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DESCRIPTION
The Koster NB 1 Sealing Slurry
grey is a mineral coating
with excellent capillary
sealing properties. It
contains crystallising
agents which penetrate
deep to fill the voids
and capillaries and that
react with moisture and
ingredients in the substrate
to form crystals and thus
creating the waterproofing
effect, to seal off ground
moisture, non-pressurised
and pressurised water
– on both the positive
and the negative side.
The Koster NB I Sealing Slurry
becomes an integral part
with the substrate itself.
Once applied to the substrate,
it leaves a coating with
excellent pressure- and
abrasion resistance and
has excellent resistance
to chemical compounds.
Koster NB 1 should only be
used on substrates that
are free of cracks. Adding
of Koster SB-Bonding Emulsion
increases the water retentivity
and thus prevents dehydration
under unfavourable weather
conditions (warm, dry,
draught), which may cause
cracks in the coating.
Koster SB-Bonding Emulsion
makes the Koster NB-Sealing
Slurry I grey more flexible
thus improving its resistance
to thermal movements.
Because Koster NB I Sealing
Slurry reacts with the
free lime in the substrate,
it uses the strength and
decreased porosity of
the substrate to create
its waterproofing effect;
it can be used on both
positive and negative
side.
TECHNICAL DATA
| Compressive
strength |
: 25.6 N / mm² |
| Flexure
tensile strength |
:
6.2 N / mm² |
| Bonding
strength |
: 1.1 N / mm² |
| Coefficient
of water vapour diffusion
resistance |
: 60 |
| Positive
side water permeability |
:
140 m water head
(14.06
bar) |
|
Negative side water
permeability |
:
140 m water head
(14.06 bar) |
| Pot
life (20° C) |
:
app. 2 hours |
| Resistant
to foot traffic |
:
after app. 2 days |
| Curing
process completed
|
:
after app. 2 weeks |
FIELD OF APPLICATION
The Koster NB-Sealing Slurry
I grey seals horizontal
and vertical surfaces
made of concrete, masonry
or cementitious plaster
(only positive side) in
damp rooms, bathrooms,
shower rooms, new basements,
containers, swimming pools,
silos, sewage plants,
shafts, retaining walls,
planters etc. Koster NB I
Sealing Slurry can be
used on both positive
and negative side, provided
that access to the base
substrate is possible
(e.g. the internal wall
of a basement is stripped
off plaster for treatment
directly on the base wall).
PREPARATION OF
SUBSTRATE
The surface has to be
sound and solid, free
of laitance, paint, form
oil and other contaminants
that might affect the
bonding adversely. This
also includes plasters
and skim coats where the
bond strength cannot be
verified. Suitable tools
and methods are wire brushes,
high-pressure water jets,
sand and shot blasting.
Cracks and surface honeycombs
should be chiselled open
so that application of
an even uniform coat can
be achieved. Cracks and
depressions larger than
5 mm should be filled
with Köster Repair
Mortar and be left for
curing for at least 24
hours. For improved bonding,
strengthening and water
resistance, we always
recommend the use of Koster
Polysil. Substrates should
always be well saturated
with water before commencing
with the application of
Koster NB I. Wet down the
substrate thoroughly before
applying NB I.
APPLICATION
Add one 25 kg bag of Koster
NB I to a mixture of 6l
water and 2 l Koster SB Bonding
Emulsion (app.10 kg Koster
NB I : 3 – 3.5 l
water). Mix the material
with a slow speed mixer.
To avoid pinholes always
apply Koster NB I in 2 or
more layers. Follow the
regulations of DIN 1045;
i.e. avoid heat, frost
and strong wind impact
during the application
and at least 24 hours
afterwards. B I should
be applied using a MAUTROL®
Brush or a masons brush.
Koster NB I can also be spray
applied with suitable
equipment. Do not add
any extra water to the
mixed slurry, the consistency
should be thick and yet
applicable with brush.
SPECIAL FIELD
OF APPLICATION
Highly efficient waterproofing
with bituminous construction
material
When combining Koster NB I
with a crack-bridging
bituminous system, the
properties and advantages
of both systems are complimented.
Thus combining a tremendous
surface bond, deep penetration,
crystallising and pore
filling properties with
dynamic crack-bridging
properties of the bituminous
system. Apply Koster NB I
directly to the well prepared
substrate and let it cure
for 24 hours before applying
the bituminous coating
(BIKUTHAN 1C and 2C, DEUXAN
2C and KBE Liquid Film).
The priming layer of Koster
NB I reduces the risk
of bubble formation of
bituminous construction
materials on porous substrates
and reduces the risk of
backflow on problematic
wall /floor junctions.
CONSUMPTION
| protection from
ground moisture |
: min. 2 kg / m²
(2coats) |
| protection from
non-pressurised water |
: min. 3 kg / m²
(2 coats) |
| protection from
pressurised water |
: min. 4 kg / m²
(2-3 coats) |
| Combined system
with bituminous construction
materials: |
|
| Consumption |
: min. 2 kg/m²
(1 coat) |
CLEANING OF TOOLS
With water immediately
after use.
PACKAGING
25 kg PE lined paper bag
STORAGE
Dry in unopened bags.
SHELF LIFE
12 months in unopened
bags.
SAFETY PRECAUTIONS
Wear protective gloves
and goggles during application.
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