**2. Experimental procedures**

#### **2.1 Samples**

The materials studied were commercially available formulations obtained from one resin vendor. All formulations were identical except for PCR content as specified in **Table 1**. The samples were provided by the resin vendor in the form of ASTM D638 Type V Tensile Bars.

After clearly marking the samples and dimensional measurement (width and thickness), they were divided into 7 different groups (**Table 2**) with each group having 5 ASTM tensile bars of virgin PC, 50% and 75%.
