ASTM B117-19 pdf free.Standard Practice for Operating Salt Spray (Fog) Apparatus. ASTM B117 covers the apparatus, procedure, and conditions required to create and maintain the salt spray (fog) test environment. Suitable apparatus which may be used is described in Appendix X1. 4. Apparatus 4.1 The apparatus required for salt spray (fog) exposure consists of a fog chamber, a salt solution...