Perovion MEKP LLP is a liquid organic peroxide based on methyl ethyl ketone peroxide (MEKP), formulated as a long-potlife curing agent for unsaturated polyester (UP) and vinyl ester resin systems. Perovion MEKP LLP initiates free-radical crosslinking when combined with a cobalt accelerator, delivering a significantly extended gel time compared with standard-reactivity MEKP grades. Perovion MEKP LLP is widely used for large composite parts, filament winding, and processing in warm ambient conditions, where a longer working window is essential for consistent lay-up and impregnation quality, particularly when large surface areas must be covered before the resin begins to gel.
Perovion MEKP LLP Overview
Methyl ethyl ketone peroxide is produced by reacting methyl ethyl ketone with hydrogen peroxide, yielding a mixture of mono- and di-peroxide species with a defined active oxygen content. Perovion MEKP LLP is formulated in a low-polarity carrier system that extends gel time well beyond standard MEKP grades while maintaining a guaranteed low water content. This combination gives Perovion MEKP LLP a long, stable pot life that is particularly valuable when ambient temperatures rise or when production cycles require more time for resin impregnation and consolidation, without introducing the risk of premature gelation that can affect standard-reactivity grades under the same conditions.
As a liquid initiator, Perovion MEKP LLP is dosed volumetrically into resin batches using standard metering pumps or manual dosing equipment. It is compatible with the cobalt octoate or cobalt naphthenate accelerators typically used in unsaturated polyester and vinyl ester formulations, and its low-polarity formulation tends to generate less foaming during mixing than standard MEKP grades. This makes Perovion MEKP LLP a practical choice for processes sensitive to entrained air or surface finish quality.
Key Features
- Extended Gel Time: Perovion MEKP LLP provides a significantly longer gel time than most other MEKP grades, giving fabricators a wider working window for large parts, complex lay-ups, and processes that cannot be rushed.
- Suited to Vinyl Ester Resin Curing: Perovion MEKP LLP is particularly well suited for curing vinyl ester resins, supporting the resin chemistries commonly used in corrosion-resistant tanks, pipes, and chemical processing equipment.
- Low Water Content: A guaranteed low water content supports consistent gel-time behavior batch to batch and helps reduce the risk of surface defects, such as pinholing, in laminate and gelcoat layers.
- Reduced Foaming: The low-polarity carrier system used in Perovion MEKP LLP tends to generate less foaming during mixing than standard MEKP formulations, which can help maintain a cleaner laminate surface.
- Performs Well at Elevated Ambient Temperature: Perovion MEKP LLP is well suited for use in warm climates or summer production conditions, where standard-reactivity MEKP grades might gel too quickly for comfortable handling.
Typical Applications
Perovion MEKP LLP functions as a curing catalyst for cobalt-promoted unsaturated polyester and vinyl ester resins, initiating the free-radical crosslinking reaction that converts liquid resin into a rigid thermoset network. Its extended gel time makes it especially valuable for filament winding, large tank and pipe fabrication, and other processes where production time exceeds the working window of standard MEKP grades.
Common end uses for Perovion MEKP LLP include large glass fiber reinforced plastic (GRP) structures, filament-wound pipes and tanks, corrosion-resistant vinyl ester equipment, and production runs carried out in high ambient temperature environments where a shorter-potlife MEKP would gel too quickly for practical handling. It is also applicable to hand lay-up and spray-up processes where operators need extra time to complete resin impregnation before gelation begins.
Technical Specifications
- Chemical Type: Methyl ethyl ketone peroxide (MEKP)
- CAS No.: 1338-23-4
- Physical Form: Clear liquid
- Reactivity Level: Long-potlife (extended gel time relative to standard general-purpose MEKP grades)
- Recommended Resin Systems: Unsaturated polyester and vinyl ester resins
- Active Content / Total Active Oxygen: To be confirmed based on the final specification sheet.
- Water Content: Low; exact value to be confirmed based on the final specification sheet.
- Density at 20°C: To be confirmed based on the final specification sheet.
- Viscosity at 20°C: To be confirmed based on the final specification sheet.
Thermal Stability
- Organic peroxides, including Perovion MEKP LLP, are thermally unstable substances and must be handled and stored with appropriate care at all times to avoid accidental decomposition.
- Self-Accelerating Decomposition Temperature (SADT): To be confirmed based on the final specification sheet.
Storage Recommendations
- Recommended maximum storage temperature: To be confirmed based on the final specification sheet.
- Store in a dry, well-ventilated area away from heat sources, direct sunlight, and incompatible materials.
- Keep containers tightly closed and stored upright to prevent leakage and contamination.
- Avoid contact with reducing agents, acids, alkalis, and heavy metal compounds such as cobalt, manganese, and other transition metal salts unless controlled accelerator dosing is intended.
- Rotate stock on a first-in, first-out basis and inspect containers periodically for signs of leakage or damage.
Packaging & Transport
- Standard Packaging: Available in approved industrial packaging, such as drums or IBCs; exact options to be confirmed based on the final specification sheet.
- Net Weight: To be confirmed based on the final specification sheet.
- UN Number: To be confirmed based on the final specification sheet.
- Transport Class: To be confirmed based on the final specification sheet.
- Certificate of Analysis (COA): Provided per batch upon shipment.
- Documentation: Labels and Safety Data Sheet (SDS) prepared in accordance with transport and destination regulations; industrial use only.
Perovion MEKP LLP: Safety & Handling
Perovion MEKP LLP should be handled in accordance with applicable safety procedures for organic peroxides. The product is classified as an oxidizing and thermally unstable material and requires appropriate storage, segregation, and handling measures to prevent accidental decomposition or contamination. Users are advised to review the Safety Data Sheet prior to handling and to implement suitable personal protective equipment and engineering controls, including eye protection, chemical-resistant gloves, and adequate ventilation in the work area.
Spills should be contained and cleaned up promptly using absorbent materials compatible with organic peroxides, and contaminated waste should be disposed of according to local regulations. Safety Data Sheet and destination-compliant labeling information for Perovion MEKP LLP are available upon request. For related products, see also Perovion MEKP L50 and Perovion MEKP L60.