Polyurethane waterproof concrete sealant Types: 1K, High-Modulus, Low-Modulus & Self-Leveling

Selecting the right polyurethane sealant caulk can prevent many on-site construction issues. An incorrect choice can lead to problems such as sagging in vertical joints, slow curing, or cracking and debonding following joint movement. Even if a sealant possesses excellent adhesion properties, issues may still arise if it is incompatible with the joint or the application method.

How Different Polyurethane Waterproof Concrete Sealant Types Compare

1K Polyurethane Sealant	Ready to use with no mixing. It cures with moisture in the air, making it convenient for on-site application.	Concrete joints, construction joints, window installation, and automotive glazing.	Cure time under the actual temperature, humidity, and joint depth.
High-Modulus Polyurethane Sealant	Firmer and more resistant to deformation. A good choice when a stronger, more rigid seal is needed.	Applications requiring a firmer seal or stronger bonding support.	Joint movement, hardness, adhesion, and joint design.
Low-Modulus Polyurethane Sealant	Softer and more flexible, allowing the sealant to move with the joint with less stress.	Concrete expansion joints, façade joints, and other movement joints.	Expected joint movement, elastic recovery, and joint width.
Self-Leveling Polyurethane Sealant	Flows after application and settles into a smooth, even seal.	Horizontal concrete joints, floors, pavements, and slabs.	Joint depth, slope, backing material, and flow control.
Non-Sag Polyurethane Sealant	Holds its shape after application, so it stays where you put it.	Vertical, inclined, and overhead joints.	Sag resistance, tooling time, joint depth, and application temperature.

Polyurethane Sealant Selection by Application

High-Modulus vs. Low-Modulus Polyurethane Sealant

For concrete expansion joints, façade joints, and other moving joints, low-modulus polyurethane sealant is often a suitable choice. High-modulus grades are more suitable when a firmer seal and stronger resistance to deformation are required.

Self-Leveling vs. Non-Sag Polyurethane Sealant

Self-leveling grades are mainly used for suitable horizontal joints, such as concrete floors, pavements, slabs, and other flat surfaces. Non-sag grades are designed for vertical, inclined, and overhead joints.

Recommended Polyurethane Sealants for Construction Projects

Tengyu offers different polyurethane sealant grades for concrete joints, expansion joints, waterproofing, and other construction applications. Choose the right grade based on joint movement, application direction, and sealing requirements.