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NOROX® 925 MEKP Catalyst for Polyester & Vinyl Ester Resins
NOROX MEKP 925 (ANDONOX LCR-S) – Polyester & Vinyl Ester Resin Catalyst
NOROX MEKP 925 (ANDONOX LCR-S) is a professional-grade methyl ethyl ketone peroxide (MEKP) catalyst designed for curing compatible unsaturated polyester and vinyl ester resin systems.
Particularly suited to vinyl ester resins, NOROX 925 also delivers reliable curing performance with compatible general-purpose orthophthalic and isophthalic polyester resins.
Its liquid formulation allows accurate dosing and consistent incorporation into resin systems for fibreglass manufacturing, marine applications and industrial composite fabrication.
Key Features & Benefits
Professional-grade MEKP catalyst for polyester and vinyl ester resins.
Particularly suited to vinyl ester resin systems.
Reliable and consistent curing performance under controlled processing conditions.
Liquid formulation for accurate measuring and mixing.
Suitable for fibreglass laminating, moulding and composite manufacturing.
Compatible with selected marine, industrial and general-purpose resin systems.
Typical Applications
Marine fibreglass manufacturing and boat building.
Vinyl ester resin laminating.
Polyester resin laminating.
Chemical-resistant tanks and industrial pipework.
Fibreglass moulding and composite fabrication.
Automotive and transport components.
Gelcoat applications where approved by the resin manufacturer.
Technical Specifications
| Property | Typical Value |
|---|---|
| Product | NOROX MEKP 925 |
| Alternative Name | ANDONOX LCR-S |
| Catalyst Type | Methyl Ethyl Ketone Peroxide |
| Appearance | Water-white liquid |
| Active Oxygen | 9.0% maximum |
| Specific Gravity @ 25°C | 1.10 |
| Recommended Storage Temperature | Below 27°C |
| Pack Size | 3.6 kg |
Mixing & Curing
NOROX MEKP 925 is used to initiate curing in compatible polyester and vinyl ester resin systems.
The required catalyst concentration depends on the resin formulation, ambient temperature, application method and desired gel time.
Always follow the resin manufacturer's recommended catalyst dosage and processing instructions.
Never mix MEKP directly with accelerators or promoters.
Handling & Storage
NOROX MEKP 925 is an organic peroxide and must be handled with appropriate care.
Wear suitable protective clothing, chemical-resistant gloves and eye protection.
Store in a cool, well-ventilated location away from direct sunlight, heat and incompatible materials.
Prevent contamination of the catalyst and its original container.
Refer to the current Safety Data Sheet for complete handling, storage and emergency information.
