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Doverphos® 4-HR (TNPP)

Doverphos® 4-HR (TNPP) by Dover (ICC Industries) is a liquid trisnonylphenol phosphite (TNPP) with approximately 0.75% triisopropanolamine. Acts as a heat stabilizer and antioxidant. It is an aryl phosphite with high molecular weight and low phosphorus content. The effectiveness of Doverphos® 4-HR (TNPP) is enhanced by the addition of other stabilizers like hindered phenol. Complies with FDA. Recommended usage ranges from 0.1 to 3.0%.
Product Type
  • Heat Stabilizers
  • Antioxidants > Phosphites
Chemical Composition
Blend of trisnonylphenol phosphite and triisopropanolamine
CAS Number
26523-78-4, 122-20-3
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