Methyl ethyl ketone peroxide

Methyl ethyl ketone peroxide (CAS 1338-23-4), commonly known as MEKP, is an organic peroxide used as a free-radical initiator in polymer curing and crosslinking systems.

Where is Methyl ethyl ketone peroxide used?

• Unsaturated polyester and vinyl ester resins: standard initiator for fiberglass-reinforced composites such as marine hulls, automotive panels and construction laminates
• Gel coats and casting resins: polymerization initiator
• Rubber compounding: crosslinking agent for heat resistance and mechanical performance in elastomeric profiles and molded parts
• With cobalt-based accelerators it enables ambient-temperature cure cycles for open-mold and hand lay-up fabrication.

Good to know: A liquid solution diluted in plasticizers or inert carriers to reduce reactivity hazards during handling and transport. Buyers should confirm active oxygen percentage and dilution carrier with suppliers when qualifying for specific applications to ensure compatibility.

Commercial specifications

• Commercial concentrations approximately 33% to 60% active oxygen content
• Grades vary by reactivity profile for different resin systems and processing conditions