Class 4 (Flammable Solids) and Class 5 (Oxidizers) must be kept:

Dry. Section 9.4 (Class 4 & 5): Class 4 and 5 materials, which become unstable and dangerous when wet, must be kept dry while in transit.

Class 4 (Flammable Solids) and Class 5 (Oxidizers) must be kept:

ANSWER BREAKDOWN
  • A. Incorrect. "Wet" is not correct. Section 9.4 (Class 4 & 5): Class 4 and 5 materials, which become unstable and dangerous when wet, must be kept dry while in transit.
  • B. Correct. Section 9.4 (Class 4 & 5): Class 4 and 5 materials, which become unstable and dangerous when wet, must be kept dry while in transit.
  • C. Incorrect. "Cold" is not correct. Section 9.4 (Class 4 & 5): Class 4 and 5 materials, which become unstable and dangerous when wet, must be kept dry while in transit.
  • D. Incorrect. "In the light" is not correct. Section 9.4 (Class 4 & 5): Class 4 and 5 materials, which become unstable and dangerous when wet, must be kept dry while in transit.