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Trubuild

Overview Usage Product Specifications Handling Precautions

TRUBUILD TRU PU

Waterproofing Membrane

TRU PU is a single component waterproofing Liquid membrane, elastomeric membrane, it is bitumen modified polymer PU based waterproofing system. PU waterproofing membrane gives excellent barrier to building facades from vapour, salts and water

Applications

Waterproofing of wet areas, foundations, basements, terraces, retaining walls, inverted roofs etc
For waterproofing terrace garden and podium
Other roof structures when protected from exposure to direct sunlight, for longer life

Advantages

TRU PU is a single component liquid system and very easy to apply
High elasticity ensures a permanently flexible barrier over a wide range of temperatures
Outstanding resistance to oxidation and brittlement
Gives better adhesion. Can be applied to a range of substrates
Good crack bridging capacity up to 2 mm
Good retention capacity

How to use

Clean the surface by manual & mechanical means, remove all the loose material or previous work done, make it free from any type of contaminants like oil, sand, debris etc
Prime the surface with max. 20% water adding to Tru PU. Mix it till it becomes Homogeneous, then apply by brush or roller to the surface. The coverage will be approx. 80-90 sq ft per Kg. The coverage will depend on the substrate condition.
Tru PU undiluted should be applied direct by brush to obtain a continuous unbroken film
Two coats are required, second coat should be applied at right angles after the first coat has cured properly
It must be protected from mechanical damage during construction or backfilling works
Any damage may be repaired by spot application
If a water flood test is to be run, the membrane should cure for a minimum of 10 days
Tru PU is resistant to frost but adhesion will be weak if it is applied to frosted substrates/surfaces
Application should be avoided if substrate temperatures are below 5ºC or rain forecast. For any further technical information please contact the Astral Technical Services Department

TECHNICAL DETAILS

PROPERTIES	STANDARD	RESULTS
Appearance	In House	Viscous Liquid
Colour	In House	Black after Drying
Specific Gravity at @25°C	IS:101 (P-1/S-7):1987	1.07 ± 0.02 g/cm³
Viscosity at @25°C	ASTM D 2196	10000 ± 2000
Cure Time		24 Hour approx. (Complete Curing 7 to 10 days)
Tensile strength at Break	ASTM D 412	>1.5 N/mm²
Elongation at break	ASTM D 412	≥ 600 %
Crack Bridging	InHouse	Up to 2mm
Shore A Hardness	InHouse	35 - 45
WFT	LDM	1000 – 1200 micron
DFT	LDM	500 – 600 micron

Coverage

1 sq mtr @ 1.1 to 1.2 kg of Tru PU in 2 Coats
Coverage Depends on type of Substrate and its porosity

Shelf Life

12 months from the date of manufacturing.

Storage

Product should be stored in a dry place in their original, properly closed containers at temperature between 2-40°C. Partially emptied container should be closed immediately.

Packing

Bottle:
1 kg & 20 kg

Handling precautions

Mandatory and recommended industrial hygiene procedures should be followed whenever our products are being handled and processed. For additional information please consult the corresponding product data sheets and the brochure “Hygienic precautions for handling plastics products”.

Limitation

For Primer, the product should be diluted with water (20% maximum by weight, i.e. 4 kg of water for 20 kg of TRU PU at site to achieve a workable consistency)
Water ponding test shall be done only, once the coating is fully cured for 10 days
After full cure, This Product will be slightly tacky, hence it is recommended to use a separation layer such as geotextile or PE sheet, Then cover with a protection screed
Outgassing is a naturally occurring phenomenon of concrete that can produce pinholes in subsequently applied coatings. The concrete must be carefully assessed for moisture content, air entrapment, and surface finish prior to any coating work. Installing the coating either when the concrete temperature is falling or stable can reduce outgassing. It is generally beneficial, therefore, to apply the embedment coat in the late afternoon or evening
For optimum application, do not allow liquid TRU PU to be heated by direct sunlight or other heat sources
Not suitable for permanent water immersion, hence not recommended for water-retaining structures such as RC tanks, swimming pools, water features, etc.
The 1st coat and 2nd coat of TRU PU should be applied without any dilution & only primer need to be diluted.
During the curing process micro bubbles are formed. This is a product characteristic, which does not affect the protective properties. For this reason, it should be ensured that the material is not applied at excessive film thicknesses in one layer. Excessive film thickness may create bubbles
The product can be applied by brush, roller or airless spray. Work well with a brush in difficult areas. Apply subsequent layers 24 hrs after the application of first layer
If TRU PU has been exposed to UV light, its colour will be changed to yellow slightly without losing its physical properties but flow is possible due to temperature of sun light in open to sky condition.
It is recommended to use a reinforced coating system with 45 gsm fleece or fibre net specially on the Joints/corners etc to increase its tensile property. however, the performance of a standard coating system is also excellent
A screed needs to be laid on the finished system

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