在研制低摩擦系数合成闸瓦的过程中,出现了一个普遍性的问题,即由于合成闸瓦对车轮热影响所造成的踏面热裂纹。这种裂纹的发生,严重影响了合成闸瓦的推广运用。我们联合试制组经过一年多的共同努力,在42号、59—11号和75号配方的基础上,吸取国内外的经验,于1977年研制了183号低弹模闸瓦。该闸瓦经铁道科学研究院1:1试验台测试表明, In the process of developing brake shoes with low coefficient of friction, a common problem has arisen, namely the hot cracking of the tread caused by the thermal shock of the brake shoe on the wheels. The occurrence of such cracks has seriously affected the promotion of the use of synthetic brake shoes. After more than a year’s joint efforts, our joint trial production team learned from domestic and foreign experiences on the basis of the formulations No. 42, No. 59-11 and No. 75 and developed the No.307 low sluice brake shoe in 1977. The brake shoe by the Institute of Railways 1: 1 test bench tests show that,