Office Chair Base Cracking

The repair of a cracked office chair base requires selecting the appropriate method based on the material, as detailed below:

1. Plastic Base Repair
   Cracks in plastic bases often result from material aging or uneven long-term stress. To repair, first clean the crack surface to remove dust, oil, and other impurities, ensuring the bonding surface is dry and clean. Apply AB glue (epoxy resin glue) to the crack; after curing, it offers high strength and impact resistance, effectively sealing the crack and restoring structural stability. To enhance the impact resistance of the repaired area, attach a metal sheet (such as an aluminum alloy sheet) or carbon fiber cloth to the crack while the glue is not fully cured. The metal sheet should be cut slightly larger than the crack size and tightly bonded to the base with glue; the carbon fiber cloth should be fully saturated with glue and then covered over the crack to form a composite reinforcement layer. After repair, let it sit for more than 24 hours until the glue is fully cured before use.

2. Wooden Base Repair
   Cracks in wooden bases are usually related to material moisture absorption and expansion, drying shrinkage, or long-term weight bearing. If the crack is large or the structure is severely damaged, direct repair may not guarantee strength, and it is recommended to replace it with a metal square tube of the same size. Metal square tubes (such as aluminum alloy or steel) offer higher load-bearing capacity and deformation resistance, effectively preventing repeated cracking. To replace, first disassemble the original wooden base, measure its length, width, and mounting hole positions, select a matching metal square tube, and secure it to the corresponding position on the chair frame with screws or welding to ensure a stable installation.

3. General Repair Recommendations
   If the base material is unknown or the damage is minor, first measure the original base dimensions (including length, width, thickness, and mounting hole spacing) and purchase a replacement base of the same model. Follow the installation instructions step by step during replacement, ensuring screws are tightened and hole positions are aligned to avoid secondary damage due to improper installation. Additionally, an office chair seat repeated impact tester can simulate real-life repeated sitting conditions to conduct long-term cyclic impact tests on the base, identifying potential issues such as fractures in advance and extending its service life. During daily use, avoid keeping the chair in a humid environment or overloading it, and regularly check if the base connection parts are loose to reduce the risk of cracking.