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Duct tapes offer triple-layer construction consisting of a polyethylene plastic backing for waterproofing, a cloth middle layer that provides strength and affords a straight tear and a rubber-based adhesive for durable holding power. Economy duct tapes offer good adhesion in short-term, low-stress applications on relatively clean surfaces with light weather exposure. Multi purpose tapes have a higher thread count for greater strength, a thicker PE backing for increased durability and more adhesive for better holding power. Premium-grade tapes are constructed for long-term, demanding applications. They often contain additives or special formulations, which provide resistance to sunlight and harsh conditions.
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