Nouryon Butanox LPT-IN Methyl ethyl ketone peroxide in diisononyl phthalate 1338-23-4

Butanox LPT-IN

Methyl ethyl ketone peroxide in diisononyl phthalate

CAS No. 1338-23-4

Physical form: liquid

Butanox® LPT-IN is a general-purpose MEKP that achieves ultra-long gel times in standard phthalate resins and is the product of choice for curing vinyl ester resins.


Butanox® LPT-IN is a methyl ethyl ketone peroxide (MEKP) for curing unsaturated polyester resins in the presence of cobalt accelerators at room and elevated temperatures. Butanox® LPT-IN has a significantly longer gel time than most other ketone peroxides, making it particularly suitable for applications requiring longer gel times or production times, such as the production of large parts and fiber winding. Butanox® LPT-IN is also of particular interest in areas with high ambient temperatures. Butanox® LPT-IN is particularly recommended for the curing of vinyl ester resins. This MEKP formulation produces less "blistering" than standard MEKP. Years of practical experience have proven that Butanox® LPT-IN guarantees a low water content and the absence of polar compounds, which makes it very suitable for GRP products, e.g. for marine applications. The low hydrogen peroxide content of Butanox® LPT-IN makes this peroxide ideal for curing gelcoats that are susceptible to microporosity due to hydrogen peroxide decomposition.

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