Performance
Permeability
0.000
Water vapor transmission of Zero Perm in a flat condition is 0.000 grams per hour per square meter. After sharp creasing under 25-lb. pressure at 3/4'' intervals with creases at right angles forming crease intersections at 3/4'' intervals permeance is only 0.0134 grams per 100 sq. in. per 24 hrs. Joints sealed with 1 1/2'' Zero Perm Pressure Sensitive Tape and joints overlapped 1 1/2'' and sealed with Alumiseal Zero Perm Adhesives also exhibit a permeance of 0.000 grams per lineal inch per 24 hrs. Test sources available on request.
UL listing
An important feature of Zero Perm is its performance in Underwriters Laboratories (UL) Surface Burning Characteristics Test (UL 723). Zero Perm is UL listed as follows:
| Flame spread | 5 |
| Fuel contributed | 0 |
| Smoke developed | 5 |
Note: The numerical flame spread ratings are not intended to reflect hazards presented by this or any other material under actual fire conditions.
Flex life
Zero Perm's outer mylar layer can endure over 20,000 cycles of flexing without failure.
Thermal stability
Zero Perm remains flexible and stable over a temperature range from -100° F to +300° F
Tensile-strength
Has a tensile strength of over 25,000 psi, a bursting strength of 96.6 psi. It requires a 23,500 psi stress at 130% strain to cause an elongation break in the mylar outer laminate.
Inertness
Zero Perm exhibits excellent inertness to water, salt spray, wet mortar, caustics plus chemical solvents, oils, greases and can be safely applied to masonry walls.
Resistance to abrasion
Zero Perm has extremely high resistance to abrasion.