www.belzona.com Publication No. 43-03-20
1. TO ENSURE AN EFFECTIVE MOLECULAR
WELD
1.1 METALLIC SURFACES
a) Remove all loose surface contamination and degrease with
Belzona®9111 (Cleaner/Degreaser) or any other effective cleaner
which does not leave a residue e.g. methyl ethyl ketone (MEK).
b) Select an abrasive to give the necessary standard of cleanliness
and a minimum depth of profile of 3 mils (75 microns). Use only an
angular abrasive.
c) Blast clean the metal surface to achieve the following standard of
cleanliness:
ISO 8501-1 Sa 2½ very thorough blast cleaning
American Standard near white finish SSPC SP 10
Swedish Standard Sa 2½ SIS 05 5900
d) After blasting, metal surfaces should be coated before any
oxidation of the surface takes place.
SALT CONTAMINATED SURFACES
Metal surfaces that have been immersed for any periods in salt
solutions e.g. sea water, should be blasted to the required
standard, left 24 hours to allow any ingrained salts to sweat to the
surface and then washed prior to a further brush blast to remove
these. This process may need to be repeated to ensure complete
removal of salts. The soluble salt contamination of the prepared
substrate, immediately prior to application, should be less than
20mgs/m².
1.2 FLEXIBLE SURFACES (e.g. rubbers)
NOTE: Belzona®9111 can draw processing oils and waxes to the
surface of some rubbers, particularly when new, which then impairs
adhesion of Belzona®2141.
Test for this on a small area. If, on rubbing with a rag moistened
with Belzona®9111, a greasy film appears, the surface should not
be degreased, but simply abraded.
Undercut fine edges with a sharp knife and scuff the surface with a
rotary wire brush or suitable roughing tool.
1.3 EXISTING BELZONA SURFACES.
a) When using Belzona®2141 to overcoat a surface which has been
treated with Belzona®1111 or Belzona®1311, the Belzona product
must first be allowed to fully cure and the surface abraded, followed
by conditioning as below.
b) Application of Belzona®2141 over Belzona®1221 can be carried
out up to 4 hours after the application of Belzona®1221 without the
need of any surface treatment other than removal of contamination.
When overcoating Belzona®1221 after this time, the surface
should be abraded, followed by conditioning as below.
c) When applying the Belzona®2141 system over a Belzona coating
such as Belzona®1341 (not NSF Grade) or Belzona®5811 the
coating may be overcoated by Belzona®2941 once hard and
within its overcoat time without further surface preparation. Once
beyond the coatings overcoat time it must be flash blasted to
produce a minimum 25 micron profile before conditioning.
CONDITIONING
All surfaces must be Conditioned before applying Belzona®2141.
Metal surfaces, Belzona®1000 series and Belzona®5811 apply
Belzona®2941
Rubber and other non-metallic surfaces apply Belzona®2911 or
Belzona®2921.
Apply a thin, even coat of Belzona®Conditioner onto the surface.
A brush should be used as a stipple.
Practical coverage rate
Belzona®2941 19.8 sq.ft. (1.83 sq.m) per unit, on metallic
substrates.
Belzona®2911 and Belzona®2921, 13 sq.ft. (1.25 m²) per unit, on
smooth substrates. On well roughened rubber substrates this could
be reduced by as much as 50%.
The Belzona®Conditioner must be completely touch dry before
overcoating with Belzona®2141. This will depend on the prevailing
temperature, relative humidity, ventilation and substrate. At 68°F
(20°C) and 50% relative humidity, the touch dry state will be
achieved after the times given when applied to a steel surface.
NOTE:
i) Relative humidity should be between 30 & 90% and surface
temperature at least 5°F (3°C) above dew point during the
application and drying of the Conditioner.
ii) At lower temperatures and humidity a longer drying time is
required.
iii) These times may be extended when applied to rubber
substrates.
iv) If in doubt leave Conditioner longer to dry but under no
circumstances should maximum overcoat time be exceeded.
SHELF LIFE
Belzona®2941 & Belzona®2921 have a 24 month shelf life and
Belzona®2911 has an 18 month shelf life from date of manufacture
when stored at 41 - 77°F (5 - 25°C) and must be used before the stated
“use-by” date.
WHERE BELZONA®2141 SHOULD NOT ADHERE
Brush on Belzona®9411 (Release Agent) and allow to dry for 15 - 20
minutes before proceeding to step 2.
2. COMBINING THE REACTIVE
COMPONENTS
Both Base and Solidifier components must remain sealed until the
application stage.
a) Transfer the entire contents of the Base into the Solidifier container.
