Low-Temperature Flexibility and Crack Resistance in Modified Asphalt

Thermal cracking remains one of the common failure modes in asphalt pavements, particularly in regions with large temperature fluctuations. SBR-modified bitumen systems are widely adopted to address this challenge, and the ultra-low glass transition temperature of RF-7663 and RF-7664 plays a central role in this performance improvement.

With a Tg of approximately –50°C, these SBR latexes maintain elasticity even under cold conditions. This allows the modified bitumen to accommodate thermal contraction without developing brittle fractures. For civil engineers, this translates into longer service life and reduced maintenance frequency.

Low-temperature flexibility also contributes to improved stress relaxation. When pavements are subjected to repeated thermal cycles, elastic polymer domains absorb and dissipate stress, preventing crack initiation and propagation. This is particularly important for bridge decks, airport runways, and high-altitude roads.

From a materials engineering perspective, the butadiene-rich polymer backbone provides resilience, while the styrene segments contribute structural strength. This balanced molecular architecture ensures that flexibility does not come at the expense of load-bearing capacity.

For procurement teams evaluating lifecycle cost, improved low-temperature performance directly reduces long-term repair expenses. Fewer cracks mean less water ingress, slower degradation, and improved overall pavement integrity.

Trade partners supplying infrastructure materials to cold-climate markets benefit from offering SBR latex solutions with proven low-temperature performance. It simplifies specification approval and enhances competitiveness in technical tenders.

Ultimately, low-temperature flexibility is not just a performance metric—it is a key contributor to pavement reliability and safety.

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