Five different duct tapes are offered by this Texas company, all with Underwriters Laboratories' code classifications. HDT-519 is used for plumbing cap-offs and vinyl-pad seaming. It meets UL 723 requirements and is available in both black and silver. HDT-520BPT and HDT-520MPT are black- and silver-cloth premium-grade duct tape, designed for use on Class 1 flexible duct. They are both UL 181B-FX listed for uses that require high tensile strength and strong adhesion. HDT-442 is an all-weather duct tape recommended for HVAC and refrigeration system applications. It meets UL 723 requirements. HDT-443 is used for sealing and patching foil, scrim or kraft boards and blankets, and meets UL 723 requirements.
Carlisle Hardcast, 900 Hensley Lane, Wylie, TX 75098; (800) 527-7092.