Consolidation is one of the most delicate and decisive process to preserve any fabric. The addition of new sewed fabrics such as silk pongee to the original textiles is a common practice nowadays to consolidate, reinforce and compensate losses in historic textiles. Pongee is a plane weave silk used as reinforcement fabric due to its low density of the yarns in both the weft and warp direction that provides a considerable transparency as well. Results obtained from this research focus on the physic-chemical characterization of pongee. Data from specimens subjected to artificial accelerated ageing (dry and wet heat and UV radiation) are also shown. A multi-method approach is proposed combining microscopy (LM and SEM/EDX) and spectroscopy (reflectance, FTIR) techniques and traction tensile tests in order to characterize the overall behavior of the silk pongee before/after ageing processes. Tensile tests were run in weft and fill directions. Stress strain curves helped to determine the stiffness and flexibility of silk pongee as well as their elongation and strength to failure within specific environmental conditions. Comparison of Vis and IR spectra obtained in ATR mode from different areas of the pongee textile has evidenced that the yellowness and oxidation grades increase as follows: firstly UV radiation, secondly wet heat and finally dry heat. LM and SEM examination enabled the identification of empty fiber and microfissures in different areas on the surface. The measured mechanical properties are mainly focused on the maximum deformation and strength of samples prior to failure.