Material Properties: Common plastic expansion anchors are typically made of polyethylene (PE) or polypropylene (PP). PE offers superior low-temperature resistance (retaining toughness at -70°C), while PP offers better high-temperature resistance (withstanding short-term heat up to 110°C). According to the GB/T 1040-2018 standard, the tensile strength must be ≥18 MPa for PE anchors and ≥25 MPa for PP anchors, catering to varying load-bearing requirements.
Dimensional Matching: Diameter and length directly affect load-bearing capacity. For instance, an M6 anchor (6 mm diameter) is suitable for hanging light objects weighing ≤5 kg, whereas an M10 anchor (10 mm diameter) can support loads up to 20 kg. The anchor length should ideally exceed the embedment depth by at least 10 mm to ensure full expansion.
Wall Type Compatibility: For hollow brick walls, select anchors with finer threading (e.g., 8 mm pitch), whereas concrete walls allow for anchors with coarser threading (12 mm pitch). Experimental data indicates that an incorrect choice can reduce load-bearing capacity by 30%–50% (refer to the *Technical Specification for Building Anchoring*, JGJ145-2013).
