Application of LS-770 in Wire and Cable Industry

With the rapid development of power transmission, renewable energy, communication networks, and industrial automation, higher requirements are being placed on the durability and reliability of wire and cable materials.

Outdoor cables are exposed to harsh environmental conditions for long periods, including:

• Ultraviolet (UV) radiation;
• High temperature;
• Oxygen oxidation;
• Humidity;
• Temperature fluctuations.

Without proper stabilization, polymer cable jackets may suffer from:

• Surface cracking;
• Powdering;
• Loss of flexibility;
• Reduction in mechanical strength;
• Shortened service life.

To improve long-term performance, high-efficiency light stabilizers are widely incorporated into polymer cable formulations. LS-770, as a classic low molecular weight hindered amine light stabilizer (HALS), plays an important role in improving the weather resistance and durability of cable materials.

1. Introduction of LS-770

LS-770 is a highly efficient hindered amine light stabilizer (HALS). It is widely used in polymer materials to protect plastics from photo-oxidative degradation caused by long-term exposure to sunlight.

The chemical name of LS-770 is:

Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate

It is also known as:

Light Stabilizer 770 / HALS 770

LS-770 works by forming a stable nitroxide radical cycle, which captures free radicals generated during polymer aging and interrupts oxidation chain reactions.

Due to its excellent stabilization efficiency and compatibility with polymers, LS-770 is widely used in:

• Polyethylene (PE);
• Polypropylene (PP);
• Thermoplastic polyurethane (TPU);
• Thermoplastic elastomers (TPE);
• Modified PVC materials.

2. Chemical Structure, Molecular Weight and CAS Number of LS-770

Basic Chemical Information

Item	Information
Product Name	LS-770
Chemical Name	Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate
Chemical Category	Hindered Amine Light Stabilizer (HALS)
CAS Number	52829-07-9
Molecular Formula	C₂₈H₅₂N₂O₄
Molecular Weight	480.72 g/mol
Appearance	White crystalline powder
Melting Point	Approximately 81-85℃

The molecular structure of LS-770 contains hindered piperidine groups, which provide strong free radical scavenging capability. This unique structure enables LS-770 to provide long-lasting protection against UV-induced polymer degradation.

3. Why LS-770 Is Used in Wire and Cable Materials

Wire and cable products generally consist of:

• Conductors;
• Insulation layers;
• Protective jackets.

The outer sheath is responsible for protecting the cable from environmental damage.

Common cable materials include:

• Polyethylene (PE);
• Polypropylene (PP);
• TPU;
• TPE;
• Modified PVC compounds.

Although these polymers have excellent electrical insulation and processing properties, prolonged exposure to sunlight can accelerate aging.

UV radiation breaks polymer molecular chains and generates free radicals, resulting in oxidation reactions and material deterioration.

LS-770 helps slow down this process and maintains the long-term performance of cable materials.

4. Main Applications of LS-770 in Wire and Cable Industry

4.1 Improving UV Resistance of Cable Jackets

The most important application of LS-770 in the cable industry is improving resistance to ultraviolet aging.

When polymer materials are exposed to sunlight:

Polymer chains
↓
Free radical formation
↓
Oxidation reaction
↓
Molecular chain degradation
↓
Material aging

LS-770 captures these active radicals and reduces oxidation damage.

Benefits include:

• Reduced surface cracking;
• Improved flexibility retention;
• Better outdoor durability;
• Extended service life.

4.2 Extending Cable Service Life

Many cable systems require long-term operation under outdoor conditions, such as:

• Solar power cables;
• Wind power cables;
• Outdoor communication cables;
• Industrial control cables.

By adding LS-770, cable materials can maintain:

• Tensile strength;
• Elongation properties;
• Impact resistance;
• Environmental stress crack resistance.

This improves reliability and reduces maintenance frequency.

4.3 Application in PE Polyethylene Cable Sheath

Polyethylene is one of the most widely used materials in cable manufacturing because of:

• Excellent electrical insulation;
• Good processing performance;
• Chemical resistance.

However, PE materials can degrade under continuous UV exposure.

LS-770 improves PE cable materials by enhancing:

• UV stability;
• Weather resistance;
• Long-term mechanical properties.

It is especially suitable for:

• Outdoor power cables;
• Photovoltaic cables;
• Communication cable jackets.

4.4 Application in PP, TPU and TPE Cable Materials

Polypropylene (PP)

LS-770 improves:

• Light stability;
• Thermal oxidation resistance;
• Outdoor durability.

TPU and TPE Elastomers

Flexible cables require excellent elasticity and durability.

LS-770 helps reduce UV-induced molecular damage and maintains:

• Flexibility;
• Mechanical strength;
• Long-term reliability.

5. Stabilization Mechanism of LS-770

LS-770 protects polymer materials mainly through the following mechanisms:

Free Radical Scavenging

During UV exposure, polymer chains generate alkyl radicals and peroxide radicals.

The hindered amine structure of LS-770 reacts with these active radicals and forms stable intermediates, stopping further oxidation.

Long-Term Regeneration Effect

Unlike traditional additives, HALS materials can regenerate during the stabilization cycle, allowing continuous protection over long periods.

Synergistic Effect with Other Additives

In high-performance cable formulations, LS-770 is often combined with:

LS-770 + UV Absorber

Advantages:

• Reduces UV penetration;
• Provides surface and internal protection.

LS-770 + Antioxidant

Advantages:

• Improves processing stability;
• Enhances thermal aging resistance.

6. LS-770 Application in New Energy Cable Industry

With the rapid growth of renewable energy, demand for high-performance cable materials continues to increase.

Solar Photovoltaic Cables

Photovoltaic cables are exposed to:

• Strong sunlight;
• High temperature;
• Temperature cycling.

LS-770 improves:

• UV resistance;
• Weather durability;
• Long-term reliability.

Wind Power Cables

Wind turbines are commonly installed in:

• Coastal areas;
• High-altitude regions;
• Strong wind environments.

Cable materials require excellent aging resistance.

LS-770 helps maintain performance under severe outdoor conditions.

Electric Vehicle Charging Cables

EV charging cables require:

• Flexibility;
• Weather resistance;
• Long service life.

LS-770 is suitable for TPU and TPE cable compounds to improve outdoor durability.

7. Recommended Usage Level of LS-770

LS-770 is highly efficient and normally used at relatively low concentrations.

Typical dosage range:

0.1%-1.0%

The optimum dosage depends on:

• Polymer type;
• UV exposure level;
• Operating environment;
• Required service life.

For high-performance cable applications, a combined stabilization system is often recommended:

LS-770 + UV absorber + antioxidant

This combination provides enhanced protection against UV radiation and thermal oxidation.

8. Conclusion

LS-770 is a highly efficient low molecular weight hindered amine light stabilizer with:

• CAS Number: 52829-07-9;
• Molecular Formula: C₂₈H₅₂N₂O₄;
• Molecular Weight: 480.72 g/mol.

Due to its excellent free radical scavenging ability, LS-770 significantly improves the UV resistance, weatherability, and long-term stability of wire and cable materials.

In PE, PP, TPU, and TPE cable systems, LS-770 helps prevent aging, cracking, and loss of mechanical properties, making it an important additive for modern high-performance cable applications.

With increasing demand for photovoltaic cables, wind power cables, electric vehicle charging cables, and smart grid systems, LS-770 will continue to play an important role in improving the reliability and service life of advanced cable materials.