What is UV-531?
UV-531 (2-Hydroxy-4-n-octoxybenzophenone) is a highly effective benzophenone-type ultraviolet absorber designed to protect polymers and coatings from UV-induced degradation.
It strongly absorbs ultraviolet light in the 260–350 nm range, helping prevent yellowing, cracking, loss of strength, and aging caused by long-term UV exposure.
UV-531 is widely used across industries including plastics, coatings, rubber, adhesives, and petrochemicals, making it a versatile and cost-effective UV stabilizer.
Solubility
Soluble in acetone, benzene, n-heptane, and n-hexane; slightly soluble in methanol and ethanol.
SUPPLEMENT FACTS
| Appearance | Light yellow crystalline powder or flakes |
| Chemical Name | 2-Hydroxy-4-n-octoxybenzophenone |
| CAS | 1843-05-6 |
| Molecular Formula | C21H26O3 |
| Molecular Weight | 326.4g/mol |
| Specification | 99% |
| Packaging | Drum,Vacuum Packed,Aluminum Foil Bag |
| Shelf Life | 2 Years Proper Storage |
| For research use only |
Specifications
|
Item |
Specification |
|
Appearance |
Light yellow crystalline powder |
|
Melting Point (°C) |
47–50 |
|
Loss on Heating (%) |
≤ 0.5 |
|
Ash Content (%) |
≤ 0.1 |
|
Transmittance (%) |
460 nm: ≥ 96.0 |
|
500 nm: ≥ 97.0 |
What Are the Benefits of UV-531?
Strong UV Absorption (260–350 nm)
Effectively blocks harmful UV radiation, extending the service life of materials.
01
Excellent Thermal Stability
Maintains performance under high processing temperatures.
02
Non-Staining & Non-Discoloring
Does not affect the appearance of end products-ideal for transparent and light-colored materials.
03
Broad Compatibility
Suitable for a wide range of polymers and resins.
04
Improves Weather Resistance
Enhances durability against sunlight, oxidation, and environmental aging.
05
What Are the Applications of UV-531?
Plastics Industry
Widely used in:
PE, PP, PS
ABS, PC
PVC, PVDC
TPO, TPE, EVA
Coatings & Paints
Alkyd and phenolic varnishes
Polyurethane coatings
Acrylic coatings
Epoxy systems
Automotive refinishing paints
Powder coatings
Other Applications
Rubber products
Adhesives & sealants
Agricultural films (mulch films, greenhouse films)
Artificial grass & WPC materials
Rotational molding products
Unsaturated polyester resin
Recommended Dosage
Typical dosage: 0.3–0.5 phr
(Exact dosage should be optimized through formulation trials.)
Packaging & Storage
Packaging
20 kg / 25 kg paper drum or carton
Inner plastic liner for moisture protection
Storage Conditions
Store in a cool, dry, and well-ventilated area
Avoid moisture, heat, and direct sunlight
Keep packaging sealed and intact
Who are we?
Xi'an Ruichi Biotech Co., Ltd. is an innovative life science company providing dietary supplements, custom synthesis. We also provide OEM and private label services, including custom logo and packaging options, to meet your branding needs. Dosage forms including powder, capsules,softgels, tablets. As an FDA-registered manufacturer, we are committed to improving human health through consistent quality, regulatory compliance, and sustainable growth. We manufacture and source a broad portfolio of dietary supplements and health ingredient raw materials for global markets.
Quality is embedded in every stage of our operations. All manufacturing activities are conducted under strict supervision, following validated processes and standardized procedures. Our facilities operate in full compliance with GMP requirements, ensuring that every product meets international quality and safety standards. We maintain a comprehensive system of documented SOPs, aligned with GMP guidelines and ISO 9001:2015 certification, to support reliability, traceability, and continuous improvement.
Our quality management system integrates ISO 9001:2015 and GMP standards, enabling us to deliver products and services that meet the expectations of global pharmaceutical and nutraceutical markets. All products are tested in accordance with leading pharmacopeial standards, including CP, BP, EP, and USP. Every batch is freshly manufactured, with a typical shelf life of 2–3 years, ensuring optimal stability and performance.
Logistics Update
To ensure that customers receive their goods smoothly,we supply all kinds of couriers according to different needs.Like DHL, FedEx, UPS, EMS, TNT, by Sea, by Air.
We can provide customized packaging according to your requirement.
Payment method
Certification
FAQ
Q: What is UV-531 mainly used for?
A: UV-531 is used to protect plastics, coatings, and polymers from UV degradation, extending product lifespan.
Q: Is UV-531 suitable for transparent materials?
A: Yes. It is non-staining and non-discoloring, making it ideal for clear or light-colored applications.
Q: Can it be used in outdoor applications?
A: Absolutely. It significantly improves weather resistance and UV stability.
Q: Does it work with other stabilizers?
A: Yes. UV-531 can be combined with antioxidants and HALS for enhanced performance.
Looking for a reliable UV Absorber UV-531 supplier? Pls feel free to contact Xi'an Ruichi Biotech Co., Ltd. for bulk pricing, samples, and Technical documents. Boost your product durability with high-performance UV protection solutions.
E-mail: Jenny@ruichibio.com
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