UV Absorbers
UV Absorber UV-3638
2,2'-(1,4-Phenylene)bis(4H-3,1-benzoxazin-4-one)
Benzoxazinone UVA — extremely low volatility, engineered for engineering plastics.
Product Description
UV-3638 is a benzoxazinone UV absorber that converts 290–360 nm radiation into heat through photo-tautomerism. Its rigid, high-molecular structure has extremely low volatility, surviving the demanding processing conditions of nylon and polyester without decomposition or precipitation.
UV-3638 contributes virtually no color, suiting light and transparent engineering plastics. It excels in PA6/PA66, PC, PET, PBT and PPO, and remains effective in polyacetal, polyolefin fibers, styrenics and elastomers.
Typical loadings are 0.2–0.5 wt%. Aolong UV-3638 is of high crystalline purity with consistent batches and full regulatory documentation.
Key Features
- Extremely low volatility — no precipitation under severe processing
- No color contribution — suits light-colored parts
- Efficient 290–360 nm absorption
- Friendly to polymer stability
Applications
- Nylon PA6/PA66 parts and fibers
- PC sheet and moldings
- PET and PBT
- PPO and polyacetal
- Polyolefin fibers and elastomers
Specifications
| CAS No. | 18600-59-4 |
|---|---|
| Molecular Formula | C22H12N2O4 |
| Molecular Weight | 368.35 |
| Appearance | White to off-white crystalline powder |
| Assay (HPLC) | ≥ 98.0% |
| Loss on Drying | ≤ 0.5% |
Packaging & Storage
25 kg fiber drum with PE liner or 25 kg carton. Store cool, dry and protected from light; shelf life 24 months in original sealed packaging.
Related Products
UV Absorbers
UV Absorber UV-1164
2-(2-Hydroxy-4-octyloxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine
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