Aluminized mylar

Multilayer Insulation Miiltilayer insulation consists of alternating layers of highly reflec ting material, such as aluminum foil or aluminized Mylar, and a low-conduc tivity spacer material or insulator, such as fiberglass mat or paper, glass fabric, or nylon net, all under high vacuum. When properly applied at the optimum density, this type of insulation can have an apparent thermal conduc tivity as low as 10 to 50 jlW/m-K between 20 and 300 K. 

Superinsulation has been developed, primarily for use in space, where protection is needed against external temperatures near absolute zero. Superinsulation fabric consists of multiple sheets of aluminized mylar, each about 0.005 cm (about 0.002 in.) thick, and separated by thin spacers with about 20 to 40 layers per cm (about 50 to 100 layers per in.). 

Figure 1 Schematic representation of the aluminized Mylar surface. The polymer side of the film is used for the adsorption studies.

Because the CdTe detector was not visible through the aluminized mylar film, it was necessary to check for proper... 

A1 window (AW), and e scintillators (ej and e2). The aperture electrode, the microchannel plate, and one pair of field coils have been omitted in order to simplify the picture. The inset shows a horizontal view of the target region with the u+ scintillator (S), aluminized mylar foil (AM), Si02 target (T), aperture electrode (A), and microchannel plate (M). 

Dacron fiber is used to make fabric and tire cord, and Mylar film is used to make magnetic recording tape. Mylar film is strong, flexible, and resistant to ultraviolet degradation. Aluminized Mylar was used to make the Echo satellites, huge balloons that were put into orbit around the Earth as giant reflectors in the early 1960s. Polyethylene terephthalate) is also blow-molded to make plastic soft-drink bottles that are sold by the billions each year. 

The containers used for transporting and storing the majority of cryogenic liquids are insulated cryogenic tankers, liquid cylinders, and stationary storage tanks. These containers are similar in design to a Thermos bottle. There is an inner vessel, which contains the cryogenic product, and an outer vessel. The space between the two vessels is under a vacuum and usually contains a wrapped insulation material such as aluminized Mylar, or it may contain a powdered insulation such as expanded perlite. The liquid cylinders, usually 160-250 L in capacity, are constructed to a... 

We have studied the effect of water and sodium chloride (NaCl) on aluminized Mylar. We suggest that the reaction between water and both aluminum and its native oxide is an important step leading to the corrosion of the metallic... 

Mass Spectrometiy. Samples were introduced into a Californium-252 time-of-flight plasma desorption mass spectrometer in a 1% TFA solution applied to a nitrocellulose-covered aluminized Mylar foil. TTie samples were run at 15 kV accelerating volts with a 30-cm flight path, and the signal was accumulated for 19 hr (1),... 

Radiation simulating solar radiation was given by a bank of four G.E. 40-watt cool white fluorescent lamps and two Westinghouse 400-watt EHl mercury vapor lamps mounted on one wall of the chamber. The walls of the chamber were covered with aluminized Mylar which provided a reflecting surface. (j>ka for NO2 was 2.8 hr ... 

Alpha (a) Thin sheet of plastic scintillator or zinc sulfide embedded in a transparent tape Phosphors are wrapped in very thin aluminized mylar foil to exclude light. a-Particles, because of low penetrating power, lose all their energy to scintillators. P- and y-Particles produce only smaller pulses and by adjustment of appropriate setting of the discriminator, a-Particles alone can be counted. 

In order to evaluate the contraction behavior of the candidate liner material when coupled to a laminate composite, a simple immersion test was performed on selected samples. The specimens were immersed in a liquid-hydrogen bath for 45 min upon removal they were subjected to a qualitative examination, for cracks, color change, etc. All films tested reacted favorably except the aluminized Mylar, which developed cracks in the aluminum upon flexing, and Kynar, which was very brittle and cracked without external load. Contraction properties of various materials are shown in Fig. 3. 

Aluminized Mylar (0.00025 in.) 11 Bond between film and laminate O.K. — cracks in aluminum coating Same as above Same as at 10% Bad cracks in laminate—specimen failed on 5th cycle Testing stopped... 

The potential for corrosion caused by adhesives requires evaluations in both cured and uncured states. In one test, the adhesive components or the cured adhesive are applied to aluminized-Mylar film and examined after 48 hours for etching or transmittance of light through the Mylar. A second test involves embedding copper wire with the adhesive and measuring corrosion by resistance changes in copper wire. Because of the wide variety of tests and the fact that they are closely related to adhesive reliability issues discussed in Chapter 6, the reader is referred to that chapter. 

AISI 304 and 316 Stainless steels. Tough at 4 K. Relatively Superinsulation (1) Aluminized Mylar sheet (2) hollow... 

Corrosivity No change in light transmittance of aluminized Mylar 3.3.4 Sample on aluminized Mylar (48 hrs) 4.5.7... 

Aluminized Mylar, a thermal superinsulation no tests except appearance and weight change. 

---