Devcon DFense Blok 30 lb

Devcon DFense Blok 30 lb

Alumina Ceramic bead filled epoxy
system with outstanding abrasion
resistance for severe service conditions.

RECOMMENDED APPLICATIONS

• Repairs to ash handling systems
  and scrubbers
• Prevents wear on metal surfaces that
  are exposed to severe abrasion and
  erosion such as chutes and launders
• Non sagging formulation
• Protecting flanges and elbows
• Lining bins and hoppers

APPLICATION INFORMATION

CURE

A 5mm thick section of DFense Blok will harden at 25ºC in
4-5 hours. The material will be fully cured in 16 hours. The
actual cure time of epoxy is determined by the mass used
and the environmental conditions at the time of repair

SURFACE PREPARATION

Proper surface preparation is essential to a successful
application. The following procedures should be considered:

• All surfaces must be dry, clean and with a suitable profile
  to facilitate bonding to the substrate.
• If surface is oily or greasy use Devcon Fast Cleaner 2000
  Spray/Cleaner Blend 300 to degrease the surface.
• Remove any existing paint, rust or other contamination
  from the surface by abrasive blasting or other mechanical
  techniques. Further reference can be made here to the
  Devcon Metal filled user guide.
• Aluminium repairs: Oxidation of aluminium surfaces will
  reduce the adhesion of an epoxy to a surface.
  This film must be removed before repairing the surface,
  by mechanical means such as grit-blasting, abrading or
  chemical means.
• Provide a “profile” on the metal surface by roughening the
  surface. This should be done ideally by grit blasting (8-40
  mesh grit), or by grinding with a coarse wheel or abrasive
  disc pad. An abrasive disc may be used provided white
  metal is revealed. Do not ’feather edge’ epoxy materials.
  Epoxy material must be ’locked in’ by defined edges and
  a good 3-5 mil profile.
• Metal that has been handling sea water or other salt
  solutions should be grit blasted and high pressure water
  blasted and left overnight to allow any salts in the metal
  to ’sweat’ to the surface. Repeat blasting may be
  required to ’sweat out’ all the soluble salts. A test for
  chloride contamination should be performed prior to
  any epoxy application. The maximum soluble salts left on
  the substrate should be no more than 40 ppm (parts per
  million).
• Chemical cleaning with Devcon Fast Cleaner 2000 Spray/
  Cleaner Blend 300 should follow all abrasive preparation.
  This will help to remove all traces of sandblasting, grit, oil,
  grease, dust or other foreign substances.
• Under cold working conditions, heating the repair area
  to 38ºC-43º C immediately before applying any of
  Devcon Epoxies is recommended. This procedure dries
  off any moisture, contamination or solvents and assists
  the epoxy in achieving maximum adhesion to the substrate.
• Always try to make the repair as soon as possible after
  cleaning the substrate, to avoid oxidation or flash rusting.
  If this is not practical, a general application of FL-10 Primer
  will keep metal surfaces from flash rusting.

ADDITIONAL SURFACE PREPARATION INFORMATION

If abrasive blasting is not possible and expanded metal
cannot be welded in place then the Surface Wetting Agent
is essential where maximum adhesion to substrate is
required. This should be applied at 250 to 500 microns
after which the DFence Blok can be applied immediately.
For bridging large gaps or holes it is essential to place fibreglass sheet, expanded metal or other suitable mechanical
fasteners across the area prior to application of the DFence
Blok.

MIXING

Add the hardener to the resin then mix thoroughly
using a suitable mixing paddle or suitable size jiffy type
mixer. Mix in such a fashion that the material is thoroughly
dispersed from top to bottom of the container until
homogenous.

APPLICATION

Spread the material over the prepared surface with a putty
knife or spatula pressing firmly into all cracks and voids to
ensure maximum surface contact and avoid trapping air.
A film of at least 5mm and up to 15mm can be applied in
one coat if required even onto vertical surfaces without
sagging. If a coat of greater than 15mm is required then it
is important to let the first coat cure partially until firm such
that the a subsequent coat can be applied.
For overhead applications it is possible to build 10mm in
one coat, again if more is required then it is important to
leave it to cure to firm before subsequent applications.

SHELF LIFE & STORAGE

A shelf life of 3 years from date of manufacture can be
expected when stored at room temperature (22ºC) in their
original containers.

PRECAUTION

For complete safety and handling information, please refer
to Material Safety Data Sheets (MSDS) prior to using this
product.

WARRANTY

ITW Performance Polymers will replace any material found to
be defective. As storage, handling and application of this
material is beyond our control we can accept no liability
for the results obtained.
TDS
SDS

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