Butanox LPT-IN is a methyl ethyl ketone peroxide (MEKP) for curing unsaturated polyester resins in the presence of a cobalt accelerator at room and elevated temperatures. As one of the recommended international brand products in our organic peroxide range, it is supplied with supply chain resource support for fabricators sourcing slow-gelling curing systems for filament winding, marine, and vinyl ester applications.
Product Specifications
Specifications
| Active oxygen | 4.84-4.98 % |
| Appearance | Clear colorless liquid |
Characteristics
| Density, 20 °C | 1.017 g/cm³ |
| Viscosity, 20 °C | 32.4 mPa.s |
Key Benefits of This MEKP Curing Agent
- Significantly longer gel time compared to most other ketone peroxides
- Especially recommended for curing vinyl ester resins
- Less foaming than standard MEKP formulations
- Guaranteed low water content and absence of polar compounds for GRP marine applications
- Low hydrogen peroxide content, reducing gelcoat microporosity risk
Applications Across Industries
Butanox LPT-IN supports a wide range of end-use applications across several industries:
- Marine: GRP hull and deck laminates requiring low water content and polar-compound-free curing
- FRP pipe & tank: filament winding of large-diameter pipes and vessels
- Construction: large cast and laminated parts requiring extended production time
- Automotive parts: vinyl ester resin curing for corrosion-resistant components
This range of applications reflects why this MEKP is specified across both slow-gelling large-part production and marine GRP work, giving fabricators a curing agent suited to processes where standard MEKP gel times are too fast.
Why the Long Gel Time Matters
Butanox LPT-IN gives a significantly longer gel time compared with most other ketone peroxides, which makes it particularly suitable for applications where a long gel time or production time is required, such as the production of large parts and filament winding. Extended gel time gives operators more working time to complete resin impregnation and fiber placement before the resin begins to set, which matters on large or complex parts where a fast-gelling MEKP would risk premature curing before layup is complete.
It is also of particular interest in areas with high ambient temperatures, since elevated temperature normally accelerates gel time. The extended baseline gel time of this MEKP helps offset that acceleration, giving fabricators a more workable and predictable cure window even in warm production environments.
Why This MEKP Suits Marine and Vinyl Ester Applications
Practical experience over many years has proven that the guaranteed low water content and the absence of polar compounds make Butanox LPT-IN very suitable in GRP products for marine applications, where osmosis resistance and hull durability are critical concerns. Butanox LPT-IN is also especially recommended for the curing of vinyl ester resins, which are widely used in marine and chemical-resistant composite construction.
This MEKP formulation gives less foaming than standard MEKPs, which supports cleaner laminate quality with fewer entrapped air voids during curing. Fabricators working with vinyl ester resin systems for marine or corrosion-resistant applications should evaluate this MEKP alongside their specific gel time and cure temperature requirements.
Reducing Gelcoat Microporosity
The low hydrogen peroxide content of Butanox LPT-IN makes this peroxide very suitable for the cure of gelcoats that tend toward microporosity caused by the decomposition of hydrogen peroxide. Gelcoat microporosity can lead to visible surface defects and reduced water resistance, so selecting a curing agent with lower hydrogen peroxide content can help fabricators reduce this specific defect mode on visible gelcoat surfaces.
What to Consider When Sourcing This MEKP
When sourcing Butanox LPT-IN, fabricators typically evaluate active oxygen content, gel time, and viscosity data alongside their specific resin system and target production schedule. Working with a supplier that can provide consistent documentation and responsive technical support can help reduce qualification time when approving a new peroxide grade for a production line.
Buyers switching between MEKP grades or suppliers should confirm current active oxygen and gel time specifications for their specific resin and accelerator combination, since gel time and foaming behavior can shift meaningfully between nominally similar MEKP products.
General Handling and Storage Guidance
As with most organic peroxide products, this MEKP should be stored in a cool, well-ventilated location away from direct sunlight, heat sources, and incompatible materials such as accelerators or reducing agents, and used within the manufacturer’s recommended shelf life. Because organic peroxides are reactive materials, storage temperature and segregation from accelerators are important handling considerations.
Shelf life and specific storage temperature limits vary by batch and packaging format, so fabricators should always confirm current shelf life, recommended storage temperature, and handling precautions against the latest technical data sheet and safety data sheet for the specific batch they are working with.
Choosing Between Butanox LPT-IN and Other MEKP Grades
Thousands Chemicals also supplies Butanox M-50, Butanox M-60, and Trigonox V388, which are positioned for different gel time and application requirements within the same general MEKP family. While Butanox M-50 and Butanox M-60 are formulated for standard and medium-reactive cure profiles, Butanox LPT-IN is specifically positioned for extra-long gel time applications such as filament winding and large-part production.
Selecting between these grades depends on target gel time, production part size, and whether vinyl ester curing or gelcoat microporosity resistance is a specific requirement. Our team can help match the correct MEKP grade to your resin system and production schedule.
Where to Source This Product
Thousands Chemicals supplies Butanox LPT-IN and related organic peroxide products through our digital B2B marketplace, with supply chain resource support for fabricators sourcing slow-gelling curing systems for filament winding and marine applications. Peroxide handling and classification are commonly referenced against guidelines published by ASTM International. Our team can help confirm packaging, lead times, and technical documentation for your target application and order volume.
Documentation We Can Provide
For buyers evaluating this MEKP for a new filament winding, marine, or large-part project, our team can help arrange the current technical data sheet and safety data sheet. Having this documentation in hand before finalizing a curing schedule can help avoid delays later in your qualification or approval process.
Frequently Asked Questions About Butanox LPT-IN
What is the active oxygen content of Butanox LPT-IN?
It has an active oxygen content of 4.84 to 4.98%, with a density of 1.017 g/cm³ and viscosity of 32.4 mPa.s at 20°C.
Is this MEKP suitable for marine applications?
Yes, its guaranteed low water content and absence of polar compounds make it very suitable in GRP products for marine applications.
What applications is it best suited for?
It is best suited for filament winding, large-part production, high ambient temperature environments, and curing of vinyl ester resins and microporosity-prone gelcoats.
Can you provide technical documentation and bulk pricing?
Yes, technical data sheets and SDS documentation are available on request, and our team can provide bulk pricing and lead times based on your target volume and delivery location.
Get a Quote for Butanox LPT-IN
Contact our team for a quote, technical data sheet, or SDS for this MEKP. We support bulk supply and global shipping for fabricators sourcing consistent, slow-gelling curing systems for filament winding, marine, and vinyl ester production.
