XT-8 High Molecular Weight NOR Light Stabilizer

Key Advantages

Product Description

Tiangang® XT-8 is a high molecular weight N-OR (NOR) hindered amine light stabilizer based on NOR technology, effectively protecting agricultural films against the degradation caused by sulfur compounds and other agrochemicals. Its unique structure does not interact with acidic substances, delivering stable performance in harsh environments with acid rain, pesticides, insecticides and herbicides. It solves the premature failure of conventional light stabilizers in acidic conditions, significantly extending greenhouse film service life, reducing grower costs and cutting waste.

Features

• High molecular weight N-OR (NOR) structure
• No interaction with acidic substances; resists sulfur 3000–7000PPM and chlorine ≤850PPM
• 38-month greenhouse field trial with over 50% mechanical property retention
• Low basicity, low migration, good processing compatibility
• Can be used alone or combined with Tiangang® HS-625

Comparison vs a reference NOR grade (371 type)

Applications

• Greenhouse films
• Mulch films
• Agricultural non-woven fabrics
• Artificial turf
• Other agricultural plastics exposed to pesticides or acidic substances

Recommended Dosage

Greenhouse films 0.2% – 1.6%, mulch films 0.2% – 1.0% (reference range for NOR-type stabilizers). The exact dosage should be determined experimentally based on film thickness, service life, region and pesticide usage.

Compliance & Certification

• CAS number registered with the Chemical Abstracts Service
• REACH registered, TSCA registered
• High molecular weight HALS developed and manufactured in China

How the whole film formulation fits together

One grade rarely tells the whole story. Greenhouse film is usually three-layer co-extrusion: the outer layer carries the UV package, the middle layer holds mechanical strength, the inner layer faces sulfur and chlorine. Mulch film is only 8–15 µm thick, so mechanical integrity and controlled degradation must be met at the same time. Nonwoven and shade net age for different reasons again. Tiangang has set out the ageing mechanisms, the choice between xenon and QUV testing, and a grade-by-grade table for all six covering categories in one document: anti-ageing solutions for agricultural covering materials.

Frequently asked questions

How does XT-8 differ from a conventional HALS?

Conventional N-H HALS are fairly basic and get protonated and deactivated by acids. XT-8 uses an N-OR (NOR) structure that does not react with acidic species, so it keeps working in acid rain and in films exposed to sulfur- and chlorine-bearing pesticides.

What level of sulfur and chlorine resistance?

Sulfur 3000–7000 ppm and chlorine ≤850 ppm. That is the range stated on the product page; actual performance still depends on film construction, pesticide type and spraying frequency.

Used alone or in a blend?

Either. It works alone and also in combination with HS-625. The blend is mainly a balance between longevity and cost, set by the target covering period.

The figures and guidance above follow Tiangang's published technical material and common industry practice. For a specific formulation, refer to the batch COA and the technical agreement between the parties.