Polyurethane waterproof coating

Description

Two Components Polyurethane Waterproof is a synthetic polymer waterproof coating by two components reaction. Component A is a polyurethane prepolymer through the reaction between polyether polyol and isocyanate. Component B is a colorful liquid consisting of plasticizers, curing agents, thickeners, coagulants and fillers.

Where to use

●Undergrounds, cold stores and grade;
●Bathroom, kitchen and pools;
●Hard to dry substrate of underground construction;
●Subways, channels, bridges, tunnels and unexposed roofs;
 
Advantages

●Can be applied on the wet underground substrate with strong bonding power;
●Multipurpose to apply on horizontal planes, vertical planes and top planes;
●Seamless, no pinholes and bubbles;
●Liquid with cold applied;
●Fast solidify and convenient to apply.
Standards

ASTM C 836

Typical properties

Item

Requirement

Test Method

Hardness

≥50

ASTM D 2240

Weight Loss

≤20%

ASTM C 1250

Low temperature crack bridging

No cracking

ASTM C 1305

Film thickness(vertical surface)

1.5mm±0.1mm

ASTM C 836

Adhesion-in-peel after water immersion

175N/m

ASTM C 794

Optional test after adhesion in peel

No separation at surface

ASTM C 836

Extensibility after hear aging
6.4mm(note 1) no cracking

ASTM C 1522

Stability
≥6 months

ASTM C 836

 
Packaging

Component A and B of Two Components Polyurethane Waterproof are sealed in 8kg and 20kg pails, respectively, transported in wooden cases. Each wooden case can be contained 48 pails of component A or 36 pails of component B.

Storage

Two Components Polyurethane Waterproof by sealed pails at dry and well-ventilated placesand protected from sun or rain. The temperature in stored places can not be higher than 40° C. It can not be closed to fire sources. The normal shelf life is 12 months.

Transportation

Two Components Polyurethane Waterproof is needed to be avoided sunshine and rain. Fire sources are forbidden during transportation.

Application System

lConstructive System
The system is basically consisted of substrate, additional layer, waterproof coated membrane and protection layer.

lCoverage
1.7kgper m2 gives dft 1mm minimum. Coverage may vary with the substrate condition during application.

lMixing
The ratio of component A to B is 1:2.5 according to the construction amount.

lApplication Method
Surface preparation

Surfaces should be dry, stable, clean, smooth, without pockmarks or honeycombs and free from any dusts, oil or loose particles. Cracks and surface irregularities need to be filled by sealants and do additional waterproofing. For smooth and stable surfaces, this step can be skipped.

Additional layer

Paint Two Components Polyurethane Waterproof as additional layer to enhance at internal and external corners, drain pipes, floor drains or embedded parts.

Application of waterproof coated membrane

It can use rubber scrapers or spray equipments to paint 2 or 3 times. After fully dry, it can be painted again. The normal time between each painting is 24 hour. The direction of second time painting needs to be perpendicular to the first time painting.

Application of protection layer

After waterproof coated membrane is fully dry and meets quality requirements, it can begin application of protection layer.

Notice

lThe temperature for application of Two Components Polyurethane Waterproof should be above 5℃.
lTwo Components Polyurethane Waterproofhas to be used out as soon as possible and no more than 20 minutes once opened. It can not be exposed to the air for a long time.
lThe storage and application places should be well-ventilated and no fire