Description

Bisdisulizole Free Acid CAS NO 170864-82-1 is a high-purity organic compound belonging to the class of bis-benzoxazole derivatives, valued for its exceptional light-absorbing and stabilizing properties. This compound is critical for formulators seeking to enhance the photostability and longevity of products exposed to ultraviolet (UV) radiation. It is primarily required by manufacturers in the personal care, polymer, and specialty chemical industries for developing advanced sunscreens, UV-protective coatings, and light-stabilized materials.

Application

• Broad-Spectrum UV Filter in Sunscreen Formulations: Acts as a primary or secondary organic UV filter to provide effective protection against UVA and UVB rays in creams, lotions, and sprays.
• Light Stabilizer for Polymers and Plastics: Incorporated into engineering plastics, automotive coatings, and packaging materials to prevent photodegradation, yellowing, and loss of mechanical strength.
• Additive for UV-Curable Resins and Coatings: Enhances the performance and durability of coatings, inks, and adhesives that are cured using ultraviolet light.
• Photostabilizer in Cosmetic and Personal Care Products: Used to protect colorants, fragrances, and active ingredients in makeup, hair care, and skincare products from photo-induced degradation.
• Research & Development Chemical: Serves as a key intermediate or reference standard in pharmaceutical and chemical research for developing new photoprotective agents.
• Industrial Additive for Protective Films: Applied in the production of films and sheets designed for agricultural, construction, or automotive applications requiring long-term UV resistance.

Basic Information

Product Name	Bisdisulizole Free Acid
CAS No.	170864-82-1
Molecular Formula	C₂₀H₁₈N₄O₈S₂
Molecular Weight	506.51 g/mol
Synonyms	Bisdisulizole; Disodium Phenyl Dibenzimidazole Tetrasulfonate (Acid Form); 2,2'-Bis(1,4-phenylene)bis[1,3-benzoxazole]-5,5'-disulfonic Acid; Phenylene Bis-Benzoxazolyl Disulfonic Acid; UV Filter 360; Bisdisulizole Acid; Tinosorb® S (Acid Form); Bisdisulizole Free Acid CAS 170864-82-1
EINECS	Contact for details

Quality Control

Our Bisdisulizole Free Acid is manufactured under strict quality management systems to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including HPLC for assay and impurity profiling, spectroscopic identification (IR, UV), and tests for residual solvents and heavy metals. We provide a detailed Certificate of Analysis (COA) with every shipment, confirming compliance with agreed specifications. Our quality commitment supports applications requiring GMP, ISO, and REACH compliance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which may affect product quality.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Residue on Ignition	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 0.5%; Total impurities ≤ 2.0%
Solubility	Sparingly soluble in water; soluble in alkaline aqueous solutions

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.