This standard specifies a dedicated test method for determining the shear strength and shear modulus of rigid cellular plastics. Its core involves applying tensile or compressive loads to specimens bonded between metal loading blocks, subjecting the adhesive interface to shear forces until failure. To conduct tests in accordance with this standard, the essential testing instrument is a universal material testing machine capable of providing a constant displacement rate (e.g., 1 mm per minute). Additionally, to ensure precise alignment of the specimens and eliminate bending stresses, specialized alignment loading fixtures are typically required as supporting equipment.