Max Tech--Low Modulus Polyurethane Sealant: Applications and Advantages
- 1034240322
- Jan 19
- 2 min read
A low modulus PU (polyurethane) construction joint sealant is a flexible, durable, moisture-curing sealant designed for construction joints with significant movement, offering excellent elasticity, strong adhesion to various materials (concrete, brick, metal), weather resistance, and often paintability, ideal for expansion joints, precast panels, and horizontal/vertical sealing in buildings, bridges, and tunnels. It provides a soft, rubbery seal that accommodates thermal expansion and contraction without cracking, unlike high modulus sealants that are stiffer.
In concrete joint construction, while high modulus polyurethane sealants have high tensile strength, they are prone to interfacial bond failure, leading to water seepage or cracks. Low modulus single-component polyurethane sealants, with strength lower than interfacial bond strength, maintain a stable and reliable seal despite joint expansion and contraction, making them an ideal sealant for concrete joints.
Advantages of Low Modulus Polyurethane Sealants
Low Modulus: Stretches easily and returns to its original shape (high movement capability, e.g., 25% or more).
One-Component: Ready-to-use, cures with atmospheric moisture (humidity).
Excellent Adhesion: Bonds well to concrete, stone, glass, metal, and more, often without primer.
Durable & Resistant: Withstands weathering, UV rays, temperature changes, and chemicals.
Non-Sag/Thixotropic: Stays in place in vertical or overhead joints.
Paintable: Can be painted after full cure (compatibility test recommended).
Widely Uses
Expansion/Construction Joints: In precast concrete, masonry, and facade elements.
Floors & Pavements: Tunnels, basements, balconies, roads, and runways.
Building Envelopes: Sealing gaps in window/door frames, between different materials.
Low-modulus polyurethane sealants are primarily used for sealing dynamic gaps requiring large expansion and contraction. High elasticity, excellent adhesion, and weather resistance. They are widely used in building curtain walls (especially expansion joints), roads, and bridges. Low-modulus polyurethane sealants are generally easy to apply. They can be applied using a standard caulking gun and are available in a variety of colors to meet different project needs.
Low-modulus polyurethane sealants, with their flexibility, adhesion, and weather resistance, provide a long-term reliable sealing solution for various projects. Tengyu offers a variety of low-modulus polyurethane sealants contact us. now to get the most suitable building sealant solutions
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