| 2.2.3.1. |
After the test of resistance to atmospheric agents, the outer face of the samples shall be free from cracks, scratches, chipping and deformation, and the mean variation in transmission Δt = (T2-T3)/T2, measured on the three samples according to the procedure described in Appendix 2 to this annex shall not exceed 0.020 (Δtm ≤ 0.020). |
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