All Hendrix HPI Insulators are manufactured from a proprietary blend of gray, track resistant, high-density polyethylene Tie Top, Vise Top, and Line Post Insulators are tested in conformance with the ANSI C29 series of specifications and exhibit superior electrical and mechanical characteristics compared to wet process porcelain. They have greater leakage distance, higher flashover and impulse values, are lightweight, vandal resistant, won’t chip, crack, or break, are a green recyclable product,
and are made in the USA.