Clear adhesive tape is produced by subjecting a BOPP (biaxially oriented polypropylene) base film to high-voltage corona treatment, coating the roughened surface with adhesive, and then slitting the material into the small rolls used in daily life. The adhesive used is an acrylic-based substance—also known as pressure-sensitive adhesive—composed primarily of esters.
Generally speaking, clear adhesive tape is not considered toxic. While the adhesive itself can contain harmful substances—such as small amounts of benzene—the toxicity level is relatively low. Biting the tape with your teeth typically poses no immediate danger, though doing so habitually is not recommended to avoid the potential accumulation of toxins.
To reduce production costs, some manufacturers mix chemical additives into the adhesive. Tapes containing such additives often emit a foul odor when torn open by hand.
