HC Deb 19 March 1937 vol 321 cc2459-60W
Mr. Creech Jones

asked the Home Secretary what is the flocculent material which is being used as a filter for smokes in the gas-masks now being manufactured in Blackburn for free distribution to the civilian population; and what, if any, has been the percentage of smoke which has passed through this material when subjected to experiments?

Mr. Lloyd

The material employed as a filter for smokes in the gas masks now being made at Blackburn for distribution to the civilian population consists of a mixture of wool and asbestos. Extensive tests with toxic smokes have proved that the respirator will afford protection against all such poison gases under the conditions which would arise in practice.