Repair of the rebound gap problem caused by over-stretching of the insulating glass warm edge strips

Excessive stretching or forceful pulling during the cutting, bending, and splicing of warm-edge spacers can induce residual deformation stress; following assembly and setting, the material gradually rebounds and contracts, resulting in minute gaps at the joints.

Due to the high toughness and strong elastic recovery of warm-edge materials, they tend to retract toward their original shape after being stretched by external force. This causes joint gaps to widen over time, creating pathways for air and moisture infiltration. This issue often remains latent-showing no abnormalities upon factory release-only to manifest as corner fogging and seal failure after several months of use. Remediation requires dismantling the defective unit, replacing the deformed spacer, and strictly adhering to proper bending and splicing procedures-specifically prohibiting the forceful pulling of the profile. After splicing, the spacer should be allowed to rest to relieve stress before the unit is assembled and compressed. Precise control of handling force is essential to ensure the spacer fits naturally without stretching or deformation, thereby eliminating the risk of rebound-induced gaps at the source.