PU Sealant for Construction

PU sealant is specifically engineered for sealing joints in diverse construction applications. These professional-grade polyurethane formulations deliver exceptional adhesion compatibility, elasticity, and long-term durability. They exhibit strong bonding performance on multiple substrates, especially porous materials such as concrete and masonry. With high bond strength and excellent movement accommodation capabilities, polyurethane sealants are suitable for demanding environments. Additionally, they can be painted over after curing for seamless integration into finished surfaces.

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Product Advantage

Advantage:

Excellent Weatherability for Exterior and Roof Applications

Specifically formulated to withstand UV radiation, rain, and extreme temperature cycles on roofs and other exposed exterior surfaces.

Good Adhesion to Concrete and Effective Concrete Crack Bridging

Provides a tenacious, waterproof bond to concrete, allowing it to effectively span and seal active cracks without losing adhesion.

Accommodates Movement in Expansion Joints with Low and High Modulus Options

Available in both low modulus (for high-movement expansion joints) and high modulus (for structural joints requiring greater strength) formulations to suit specific project demands.

Durable, Elastic Seal for Dynamic Expansion Joints and Roof Joints

Maintains exceptional elasticity and recovery through repeated cycles of expansion and contraction, ensuring a long-lasting seal in dynamic roof and expansion joints.

Technical Parameters

Items	Test Std	Requirement	Typical value
Appearance	/	Black,Grey,White,homogeneous paste	/
Density	GB/T 13477.2	1.45±0.1	1.45
Extrudability(ml/min)	GB/T 13477.4	≥80	440
Sagging properties (mm)	GB/T 13477.6	≤3	0
Tack free time (h)	GB/T 13477.5	≤24	1
Curing speed (mm/d)	HG/T 4363	≥2.0	2.6
Volatile contents (%)	GB/T 2793	≤7	2
Shore A-hardness	GB/T 531.1	40～50	46
Tensile strength(MPa)	GB/T 528	≥1.5	2.5
Elongation at break(%)	GB/T 528	≥400	550
Tensile modulus（MPa）	GB/T 13477.8	＞0.4（23℃）	0.75
Tensile properties at maintained extension	GB/T 13477.10	No failure	No failure
Adhesion/cohesion properties at maintained extension after water immersion	GB/T 13477.11	No failure	No failure
Adhesion/cohesion properties at variable temperature	GB/T 13477.13	No failure	No failure
Elastic recovery rate%	GB/T 13477.17	≥70	80
Operating temperature(℃)	/	-40~90

Product Uses

Application:

Structural and Panel Joints: Ideal for sealing joints in pre-cast concrete panels and structural elements. Suitable for areas where low movement, high resistance to penetration and pressure are required.

Industrial Flooring and Pavement Joints: Perfect for heavy-duty applications such as warehouse floors, loading bays, and road pavement joints. Suitable for areas where low movement, high resistance to penetration and pressure are required.

Perimeter Sealing of Foundations and Basements: Effectively seals the joints between concrete foundations and walls against water and soil pressure. Suitable for areas where low movement, high resistance to penetration and pressure are required.

FAQ

Frequently Asked Questions (FAQ)

What is the key difference between your Low Modulus and High Modulus polyurethane sealants?

Low Modulus** sealants are highly flexible and elastic, designed to accommodate significant movement (expansion and contraction) in joints, such as those on roofs and between large concrete panels. They are ideal for dynamic joints.
High Modulus sealants offer higher strength and resistance to penetration and pressure. They are suitable for areas where low movement, high resistance to penetration and pressure are required**, such as industrial flooring, heavy-traffic pavement joints, and structural connections.
How long does it take for the sealant to fully cure, and what factors affect curing time?

Surface skin typically forms in 2-4 hours, depending on temperature and humidity. However, full cure through the entire bead can take 24 to 72 hours. Curing time is significantly affected by ambient temperature, humidity, and the joint's depth/width. Lower temperatures and higher humidity will slow down the curing process.
What surface preparation is required to ensure optimal adhesion?

For a permanent, waterproof bond, surfaces must be completely clean, dry, and free of dust, oil, grease, laitance (on concrete), and old sealant residue. We recommend mechanical abrasion (e.g., grinding, wire brushing) for concrete and using a compatible primer on specific substrates if advised in the technical data sheet.
Is the cured sealant paintable, and what type of paint should I use?

Yes, most of our professional-grade polyurethane sealants are paintable after full cure. We recommend conducting a compatibility test with the specific paint system you plan to use. Generally, elastomeric (flexible) acrylic or urethane-based paints are most compatible, as they can move with the sealant without cracking.