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 , measured on the three samples according to the procedure described in Appendix 2 to this annex shall not exceed 0.020 (∆dm &lt; = 0.020).
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 , measured on the three samples according to the procedure described in Appendix 2 to this annex shall not exceed 0.020 (∆dm &lt; = 0.020).