Description

1,3-Dioxido-2,4-Bis[(2,2,6,6-Tetramethyl-4-Piperidyl)Amino]Cyclobutenediylium is a high-performance, hindered amine-based compound primarily valued for its exceptional light stabilization properties. This chemical acts as a highly effective UV absorber and radical scavenger, protecting polymers and coatings from photodegradation and extending their service life. It is a critical additive for manufacturers in the plastics, automotive coatings, and advanced materials industries who require superior weatherability and color retention in their finished products.

Application

• Polymer Stabilizer: A key light stabilizer (HALS - Hindered Amine Light Stabilizer) in polyolefins (PP, PE), engineering plastics, and synthetic fibers to prevent UV-induced degradation, cracking, and embrittlement.
• Automotive & Industrial Coatings: Used in automotive clear coats, industrial paints, and powder coatings to enhance gloss retention, prevent chalking, and maintain color stability under prolonged sun exposure.
• Agricultural Films: Incorporated into greenhouse films, mulch films, and silage covers to significantly improve their resistance to solar radiation, thereby extending functional lifespan.
• Adhesives & Sealants: Enhances the durability and performance of high-end adhesives and sealants used in construction and automotive applications that are exposed to outdoor conditions.
• Advanced Material Protection: Provides photostabilization for advanced composites and materials used in solar panel components and outdoor infrastructure.

Basic Information

Item	Detail
Product Name	1,3-Dioxido-2,4-Bis[(2,2,6,6-Tetramethyl-4-Piperidyl)Amino]Cyclobutenediylium
CAS No.	85909-43-9
Molecular Formula	C26H48N4O22+ • 2X-
Molecular Weight	464.70 g/mol (Cation)
Synonyms	Bis(2,2,6,6-tetramethyl-4-piperidyl)aminium squarate; Light Stabilizer 858; HALS 858; 2,4-Bis[(2,2,6,6-tetramethyl-4-piperidinyl)amino]-1,3-cyclobutanediylium-1,3-diolate; Squaric acid bis(2,2,6,6-tetramethyl-4-piperidyl)amine salt; UV Stabilizer 85909-43-9; LS-858; Tinuvin 858 (related commercial grade)
EINECS	Contact for details

Quality Control

Our production of 1,3-Dioxido-2,4-Bis[(2,2,6,6-Tetramethyl-4-Piperidyl)Amino]Cyclobutenediylium adheres to a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for assay and purity, to ensure consistency and performance. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and physical specifications is provided with each shipment to guarantee it meets your technical requirements.

Storage

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

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Melting Point	Decomposes above 300°C
Loss on Drying	≤ 1.0%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 10 ppm

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