3M™ Secure Click™ Hard Case Particulate Filter P3 R, with Nuisance Level Organic Vapour/Acid Gas Relief, D9038 (Box of 10 Pairs)3M Secure Click Hard Case Particulate Filter D9038, P3 R, is approved for use with 3M Secure Click Half Facepiece Reusable Respirator HF 800SD Series for certain particulates, Hydrogen Fluoride up to 30 ppm and nuisance level organic vapour and acid gas relief in environments containing certain particles. Get respiratory protection against exposure to particles, dusts, and mists alongside protection against Hydrogen Fluoride gas up to 30 ppm and