蛭石又称膨胀蛭石。由于其容重小,导热系数低,是一种很好的轻质耐火材料,具有良好保温性能。我们以蛭石为基材,分别用水玻璃、合脂、水泥、石膏和树脂作粘结剂制造保温冒口。用铝、镁合金进行了浇注试验,收到了一定效果。试验表明:蛭石保温冒口比普通冒口有较好保温性能,可提高冒口补缩能力,提高铸件合格率,特别是减少因冒口补缩不良而造成的 Vermiculite, also known as expanded vermiculite. Due to its small capacity, low thermal conductivity, is a good lightweight refractory material, with good insulation properties. We vermiculite as the substrate, respectively, water glass, grease, cement, plaster and resin as a binder for thermal insulation riser. With aluminum, magnesium alloy pouring test, received a certain effect. The test shows that the vermiculite thermal riser has better thermal insulation performance than ordinary riser, which can increase the ability of riser to replenish and increase the qualified rate of castings, in particular, reduce the defects caused by poor feeding riser