HS Code for Antioxidants for rubber

HS code 381231 is specifically assigned to anti-oxidising preparations and other compound stabilisers intended for use with rubber or plastics, provided they are mixtures of oligomers of 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ). This precise classification highlights the importance of the chemical identity of the antioxidant. TMQ is a widely recognized polymeric hindered amine antioxidant, valued for its effectiveness in protecting rubber from oxidative degradation caused by heat, oxygen, and fatigue. Its specific chemical structure and function are the defining characteristics that place it under this particular HS code, differentiating it from other antioxidant types.

Products Included

• Polymeric hindered amine antioxidants based on TMQ
• TMQ-based stabilisers for natural rubber
• TMQ-based stabilisers for synthetic rubber (e.g., SBR, BR, NBR)
• Antioxidant masterbatches containing TMQ for rubber compounding
• Preparations primarily composed of TMQ oligomers for rubber and plastic applications

Common Misclassification

The most frequent misclassification occurs with HS code 381239, which covers anti-oxidising preparations and compound stabilisers for rubber or plastics that are *not* mixtures of oligomers of TMQ. The crucial difference lies in the specific chemical composition: 381231 is strictly for TMQ-based products, while 381239 is for all other antioxidant types. Another potential area of confusion is with HS code 381210, which pertains to accelerators for rubber. While both are chemical additives used in rubber processing, their roles are fundamentally different: accelerators facilitate vulcanization, whereas antioxidants prevent material degradation and extend product life.

FAQ

What is the HS code for Antioxidants for rubber?

The HS code for antioxidants for rubber, specifically those that are mixtures of oligomers of 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ), is 381231.

What is 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ)?

2,2,4-trimethyl-1,2-dihydroquinoline (TMQ) is a prominent polymeric hindered amine antioxidant. It is widely utilized in the rubber and plastics industries to provide excellent protection against oxidative degradation, particularly under high-temperature conditions. TMQ functions by scavenging free radicals, thereby inhibiting the chain reactions that lead to material aging and deterioration.