This video presents a comprehensive evaluation of the heat-sealability of films developed from chañar brea gum (CBG), a biopolymer with potential for packaging applications. Heat sealability is a critical property in the packaging industry, as it directly determines the integrity and functionality of the final product. The video details how the films were prepared by the 10% casting method with the addition of glycerin, and how heat sealing was performed at 140 °C using a heat sealer. The video illustrates that heat sealing was performed on 2 cm × 10 cm strips of chañar brea gum in the horizontal (CBG-H) and vertical (CBG-V) directions. This video employs a joint determination to explore the fundamental properties of the films, including proximate analysis, antioxidant capacity, FTIR, DSC, TGA-DTGA, XRD, mechanical testing, water vapor permeability, sorption, and biodegradability. By integrating the results of all these determinations, the video seeks to evaluate and explain the “intimate relationships”—i.e., the complex interconnections among the molecular structure, composition, thermal behavior, mechanical properties, and barrier properties of chañar brea gum films—and how these fundamental properties dictate and control their heat sealability. The video shows that the thermal stability of CBG is up to 200 °C, with a melting point of 152.48 °C. The video further presents that the interstrand spacing was very similar at 4.88 nm for CBG and 4.66 nm for CBG-H. In the video, the SEM images of the heat seal show rounded shapes on the surface, while in the cross section, it is homogeneous and almost without gaps. The video highlights that the WVP decreased from 1.7 to 0.37 for CBG and CBG-H, respectively. The video also reports that the Young’s modulus decreased from 132 MPa for CBG to 96.5 MPa for CBG-H. The video reveals that the heat sealability is 656 N/m, with a biodegradability of 4 days. This comprehensive approach, as presented in the video, is crucial for optimizing the sealing process and designing functional and efficient biodegradable packages.