COPACO-125 Super Stretch insulating papers are manufactured under an extensible paper process that provides this material with twice the stretch of ordinary electrical insulating papers. This unusual elongation permits Copaco-125 to stretch and absorb energy when subjected to extreme stress. - COPACO-125 Ragpaper is a very robust electrical insulation presspaper with extremely high tensile, elongation, tear, burst and dielectric properties. The extensible paper process is entirely mechanical and in no way affects the high purity or chemical properties.