ULTRANOX™ 626A is a high performance solid phosphite antioxidant that improves color stability and reduces polymer degradation during compounding, fabrication, and end use in a variety of resins. Similar to ULTRANOX® 626 but in a granular form.
Product Overview
ULTRANOX™ 626A is a solid organophosphite antioxidant that improves gas fading performance and color stability during compounding, fabrication, and end use. It delivers high performance at low loading rates, making this a cost effective addition to polymer formulas. ULTRANOX™ 626A synergizes with benzophenone and benzotriazole light stabilizers.

ULTRANOX™ 626A is so effective, it can replace another phosphite antioxidant in your formula and deliver equivalent performance at a significantly lower dosing rate. We've provided a handy calculator below to help you determine the dose of ULTRANOX™ 626A needed to replace your current phosphite antioxidant.

Dosing Rate Calculator

ULTRANOX 626   Dosage
Current Phosphite Annual Vol
ULTRANOX 626   Annual Vol
Product Specifications
Appearance: White granule
Melting Point: 170-180 °C
Acid Number: 1.0 mg KOH/g
Free 2,4-di-t-butylphenol Content: 1.0% max
Phosphorus Content: 10.0-10.3%
Triisopropanolamine Content: 0.5-1.0%
Molecular Weight: 604 g/mol
Flash Point (Closed Cup): 168 °C
Bulk Density @ 20 °C: 0.56 g/ml
Primary Chemistry: Bis (2,4-di-t-butylphenyl) Pentraerythritol Disphosphite
Features & Benefits
Food contact approvals
Excellent color stability during compounding, fabrication and end use
Improved gas fading performance
Synergizes with benzophenone and benzotriazole light stabilizers
High performance at low load rates
Problems Solved
Availability of organophosphite antioxidants in granular form
High loading rate and cost of organophosphite antioxidants
Breakdown and degradation of polymers during compounding, fabrication, and final application of plastic products
Color stability and staining issues in polyolefins and thermoplastics
FDA clearances for the use of organophosphite antioxidants in polypropylene food packaging plastics
Polyolefins, styrenics, engineering thermoplastics