Antioxidant 1135 CAS 125643-61-0
Antioxidant 1135, also known as AO-1135, is a liquid hindered phenolic antioxidant with CAS number 125643-61-0. It is based on C7–C9 alkyl esters of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid and is widely used as an antioxidant in polyurethane and other polymer formulations.
It is an excellent free-flowing liquid antioxidant. It is soluble in most organic solvents, non-toxic, with low volatility and good compatibility. It is especially suitable for the air-cooling processing of polyurethane, and can also prevent discoloration of textiles (such as furniture fabrics, blankets, hats, etc.). The good fluidity of FY-1135 makes it very suitable for polymers processed in the form of liquids, emulsions, suspensions, solutions or melts. It can be added either before or after polymerization.
Chemical Information
Product Name: Antioxidant 1135
CAS Number: 125643-61-0
EC Number: 406-040-9
Chemical Type: Hindered Phenolic Antioxidant
Appearance: Liquid
Chemical Structure: C7–C9 alkyl esters of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid
Chemical formula: C25H42O3
Molecular Weight: 390.61

Key Features and Benefits
Liquid Form: Convenient for handling, blending and incorporation into liquid polyurethane raw material systems.
Oxidation Protection: Helps inhibit oxidative degradation in polyol and polymer formulations.
Polyol Compatibility: Designed for use in suitable polyurethane polyol systems.
Foam Scorching Control: Helps reduce oxidation-related scorching risks during polyurethane foam production.
Low Volatility: Suitable for formulations where low volatility is an important consideration.
Versatile Application: Can be evaluated in other polymer and industrial formulations requiring hindered phenolic antioxidant protection.
Applications of Antioxidant 1135
Polyurethane Flexible Foam
Antioxidant 1135 is primarily used in flexible polyurethane foam production. It helps protect polyol components against oxidation and can reduce the risk of scorching during the foaming process. It is suitable for evaluation in slabstock and other flexible PU foam formulations.
Polyether Polyols
Antioxidant 1135 is used in polyether polyol systems to help control oxidation during storage and processing. It can help maintain the quality and stability of polyurethane raw materials.
Polyurethane Products
It can be incorporated into selected polyurethane formulations to improve resistance to oxidative degradation during processing and service life.
Other Polymer Formulations
Antioxidant 1135 may also be considered for selected elastomers, polymer blends and industrial formulations, subject to compatibility and application testing.
Technical Specifications
Appearance: Colorless or pale yellow transparent liquid
Color (Pt-Co): ≤100
Solubility: Clear
Moisture, %: ≤0.1
Acid Value / (mgKOH/g): ≤1.0
Purity (GC), %: ≥98.0
Packaging
Packed in iron drums, or customized as requested by customers.
Storage and Handling
Store Antioxidant 1135 in tightly closed original containers in a cool, dry and well-ventilated area. Protect the product from excessive heat and direct sunlight.
Why Choose Hosea Chem for Antioxidant 1135?
Hosea Chem provides chemical products for international industrial customers, distributors and manufacturers. We support inquiries for Antioxidant 1135 CAS 125643-61-0 with product information, technical documentation and bulk supply arrangements.
Contact Hosea Chem to discuss your application, required specifications, packaging and purchasing quantity.
Frequently Asked Questions
What is Antioxidant 1135?
Antioxidant 1135 is a liquid hindered phenolic antioxidant with CAS number 125643-61-0. It is mainly used to protect polyurethane and polyol systems against oxidative degradation.
What is Antioxidant 1135 used for?
Its primary application is in polyurethane flexible foam and polyether polyol systems. It helps control oxidation and reduce the risk of scorching during foam production.
Is Antioxidant 1135 suitable for polyurethane foam?
Yes. Antioxidant 1135 is commonly used in polyurethane flexible foam formulations. The recommended dosage and compatibility should be confirmed through formulation testing.
What are the alternative names for Antioxidant 1135?
Commonly used names include AO-1135, Irganox 1135, RIANOX 1135 and Evernox 1135. These are commercial or market names; exact product equivalence should be verified with the relevant manufacturer.
Can Antioxidant 1135 be purchased in bulk from China?
Yes. Contact Hosea Chem for current availability, specifications, packaging options, lead time and bulk quotation.