Features / Advantages
- Cures at ambient temperatures to a
tough, elastic and flexible rubber like
material.
- Bonds strongly to most of the building
materials with the use of recommended
primers.
- Durable, remains unaffected by UV rays,
ozone and weathering conditions.
- Resistant to water, salt water, 10%
dil. acids except nitric acids, 10% alkalies,
most of the common chemicals, vegetable,
lubricating oils and fuels.
- Performs well in a temperature ranging
from -40ºC to +80ºC and +100ºC
intermittent.
- Resistent to biodegradation, prevents
growth of fungus & micro-organism.
- Slip resistant (sag) can be applied
in a horizontal joints.
- Movement capability - Provides satisfactory
hermatic sealing of the joint subjected
to expansion, contraction, vibration and
cyclic movement within the following limits.
- Movement joints upto + 25% of the width.
- Slip resistant (non-sag) can be applied
in vertical & ceiling joints.
- Self leveling, after pouring in horizontal
joint levels itself.
- Resilient recovers the original width
after expansion & contraction without
the loosing the surface bond.
- Excellent repairability property.
- It can be overcoated by waterproofing
compounds.
- Non-toxic.
- Sealant will not cause staining to
concrete masonry or stones.
Application
- Sealing of expansion, contraction &
construction joints in building structure
such as Basements, subways, retaining
walls, floors, external walls and claddings
of high-rise buildings, roof terraces
& ceilings especially structural expansion
joint running through the ceiling.
- Sealing of dynamic structural cracks
- Glazing joints of window, door frame
and curtain walls.
- Joints & 'J' bolts of asbestos
sheet roofing.
- Sealing of water retaining structure
joints such as Water tank, reservoir,
dams, aquaducts, canals, culverts and
water treatment plant.
- Sealing of joints in traffic areas
such as Bridges, roads and car parking
areas.
Joint design
In building structures various (different)
types of joints are designed such as Butt
joints, Lap joints, Fillets Joints, Expansion
joints, Control joints and Glazing joints.
As the joint expand, contract or experience
a shear movement, cyclic movements, sealant
changes the shape accordingly, but the volume
of sealant remains same. Hence, in designing
the joints, it is vital that the proper
width-to-depth ratio is specified so that
the width of the joint is consistent with
the capability of sealant to endure daily
and seasonal cycles for prolonged periods.
The amount of movement in a joint is dependent
on the length (span), the coefficient of
linear expansion of a panel section and
the temperature differential of the substrate.
To achieve the long-tem, effective performance
the established width-to-depth ratios are
determined and are given below:-
 |
| Fillet
Joint |
|
Expansion
Joint |
Glazing
Joint |
Control
Joint |
|
|
| Joint
Width |
Depth
of sealant joint |
| |
Concrete
& Masonry |
Metal
& Glass |
| ¼"
to ½" (6.4mm to 12.5mm) |
¼"
minimum (6.4mm) |
¼"
minimum
(6.4mm) |
| ½"
to 1" (12.5mm to 25.4mm) |
Width
2 |
Width
2 |
Over 1"
(25.4mm & above) |
½"
maximum
(12.5 mm) |
½"
maximum
(12.5 mm) |
|
| |
Direction
for use
Surface Preparation
1. Surface preparation is the most important
step before application of sealant to get
best results and to avoid failure.
2. The Joint surface must be dry, free from
dust, coatings, bituminous mastics, concrete
curing agents, mould release agents, oils,
greases and loose particles.
3. Clean the joint surface by wire brush and
sanding with emery paper.
4. Remove dust by compressed air or paint
brush.
5. Wipe out oil and grease by solvent soaked
cloth (such as Xylene, Toluene or Acetone.)
Back up materials
Insert compressible polyethylene, polyurethane,
thermocolfoam neoprene, polyethylene butyl
rods as back-up material to control depth
of sealant in the joint and to provide support
for tooling of the sealant.
Priming
Select a primer suitable to the substrate
and apply two coats by brush on the sides
of the joints surface at an interval of 30
minutes.
- Primer RDL 942 : For porous substrate
such as concentrate, wood etc.
- Primer RDL 947 : For non-porous substrate
such as metals, glass etc.
- Primer RDL 952 : For acrylic glass
- Primer RDL 948 : For PVC plastic &
rubber
Bond breaker
Fix bond breaker tape such as self adhesive
polyethylene tape on back-up material to
avoid adhesion of sealant to the third surface.
Masking tape
Apply masking tape such as self-adhesive
polyethylene, cellophane or cloth tape on
both edges of the joint. It is used to improve
the neatness of the finished seal by protecting
the face edges of the joint. It may be removed
immediately after tooling of the sealant.
Mixing
The base and accelerator compounds supplied
are packed in pre-weighed quantity as per
the mixing ratio. After the application
of primer, mix the material of individual
container. Transfer entire quantity of accelerator
to the base compound tin and mix it thoroughly
to a uniform, homogenous grey colour. Mixing
can be done manually with spatula / palette
knife or special flat stirrer attached to
a low speed electric mixer less than 500
r.p.m.
Application
Apply the mixed Gun grade compound by means
of a spatula or by filling into a plastic
cartridge which is then placed into the
hand held caulking gun into the joint.
Tooling and finishing
It is desirable that a smooth surface is
obtained. Tool the sealant by pressing the
puffy knife or flat tool against the sealant
surface, moving along the length of the
joint. Tooling breaks air bubbles and exposes
any air pockets present. Tooling compresses
the sealant, thus promoting adhesion to
the joint sides. After tooling the masking
tape should be removed immediately. Soap
solution can be used to smoothen the sealant
surface.
Coverage
Sealant : To estimate the quantity of TECHSEAL
required to seal the joint can be very easily
estimated by using the following formula
:
i) RDL-940-L = 650
(W
X D)
ii) RDL-941-L = 625
(W
X D)
Where,
L = Length of the joint in linear running
meter
W = Width of the joint in mm.
D = Depth of the joint in mm.
Primer : 1 lit. of primer is required per
15kgs. of Techseal.
Cleaning of tools & equipment
Tools and equipments can be easily cleaned
with solvent such as Xylene, Toulene, Methyl,
Ethyl, Ketone and Acetone.
Storage and shelf life
Store the material at cool and dry place
( at 25ºC temp. & 50% RH). Shelf
life is one year in unopened containers.
Packing
Techseal : 1 kg, 4 kgs.
Primer : 100 ml, ½ litre 1 litre
Specification Complies
BS 4254-1983 : British Standard Specification
TT-S-00227E : National Bureau of Standard
(GSA)
C-920-87 : American Society for Testing
& materials (ASTM)
DIN-18549 : German Standard Specification.
Precautions
- Some people are sensitive to resins,
hardeners, solvent and its vapours so
it is advisable to use hand gloves and
goggles.
- Avoid application below 10ºC temperatures.
- Avoid application and damp or moist
substrate.
- Storage - store at cool & dry place.
- Ensure that two coats of primer are
applied on the jointing surfaces
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