This flaw was rectified in 1940, the solution being to apply latex around the stitched areas to create a gas-proof seal. It was later feared that small amounts of deployed gas could seep through the stitch holes on the front. This was a structural weakness of the respirators' design. Vision was provided by a thin non-flammable celluloid sheet that was stitched into place. Many rubber producers were contracted for the facepiece including Avon, Henleys Tyre and Rubber co. An Izal solution (one or two eggcupsful of Izal/Izol to 3 gallons of water) was used to clean CD respirators, whereas manuals recommended a disinfectant comprising 2% Formalin (an aqueous solution of formaldehyde) for GCR cleaning. The masks sheet rubber was thin and fairly poor quality - many ARP manuals note that the same chemicals used to clean the Civilian Duty cannot be used to clean the GCR. Civilians were legally required to have their gas masks within reach at all times, and there was an extensive propaganda campaign designed to increase awareness. In subsequent years, the General Civilian Respirator was issued to every civilian by the government in the late 1930s and early 1940s.
Sadd on the 10th of January 1935, with the overall stated goal of an improved respirator which, by means of simplicity, could be easily mass produced and thus suited to civilian usage. The General Civilian Respirator first came into being from a patent filed by John A.
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