Benefits of Vazo™


  • Solvent-Soluble Vazo™ free radical sources offer a number of advantages over organic peroxides.
  • More stable than most peroxides, so can be stored under milder conditions and are not shock-sensitive.
  • Decompose with first-order kinetics; not sensitive to metals, acids, and bases; not susceptible to radical-induced decompositions. This makes Vazo™ free radical sources more efficient and predictable than other free radical sources.
  • Produce less energetic radicals than peroxides, so there is less branching and cross-linking.
  • Are weak oxidizing agents, which lets them be used to polymerize unsaturated amines, mercaptans, and aldehydes without affecting pigments and dyes.
  • Are available in four grades to use over a wide temperature range.

Frequently Asked Questions


The questions below are the ones we most frequently encounter from customers about our Vazo™ products:


Are Vazo™ free radical sources toxic?

They exhibit low to moderate toxicity. However, tetramethylsuccinonitrile (TMSN), a by-product of Vazo™ 64, is highly toxic. The properties of TMSN should be discussed with a Chemours Technical Service Representative before attempting to use Vazo™ 64. Vazo™ 67 is a safer alternative. For comparison, the oral toxicity data of Vazo™ products and their decomposition products are shown in the table below. For all grades except Vazo™ 67, the quantities represent approximate lethal dose (ALD); for Vazo™ 67, the quantities are the lethal dose for 50% of test animals.

Approximately Oral Toxicity in Rats (mg/kg) Product Azo


Product  Azo Compound  Decomposition Products

  • Vazo™ 52  >5,000  5,000  
  • Vazo™ 64  670  60 (TMSN alone)  
  • Vazo™ 67  982 1,316
  • Vazo™ 88  >11,800  >3,400

 Is it important to store Vazo™ at or below the temperature recommended by Chemours?

Yes! Vazo™ free radical sources may decompose violently if stored above the recommended temperatures. Product quality is also maintained when Vazo™ free radical sources are stored properly.


What are the recommended storage temperatures?

For safety, the maximum storage temperatures are as follows: Vazo™ 52 (10°C [50°F]); Vazo™ 64 and Vazo™ 67 (24°C [75°F]); Vazo™ 88 (35°C [95°F]). These temperatures ensure a 3-month shelf life; colder temperatures will extend shelf life. Vazo™ products should never be stored at temperatures higher than those listed here.


Is there an explosion hazard with airborne dust from Vazo™ free radical sources?

Yes! Airborne dust will form explosive mixtures in air.