The P.C. 30 was made of thin green rubber and it used the standard italian 5 elastic straps system. The mask sported a twin exhale valve system which used a simple rubber disc, one for each cheek. Its filter was connected through an unusual 30 mm filter intake at the bottom of the mask. The later masks' filter intakes would sport the more standard 40 mm thread.
The filter was made with various blocking substances in two layers, one of which was made of cellulose, which was regarded as very hard to breathe through. The filter itself was openable, allowing users to change the cottom layer and the other parts. To use the filter, the user was required to remove the card layer over the filter's intake.
This type of filter was discarded as new blocking substances were developed, and no other filter would be openable like this kind.
The P.C. 30 is the first ever italian mask designed for the civilian population and civilian duty, before the main gas mask companies started selling their products to the civilians. The mask was used mainly for training the population on how to operate a gas mask.
Two photographers taking a photo of themselves while wearing Belgian P.C. 30 masks
From left to right: S.I.P. 2 without exhale valve, S.I.P. 2, P.C. 30, S.I.P. 3, unknown (possibly a P43, a P44, or a P.C.30 made with beige rubber)
Two people enjoying themselves while wearing M30 chemical suits and P.C. 30 masks to protect themselves against blister agents
This kind of mask was produced both in italy by Pirelli and in Belgium by L'Anti-Gaz, a Pirelli branch, which used the standard double layerd rubber for the face piece (with the inside made of smooth rubber and the outside made textured) and produced its own proprietary 30 mm filters. This mask of unknown designation came in the same container as the P.C. 30, marked Anti-Gaz instead of Pirelli.
Belgian P.C. 30 with its kit
Close up of the Belgian P.C. 30 face piece's exhale valves and thread