| 2.2.3.2. | After the test of resistance to chemical agents, the samples shall not bear any traces of chemical staining likely to cause a variation of flux diffusion, whose mean variation Δd = (T5-T4)/T2, measured on the three samples according to the procedure described in Appendix 2 to this annex shall not exceed 0.020 (Δdm < 0.020). | a0c0 |