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Antioxidant

Their purpose is to protect polymers from thermo-oxidative degradation both during the manufacturing process (short stabilization) and during the subsequent transformation phases.
Antioxidant additives act also long-term, preserving the characteristics of the finished product.

During the production process, heating polymers creates free radicals that modify the chemical structure of the resins by generating gels and changing the length of polymer chains, resulting in loss and/or deterioration of their mechanical characteristics (change of MFI, worsening of gloss) and of their aesthetic properties, including discoloration.

Possible processing problems
The presence of antioxidants might lead to a few problems, such as gas fading discoloration of polymers toward yellow or pink.
This problem is easily fixed by using our ‘no gas fading’ antioxidant additives.

CODE

COMMERCIAL DESCRIPTION

COMPATIBILITY

CODE
COMMERCIAL DESCRIPTION

RIFRACHEM ANTIOX WE/D

PROCESS ANTIOXIDANT CREATED AS A CLEANING AGENT. IT REMOVES ANY CARBON RESIDUES FROM THE EXTRUDER. ADDED TO THE MACHINE AT THE END OF THE CYCLE, IT LIMITS THE FORMATION OF ENCRUSTATIONS.
COMPATIBILITY
LDPE,LLDPE,HPDE,PP OMO,PP COPO
CODE
COMMERCIAL DESCRIPTION

RIFRACHEM PE ANTIOX PPH/900

MAINLY A PROCESS ANTIOXIDANT, DESIGNED TO PROTECT THE POLYMER DURING PRODUCTION. IT DOES NOT GIVE GAS FADING PROBLEMS
COMPATIBILITY
LDPE,LLDPE,HPDE,PP OMO,PP COPO
CODE
COMMERCIAL DESCRIPTION

RIFRACHEM ANTIOX PPH/12

MAINLY A PRODUCT ANTIOXIDANT, DESIGNED FOR THE PROTECTION OF HDPE, TO ALLOW IT TO PASS THE CRITICAL OIT TESTS
COMPATIBILITY
LDPE,LLDPE,HPDE,PP OMO,PP COPO
CODE
COMMERCIAL DESCRIPTION

RIFRACHEM ANTIOSSIDANTE PPH/553 1-2% XW0

USEFUL TO AVOID MELT INDEX VARIATIONS RESULTING FROM PP RECYCLING AND RECOVERY
COMPATIBILITY
PP OMO