Polyurethane waterproof coatings arr_right_inav

One-Component Polyurethane Waterproof Coating

Description Specifications Scope of Application FAQ Download

Description

YHPUcoat-8118 is a waterborne coating with waterborne polyurethane dispersion as the main film forming material, with additives, pigments and fillers, etc., which is mixed in a vessel. It has excellent Long-term water resistance, while both have excellent mechanical properties of oily polyurethane waterproof coating and environmental-friendly performance of waterborne waterproof coating.

Specifications

**Packing and Specifications**
Item	Description
Nature	One Component
Appearance	Viscous Liquid
Color	4 colors
Density / (kg/L)	1.4-1.6 kg/L
Solid Content by Weight	63-68 %
Package	Plastic drum
Packing Size	20 kg per drum

**Typical Properties and Characteristic**
Description	Test Methods	Typical Values
Tensile Strength	ASTM D412	2.5 MPa
Elongation at Break	ASTM D412	650 %
Tear Strength	ASTM D624	20 N/mm
Pull-off Adhesion to Concrete	ASTM D7234	1.5 MPa
Shore A Hardness	ASTM D2240	60-65
Pull-off Adhesion to Concrete / MPa	ASTM D7234	1.8±0.4
Shore A Hardness	ASTM D2240	60-65
Water Penetration Test (5 bar, 3 days)	DIN 1048-5	No Penetration
Water Vapor Transmission	ASTM E96	0.50 g/m2·h
Low Temperature Flexure (-35℃)No Cracks	ASTM D522	No Cracks
VOC g/L	ISO 11890-2:2020	0

Application Information

Materials Consumption

Material consumption depends on the porosity and texture of the substrate. Typically, it is approximately 2.2–2.6kg/m² for a 1 mm dry film thickness.

Application Instructions 

· General Requirements: The construction temperature should be between 5°C and 35°C. Outdoor construction is prohibited on rainy and snowy days.



· Substrate treatment: The substrate should be flat, solid, clean, free of visible water, floating ash, andoil stains. The substrate should be wetted sufficiently, but without standing water. 

· Detailing: Apply additional layers to detailed areas such as internal and external corners, pipe roots, and drainage outlets in 2-3 coats. Sandwich reinforcing materials between the coats to ensure thewaterproof coating fully penetrates the tire layer without wrinkles or edges. 

· Coat application: Apply the large surface waterproof layer first to the facade, then to the flat surface,in 2-3 coats. The next coat can only be applied after the previous one is dry, and the painting directionshould be perpendicular to the previous direction. 

· Construction of protective isolation layer: Under humid environmental conditions, the drying speed ofthe product will slow down, and the drying time should be appropriately extended. After thewaterproof layer is completely dry, subsequent construction can proceed according to the designrequirements (such as protective isolation layer construction, tile laying, etc.).

Features & Benefits

· Odorless, and low VOC content. 

· Excellent durability. 

· Excellent physical and mechanical properties: compatible with solvent-based polyurethane. 

· Good bonding property and strong adhesion to various substrates. 

· Excellent water and corrosion resistance. 

· Excellent low-temperature flexibility. 

· Easy to use.

Scope of Application

Suitable for new buildings and refurbishment projects without exposed waterproofing requirements, such as bathrooms, kitchens, pools, etc.

FAQ

Q1: What is the advantage for liquid applied membrane (coating)?

It is suitable for various type of structures and substrates, it can form seamless membrane without joint (seams and joints are the most vulnerable to leakage), and is beneficial for complex structures. The liquid coatings has various functions, sucha as flexible, high strength, excellent abrasion resistance, high load bearing property, and breathable capability, etc.
Q2: What is the difference between one-component polyurethane and two-component polyurethane?

Firstly, the isocyanate group in one - component polyurethane reacts with moisture to form a membrane. Two - component polyurethane has two parts: one part is isocyanate, and the other part is polyol or polyamine, and these two components react with each other to form a membrane. Secondly, due to the difference in the reaction mechanism, the sensitivity to atmospheric conditions is also different. For one - component PU, high moisture and temperature can increase the reaction speed. In contrast, two - component PU has better storage stability, and its reaction speed is hardly affected by moisture.
Q3: Why should the polyurethane coating be used up as soon as possible after opening the container?

Because moisture in the air can enter the container and cure the remaining coating inside.
Q4: What are the differences between sag - resistant PU and levelling PU?

Sag-resistant PU has rheological properties. Rheology is the study of the behavior of materials during "flow" or "deformation" processes. There are several common "rheological behaviors" from the molecular level: 1) Shear thinning,This is the most common type of non - Newtonian behavior. It means that when you apply a shear force to the material (such as stirring, scraping, extruding), the viscosity of the material will decrease. ; 2) Thixotropy: Thixotropy is an "upgraded version" of shear thinning, with an additional dimension: time. Its definition is: During the continuous shearing process, the viscosity of the material will gradually decrease with time; after stopping shearing, it can gradually recover the original viscosity. This ability of "temporarily becoming thin + reversibly recovering" is exactly thixotropy. Materials with good thixotropy can "flow smoothly" during construction, but can quickly recover viscosity to avoid "collapse" and "sagging". For the sag-resistant coating, it is easy to scrape and apply during construction, and does not sag when left standing, ensuring the bonding thickness.
Q5: Can polyurethane coating be used for indoor construction

Yes, the non-solvent polyurethane and water-based polyurethane can be used for indoor waterproofing applications. Non-solvent polyurethane is a high-solids, ultra-low VOC coating, especially suitable for areas with poor ventilation and sensitivity to odors or volatiles.