The objective of this study is to investigate the detrimental effects of a flexible linear shaped charge (FLSC) to variable thickness (3, 4 and 5 mm) Raex Ar 400 back plate and constant thickness (4.8 mm) Al-6061-T6 front plate due to varying backspace distance (0, 3, 6, 9, and 12 mm). A FLSC is used to cut both metallic and non-metallic material, quickly and efficiently. It is flexible and may be formed to produce cuts of many configurations, thereby making it particularly useful where more conventional cutting techniques are difficult to employ. While performing its function, the FLSC gives some damage to the back due to the high transient pressure and fragmentation effects. In order to decrease this damage, a steel plate is placed behind the FLSC.