Typical Characteristics

Characteristics

• Cures at ambient temperatures to a tough, elastic and flexible rubber like material.
• Bonds strongly to most of the building material with the use of recommended primer.
• Durable, remains unaffected by UV rays, ozone and weathering conditions.
• Resist to water, salt water, 10% dil. acids expect nitric acids, alkalies, most of the common chemicals, vegetable, lubricants, oils and fuels.
• It performs well in a temperature range from -40°C to 80°C intermittent.
• 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.
• Resilient recovers the original width after expansion & contraction without the loosing the surface bond.
• Excellent repairability property.
• Tt can be overcoated by waterproofing compounds.
• Non toxic, Fuel Resistance, Fire Resistance.
• Sealants will not cause staining to concrete masonry or stones.

Application

• Sealing of expansion, contraction & construction joints in structure such as,
• Concrete pavement, highways, runways, airfields, and petrol pumps.
• Areas, which are affected by fuel, oil, fire etc.
• Extreme temperature regions.
• Sealing of water retaining structure joints such as,
• Water tank, reservoir, aqua ducts, canals, culverts and water treatment plant.

Sealant Applied at Mumbai-Pune Expressway

Typical Joint Filled with Techseal 941 EH

Directions for use

Surface Preparation

• Surface preparation is the most important step before application of sealant to get best results and to avoid failure.
• The joint surface must be dry, free from dust, coatings, bituminous mastics, concrete curing agents, mould release agents, oils, greases, and loose particles.
• Clean the joint surfaces by wire brush and sanding with emery paper.
• Remove dust by compressed air or paint brush.
• Wipe out oil and grease by solvent soaked cloth (such as xylene, toluene, acetone).

Back up materials
Insert compressed polyethylene, polyurethane, thermocol foam, neoprene, polyethylene, butyl rods as a back up material to control depth of sealant in the joint & provide support for tooling of the sealant.


Primer Application
Select a primer suitable to the substrate and apply two coats by brush on the sides of the joint surface at an interval of 30 minutes.

PRIMER RDL 942 : For porous substrate such as concrete, wood etc.
PRIMER RDL 947 : For non porous substrate such as metals, glass etc.


Bond breaker
Fix bond breaker tape such as self adhesive polyethylene tape on the 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 the accelerator compounds supplied are packed in pre-weighed quantity as per mixing ratio. After the application of primer, mix the material of individual container.

Transfer the entire quantity of accelerator to the base compound tin and mix it thoroughly to a uniform, homogeneous mix. Mixing can be done manually with spatula or by using a flat stirrer attached to a slow speed electric drill. Less than 500 rpm.


Application
After mixing the two components, the mix is suitable for pouring directly from the container into the joints. This grade level itself to form a smooth and clean surface.


Tooling & Finishing
Tool the sealant by pressing the puffy knife against the sealant surface, moving along the length of joint. Tooling is necessary to remove voids, ensure good wetting of interfaces and give neat aesthetic appearance.
After tooling, the masking tape should be removed immediately.


Coverage
To estimate the quantity of Techseal 941 EH required to seal the joint can be very easily estimated by using the following formula,

L =    625   
       W x D

L = length of joint in linear running meter
W = width in mm of joint.
D = depth in mm of joint.

Primer : 1 Litre of primer is required per 15 Kg sealant

Application steps after surface preparation

Cleaning of tools and equipment
Tools and equipment can be easily cleaned with solvents as Xylene, Toluene , Methyl ethyl ketone or Acetone.


Storage and shelf life
Store the material at cool and dry place (at 25°C temperature and 50 % relative humidity). Shelf life is one year when materials are stored in unopened containers as per the recommended storage conditions.


Packing
Techseal 941 EH: 1, 4 Kg (Base & accelerator compounds are packed separately).
Primer : 250ml, 500ml, 1 Litre


Precautions
Some people are sensitive to resins, hardeners, solvents & its vapours, so it is advisable to use hand gloves and goggles.

• Avoid application below 10°C temperature of surface.
• Avoid application on damp or moist substrate as it will create blister formation problem.
• Mixed both compounds thoroughly to uniform and after mix pour the materials within one hour in appropriate primed joints.
• Shelf life of the unmixed material is one year from the date of manufacture.
• Store in cool and dry place.
• Ensure that two coats of primer are applied on the jointing surface V.