Product Introduction
UV-531 is a benzophenone-based ultraviolet absorber used in polymer processing to reduce UV-induced degradation in plastics, coatings, rubber, and adhesive systems.
It absorbs ultraviolet radiation in the 260–350 nm range, converting UV energy into low-level thermal energy, which helps reduce polymer chain breakdown during long-term sunlight exposure.
Unlike general additives that only delay surface aging, UV-531 is designed to act inside the polymer matrix, improving material stability during both processing and outdoor service life.
Technical Information
|
Item |
Specification |
|
Product Name |
UV Absorber UV-531 |
|
Chemical Name |
2-Hydroxy-4-n-octoxybenzophenone |
|
CAS No. |
1843-05-6 |
|
Molecular Formula |
C21H26O3 |
|
Molecular Weight |
326.4 g/mol |
|
Appearance |
Light yellow crystalline powder or flakes |
|
Purity |
≥ 99% |
|
Shelf Life |
24 months (proper storage) |
Quality Control Specification
|
Item |
Specification |
Test Method |
|
Appearance |
Light yellow powder |
Visual |
|
Melting Point |
47–50 °C |
DSC |
|
Loss on Heating |
≤ 0.5% |
Gravimetric |
|
Ash Content |
≤ 0.1% |
Combustion |
|
Transmittance (460 nm) |
≥ 96.0% |
UV-Vis |
|
Transmittance (500 nm) |
≥ 97.0% |
UV-Vis |
Solubility
UV-531 is compatible with common organic formulation systems:
Soluble in: Acetone, benzene, n-heptane, n-hexane
Slightly soluble in: Methanol, ethanol
It is suitable for use in masterbatch, resin systems, and coating formulations.
Application Fields
Agricultural Film (PE / PP Greenhouse Film)
Used in greenhouse and mulch film production to absorb UV radiation during outdoor exposure, reducing film cracking and brittleness after long-term sunlight aging.
Engineering Plastic Parts (ABS / PC Housings)
Used in injection molding of outdoor equipment housings to prevent surface yellowing and micro-cracking caused by UV exposure.
Coating Systems (PU / Acrylic Coatings)
Used in automotive refinishing and industrial coatings to reduce gloss loss and surface chalking after prolonged UV exposure.
Rubber & Elastomer Products
Used in sealing components and TPE products to reduce surface hardening and aging caused by sunlight exposure.
Recommended Dosage
|
Application |
Dosage Range |
|
Plastics |
0.3–0.5 phr |
|
Coatings |
0.2–0.5 phr |
|
Rubber |
0.3–0.5 phr |
Final dosage should be optimized based on formulation, processing temperature, and UV exposure conditions.
Quality Control Process
1. Raw Material Testing
Each batch of raw materials is tested by HPLC to verify purity and detect impurities before entering production.
2. In-Process Control (IPC)
During synthesis and purification, samples are taken every 2 hours to monitor reaction progress and impurity formation.
3. Finished Product Testing
Final products are tested for:
- Appearance consistency (color and particle uniformity)
- Melting point range verification
- Purity testing via HPLC (≥99%)
- Moisture and ash content control
4. Final Release Inspection
Each batch undergoes final verification before shipment, and a COA is issued. Third-party testing (e.g., SGS) is available upon request.
Packaging & Shipping
Packaging Structure
Inner layer: Sealed PE moisture-proof liner to prevent moisture absorption
Middle layer: Reinforced paper drum or carton box
Outer layer: Export-standard palletized packaging for stacking stability
Loading Configuration
Standard: 20–25 kg per drum
Approx. 40–50 drums per pallet (adjusted based on transport method)
Shipping Methods
Sea freight (FCL / LCL bulk shipment)
Air freight for urgent orders
Express courier (DHL / FedEx / UPS) for samples
Reinforced packaging available for long-distance export (moisture + impact protection)
Certifications & Compliance
This product can be supplied with the following documentation:
- ISO 9001 quality management system compliance
- GMP manufacturing environment
- MSDS (Material Safety Data Sheet)
- COA (Certificate of Analysis) per batch
- Third-party test reports (upon request)
- REACH / RoHS support (export-dependent compliance)
Frequently Asked Questions
Q: What is UV-531 mainly used for?
A: It is used to protect polymers, coatings, and rubber from UV-induced aging and degradation.
Q: Is UV-531 suitable for transparent materials?
A: Yes, it is non-yellowing and suitable for transparent applications.
Q: Can it be used outdoors long-term?
A: Yes, it significantly improves UV resistance and weather durability.
Q: Does UV-531 affect product color?
A: No, it is designed to be non-staining and non-discoloring.
Q: Can it be used with HALS stabilizers?
A: Yes, it is commonly used with HALS for synergistic UV protection.
Q: What is the typical shelf life?
A: 24 months under proper storage conditions.
Q: What industries use UV-531 most?
A: Plastics, coatings, rubber, adhesives, and agricultural films.
Q: What documents are provided with shipment?
A: COA, MSDS, and compliance documents are available.
Q: What is the MOQ?
A: Standard MOQ is 25 kg, sample orders are supported.
Q: What is the delivery time?
A: Typically 7–15 working days depending on order volume.
Hot Tags: uv absorber uv-531, China uv absorber uv-531 manufacturers, suppliers, factory
