Rianlon U-pack® UV-703 : A High-Efficiency Light Stabilizer for Long-Term Weatherability

With the rapid growth of new energy vehicles, outdoor plastic products and other applications, polyolefin materials such as PP and TPO are being held to higher standards for weatherability, appearance retention and service life. Under prolonged outdoor exposure in particular, ultraviolet radiation continuously accelerates polymer aging, causing color changes, gloss loss and performance degradation.

Enhancing weatherability while also achieving a low dosage, low odor, resistance to migration and blooming, and high appearance quality has become a key challenge in upgrading premium polyolefin materials. To address this need, Rianlon has launched U-pack® UV-703, a high-efficiency light stabilizer that provides long-lasting protection against UV-induced photodegradation for automotive interior and exterior parts and other outdoor polyolefin products.

Product Overview: A High-Efficiency Light Stabilizer for Long-Term Weatherability

U-pack® UV-703 is Rianlon's upgraded high-efficiency light stabilizer developed from its conventional weather-resistant products. It is particularly suitable for polyolefin materials such as PP and TPO, significantly improving light stability and weathering performance while extending the outdoor service life of products.

The product offers good initial color, excellent compatibility and low odor. It is particularly well suited to automotive interior and exterior parts and other outdoor polyolefin applications requiring long-term weathering performance.

Core Advantages: Balancing Weathering Performance and Material Quality

Low Dosage, Effective Protection

At a lower dosage, U-pack® UV-703 provides outstanding UV durability together with color and gloss retention, achieving an effective balance between cost and performance.

At only 75% of the dosage of UV-3808PP5, U-pack® UV-703 can match or even exceed its light-stabilizing performance.

Good Initial Color

In addition to its low dosage, U-pack® UV-703 delivers good initial color, offering particular advantages in light-colored materials and meeting the dual requirements of premium polyolefin products for weatherability and appearance quality.

In long-term UV-induced photodegradation tests, U-pack® UV-703 demonstrated superior weathering stability. It effectively suppressed color changes while maintaining material performance, confirming its ability to provide long-lasting light-stabilization protection.

No Blooming and Low Odor for Environmentally Friendly Applications

U-pack® UV-703 offers excellent resistance to blooming, effectively reducing the risk of migration and blooming, while also delivering a significantly lower odor. These properties align closely with the stringent environmental requirements for low-VOC/FOG interiors in new energy vehicles. As a compliant alternative designed to address regulatory restrictions affecting conventional light stabilizers, including those associated with the SVHC Candidate List, U-pack® UV-703 also anticipates future upgrades to environmental regulations.

No Adverse Effect on Coating Adhesion

While improving material weatherability, U-pack® UV-703 does not adversely affect coating adhesion, helping automotive interior and exterior parts meet combined requirements for weatherability, appearance and subsequent surface treatment.

Core Applications: Automotive and Outdoor Polyolefin Products

Automotive interior and exterior parts: Used in PP, TPO and other materials to provide long-lasting light-stabilization protection while meeting application requirements for color, odor, blooming resistance and coating.

Home appliances and construction materials: Suitable for polyolefin products that require long-term resistance to light exposure and outdoor environments, improving their weathering performance.

Wires, cables and other outdoor plastics: Helps delay UV-induced material aging in applications exposed to long-term outdoor use.

Rianlon U-pack® UV-703 responds to the global transition toward circularity and higher performance in polymer materials. With its combined advantages of low dosage, low odor and no blooming, U-pack® UV-703 provides long-lasting weathering protection for premium automotive modified plastics and can be further extended to consumer electronics, EV charging stations, outdoor construction materials and other fields, delivering durable weathering solutions for a broader range of polymer materials.

Industry Recognition: U-pack® UV-703 Wins the Innovative Material Award at the DT Innovative Plastics Awards

The 2026 Polymer Industry Annual Conference, hosted by DT New Materials, was held in Hefei, Anhui, on 17-18 September 2026. Focusing on industry trends, breakthroughs in key materials, innovation in emerging applications, and industry-academia-research collaboration, the conference brought together more than 600 executives from global companies and leading scientists, over 50 prominent multinational companies, and more than 100 end-user brands.

Held concurrently, the 2026 5th DT Innovative Plastics Awards industry innovation program was themed Innovation Shapes the Future and focused on new materials, processes, equipment and applications in polymers and engineering plastics. Since its launch in 2021, the program has attracted more than 500 companies across the value chain, including BASF, Covestro and KINGFA, creating an industry innovation platform spanning raw materials, compounding and processing, and equipment manufacturing. Entries are evaluated through a mechanism combining expert review (90%) and online voting (10%), with comprehensive consideration given to the degree of product innovation, technical and market feasibility, economic viability, and industry impact.

In recognition of its product innovation and application value in long-term weathering protection for polymer materials, Rianlon U-pack® UV-703 received the Innovative Material Award at the 2026 5th DT Innovative Plastics Awards.

This award represents industry recognition of the innovative value and application potential of Rianlon U-pack® UV-703. It also demonstrates Rianlon's ability to continuously advance technology and upgrade products in response to the anti-aging needs of polymer materials. Looking ahead, Rianlon will remain guided by customer needs and material application trends, continue to enhance its portfolio of RIANOX® antioxidants, RIASORB® light stabilizers and U-pack® solutions, and deliver higher-value, environmentally sustainable anti-aging solutions for polymer materials worldwide.