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Mekp is the name usually used for peroxides used as hardeners for polyester resin. Mekp hardener is the abbreviation for methyl ethyl ketone peroxide. For more info, see: https://www.v-sure.eu/en/products/ancillaries/hardener/

The modulus of elasticity is a measure of the elasticity of a material. It is a material-dependent constant that indicates the relationship between the relative length change of the material and the applied stress, below the elasticity limit. The modulus of elasticity indicates the slope of the first part of the stress-strain diagram.