Methyl Ethyl Ketone Peroxide (MEKP) remains one of the most widely used catalysts for curing unsaturated polyester resins (UPR) and vinyl ester resins in FRP manufacturing, pultrusion, coatings, and composite production. However, due to its strong oxidizing properties and high sensitivity to temperature and contamination, selecting the correct MEKP grade—and handling it safely—is critical for every factory.
As global safety regulations tighten and resin systems evolve, manufacturers are reevaluating how they choose, store, and transport MEKP in order to protect workers, ensure consistent curing performance, and comply with international standards.
Understanding MEKP Grades: Why the Right Choice Matters
Different manufacturing processes require different MEKP specifications. Common variations include:
- Low-active oxygen (low AO) MEKP for general FRP molding
- High-active oxygen MEKP for faster gel and shorter curing time
- Low-odor or low-hazard formulations
- Stabilized MEKP for improved storage safety
- Gelcoat-grade MEKP designed for consistent surface curing
Choosing the wrong grade can lead to issues such as slow curing, surface tack, excessive exotherm, or even product defects.
Experts emphasize that factories should always match MEKP selection to:
- Resin type (UPR, VER, special formulations)
- Production environment temperature
- Required gel time & curing speed
- Safety requirements and plant regulations
Safety: The First Priority in MEKP Handling
MEKP is classified as a Class 5.2 Organic Peroxide, meaning it can decompose violently if exposed to excessive heat, contaminants, or incompatible materials.
Factories are urged to follow strict safety measures:
- Use HDPE, PP, or glass containers only
- Avoid contact with metal contaminants like iron, copper, or cobalt
- Ensure good ventilation in MEKP handling areas
- Train workers in emergency response procedures
- Provide PPE: goggles, gloves, chemical-resistant clothing
Even a small amount of contamination can cause the peroxide to self-accelerate, increasing risk of fire or explosion.
Storage Guidelines: Preventing Decomposition and Hazards
Proper storage extends MEKP shelf life and protects factory personnel.
Key recommendations include:
✔ Temperature Control
- Ideal storage: 10–25°C (50–77°F)
- Avoid sunlight and heat sources
- Use insulated storage in hot climates
✔ Approved Storage Rooms
- Fire-resistant construction
- Explosion-proof ventilation
- No smoking or ignition sources
- Segregation from other chemicals
✔ Container Requirements
- Keep MEKP in original UN-approved containers
- Do not store near reducing agents, accelerators, or metal powders
- Ensure containers are tightly closed to avoid contamination
Transportation: Complying With Global Hazardous Goods Regulations
MEKP is regulated under:
- UN 3105, Organic Peroxide Type D, Liquid
- IMDG Code for sea transport
- ICAO/IATA for air transport
- ADR/RID for road and rail transport
Compliance includes:
- Proper UN-certified packaging
- Type D hazard labels
- Temperature-controlled transport (in hot climates)
- Trained dangerous goods handlers
Factories should only work with logistics partners experienced in organic peroxide handling.
Thousands Technology Co., Ltd Provides Reliable MEKP Solutions
As global composite and resin industries expand, Thousands Technology Co., Ltd supports manufacturers with:
- High-purity MEKP catalysts for UPR/VER
- Low-odor and stabilized grades
- Gelcoat-grade MEKP for premium surface finishing
- UN-approved safe packaging
- Technical guidance for curing optimization
With strict QC systems, safe logistics partners, and professional support, Thousands Technology ensures MEKP is delivered safely and performs reliably in customers’ factories.
Choosing the right MEKP catalyst is no longer just a technical decision—it’s a crucial step in ensuring factory safety, product quality, and compliance with international standards. With proper selection, safe storage, and regulated transportation, manufacturers can significantly reduce risk and improve curing efficiency.
