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    The SI Group is a global leader in manufacturing antioxidants, UV stabilizers, and compatibilizers that provide long-term protection for challenging applications. Thermoplastic Polyolefin (TPO) roof membranes are some of the fastest-growing commercial roofing applications. Furthermore, the SI Group's portfolio of solutions offers the building and construction industry innovation and protection for peak performance. 

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A broad class of roofing materials is now made from Thermoplastic Polyolefins (TPO) to meet today's demanding building and construction applications. Unlike historically used EPDM membranes, TPO products are typically light in color and can reflect heat away from the building, decreasing cooling costs in the summer.


TPO roof membranes are heat-weldable, so seams are more potent and longer lasting. Unlike PVC roofing, TPO is eco-friendly and fully recyclable. TPO roof membranes are also cost-effective, exhibiting high resistance to puncture, impact, and tearing.


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TPO membrane roofing applications are not without their shortcomings and significant challenges in enduring the high heat and UV loads to which most commercial roofs are exposed. Therefore, it is critical to incorporate a robust and proven stabilization package from the SI Group into your TPO formula.


The SI Group portfolio of antioxidant and UV stabilizer solutions below are used in various building and construction applications depending on your formulation needs and end-use.  


SI Group Antioxidant and Stabilizer Solutions for Membrane Roofing

    ALKANOX™ Phosphite AntioxidantsAntioxidantAn Organo-phosphite antioxidant that exhibits excellent hydrolytic stability; Effectively reduces peroxide induced oxidative degradation during processing, including at high temperatures
    ANOX™ Binary Blend AntioxidantsAntioxidantSolid binary synergistic blends used to protect polymers during high temperature processing and long term aging; Non-Dusting Blends are compact, often customized, cost-effective antioxidant blends
    ANOX™ Hindered Phenolic AntioxidantsAntioxidantProvides very low volatility and excellent resistance to extraction from polymer compounds.; Particularly effective against degradation during long-term aging, but can also be an effective process stabilizer and exhibit good discoloration resistance
    LOWILITE™ Benzotriazole UV AbsorbersUV StabilizerBenzotriazole and Benzophenone UV Absorbers; Ideal for UV resistance in a variety of polymer systems
    LOWILITE™ Hindered Amine Light StabilizersUV StabilizerHindered Amine Light Stabilizers; Maximizes color yield in pigmented systems, improves resistance to acidic conditions, and does not migrate easily
    LOWINOX™ Hindered Phenolic Specialty AntioxidantsAntioxidantAntioxidants that provide low volatility and excellent resistance to extraction from polymer compounds, allowing exceptional processing and end-use stability
    LOWINOX™ S-Bridged Phenolic Specialty AntioxidantsAntioxidantSulfur containing secondary stabilizers that are non-discoloring and non-staining
    NAUGARD™ Metal DeactivatorsAntioxidantUnique antioxidant that includes metal deactivation; May be used where there is interference from metallic ions such as from residual polymer catalyst, inorganic pigments, or mineral filled polymers
    NAUGARD™ Thioester Specialty AntioxidantsAntioxidantAuxiliary stabilizers used to promote long term ambient aging properties and allow for excellent color and processing
    ULTRANOX™ Solid Phosphite AntioxidantsAntioxidantFeatures a higher phosphorus content than competitive phosphite antioxidants, offers high performance even at low loading levels for a more cost effective formula
    WESTON™ Liquid Phosphite Ester AntioxidantsAntioxidantHigh-purity secondary stabilizer additives for PVC systems
    WESTON™ Solid Phosphite AntioxidantsAntioxidantHigh-purity phosphite antioxidants are effective heat, color, and viscosity stabilizers that create additional synergies when paired with hindered phenols



The SI Group polymer additives for membrane roofing improve aesthetic and physical properties that help prevent potential cracks and leaks. Talk to a technical specialist about which SI Group product works best for your formulation. 


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