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    Nylon and polyamide plastics are used in various high-demanding applications ranging from electronics and electrical tools to aircraft components to under-the-hood automotive parts. Polyamide applications typically require high heat stabilization and impact resistance to meet long-term stability and high-performance expectations.

The SI Group portfolio of antioxidants and UV stabilizers is designed to improve nylon and polyamide materials' stability, performance, and impact resistance in a variety of applications. Polyamides require long-term heat stabilization, especially in electrical and automotive under-the-hood molded articles. Thermoplastics like polyamide compounds and nylon require high-performance stabilization to protect against thermal and UV degradation. 

Explore your desired functionality and solutions for Polyamide and Nylon:

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Polyamide and Nylon Solutions

Copper iodide is a commonly used stabilizer in nylon and polyamide thermoplastics, but it typically causes copper plate-out, corrosion, and dark colorations in addition to its environmental concerns. SI Group offers a broad range of antioxidants and UV stabilizer additives designed to meet your specific molding and extrusion applications.

High-demanding heat stabilization applications:

NAUGARD™ 445 and FLEXAMINE™ antioxidants are excellent alternatives to traditional copper iodide systems, offering long-term heat stabilization without causing corrosion issues, especially in electronics and automotive thermoplastics.

Polyamide (polyamide 6 and polyamide 66) white goods:

A combination of LOWINOX™ HD98 and ULTRANOX™ 626 is recommended. LOWINOX™ HD98 is a primary phenolic antioxidant that offers excellent compatibility with polyamide compounds, and ULTRANOX™ 626 is a high-activity phosphite secondary antioxidant that optimizes color and heat stability for extended protection

Polyamide (polyamide 11 or polyamide 12):

A combination of LOWINOX™ GP-45 or LOWINOX™ 44B25 (phenolic primary antioxidants) and ALKANOX™ 240 (a phosphite secondary antioxidant) is recommended for polyamide 11 and 12 polymers.

Polyamide fibers and tire cords:

LOWINOX™ 44B25 or LOWINOX™ GP-45 phenolic antioxidants are recommended for polyamide resin fiber-reinforced applications as they offer the required protection at high-temperature spinning operations. LOWINOX™ 44B25 is also used to protect the spin finishes from degradation when applied to the hot fibers.


Tensile Strength Retained


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Impact Resistance and Modification

Royaltuf Impage

ROYALTUF™ is a family of chemically modified EPDM rubber engineered to improve the impact resistance of nylon-6 and 6/6 compounds. ROYALTUF™ products are generally added to nylon compounds at 5% to 20% by weight, directly at the compounding extruder. They improve toughness, strength, and impact modification properties in temperature-critical nylon applications. They also offer the following: 


  • 15X higher impact strength 

  • Outstanding low-temperature impact performance

  • Significantly improved toughness and dimensional stability

  • Reduced waste and better recycling performance

  • Enhanced impact performance of recycled resins

Royaltuf 485 Impact

The graph shows the impact improvement using ROYALTUF 485 in nylon 6,6 and in nylon 6/6 alloys with polypropylene (PP). It also improves impact performance in recycled resins and other thermoplastic compounds.




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Coupling and Compatibilization

POLYBOND™ coupling agents are used as compatibilizers in nylon (PA), polypropylene blends, and alloys. The coupling agents reduce the domain size of the two polymers, resulting in increased tensile strength and improved flexural properties and impact resistance.


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The scanning electron micrographs show the morphology of two PA/PP alloys with and without the addition of POLYBOND™ compatibilizer at 2.5%. The improved dispersion and reduced phase sizes offer superior performance and enhanced strength to the alloy parts. 

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UV Stabilization and Resistance


Polyamide and alloy materials are commonly used in outdoor applications. They are typically pigmented and exposed to hot climates, requiring long-term UV and light stabilization. Light and UV stabilizers with low volatility are highly recommended for extended protection in such applications.

A combination of LOWILITE™ 28 UV absorber, and LOWILITE™ 62 HALS or LOWILITE™ 94 HALS provides effective stabilization in a wide array of polyamide plastic outdoor applications.

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