Features of Mylar Tape


Mylar or polyethylene terephthalate, which was first developed in 1950s, quickly replaced cellophane during the 1960s. By the 1970s, the handling qualities of Mylar opened new consumer markets including photography, magnetic audio and video tape, electrical components, and medicine. And the properties of Mylar explain the useful diversity of this 21st century product.

Known for its durability and strength, the service life of Mylar depends on how much severe stretching and bending it experiences. Severe flexing is the time required to reach 10 percent elongation under different humidity and working temperature resulting in decreased service life. Typically, compromising the dimensional stability with too much strain, too much heat, or leaving Mylar in water too long also decreases the service life. However, coating or enclosing Mylar prolongs its beneficial uses.

Generally, the recommended temperature for Mylar is 302 degrees Fahrenheit for maximum service while retaining all properties. Severe or extensive heat exposure may require reducing service temperatures to Mylar. Heating Mylar 428 degrees Fahrenheit for 30 minutes costs nearly 10 percent of its tensile (bend and stretch) strength. Heated for less than a minute at 455 degrees Fahrenheit makes Mylar turn brittle and shatter. While special coatings to the film increases Mylar's resistance to heat.

Over exposure to humidity under high temperatures causes decomposition of Mylar reacting to water (hydrolytic stability). Heating Mylar at 320 degrees Fahrenheit for four hours removes any damaging moisture absorbed by the film. Enclosing Mylar in an airtight container ideally frees the plastic film from of any over exposure to unwanted moisture.

Mylar's ability to stretch and return to its normal state (tensile strength) makes it a diverse product. Various temperatures affect the typical 38 hundreds ratio before yield and 58 hundreds after yield properties of Mylar. Using manufacturing guides included with the product allows for necessary adjustments and precautions when using Mylar under higher temperatures.

The scale of the load, the time applied, and the temperature determine the "creep" or deformation of Mylar film. Under testing, Mylar shows no large levels of creep. In a 212 degree Fahrenheit oven after 4,000 hours, 35 hundred millimeter gauge and 50 100,000 lbs. per square inch Mylar Tape experiences an insignificant creep of 9/10 percent.