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Warning-33-512 Filters listed in this article are known to contain materials hazardous to health
Exercise caution when handling and storing.
Refrain from using these filters.
Seek medical advice if you have any concerns.

The Siebe Gorman Puretha was an industrial conversion of leftover Mk IV General Service Respirator and Mk V General Service Respirators from world war two. The exact contents of the filters are not 100% known, however it is to be assumed that they contain dangerous materials. Aside from this they are all at lest 50 years out of date.  

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