Joints in prefabricated buildings must withstand temperature changes, joint movement, rainfall, and long-term outdoor exposure; therefore, sealants require strong adhesion and excellent weather resistance.
MS Polymer Sealants offer a combination of strong adhesion and flexibility, suitable for joints between precast concrete elements and exterior wall panels.
Common Factors in Sealing Precast Building Joints
In practice, joints in prefabricated buildings often face the following issues:
- Panel expand: Temperature changes cause precast panels to expand.
- Long-term Outdoor Exposure: UV radiation, rainfall, and temperature changes can impact sealant.
- Substrate Adhesion: Different surfaces—such as concrete or coated materials.
Key Factors in Selecting MS Polymer Precast Joint Sealant
In engineering projects, the primary focus is usually on substrate adhesion, weather resistance, and joint movement capability.
Substrate Compatibility and Adhesion
Common substrates for precast elements include concrete, coated concrete, and metal. Precast sealant must maintain stable adhesion to these substrates. For specific projects, it is recommended to verify the sealant’s adhesion and compatibility with the actual substrates before application.
Weather Resistance and Outdoor Environments
Exterior wall joints are constantly exposed to UV radiation, rainfall, and temperature fluctuations. Precast concrete panel joint sealants require excellent UV, water, and weather resistance to remain stable under conditions such as high and low temperatures and heavy rain.
Joint Movement and Flexibility
Precast elements are subject to temperature changes and wind loads, causing joints to expand, contract, and displace. Sealants must have sufficient elasticity and movement capability to expand and contract with joint movement, preventing cracking. Common movement classes include ±20%, ±25%, ±35%, and ±50%. For instance, ±25% indicates that the sealant can accommodate a joint width variation of approximately 25%. For joints subject to significant movement, the appropriate movement class select based on joint width and structural movement.
Designed for joints in precast concrete components and modular buildings, Tengyu TM506 MS Polymer precast panel joint sealant is for applications requiring resistance to joint movement and outdoor exposure.
TM506 precast caulking offers excellent adhesion, elasticity, and weather resistance, allowing it to accommodate the expansion and contraction of precast components. It is suitable for sealing joints in precast concrete panels and exterior wall panels.
- High elongation —— Accommodates repeated joint expansion, contraction, and movement.
- Excellent weather resistance —— Suitable for long-term outdoor use; withstands UV radiation, rain, and temperature fluctuations.
- Excellent adhesion —— Bonds well to common construction substrates.
- Retains elasticity after curing —— Reduces the risk of cracking and bond failure.
