TEC POLYSEAL PU
TEC POLYSEAL PU
SEALANT – POLYURETHANE
KEY BENEFITS AND FEATURES
- Ready to use - Single pack, it reduces the failure due to heterogeneity while imperfect mixing.
- Cures by absorption of moisture from air, (no external curing is required) at ambient temperature with humidity.
- Elastic & forms a permanent tough rubber seal.
- Excellent adhesion to concrete, brick work, painted wood, glass, glazed surfaces, aluminum, stainless steel, steel & plastic like polyester & PVC.
- It does not sag or flow down in the joint.
- No staining of cementitious substrates.
- Excellent weather resistance may slightly yellow on long exposure to UV light.
- Accommodates continuous and pronounced cyclic movement and reduces joint failures
- Meets the requirement of ASTM C-920-S, NS, 25 & BS EN ISO—11600: 2003 Type F & G, Class 25 LM standard.
USAGE
- Sealing of expansion and construction joints as well as joints between different construction materials in high rise buildings, basements, floorings etc.
- Sealing joints in between precast concrete panels.
- Sealing Joints in between tiles, bricks, and marble etc.
- Sealing joints of metal container finishing.
- Repairing of non-moving concrete Cracks and control widths.
- Perimeter pointing & curtain wall ceiling.
Joint Size
For various reasons, different types of joints are provided with width depth ratios in different proportions. Depending on the horizontal or vertical movements, the cured sealant should retain its original shape after the deformation of expansion/contraction. So width depth ratio is very important. TECR POLYSEAL PU may be used in any vertical or horizontal joint designed in accordance \ with accepted architectural/engineering practices. Joint width should be 4 times anticipated movement, but not less than 6mm.
WIDTH: DEPTH RATIO
W = Sealant width, D = Sealant depth, C = Contact area.
EXPANSION JOINTS
The minimum width and depth of any sealant application should be 6mm x 6mm. The depth (D) of sealant may be equal to the width (W) of joints that are less than 12mm wide. For joints ranging from 13mm to 25mm wide, the sealant depth should be approximately one-half of the joint width.
WINDOW PERIMETERS
For fillet beads, or angle beads around windows and doors, the sealant should exhibit a minimum surface contact area (C) of 6mm onto each substrate.
| JOINT WIDTH (mm) | WIDTH/DEPTH RATIO (mm) |
|---|---|
| 6 mm to 12 mm | 1:1 |
| 13 mm to 25 mm | 2.1 |
DIRECTIONS FOR USE
Surface Preparations
Surfaces must be sound, clean, and dry. All release agents, existing waterproofing, dust, loose mortar, laitance, paints or other finishes must be removed. This can be accomplished with a thorough wire brushing, grinding, sandblasting or solvent washing, depending on the contamination. If spalled, it should be rectified properly by using TECR POLYSEAL PU MORTOR PE.
Joint Backing
Closed cell or reticulated polyethylene backer rod is recommended as joint backing to control sealant depth and to ensure intimate contact of sealant with joint walls when tooling. Where depth of joint will prevent the use of backer rod, an adhesive backed polyethylene tape (bond breaker tape) should be used to prevent three-sided adhesion. Ensure that all backing should be dry at time of sealant application. Fix a masking tape on both sides of joint surface to get neat & clean appearance of joints after application of sealant.
Priming
Where deemed necessary, use TECR POLYSEAL PU PRIMER and prime only on two sides of the properly prepared joint surface. Apply by brush and allow it cure for minimum 20 minutes. Apply two coats of primer at an interval of 30 minutes. After priming is over, sealant should be filled after minimum 30 minutes and before 90 minutes. If 90 minutes is exceeded a fresh coat of primer should be applied.
Application
TECR POLYSEAL PU is easy to apply with conventional caulking equipment. Ensure that the backer rod is friction fitted properly and any primers have been applied. Fill the joint completely with a proper width-to-depth ratio and tool to ensure intimate contact of sealant with joint walls. Apply slightly in excess for tooling & finishing purpose. Dry tooling is always preferred, although xylene can be used in limited amounts to slick the spatula if needed.
Clean Up
Excess sealant and smears adjacent to the joint interface can be carefully removed with kerosene or xylene or mineral spirits before the sealant cures. Any utensils used for tooling can also be cleaned with kerosene or xylene .
Cure Time
TECR POLYSEAL PU generally cures at a rate of 6 mm depth per day at 32°C. It will skin in 5 hours and be tack free in 30 hours. The cure time will decrease as temperatures and/or humidity increases.
Limitations
- Do not apply TECR POLYSEAL PU over damp or contaminated surfaces and substrates with traces of bitumen.
- Adhesion of the sealant must only be on two opposite faces
- Do not carry out sealing operations during hot weather conditions.
- Use of bitumen board as a back up material should be avoided
- Application to be started only after 30 minutes of priming the substrate
COVERAGE
L x W x D
________ = Volume of material required
1000
(Wastage is not considered) Volume of material required / 0.6 = Number of catridges. Where,
L= Length of the joint in linear meter, W = width of the joint in mm and D = depth of the joint in mm
PRIMER
6 to 8.5 % of the Sealant quantity (May vary depending upon the porosity of the substrate)
Technical Data
| CHARACTERISTICS | SPECIFICATION | TYPICAL VALUE |
|---|---|---|
| Appearance | Homogeneous, highly viscous paste | |
| Color | Grey / White | |
| Density (g/cc) | 1.23 + 0.04 | |
| Skinning time, minutes | 15 – 20 | |
| Tack Free Time, Hrs | ASTM C – 920 | 30 |
| Service temperature range, C | – 30 to + 80 | |
| Slump at 35° angle | Nil | |
| Hardness, Shore A | ASTM C – 920 | 20 – 25 |
| Staining | ASTM C-920 | No staining |
| Adhesion & Cohesion under cyclic movement, cm2 | ASTM C-920 | less than 5 |
| Modulus at 100% elongation, N/mm2 | DIN 53504 | 0.2 |
| Elongation at break, % | DIN 53504 | 500 – 600 |
| Movement Accommodation Factor (%) | +/- 25 |
Storage and Shelf life
TECR POLYSEAL PU shelf life is 12 months from the date of manufacturing. The material should be stored in cool and dry place. Failure to comply with there commended storage conditions may result in premature deterioration of the product or packaging.
Packaging
Available in 600 ml/ 800 gms sausage
OTHER PRODUCTS
Techny manufactures lot more range of other products for construction and repair applications. They include admixtures for concrete, mortars, block making etc, waterproof and damp proof coating systems, Repair and rehabilitations products, Grouts and Anchors, Protective, Decorative and Corrosion prevention coatings, Epoxy Flooring systems, Industrial flooring systems and Tiling aids. For more details refer Separate Product brochures.
Every reasonable precaution is taken in the manufacture of the Techny products to ensure that they comply with high standards of quality. The recommendations and properties of the products are based upon what is believed to be the most reliable information available and are not intended as recommendations which infringe other patents. Although all Techny products are subject to rigid quality tests, no specific guarantee can be given, because results depend not only on quality but also on other factors beyond our control. We therefore welcome consultation in the event of doubt about application performance etc but do not accept any liability either directly or indirectly arising from the use of the products whether used as per its specifications or advice or otherwise. All transactions shall be subject to our terms of sale, delivery and payment. The leaflet supercedes the previous one and any new issue may take place without notice to supercede this edition as and when it becomes necessary.
TECHNICAL DATA SHEET
REVISED – September, 2013
