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United Initiators NOROX?CHP Cumyl hydroperoxide 80-15-9

Basic Information

  • Name: NOROX? CHP
  • Chemical composition: cis-Cumyl hydroperoxide
  • CAS No.: 80-15-9
  • Form: liquid mixture

descriptive

  • NOROX? CHP is a colorless to pale yellow liquid solution of cis-isopropylbenzene peroxide. It is an economical free radical initiator for unsaturated polyester resins, vinyl monomers, as well as greases and alkyds.
  • NOROX? CHP can be used alone or in combination with other peroxides in ambient and elevated temperature processes.

Technical data

  • Appearance: light yellow to colorless liquid
  • Active oxygen content: 8.7%
  • Cis-isopropylbenzene hydrogen peroxide content: 80-85%
  • Flash Point (Seta C.C.): > 72°C
  • Density @ 20°C: 1.05 g/cm3.
  • Soluble in: alcohols, ketones, esters, hydrocarbons
  • Slightly soluble in: water
  • SADT: 75°C
  • Recommended storage temperature: below 30°C, maintains activity for 6 months from date of delivery.

appliance

  • NOROX? CHP is particularly suitable for initiating curing of unsaturated polyester resin systems at ambient and elevated temperatures.
  • The exothermic profile typically exhibited is mild and flat, resulting in a gradual but thorough cure. This characteristic minimizes cracking and crazing in thicker cross sections.
  • NOROX? CHP is typically used in pre-promoted resin systems using cobalt and/or manganese compounds as the primary catalyst.
  • CAUTION: NOROX CHP should never be mixed with acids or directly with accelerators or accelerants. It may result in violent decomposition, causing fire and/or explosion.

Technical data

  • This combination will result in a lower peak exotherm, the exact magnitude of which is determined by the mix ratio. The use of NOROX? CHP in the mixture will extend the cure time, but should not diminish the final cure.
  • At temperatures above 82°C, NOROX? CHP behaves like a highly exothermic peroxide.
  • Above 121°C, the use of NOROX? CHP may result in exothermic phenomena beyond what is normally expected for diphenyl ketone peroxide or methyl ethyl ketone peroxide.

Measurement data

  • Resin: Vinyl Epoxy Resin*
  • Temperature: 25°C
  • Percentage of initiator: 1.5%
  • Accelerator percentage: 0.10% (12% cobalt) + 0.05% DMA
  • Initiator Gel Time (minutes): 935
  • Time to peak (minutes): >236
  • Peak exothermic temperature (degrees Celsius): 28
  • 2 hours hardness: 0
  • 3 hours hardness: 0
  • 4 hours hardness: 7
  • 24-hour hardness: 934
  • NOROX? CHP: 56
  • NOROX? CHM-50: 16
  • NOROX? MEKP-925H: 18

Results are determined by United Initiators laboratory test methods and are for comparison purposes only. Resin suppliers should be contacted for specific recommendations for individual resins.

wrap

  • NOROX? CHP is packaged in standard 25 kg polyethylene bottles.

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