Vintage MICA Sheet in Original Envelope – 2" x 3" – Early Industrial / Electrical Supply – Mid-Century Lab Material

Original mica sheet in labeled kraft envelope, measuring 2" x 3", likely from the mid-20th century. Mica was commonly used in scientific, optical, and electrical applications due to its insulating and heat-resistant properties. The sheet is translucent and flexible, and the packaging reads: “MICA – One Sheet – Size 2" x 3"”. A rare survivor of vintage industrial supply stock, perfect for collectors, restorers, or makers.