Perovion MEKP L50R is a liquid organic peroxide based on methyl ethyl ketone peroxide (MEKP), formulated as a medium-reactivity, general-purpose curing agent for unsaturated polyester (UP) resin systems with a built-in red color indicator. Perovion MEKP L50R initiates free-radical crosslinking when combined with a cobalt accelerator, supporting room-temperature cure of promoted resins as well as elevated-temperature cure of unpromoted systems. The red color of Perovion MEKP L50R is visible during mixing and gradually fades as cure proceeds, giving fabricators a simple visual cue for dosing accuracy and cure progress, without requiring additional lab equipment or test procedures on the shop floor.
Perovion MEKP L50R 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 that determines the strength and speed of the curing reaction. Perovion MEKP L50R carries the same medium-reactivity, low-water-content profile as standard general-purpose MEKP grades, but incorporates a fading red indicator dye that allows operators to visually confirm thorough mixing and monitor the progress of cure without relying solely on gel-time timers or stopwatch-based scheduling.
As a liquid initiator, this grade is dosed volumetrically into resin batches using standard metering or hand-dosing equipment. It is compatible with the cobalt octoate or cobalt naphthenate accelerators typically used in unsaturated polyester and vinyl ester formulations, and it can be combined with common promoter and inhibitor packages to fine-tune pot life for a given production environment, and the vanishing red color helps operators quickly identify batches that have not been mixed thoroughly, reducing the risk of under-catalyzed resin reaching the mold, which can otherwise lead to soft spots, incomplete cure, or rejected parts downstream.
Key Features
- Visible Red Color Indicator: Perovion MEKP L50R is tinted red so that mixing quality can be checked visually, with the color fading progressively as the resin cures.
- Medium Reactivity for Balanced Processing: A moderate reactivity profile gives fabricators a workable window between pot life and gel time, reducing the risk of premature gelation during lay-up while still achieving practical demold times for production scheduling.
- Low Water Content: A controlled low water content supports consistent gel-time behavior and reduces the risk of surface defects such as pinholing in gelcoat and laminate applications where surface finish quality is critical.
- Dual-Mode Cure Capability: In addition to room-temperature curing of cobalt-promoted resins, this grade can heat-cure unpromoted unsaturated polyester resins at elevated temperatures, giving processors flexibility to switch between ambient and oven-cure production methods.
- Stable Viscosity for Routine Handling: A stable viscosity profile supports predictable metering and pumping behavior across day-to-day industrial dosing equipment, reducing calibration drift over the course of a production shift.
Typical Applications
Perovion MEKP L50R can be used in GRP/FRP laminating processes, composite panel production, hand lay-up and spray-up, and general-purpose casting resin applications, wherever a visible mixing indicator adds value for quality control on the shop floor. When paired with an appropriate accelerator system, it delivers predictable gel and cure profiles suitable for both open-mold and closed-mold composite processes, supporting consistent throughput across shifts and operators.
The fading red color is particularly useful in training environments and quality-audited production lines, where supervisors need a fast way to confirm that catalyst has been mixed evenly through a resin batch before it is applied to reinforcement. Common end uses include tanks, panels, gelcoat finishing layers, centrifugal casting, and general-purpose polyester casting resins used across a wide range of industrial and marine applications.
Technical Specifications
- Chemical Type: Methyl ethyl ketone peroxide (MEKP)
- CAS No.: 1338-23-4
- Physical Form: Liquid, red-tinted (fades during cure)
- Reactivity Level: Medium (moderate reactivity)
- Active Content: To be confirmed based on the final specification sheet.
- 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 this product, are thermally unstable substances and must be handled and stored with appropriate care at all times.
- 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.
- Never weigh out or transfer product in the storage room; use a dedicated dosing area instead, and rotate stock on a first-in, first-out basis to avoid extended ambient storage.
- Keep containers tightly closed and stored upright to prevent leakage and contamination.
- Avoid contact with reducing agents such as amines, acids, alkalis, and heavy metal compounds unless controlled accelerator dosing is intended, and keep incompatible materials segregated at all times.
Packaging & Transport
- Standard Packaging: Available in approved industrial packaging, such as HDPE containers; exact options to be confirmed based on the final specification sheet.
- Net Weight: To be confirmed based on the final specification sheet.
- UN Number: UN 3105 (indicative; to be confirmed based on the final specification sheet).
- Transport Classification: Organic Peroxide Type D, liquid, Division 5.2, Packing Group II (indicative; to be confirmed based on the final specification sheet).
- Certificate of Analysis (COA): Provided per batch, confirming active content and key quality parameters.
- Documentation: Labels and Safety Data Sheet (SDS) prepared in accordance with transport and destination regulations; industrial use only.
Perovion MEKP L50R: Safety & Handling
Perovion MEKP L50R 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 to prevent accidental decomposition or contamination during transfer and dosing. Users are advised to review the Safety Data Sheet prior to handling and to implement appropriate personal protective equipment and engineering controls, including eye protection, chemical-resistant gloves, and adequate ventilation in the mixing and dosing area.
Safety Data Sheet and destination-compliant labeling information are available upon request. For related products, see also Perovion MEKP L50 and Perovion MEKP L50A.