PE-M4531 is a 1.5 mils polyester film with an acrylic adhesive. Performs well in both cold and warm weather. Good conformability to irregular surfaces. Excellent for sealing joints and seams of foil-faced reflective insulation materials and seeming of all house-wraps. Excellent initial and long-term adhesion, chemical and thermal stability, and excellent adhesion to low energy and hard to adhere to surfaces.