engineering

Tego film

Tego film is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Tego film rather than just read about it. In short: Tego film is an adhesive sheet used in the manufacture of waterproof plywood. It is applied dry and cured by heat, which allows for high-quality laminates that are free from internal voids and warping.

Key takeaways

Tego film belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Tego film to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Tego film from memory before moving on to harder problems.

Reference excerpt

Tego film is an adhesive sheet used in the manufacture of waterproof plywood. It is applied dry and cured by heat, which allows for high-quality laminates that are free from internal voids and warping. Tego film plywood products were used in aircraft manufacture in Germany during World War II, and the loss of the plant during a 1943 bombing raid was a serious blow to several aircraft projects. Tego film was an invention of the Essen, Germany, firm of Th. Goldschmidt AG [1] later Evonik Industries [2] ) .[3]

Development and use for plywood Tego film was developed as a glue for waterproof plywood. It comprised a paper sheet impregnated with a resole phenolic resin, [4] which was heated, assembled between wood veneers and then compressed, forming a strong and waterproof laminated plywood. Most plywood at this time used other adhesives, such as casein. 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. As Tego film was used dry, it gave a high-integrity result, solid, and without risk of hidden weaknesses. This became an important factor in time, when it was applied in aircraft construction. This adhesive was manufactured by Th. Goldschmidt AG Essen at their Wuppertal subsidiary.[5] By 1932, it was being exported worldwide.

Use for aircraft

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. This same construction, but with Aerolite, a urea-formaldehyde adhesive, achieved fame with its wartime use in the DH.98 Mosquito fast bomber. 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. When Germany attempted to emulate this aircraft with the Ta 154 Moskito, it used Tego film. Flight testing and development of the first Tego film-bonded prototypes from summer 1943 to 1944 was highly successful, but RAF bombing of Wuppertal in February 1943 (incidentally one of the first Oboe-equipped Pathfinder squadron bombing raids) had already destroyed the only Th. Goldschmidt AG factory producing Tego film. RAF squadron records show a second raid of 719 aircraft on the night of 29/30th May 1943 on Wuppertal with the primary objective being the Goldschmidt Tego film plant.[6]

For the production aircraft, an ersatz cold adhesive was used, produced by Dynamit AG of Leverkusen. During a test flight on 28 June 1944, one of the two aircraft broke up in flight. Investigation showed that the glue left an acidic residue after curing, that in turn damaged the structure of the timber. Mass production of the aircraft never took place after this. Another case of an aircraft design whose existence was threatened by the acidic replacement adhesive was the largely wood-structured Heinkel He 162 Spatz, the winner of Nazi Germany's last significant aircraft design competition, for a Volksjäger, or "people's fighter" single-engined, jet-powered fighter-interceptor as part of the Jägernotprogramm in the concluding months of the war.

Modern use Today, four factories produce Tego film: Surfactor in Germany, AICA in Japan, Kotkamills Imprex in Finland, and Dongwha in South Korea. Dongwha has bought Kotkamills Imprex. The bonding material is exported to plywood manufacturers all over the world.

See also Aerolite (adhesive) Redux (adhesive) Duramold

References

Illustrations

Worked examples

Example 1 — a first encounter with Tego film

Start with the simplest possible case. Write down what Tego film claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Tego film before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Tego film ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Tego film

In research: Tego film appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Tego film in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Tego film is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aerospace materials, Materials, Plywood, so understanding it makes those chapters shorter.
In everyday life: Look for Tego film outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Tego film in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Tego film means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Tego film out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Tego film in simple terms?

Why does Tego film matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Tego film?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Tego film.