Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 133,393 pages of information and 211,464 images on early companies, their products and the people who designed and built them.
of Hermetic Works, Ryland Street, Birmingham, 16. Telephone: Edgbaston 2342. Cables: "Hermetic, Birmingham". (1929 and 1937)
1895 Hermetic Rubber began manufacturing precision rubber products.
Originally Hermetic was named the Self Sealing Air Chamber Co, manufacturing the products its name suggested.
1900-1940s Sometime in this period they were makers of horns, bulbs and rubber tubing.
1928 Patent - Improvements in cricket or like balls.
1929 British Industries Fair Advert for the 'Hermetic' Cricket and Hockey Ball. Patented and constructed of best rubber-proofed fabric to standard size, weight and resilience. Also moulded Rubber Goods of all kinds for sports and general trades. (Sports Goods Section - Stand No. B.48) 
1937 Listed Exhibitor - British Industries Fair. Moulded and Mechanical Rubber Goods of every description. Hoses of all descriptions. Rubber Road Studs for Pedestrian crossings. "Hermetic" Flexible Couplings. "Hermetic" Mud and Stone Deflectors. (Stand No. B.313) 
1939 Patent - Improvements in or relating to rubber and like buffers.