Perovion MEKP LHB is a methyl ethyl ketone peroxide (MEKP) solution in dimethyl phthalate, formulated as a higher-activity curing initiator for unsaturated polyester and vinyl ester resin systems. With an elevated active oxygen content, it delivers faster gelation and initial cure compared to standard MEKP formulations. Perovion MEKP LHB is widely used in laminating resins, lacquers, corrugated sheet manufacture, and other composite applications where accelerated cure response is required at ambient or mildly elevated temperatures.
Perovion MEKP LHB Overview
Perovion MEKP LHB belongs to the methyl ethyl ketone peroxide family of organic peroxide curing initiators. The product is formulated in dimethyl phthalate, a high-boiling aromatic solvent that contributes to its stability profile and compatibility with a range of polyester and vinyl ester resin systems. When combined with a cobalt-based accelerator, the product undergoes redox decomposition to generate free radicals that initiate crosslinking of the unsaturated bonds in the resin matrix.
The higher active oxygen level of Perovion MEKP LHB relative to standard MEKP grades results in a more vigorous initial cure response. This characteristic makes it well suited to applications that require rapid gel formation, fast build-up of green strength, and reliable through-cure at ambient or mildly elevated temperatures in both open mold and closed mold manufacturing processes.
Key Features
- Higher active oxygen content: Perovion MEKP LHB provides an elevated active oxygen level of approximately 9.8–10.0%, which supports faster gelation and more vigorous initial cure compared to conventional MEKP solutions. This results in shorter gel times and faster build-up of green strength in the laminate, which is advantageous in production environments where cycle time is a key consideration. The higher reactivity also allows for reduced initiator dosage in some systems where shorter gel time must be balanced against exotherm management.
- Dimethyl phthalate solvent system: The dimethyl phthalate carrier gives the product a relatively high density, good thermal stability, and broad compatibility with standard polyester and vinyl ester resin types. The high-boiling solvent reduces volatility compared to some alternative MEKP solvent systems, supporting safe handling in open mold manufacturing environments. This solvent choice also contributes to the product’s stability during storage and transport.
- Fast gelation for laminating and lacquer applications: The curing system based on Perovion MEKP LHB and a cobalt accelerator is particularly suited to laminating resins and surface coatings where a rapid gel response is needed. This makes it appropriate for hand lay-up, spray-up, and continuous lamination processes that benefit from quick initial set and consistent gel time control across varying ambient conditions.
- Suitable for light-resistant part manufacture: Laminates produced using this initiator can exhibit light-resistant properties, in contrast to amine-accelerated benzoyl peroxide curing systems where color stability under UV exposure may be limited. This characteristic makes it relevant for architectural panel, translucent roofing, and other exterior composite applications where long-term color and clarity are important.
- Corrugated sheet and continuous panel production: Perovion MEKP LHB is applicable to continuous corrugated GRP sheet lines and flat panel production processes, where consistent gel time, rapid through-cure, and stable reactivity at production line speeds are required. Its reactivity profile supports reliable cure progression under varied ambient conditions in these higher-throughput manufacturing environments.
Typical Applications
Perovion MEKP LHB functions as a free-radical curing initiator in cobalt-accelerated unsaturated polyester and vinyl ester resin systems. The cobalt/MEKP redox reaction at ambient temperature generates a radical flux that crosslinks the unsaturated bonds in the resin network. The elevated active oxygen content of this formulation compared to standard MEKP grades accelerates this process, reducing gel time and shortening the open time available before gelation begins. This behavior is exploited in applications where production cycle time is critical or where consistent and rapid through-cure of relatively thick laminates is needed.
Perovion MEKP LHB is used in corrugated glass fibre reinforced plastic (GRP) sheet manufacturing, flat panel laminate production, hand lay-up and spray-up with laminating-grade polyester resins, gel coat and surface coat formulations, and lacquer applications requiring light-resistant cured surfaces. It is also applicable to resin casting and infusion processes where a defined and reproducible gel time is required. The product should not be combined directly with amine-based accelerators or strong acids and alkalis; contact with cobalt-type promotors is the standard activation route for this curing system.
Technical Specifications
- Chemical Type: Methyl ethyl ketone peroxide (MEKP) in dimethyl phthalate
- CAS Number: 1338-23-4
- Appearance: Clear colorless liquid
- Total Active Oxygen: 9.8–10.0%
- Density at 20°C: 1.180 g/cm³
- Viscosity at 20°C: 19 mPa·s
- Water Content: To be confirmed based on the final specification sheet.
Thermal Stability
- Organic peroxides are thermally unstable substances and must be handled with appropriate care.
- SADT: 55°C
Storage Recommendations
- Recommended maximum storage temperature: 25°C
- Store in a dry, well-ventilated area away from heat sources and direct sunlight.
- Keep containers tightly closed.
- Avoid contact with reducing agents, acids, alkalis, and heavy metal compounds.
Packaging & Transport
- Standard Packaging: 5 kg HDPE container
- UN Number: UN 3105
- Transport Class: Organic peroxide type D; liquid; Division 5.2; PG II
Perovion MEKP LHB: Safety & Handling
Perovion MEKP LHB should be handled in accordance with applicable safety procedures for organic peroxides. The product is classified as an oxidizing material and requires appropriate storage and handling measures. Users are advised to review the Safety Data Sheet prior to handling and to implement appropriate personal protective equipment and engineering controls as specified therein. Keep away from flammable materials, ignition sources, and incompatible chemicals including amines, strong acids, and heavy metal compounds other than cobalt accelerators used in their intended role.
Safety Data Sheet and destination-compliant labeling information are available upon request. For related products in the Perovion MEKP range, see also Perovion MEKP L38 and Perovion MEKP L32.