Loctite 4902 Cyanoacrylate Adhesive



Loctite 4902 Flexible Cyanoacrylate Adhesive Clear 20 G Bottle

  • Viscosity : Low
  • Key Substrates : Plastics, Rubbers and Metals
  • Color : Clear
  • Curing Type : Humidity
  • Application : Assembly of disposable medical

Loctite 4902 Flexible Cyanoacrylate Adhesive Clear is used for the assembly of flexible medical devices and bonding to substrates such as metal, plastic, and rubber. It has excellent sealing properties, fast humidity cure, and high strength flexing bond lines. It also meets ISO 10993 requirements. 20 g Bottle. For difficult-to-bond substrates such as polyethylene and polypropylene, use LOCTITE® 770™ or LOCTITE® 7701™ polyolefin primers.

  • Used for the assembly of flexible medical devices and bonding to substrates such as metal, plastic, and rubber.
  • Ultra-quick fixture time
  • Transparent and colourless
4902™ is a highly flexible cyanoacrylate adhesive
designed for the assembly of flexible medical devices. This
product facilitates the use of dissimilar and opaque substrates
while improving device performance. LOCTITE®
4902™ offers
significant performance enhancements compared to standard
cyanacrylates, including strength in flexing bond lines and
resistance to leaks with excellent sealing capability. Known
performance advantages of cyanoacrylates are maintained,
including speed, ease of use and strength.

An ISO 10993 Test Protocol is an integral part of the Quality
Program for LOCTITE®
4902™. LOCTITE®
4902™ 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.

Cure Speed vs. Substrate

The rate of cure will depend on the substrate used. The time
to develop a shear strength of 0.1 N/mm² on different
materials at 22 °C and 50% relative humidity
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.
Higher relative humidity levels result in more rapid speed of
Cure Speed vs. Activator

Where cure speed is unacceptably long due to large gaps,
applying activator to the surface may 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. 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.
  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).
  8. This product performs best in thin bond gaps (0.05 mm / 2
    mil ).

Loctite Material Specification

LMS dated October-30, 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

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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