According to the MSDS, they don't contain silica (think of combined effects), but I think with a health hazard rating of 2, I'd still leave it and would look for less harmful ones.
3M recommends: "Select one of the following NIOSH approved respirators based on airborne concentration of contaminants and in accordance with OSHA regulations: Half facepiece or fullface air-purifying respirator with organic vapor cartridges and P95 particulate prefilters, half facepiece or fullface air-purifying respirator with P95 particulate filters."
Nevertheless, if the material works flawlessly, everyone can use it - with the necessary precautions.