Respro develops their masks from the technology used in the industrial market, including the Defence Establishment for the protection of military personnel.
Respro masks use material used in the industrial market for the protection of workers who would be putting their health at risk in their work environments if they failed to wear adequate protection.
Respro used the same testing procedures for its products to ensure that they do work.  Detailed analysis of filtration and performance are measured to decide the ability of the product.
Hospital staff who use anaesthetic gases for patients in surgery, people who use cleaning agents that give off posonous fumes, people who remove asbestos material from old building and so on, all wear masks for protection.
The fire services also use Respro products in the UK, and in North America, both have strict controls over the use of any equipment that they specify for their use.