A 4-inch foil tape (30MU) is a specialized aluminum adhesive tape manufactured with a 30-micron nominal thickness foil backing and a high-tack acrylic adhesive. Designed for heating, ventilation, and air conditioning (HVAC) systems, it provides a vapor-tight seal along ductwork seams, joints, and thermal insulation facings. Its flame-retardant, moisture-resistant, and heat-reflective properties ensure durable temperature protection, while the broad 4-inch (100mm) width offers extensive coverage for heavy-duty sealing and insulation tasks across commercial facilities and industrial maintenance operations.