Hot cold cycles are repeated fluctuations of temperature that can affect the performance and quality of a product over time. Hot cold cycles can cause thermal expansion and contraction, which can lead to cracking, warping, deformation, or failure of the product. Hot cold impact test chambers are instruments that create controlled hot and cold environments for testing the effects of temperature cycling on a product. They can measure the physical and chemical changes that occur in the product as it undergoes hot and cold cycles, such as tensile strength, elasticity, corrosion resistance, and color stability.