Loctite 408 Instant Adhesive 20g
Loctite 408 Instant Adhesive 20g
- Shear Strength, Grit Blasted Steel : 2600 psi
- Temperature : -65 - 200 °F
- Viscosity : 5 mPa.s (cP) Brookfield
- Key Substrates : Metals , Plastics and Elastomers
- Color : Clear: Ultra Clear
- Curing Type : Humidity
- Application : Bonding
LOCTITE® 408 is a transparent, colorless, low odor, low bloom, alkoxyethyl-based instant adhesive (cyanoacrylate) which cures very quickly when confined between two close-fitting surfaces. It is suitable for plastics and polyolefins in combination with Primer LOCTITE® SF 770 or LOCTITE® SF 7239 and ideal for metal, rubber and well suited for porous and/or acidic surfaces.
- Suited for plastics and polyolefins in combination with Primer LOCTITE 770 or LOCTITE 7239
- Ideal for metal and rubber
- Well suited for porous and/or acidic surfaces
- Low bloom, low odor
- H & S Labelling-free
- Capillary action
408™ has low odor and low blooming properties
and is particularly suitable for applications where vapor control
is difficult. The product provides rapid bonding of a wide range
of materials, including metals, plastics and elastomers.
408™ is particularly suited for bonding porous or
absorbent materials such as wood, paper, leather and fabric.
TYPICAL CURING PERFORMANCE
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:
- Bond areas should be clean and free from grease. Clean
all surfaces with a Loctite®
cleaning solvent and allow to
- To improve bonding on low energy plastic surfaces,
Loctite® Primer may be applied to the bond area. Avoid
applying excess Primer. Allow the Primer to dry.
- LOCTITE® Activator may be used if necessary. Apply it to
one bond surface (do not apply activator to the primed
surface where Primer is also used). Allow the Activator to
- 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
- Bonds should be held fixed or clamped until adhesive has
- 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
Loctite Material Specification
LMS dated December-22, 2011. 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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