Abstract: The WJ-8 type fastening system is mainly used for high-speed railway tracks， and the gauge baffle is an important component of the WJ-8 type fastening system. This gauge baffle plays an important role in transmitting loads， maintaining and adjusting the gauge of two rails， and it also has a certain insulation in the fastening system. At present， the gauge baffle is produced using an ordinary injection molding technology， which makes the product prone to shrinkage， and the elastic strip buckle is prone to crushing during use. This article mainly optimized the structure of the gauge baffle and produced the corresponding products by selecting suitable foaming agents for tests to meet the performance requirements. The problems of shrinkage and pressure feedback at the clamping point of the track gauge baffle product was solved. This study provides an important reference for better engineering applications in the future.

Key words: gauge apron, insulation, microfoam