Silicone rubber sealing strips are currently widely used as sealing materials for the installation of glass and the frames of doors and windows made of steel, aluminum alloy, and plastic. Silicone rubber sealing strips are typically made from modified polyvinyl chloride (PVC). The performance of silicone rubber sealing strips significantly affects the airtightness, water tightness, heat loss, and other important performance indicators of building doors and windows, as well as the durability of the doors and windows. Therefore, the state has long established the national standard GB12002-89 "Silicone Rubber Sealing Strips for Plastic Doors and Windows" to regulate the production and testing of silicone rubber sealing strips. Hebei Xianghe (www.hebeixh.com). However, the quality and price of silicone rubber sealing strips for doors and windows in the current construction materials market are quite chaotic. Prices range from 15,000 to 16,000 yuan per ton for expensive options, while cheaper ones are only 6,000 yuan per ton. The price difference is nearly 10,000 yuan, and the quality varies greatly, leaving consumers at a loss. Many manufacturers of silicone rubber sealing strips claim that their products comply with the national standard GB12002-89 and can provide qualified testing reports from institutions. Based on tests conducted on currently used silicone rubber sealing strips from various manufacturers and samples sent by relevant manufacturers, the results of the heating weight loss index in the thermal air aging performance project are shocking: none of the more than ten samples were qualified. According to the regulations of GB12002-89, the heating weight loss index for silicone rubber sealing strips in the thermal air aging performance project should be ≤3%. However, the actual test results showed a heating weight loss of between 7.17% and 22.54%, far exceeding the limits set by the national standard.