Common duct tape can do many things. Don't try to use it for actual duct work or this may happen.

Common duct tape can do many things. Don't try to use it for actual duct work or this may happen.

Duct tape is cloth- or scrim-backed pressure-sensitive tape often coated with polyethylene. There are a variety of constructions using different backings and adhesives.

One variation is gaffer tape designed to be cleanly removed, while duct tape is not.

Duct tape should not be confused with special tapes actually designed for sealing heating and ventilation ducts.

To provide laboratory data about which sealants and tapes last, and which are likely to fail, research was conducted at Lawrence Berkeley National Laboratory Environmental Energy Technologies Division.

Their major conclusion was that one should not use common duct tape to seal ducts (they had defined duct tape as any fabric-based tape with rubber adhesive).

The testing done shows that under challenging but realistic conditions, common duct tapes become brittle and may fail.

(Source)

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