Authenticity Guarantee
This is an original period advertisement from the September 5, 1952 issue of The Aeroplane magazine. It is not a modern reproduction and will be supplied flat in an archival sleeve, making it an excellent item for framing or adding to an aviation display collection.

About the Item
The advert features a detailed technical line drawing illustrating the beaching-chassis floatation-chambers of the Saunders-Roe "Princess" flying-boat. Highlighted in the advert are the materials used for buoyancy: "Onazote," a permanently buoyant expanded ebonite, used in canvas-covered blocks, and "Rubazote," a soft expanded rubber used for sealing-rings and strips for portlights and doors. The drawing depicts part of the aircraft's landing gear mechanism suspended beneath the hull, emphasising the practical application of these materials in aviation engineering.
This advertisement is from the expanded rubber manufacturer, Expanded Rubber Company Limited (ERC), a subsidiary of the British Xylonite Company Ltd, located at Mitcham Road, Croydon. The technical claims stress the buoyancy and resilience properties of "Onazote" and "Rubazote," underscoring their importance in the structural and safety elements of the iconic flying-boat. The Saunders-Roe Princess was a notable British flying-boat of the post-war era, designed for long-range passenger service, and this advert relates specifically to its innovative buoyancy engineering.

Details
Manufacturer: Expanded Rubber Company Limited (ERC)
Aircraft Featured: Saunders-Roe Princess Flying-Boat
Publication: The Aeroplane
Publication Date: September 5, 1952
Headline: Onazote & Rubazote in the Saunders-Roe "Princess" flying-boat
Condition: Vintage original; excellent archival quality
Dimensions: Standard magazine page size (approx. 8 x 10 inches)

A striking and historically significant aviation advertisement perfect for collectors of vintage British aviation, flying-boat history, or mid-20th century aeronautical materials engineering.

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