What kind of material is used for the that sunshield
Bring on the heat! 
#NASAWebb's 5-layer sunshield is the equivalent of sunscreen with 1 million SPF. By always blocking the Sun, it will keep the telescope's mirrors cold enough to detect faint heat signals in the universe: https://go.nasa.gov/3utNwTo 
#SunscreenDaypic.twitter.com/NjdJ9IEu0Q
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Good question! The sunshield is made out of a special material called Kapton, which has high heat-resistance and remains stable across a wide range of temperatures. The 2 outermost layers also have a treated silicon coating to reflect the sun's heat back into space.
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Hi guys, I made an educational YouTube video about the James Webb Space Telescope. I hope you like it:https://m.youtube.com/watch?v=XBEK_VO0qFQ …
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Each layer of the sunshield is incredibly thin. Layer 1 will face the sun and is only 0.05 millimeters (0.002 inches) thick, while the other four layers are 0.025 mm (0.001 inches)!
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I'm patiently waiting for this program to begin in space? It go without saying just how awesome the James Webb Telescope, (with no disregard whatsoever to Hubble, love our Hubble) is going to be ! Moreover the vista's we will see I can only assume will be awesomely inspirational
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When will it launch?
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