means to
assist in the selection of products for use in the medical device
industry. Certificates of Compliance are available on Henkel's
website or through the Henkel Quality Department. Note: This
is a regional approval. Please contact your local Technical
Service Center for more information and clarification.

Under normal conditions, the atmospheric moisture initiates the
curing process. Although full functional strength is developed
in a relatively short time, curing continues for at least 24 hours
before full chemical/solvent resistance is developed.
Cure Speed vs. Substrate

The rate of cure will depend on the substrate used. The table
below shows the fixture time achieved on different materials
at 22 °C / 50 % relative humidity. This is defined as the time to
develop a shear strength of 0.1 N/mm².
Cure Speed vs. Bond Gap

The rate of cure will depend on the bondline gap. Thin bond
lines result in high cure speeds, increasing the bond gap will
decrease the rate of cure.
Cure Speed vs. Humidity

The rate of cure will depend on the ambient relative
humidity. The best results are achieved when the relative
humidity in the working environment is 40% to 60% at 22°C.
Lower humidity leads to slower cure. Higher humidity
accelerates it, but may impair the final strength of the bond.
Cure Speed vs. Activator

Where cure speed is unacceptably long due to large gaps,
applying activator to the surface will improve cure speed.
However, this can reduce ultimate strength of the bond and
therefore testing is recommended to confirm effect.

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).
Directions for use:

  1. Bond areas should be clean and free from grease. Clean
    all surfaces with a Loctite®
    cleaning solvent and allow to
  2. Loctite® Primer may be applied to the bond area. Avoid
    applying excess Primer. Allow the Primer to dry.
  3. LOCTITE® Activator may be used if necessary. Apply the
    LOCTITE® Activator to one bond surface (do not apply
    activator to the primed surface where Primer is also
    used). Allow the Activator to dry.
  4. Apply adhesive to one of the bond surfaces (do not apply
    the adhesive to the activated surface). Do not use items
    like tissue or a brush to spread the adhesive. Assemble
    the parts within a few seconds. The parts should be
    accurately located, as the short fixture time leaves little
    opportunity for adjustment.
    Activator can be used to cure fillets of product
    outside the bond area. Spray or drop the activator on the
    excess product.
  6. Bonds should be held fixed or clamped until adhesive has
  7. Product should be allowed to develop full strength before
    subjecting to any service loads (typically 24 to 72 hours
    after assembly, depending on bond gap, materials and
    ambient conditions).

Loctite Material Specification

LMS dated December-22, 2005. 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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