Tego film

It comprised a paper sheet impregnated with a resole phenolic resin,[1] [4] which was heated, assembled between wood veneers and then compressed, forming a strong and waterproof laminated plywood.

These adhesives were generally applied as aqueous solutions, which caused warping of thin veneers and made achieving a solid laminate without risk of voids difficult.

[1] The de Havilland Albatross airliner of 1936 had a fuselage of wooden sandwich construction; wafers of birch plywood were spaced apart by a balsa sheet and glued by a casein adhesive.

As well as being a construction of light weight and high performance, it also avoided the use of aluminium, a strategic material during wartime, and could use the skills of woodworkers, rather than those of specialised aircraft metalworkers.

Today, four factories produce Tego film: Surfactor in Germany, AICA in Japan, Kotkamills Imprex in Finland, and Dongwha in South Korea.