PU Based Coatings - Chemsol Polymer

Chemolastic PU

Chemsol Chemolastic PU is a single component PU modified bitumen based elastomeric waterproofing system. Chemolastic PU is easy to apply with roller, brush.

Applications

New roofs
Podium waterproofing
Retaining walls, Wet areas, bridges
Being UV resistant product can also be used for the exposed surfaces.
Refurbishing old membrane system including torch-on membrane.

Features

Single component UV resistant with long term ageing stability.
Cured membrane remain stable even at extreme temperatures (-25oC to 120oC)
Resistant to chlorides and sulphates commonly present in soil.
Easy to apply with brush, roller or squeegee.
Highly elastic up to 900% elongation.
Better adhesion to substrate, hence can be used for wide range of applications.

Method of Application

1. Surface Preparation

Surface should be clean and dry and in sound condition.
All the surface dirt, grease, loose particles should be removed from the surface. And the surface should be washed thoroughly with clean water.
All other previous coatings if any shall be completely removed.

2. New Surfaces

The newly constructed surfaces shall be completely cured before coating application.

3. Cracks and Joint Treatment

All the surface cracks FROM 0 - 5mm shall be opened with a 3mm angle grinder.
The opened cracks shall be cleaned properly and filled with a suitable acrylic crack-filler or PU Sealant.
Cracks more than 5mm should be repaired using polymer modified mortar using Chemfast SBR. With a cement sand ratio of 1:3 and polymer content of 10% by weight if cement. Allow it to cure as required.

4. Pre-Application Testing

Ponding test to be done to identify porous surfaces.
The porous surfaces should be then grouted to remove any porosity in the substrate before coating application.
Post ponding to be done to be certain that the surface porosity is completely removed and the surface is ready for coating application.

5. Priming

Apply priming coat with Chemsol Chemolastic PU 200% water dilution i.e. (40L water in 20L of Chemolastic PU). The priming coat shall give approximate coverage of 8-10 Sqm/L depending upon the surface finish.

6. Application

Mix the bucket contents thoroughly.
The drain outlets need to be properly detailed with the coating with an additional piece of fiberglass mesh as a reinforcement.
Apply 1st coat of Chemsol Chemolastic PU with 20% dilution on the surface with a coverage of 0.33 L/Sqm/Coat all over the surface. Let the coating air dry for minimum 6hrs.
Apply 2nd coat of Chemsol Chemolastic PU at an angle of 90o to the first coat with 20% dilution with a coverage of 0.33 L/Sqm/Coat and let dry for minimum 6 hrs.
For higher performance Glass Fiber reinforcement can be applied between 2 coats of Chemolastic PU.

7. Ponding

Let the system air cure for 7-8 days before pond test.
Ponding shall be done with water not more than 5 cm in height.

Precautions and Limitations

Do not dilute Chemolastic PU with water for coating application beyond recommended dosage.
Keep material closed when not in use.
Corners, joints and repair areas should be treated with two extra coats.
Not recommended for water retaining structures like water tank, swimming pool.
Excessive film thickness may result in microbubbles. This does not affect the film integrity. Excessive film thickness shall be avoided during coating application.
Concrete shall be carefully accessed for the phenomenon of outgassing. Hence it is always recommended that the coating shall be applied late afternoon and evening.
Product being sticky it will attract dust when open to sky. To avoid the same, one coat of acrylic coating is recommended to be applied on the Chemolastic coating.

Technical Information

PROPERTIES	TEST METHOD	UNITS	RESULTS
Solid Content	ASTM D1644	%	>60±2
DFT (recommended)		mm	0.5-0.6
Adhesion	ASTM D 3359	N/mm2	>2
Elongation at Break	ASTM D 412	%	>900
Crack Bridging Ability	AS/NZD 4548.5 : 1999	mm	3 mm
Tensile Strength	ASTM D 412	N/mm2	>1

Theoretical Coverage

Material consumption of 0.33 L/M2/Coat shall be maintained throughout two coats for a standard thickness of 0.5-0.6 mm.

Storage

Chemsol Chemolastic PU shall be placed in a cool and dry place protected from direct sunlight.

Pack Size

1 L, 20 L

Shelf Life

24 months for the date of manufacturing if unopened and stored properly.

Health and Safety

Wash skin with soap and water.
On eye contact wash the eyes immediately and consult a physician if irritation persists.
On ingestion consult a doctor immediately.

Chemolastic White PU

Chemsol Chemolastic White PU is a single component PU based acrylic elastomeric waterproofing system. Chemolastic White PU is easy to apply with roller, brush.