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Protruding gap fillers had been identified as an issue on previous flights, notably STS-28. A post-flight analysis [11] identified that a gap filler was the likely cause of the high temperatures observed during this re-entry. Protruding gap fillers were also seen on STS-73.
Some of these gaps were safe, but there were some areas on the heat shield where surface pressure gradients caused a crossflow of boundary layer air in those gaps. The filler materials were made of either white AB312 fibers or black AB312 cloth covers (which contain alumina fibers).
At T+81.9 seconds, the foam struck the reinforced carbon–carbon (RCC) panels on Columbia ' s left wing at relative velocity of 625 to 840 feet per second (426 to 573 mph; 686 to 922 km/h). [5]: 34 The foam's low ballistic coefficient caused it to lose speed immediately after separating from the ET, and the orbiter ran into the slower foam.
If your window has gaps larger than 1/2 inch, caulk may not work well. If these gaps are deep, expanding foam insulation designed for window and door use may be necessary to fill the cavity.
"Most gaps and cracks are fairly minor and can be fixed with weatherstripping, caulk, or expanding foam. They also make thermal insulating tape that can be applied around windows, doors, ceilings ...
The gap filler was not from an area which has been modified since STS-114; it had been with the vehicle since 1982. The height and location of the gap filler was to be investigated further and, if necessary, dealt with using the procedure established and proven by STS-114 , during a spacewalk.
Seals often give out faster than windows, as the foam, caulking, or weather stripping breaks down over time. Look out for gaps where caulking or sealant has pulled away from the window frame ...
Spray foam insulation or spray polyurethane foam (SPF) is an alternative to traditional building insulation such as fiberglass. A two-component mixture composed of isocyanate and polyol resin comes together at the tip of a gun, and forms an expanding foam that is sprayed onto roof tiles, concrete slabs, into wall cavities, or through holes ...
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