Tiangang® T-69 Light Stabilizer with Improved Acid Resistance
One-pack system · T-69
Highly effective UV light stabilizer with improved acid resistance
In one sentence: A blended additive package with a 90 – 130 °C melting point and a 5% weight-loss temperature above 300 °C, dosed by scenario.
- Melting point: 90 - 130 °C (source: spec table on this page)
- Temperature at 5% weight loss: >300 °C (source: spec table on this page)
- Agricultural film dosage: 0.3 – 1.5% (source: recommended dosing table on this page)
- Automotive compound dosage: 0.3 – 1.0% (source: recommended dosing table on this page)
What it is
Tiangang® T-69 Light Stabilizer with Improved Acid Resistance is a one-pack system. A one-pack pre-blends light stabilizer, antioxidant and UV absorber for a specific application, so the customer receives one product instead of several to weigh and mix. Product identifiers: melting point T-68: 80 - 100; T-69: 90 - 130.
Technical data
| Product Description | Tiangang® T-68/T-69 are highly effective UV Light Stabilizers, especially suitable for a variety of polymer resins, preventing polymer from UV induced degradation, for example loss in mechanical properties. This product has improved resistance against sulfur, chloride, and other acidic substances, which would cause traditional light stabilizers to fail. |
| Appearance | Melting Point, oC | Weight Loss, oC (5% weight loss, 20 oC/min, N2) | |
| Tiangang® T-68 | Yellow to brownish powder | 80 – 100 | > 300 |
| Tiangang® T-69 | 90 – 130 | > 300 |
| Tiangang® T-68 / T-69 | Usually 0.1-0.8% should effectively improve weatherability of the plastics articles, however, exact dosage must be determined after experiments. You are welcome to contact our technical representative for assistance in evaluation of performance of certain formulae. |
| Tiangang® T-68 / T-69 | The use of proper protective equipment is recommended. Excess exposure to the product should be avoided. Wash thoroughly after handling. Store the product in a cool, dry, well-ventilated area away from incompatible materials. |
| Tiangang® T-68 / T-69 | 20 or 25KG carton box with PE inner bag |
Melting point T-68: 80 - 100; T-69: 90 - 130 °C — the processing window needs to reach above it for uniform dispersion.
Where it is used, and at what loading
Each grade maps to one scenario: agricultural film means pesticide and sulfur resistance; automotive compounding means high-temperature processing plus long exterior life; thin-wall parts mean low volatility. Choosing the wrong scenario is choosing the wrong formulation.
| Agricultural film | 0.3 – 1.5% |
|---|---|
| Automotive compounds | 0.3 – 1.0% |
| Thin-wall and moulded parts | 0.3 – 0.8% |
Figures above are typical industry ranges, not guaranteed values. The actual loading depends on wall thickness, design life and the other additives in the system, and should be established by a loading ladder on the real formulation.
On the line
Weigh the pack against the total target loading and dry-blend with the resin; there is no need to dose the individual components. Where the formulation also contains acidic components (some flame retardants, acidic fillers, sulfur-bearing additives), separate the feed order or switch to a low-basicity grade to avoid protonating the HALS. For lines running many grades in small batches, a one-pack mainly removes the chance of a mixing error.
Choosing between similar grades
Three things decide the choice for T-69: carrier-to-matrix match, active content, and application fit. Same agricultural pesticide-resistant family as T-66 with a different ratio; favoured in hot, humid, high-UV greenhouse regions.
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
Why buy a one-pack instead of blending in-house?
Blending in-house means solving three problems: ratio, dispersion and batch-to-batch consistency. A one-pack solves them at the factory, leaving the line with a single loading figure. For lines running many grades in small batches, what it removes is the chance of a mixing error.
Can the ratio inside the pack be adjusted?
Yes, given volume. Our blending line has a minimum order for custom ratios, because every blend is re-validated for dispersion and homogeneity.
Why are there several grades for one application?
Differences inside an application are larger than they look. Agricultural film in hot humid south China and in high-UV north China need different balances; bumper and instrument panel differ in wall thickness and surface requirement. Finer grade splits keep the tuning margin in the customer's hands.
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.
Certifications
- National High-Tech Enterprise
- Vice Chairman Unit, China Plastics Processing Industry Association (CPPIA)
- Vice Chairman Unit, Agricultural Plastics Branch, China Agricultural Plastics Application Technology Society
- Member, Ageing Methods Subcommittee, National Technical Committee on Plastics (SAC/TC15/CS5)
- Member, Society of the Plastics Industry (SPI), USA
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